/**
 * WordPress Administration Navigation Menu
 * Interface JS functions
 *
 * @version 2.0.0
 *
 * @package WordPress
 * @subpackage Administration
 * @output wp-admin/js/nav-menu.js
 */

/* global menus, postboxes, columns, isRtl, ajaxurl, wpNavMenu */

(function($) {

var api;

/**
* Contains all the functions to handle WordPress navigation menus administration.
*
* @namespace wpNavMenu
*/
api = window.wpNavMenu = {

options : {
menuItemDepthPerLevel : 30, // Do not use directly. Use depthToPx and pxToDepth instead.
globalMaxDepth:  11,
sortableItems:   '> *',
targetTolerance: 0
},

menuList : undefined, // Set in init.
targetList : undefined, // Set in init.
menusChanged : false,
isRTL: !! ( 'undefined' != typeof isRtl && isRtl ),
negateIfRTL: ( 'undefined' != typeof isRtl && isRtl ) ? -1 : 1,
lastSearch: '',

// Functions that run on init.
init : function() {
api.menuList = $('#menu-to-edit');
api.targetList = api.menuList;

this.jQueryExtensions();

this.attachMenuEditListeners();

this.attachBulkSelectButtonListeners();
this.attachMenuCheckBoxListeners();
this.attachMenuItemDeleteButton();
this.attachPendingMenuItemsListForDeletion();

this.attachQuickSearchListeners();
this.attachThemeLocationsListeners();
this.attachMenuSaveSubmitListeners();

this.attachTabsPanelListeners();

this.attachUnsavedChangesListener();

if ( api.menuList.length )
this.initSortables();

if ( menus.oneThemeLocationNoMenus )
$( '#posttype-page' ).addSelectedToMenu( api.addMenuItemToBottom );

this.initManageLocations();

this.initAccessibility();

this.initToggles();

this.initPreviewing();
},

jQueryExtensions : function() {
// jQuery extensions.
$.fn.extend({
menuItemDepth : function() {
var margin = api.isRTL ? this.eq(0).css('margin-right') : this.eq(0).css('margin-left');
return api.pxToDepth( margin && -1 != margin.indexOf('px') ? margin.slice(0, -2) : 0 );
},
updateDepthClass : function(current, prev) {
return this.each(function(){
var t = $(this);
prev = prev || t.menuItemDepth();
$(this).removeClass('menu-item-depth-'+ prev )
.addClass('menu-item-depth-'+ current );
});
},
shiftDepthClass : function(change) {
return this.each(function(){
var t = $(this),
depth = t.menuItemDepth(),
newDepth = depth + change;

t.removeClass( 'menu-item-depth-'+ depth )
.addClass( 'menu-item-depth-'+ ( newDepth ) );

if ( 0 === newDepth ) {
t.find( '.is-submenu' ).hide();
}
});
},
childMenuItems : function() {
var result = $();
this.each(function(){
var t = $(this), depth = t.menuItemDepth(), next = t.next( '.menu-item' );
while( next.length && next.menuItemDepth() > depth ) {
result = result.add( next );
next = next.next( '.menu-item' );
}
});
return result;
},
shiftHorizontally : function( dir ) {
return this.each(function(){
var t = $(this),
depth = t.menuItemDepth(),
newDepth = depth + dir;

// Change .menu-item-depth-n class.
t.moveHorizontally( newDepth, depth );
});
},
moveHorizontally : function( newDepth, depth ) {
return this.each(function(){
var t = $(this),
children = t.childMenuItems(),
diff = newDepth - depth,
subItemText = t.find('.is-submenu');

// Change .menu-item-depth-n class.
t.updateDepthClass( newDepth, depth ).updateParentMenuItemDBId();

// If it has children, move those too.
if ( children ) {
children.each(function() {
var t = $(this),
thisDepth = t.menuItemDepth(),
newDepth = thisDepth + diff;
t.updateDepthClass(newDepth, thisDepth).updateParentMenuItemDBId();
});
}

// Show "Sub item" helper text.
if (0 === newDepth)
subItemText.hide();
else
subItemText.show();
});
},
updateParentMenuItemDBId : function() {
return this.each(function(){
var item = $(this),
input = item.find( '.menu-item-data-parent-id' ),
depth = parseInt( item.menuItemDepth(), 10 ),
parentDepth = depth - 1,
parent = item.prevAll( '.menu-item-depth-' + parentDepth ).first();

if ( 0 === depth ) { // Item is on the top level, has no parent.
input.val(0);
} else { // Find the parent item, and retrieve its object id.
input.val( parent.find( '.menu-item-data-db-id' ).val() );
}
});
},
hideAdvancedMenuItemFields : function() {
return this.each(function(){
var that = $(this);
$('.hide-column-tog').not(':checked').each(function(){
that.find('.field-' + $(this).val() ).addClass('hidden-field');
});
});
},
/**
* Adds selected menu items to the menu.
*
* @ignore
*
* @param jQuery metabox The metabox jQuery object.
*/
addSelectedToMenu : function(processMethod) {
if ( 0 === $('#menu-to-edit').length ) {
return false;
}

return this.each(function() {
var t = $(this), menuItems = {},
checkboxes = ( menus.oneThemeLocationNoMenus && 0 === t.find( '.tabs-panel-active .categorychecklist li input:checked' ).length ) ? t.find( '#page-all li input[type="checkbox"]' ) : t.find( '.tabs-panel-active .categorychecklist li input:checked' ),
re = /menu-item\[([^\]]*)/;

processMethod = processMethod || api.addMenuItemToBottom;

// If no items are checked, bail.
if ( !checkboxes.length )
return false;

// Show the Ajax spinner.
t.find( '.button-controls .spinner' ).addClass( 'is-active' );

// Retrieve menu item data.
$(checkboxes).each(function(){
var t = $(this),
listItemDBIDMatch = re.exec( t.attr('name') ),
listItemDBID = 'undefined' == typeof listItemDBIDMatch[1] ? 0 : parseInt(listItemDBIDMatch[1], 10);

if ( this.className && -1 != this.className.indexOf('add-to-top') )
processMethod = api.addMenuItemToTop;
menuItems[listItemDBID] = t.closest('li').getItemData( 'add-menu-item', listItemDBID );
});

// Add the items.
api.addItemToMenu(menuItems, processMethod, function(){
// Deselect the items and hide the Ajax spinner.
checkboxes.prop( 'checked', false );
t.find( '.button-controls .select-all' ).prop( 'checked', false );
t.find( '.button-controls .spinner' ).removeClass( 'is-active' );
});
});
},
getItemData : function( itemType, id ) {
itemType = itemType || 'menu-item';

var itemData = {}, i,
fields = [
'menu-item-db-id',
'menu-item-object-id',
'menu-item-object',
'menu-item-parent-id',
'menu-item-position',
'menu-item-type',
'menu-item-title',
'menu-item-url',
'menu-item-description',
'menu-item-attr-title',
'menu-item-target',
'menu-item-classes',
'menu-item-xfn'
];

if( !id && itemType == 'menu-item' ) {
id = this.find('.menu-item-data-db-id').val();
}

if( !id ) return itemData;

this.find('input').each(function() {
var field;
i = fields.length;
while ( i-- ) {
if( itemType == 'menu-item' )
field = fields[i] + '[' + id + ']';
else if( itemType == 'add-menu-item' )
field = 'menu-item[' + id + '][' + fields[i] + ']';

if (
this.name &&
field == this.name
) {
itemData[fields[i]] = this.value;
}
}
});

return itemData;
},
setItemData : function( itemData, itemType, id ) { // Can take a type, such as 'menu-item', or an id.
itemType = itemType || 'menu-item';

if( !id && itemType == 'menu-item' ) {
id = $('.menu-item-data-db-id', this).val();
}

if( !id ) return this;

this.find('input').each(function() {
var t = $(this), field;
$.each( itemData, function( attr, val ) {
if( itemType == 'menu-item' )
field = attr + '[' + id + ']';
else if( itemType == 'add-menu-item' )
field = 'menu-item[' + id + '][' + attr + ']';

if ( field == t.attr('name') ) {
t.val( val );
}
});
});
return this;
}
});
},

countMenuItems : function( depth ) {
return $( '.menu-item-depth-' + depth ).length;
},

moveMenuItem : function( $this, dir ) {

var items, newItemPosition, newDepth,
menuItems = $( '#menu-to-edit li' ),
menuItemsCount = menuItems.length,
thisItem = $this.parents( 'li.menu-item' ),
thisItemChildren = thisItem.childMenuItems(),
thisItemData = thisItem.getItemData(),
thisItemDepth = parseInt( thisItem.menuItemDepth(), 10 ),
thisItemPosition = parseInt( thisItem.index(), 10 ),
nextItem = thisItem.next(),
nextItemChildren = nextItem.childMenuItems(),
nextItemDepth = parseInt( nextItem.menuItemDepth(), 10 ) + 1,
prevItem = thisItem.prev(),
prevItemDepth = parseInt( prevItem.menuItemDepth(), 10 ),
prevItemId = prevItem.getItemData()['menu-item-db-id'],
a11ySpeech = menus[ 'moved' + dir.charAt(0).toUpperCase() + dir.slice(1) ];

switch ( dir ) {
case 'up':
newItemPosition = thisItemPosition - 1;

// Already at top.
if ( 0 === thisItemPosition )
break;

// If a sub item is moved to top, shift it to 0 depth.
if ( 0 === newItemPosition && 0 !== thisItemDepth )
thisItem.moveHorizontally( 0, thisItemDepth );

// If prev item is sub item, shift to match depth.
if ( 0 !== prevItemDepth )
thisItem.moveHorizontally( prevItemDepth, thisItemDepth );

// Does this item have sub items?
if ( thisItemChildren ) {
items = thisItem.add( thisItemChildren );
// Move the entire block.
items.detach().insertBefore( menuItems.eq( newItemPosition ) ).updateParentMenuItemDBId();
} else {
thisItem.detach().insertBefore( menuItems.eq( newItemPosition ) ).updateParentMenuItemDBId();
}
break;
case 'down':
// Does this item have sub items?
if ( thisItemChildren ) {
items = thisItem.add( thisItemChildren ),
nextItem = menuItems.eq( items.length + thisItemPosition ),
nextItemChildren = 0 !== nextItem.childMenuItems().length;

if ( nextItemChildren ) {
newDepth = parseInt( nextItem.menuItemDepth(), 10 ) + 1;
thisItem.moveHorizontally( newDepth, thisItemDepth );
}

// Have we reached the bottom?
if ( menuItemsCount === thisItemPosition + items.length )
break;

items.detach().insertAfter( menuItems.eq( thisItemPosition + items.length ) ).updateParentMenuItemDBId();
} else {
// If next item has sub items, shift depth.
if ( 0 !== nextItemChildren.length )
thisItem.moveHorizontally( nextItemDepth, thisItemDepth );

// Have we reached the bottom?
if ( menuItemsCount === thisItemPosition + 1 )
break;
thisItem.detach().insertAfter( menuItems.eq( thisItemPosition + 1 ) ).updateParentMenuItemDBId();
}
break;
case 'top':
// Already at top.
if ( 0 === thisItemPosition )
break;
// Does this item have sub items?
if ( thisItemChildren ) {
items = thisItem.add( thisItemChildren );
// Move the entire block.
items.detach().insertBefore( menuItems.eq( 0 ) ).updateParentMenuItemDBId();
} else {
thisItem.detach().insertBefore( menuItems.eq( 0 ) ).updateParentMenuItemDBId();
}
break;
case 'left':
// As far left as possible.
if ( 0 === thisItemDepth )
break;
thisItem.shiftHorizontally( -1 );
break;
case 'right':
// Can't be sub item at top.
if ( 0 === thisItemPosition )
break;
// Already sub item of prevItem.
if ( thisItemData['menu-item-parent-id'] === prevItemId )
break;
thisItem.shiftHorizontally( 1 );
break;
}
$this.trigger( 'focus' );
api.registerChange();
api.refreshKeyboardAccessibility();
api.refreshAdvancedAccessibility();

if ( a11ySpeech ) {
wp.a11y.speak( a11ySpeech );
}
},

initAccessibility : function() {
var menu = $( '#menu-to-edit' );

api.refreshKeyboardAccessibility();
api.refreshAdvancedAccessibility();

// Refresh the accessibility when the user comes close to the item in any way.
menu.on( 'mouseenter.refreshAccessibility focus.refreshAccessibility touchstart.refreshAccessibility' , '.menu-item' , function(){
api.refreshAdvancedAccessibilityOfItem( $( this ).find( 'a.item-edit' ) );
} );

// We have to update on click as well because we might hover first, change the item, and then click.
menu.on( 'click', 'a.item-edit', function() {
api.refreshAdvancedAccessibilityOfItem( $( this ) );
} );

// Links for moving items.
menu.on( 'click', '.menus-move', function () {
var $this = $( this ),
dir = $this.data( 'dir' );

if ( 'undefined' !== typeof dir ) {
api.moveMenuItem( $( this ).parents( 'li.menu-item' ).find( 'a.item-edit' ), dir );
}
});
},

/**
* refreshAdvancedAccessibilityOfItem( [itemToRefresh] )
*
* Refreshes advanced accessibility buttons for one menu item.
* Shows or hides buttons based on the location of the menu item.
*
* @param {Object} itemToRefresh The menu item that might need its advanced accessibility buttons refreshed
*/
refreshAdvancedAccessibilityOfItem : function( itemToRefresh ) {

// Only refresh accessibility when necessary.
if ( true !== $( itemToRefresh ).data( 'needs_accessibility_refresh' ) ) {
return;
}

var thisLink, thisLinkText, primaryItems, itemPosition, title,
parentItem, parentItemId, parentItemName, subItems,
$this = $( itemToRefresh ),
menuItem = $this.closest( 'li.menu-item' ).first(),
depth = menuItem.menuItemDepth(),
isPrimaryMenuItem = ( 0 === depth ),
itemName = $this.closest( '.menu-item-handle' ).find( '.menu-item-title' ).text(),
position = parseInt( menuItem.index(), 10 ),
prevItemDepth = ( isPrimaryMenuItem ) ? depth : parseInt( depth - 1, 10 ),
prevItemNameLeft = menuItem.prevAll('.menu-item-depth-' + prevItemDepth).first().find( '.menu-item-title' ).text(),
prevItemNameRight = menuItem.prevAll('.menu-item-depth-' + depth).first().find( '.menu-item-title' ).text(),
totalMenuItems = $('#menu-to-edit li').length,
hasSameDepthSibling = menuItem.nextAll( '.menu-item-depth-' + depth ).length;

menuItem.find( '.field-move' ).toggle( totalMenuItems > 1 );

// Where can they move this menu item?
if ( 0 !== position ) {
thisLink = menuItem.find( '.menus-move-up' );
thisLink.attr( 'aria-label', menus.moveUp ).css( 'display', 'inline' );
}

if ( 0 !== position && isPrimaryMenuItem ) {
thisLink = menuItem.find( '.menus-move-top' );
thisLink.attr( 'aria-label', menus.moveToTop ).css( 'display', 'inline' );
}

if ( position + 1 !== totalMenuItems && 0 !== position ) {
thisLink = menuItem.find( '.menus-move-down' );
thisLink.attr( 'aria-label', menus.moveDown ).css( 'display', 'inline' );
}

if ( 0 === position && 0 !== hasSameDepthSibling ) {
thisLink = menuItem.find( '.menus-move-down' );
thisLink.attr( 'aria-label', menus.moveDown ).css( 'display', 'inline' );
}

if ( ! isPrimaryMenuItem ) {
thisLink = menuItem.find( '.menus-move-left' ),
thisLinkText = menus.outFrom.replace( '%s', prevItemNameLeft );
thisLink.attr( 'aria-label', menus.moveOutFrom.replace( '%s', prevItemNameLeft ) ).text( thisLinkText ).css( 'display', 'inline' );
}

if ( 0 !== position ) {
if ( menuItem.find( '.menu-item-data-parent-id' ).val() !== menuItem.prev().find( '.menu-item-data-db-id' ).val() ) {
thisLink = menuItem.find( '.menus-move-right' ),
thisLinkText = menus.under.replace( '%s', prevItemNameRight );
thisLink.attr( 'aria-label', menus.moveUnder.replace( '%s', prevItemNameRight ) ).text( thisLinkText ).css( 'display', 'inline' );
}
}

if ( isPrimaryMenuItem ) {
primaryItems = $( '.menu-item-depth-0' ),
itemPosition = primaryItems.index( menuItem ) + 1,
totalMenuItems = primaryItems.length,

// String together help text for primary menu items.
title = menus.menuFocus.replace( '%1$s', itemName ).replace( '%2$d', itemPosition ).replace( '%3$d', totalMenuItems );
} else {
parentItem = menuItem.prevAll( '.menu-item-depth-' + parseInt( depth - 1, 10 ) ).first(),
parentItemId = parentItem.find( '.menu-item-data-db-id' ).val(),
parentItemName = parentItem.find( '.menu-item-title' ).text(),
subItems = $( '.menu-item .menu-item-data-parent-id[value="' + parentItemId + '"]' ),
itemPosition = $( subItems.parents('.menu-item').get().reverse() ).index( menuItem ) + 1;

// String together help text for sub menu items.
title = menus.subMenuFocus.replace( '%1$s', itemName ).replace( '%2$d', itemPosition ).replace( '%3$s', parentItemName );
}

$this.attr( 'aria-label', title );

// Mark this item's accessibility as refreshed.
$this.data( 'needs_accessibility_refresh', false );
},

/**
* refreshAdvancedAccessibility
*
* Hides all advanced accessibility buttons and marks them for refreshing.
*/
refreshAdvancedAccessibility : function() {

// Hide all the move buttons by default.
$( '.menu-item-settings .field-move .menus-move' ).hide();

// Mark all menu items as unprocessed.
$( 'a.item-edit' ).data( 'needs_accessibility_refresh', true );

// All open items have to be refreshed or they will show no links.
$( '.menu-item-edit-active a.item-edit' ).each( function() {
api.refreshAdvancedAccessibilityOfItem( this );
} );
},

refreshKeyboardAccessibility : function() {
$( 'a.item-edit' ).off( 'focus' ).on( 'focus', function(){
$(this).off( 'keydown' ).on( 'keydown', function(e){

var arrows,
$this = $( this ),
thisItem = $this.parents( 'li.menu-item' ),
thisItemData = thisItem.getItemData();

// Bail if it's not an arrow key.
if ( 37 != e.which && 38 != e.which && 39 != e.which && 40 != e.which )
return;

// Avoid multiple keydown events.
$this.off('keydown');

// Bail if there is only one menu item.
if ( 1 === $('#menu-to-edit li').length )
return;

// If RTL, swap left/right arrows.
arrows = { '38': 'up', '40': 'down', '37': 'left', '39': 'right' };
if ( $('body').hasClass('rtl') )
arrows = { '38' : 'up', '40' : 'down', '39' : 'left', '37' : 'right' };

switch ( arrows[e.which] ) {
case 'up':
api.moveMenuItem( $this, 'up' );
break;
case 'down':
api.moveMenuItem( $this, 'down' );
break;
case 'left':
api.moveMenuItem( $this, 'left' );
break;
case 'right':
api.moveMenuItem( $this, 'right' );
break;
}
// Put focus back on same menu item.
$( '#edit-' + thisItemData['menu-item-db-id'] ).trigger( 'focus' );
return false;
});
});
},

initPreviewing : function() {
// Update the item handle title when the navigation label is changed.
$( '#menu-to-edit' ).on( 'change input', '.edit-menu-item-title', function(e) {
var input = $( e.currentTarget ), title, titleEl;
title = input.val();
titleEl = input.closest( '.menu-item' ).find( '.menu-item-title' );
// Don't update to empty title.
if ( title ) {
titleEl.text( title ).removeClass( 'no-title' );
} else {
titleEl.text( wp.i18n._x( '(no label)', 'missing menu item navigation label' ) ).addClass( 'no-title' );
}
} );
},

initToggles : function() {
// Init postboxes.
postboxes.add_postbox_toggles('nav-menus');

// Adjust columns functions for menus UI.
columns.useCheckboxesForHidden();
columns.checked = function(field) {
$('.field-' + field).removeClass('hidden-field');
};
columns.unchecked = function(field) {
$('.field-' + field).addClass('hidden-field');
};
// Hide fields.
api.menuList.hideAdvancedMenuItemFields();

$('.hide-postbox-tog').on( 'click', function () {
var hidden = $( '.accordion-container li.accordion-section' ).filter(':hidden').map(function() { return this.id; }).get().join(',');
$.post(ajaxurl, {
action: 'closed-postboxes',
hidden: hidden,
closedpostboxesnonce: jQuery('#closedpostboxesnonce').val(),
page: 'nav-menus'
});
});
},

initSortables : function() {
var currentDepth = 0, originalDepth, minDepth, maxDepth,
prev, next, prevBottom, nextThreshold, helperHeight, transport,
menuEdge = api.menuList.offset().left,
body = $('body'), maxChildDepth,
menuMaxDepth = initialMenuMaxDepth();

if( 0 !== $( '#menu-to-edit li' ).length )
$( '.drag-instructions' ).show();

// Use the right edge if RTL.
menuEdge += api.isRTL ? api.menuList.width() : 0;

api.menuList.sortable({
handle: '.menu-item-handle',
placeholder: 'sortable-placeholder',
items: api.options.sortableItems,
start: function(e, ui) {
var height, width, parent, children, tempHolder;

// Handle placement for RTL orientation.
if ( api.isRTL )
ui.item[0].style.right = 'auto';

transport = ui.item.children('.menu-item-transport');

// Set depths. currentDepth must be set before children are located.
originalDepth = ui.item.menuItemDepth();
updateCurrentDepth(ui, originalDepth);

// Attach child elements to parent.
// Skip the placeholder.
parent = ( ui.item.next()[0] == ui.placeholder[0] ) ? ui.item.next() : ui.item;
children = parent.childMenuItems();
transport.append( children );

// Update the height of the placeholder to match the moving item.
height = transport.outerHeight();
// If there are children, account for distance between top of children and parent.
height += ( height > 0 ) ? (ui.placeholder.css('margin-top').slice(0, -2) * 1) : 0;
height += ui.helper.outerHeight();
helperHeight = height;
height -= 2;                                              // Subtract 2 for borders.
ui.placeholder.height(height);

// Update the width of the placeholder to match the moving item.
maxChildDepth = originalDepth;
children.each(function(){
var depth = $(this).menuItemDepth();
maxChildDepth = (depth > maxChildDepth) ? depth : maxChildDepth;
});
width = ui.helper.find('.menu-item-handle').outerWidth(); // Get original width.
width += api.depthToPx(maxChildDepth - originalDepth);    // Account for children.
width -= 2;                                               // Subtract 2 for borders.
ui.placeholder.width(width);

// Update the list of menu items.
tempHolder = ui.placeholder.next( '.menu-item' );
tempHolder.css( 'margin-top', helperHeight + 'px' ); // Set the margin to absorb the placeholder.
ui.placeholder.detach();         // Detach or jQuery UI will think the placeholder is a menu item.
$(this).sortable( 'refresh' );   // The children aren't sortable. We should let jQuery UI know.
ui.item.after( ui.placeholder ); // Reattach the placeholder.
tempHolder.css('margin-top', 0); // Reset the margin.

// Now that the element is complete, we can update...
updateSharedVars(ui);
},
stop: function(e, ui) {
var children, subMenuTitle,
depthChange = currentDepth - originalDepth;

// Return child elements to the list.
children = transport.children().insertAfter(ui.item);

// Add "sub menu" description.
subMenuTitle = ui.item.find( '.item-title .is-submenu' );
if ( 0 < currentDepth )
subMenuTitle.show();
else
subMenuTitle.hide();

// Update depth classes.
if ( 0 !== depthChange ) {
ui.item.updateDepthClass( currentDepth );
children.shiftDepthClass( depthChange );
updateMenuMaxDepth( depthChange );
}
// Register a change.
api.registerChange();
// Update the item data.
ui.item.updateParentMenuItemDBId();

// Address sortable's incorrectly-calculated top in Opera.
ui.item[0].style.top = 0;

// Handle drop placement for rtl orientation.
if ( api.isRTL ) {
ui.item[0].style.left = 'auto';
ui.item[0].style.right = 0;
}

api.refreshKeyboardAccessibility();
api.refreshAdvancedAccessibility();
},
change: function(e, ui) {
// Make sure the placeholder is inside the menu.
// Otherwise fix it, or we're in trouble.
if( ! ui.placeholder.parent().hasClass('menu') )
(prev.length) ? prev.after( ui.placeholder ) : api.menuList.prepend( ui.placeholder );

updateSharedVars(ui);
},
sort: function(e, ui) {
var offset = ui.helper.offset(),
edge = api.isRTL ? offset.left + ui.helper.width() : offset.left,
depth = api.negateIfRTL * api.pxToDepth( edge - menuEdge );

/*
* Check and correct if depth is not within range.
* Also, if the dragged element is dragged upwards over an item,
* shift the placeholder to a child position.
*/
if ( depth > maxDepth || offset.top < ( prevBottom - api.options.targetTolerance ) ) {
depth = maxDepth;
} else if ( depth < minDepth ) {
depth = minDepth;
}

if( depth != currentDepth )
updateCurrentDepth(ui, depth);

// If we overlap the next element, manually shift downwards.
if( nextThreshold && offset.top + helperHeight > nextThreshold ) {
next.after( ui.placeholder );
updateSharedVars( ui );
$( this ).sortable( 'refreshPositions' );
}
}
});

function updateSharedVars(ui) {
var depth;

prev = ui.placeholder.prev( '.menu-item' );
next = ui.placeholder.next( '.menu-item' );

// Make sure we don't select the moving item.
if( prev[0] == ui.item[0] ) prev = prev.prev( '.menu-item' );
if( next[0] == ui.item[0] ) next = next.next( '.menu-item' );

prevBottom = (prev.length) ? prev.offset().top + prev.height() : 0;
nextThreshold = (next.length) ? next.offset().top + next.height() / 3 : 0;
minDepth = (next.length) ? next.menuItemDepth() : 0;

if( prev.length )
maxDepth = ( (depth = prev.menuItemDepth() + 1) > api.options.globalMaxDepth ) ? api.options.globalMaxDepth : depth;
else
maxDepth = 0;
}

function updateCurrentDepth(ui, depth) {
ui.placeholder.updateDepthClass( depth, currentDepth );
currentDepth = depth;
}

function initialMenuMaxDepth() {
if( ! body[0].className ) return 0;
var match = body[0].className.match(/menu-max-depth-(\d+)/);
return match && match[1] ? parseInt( match[1], 10 ) : 0;
}

function updateMenuMaxDepth( depthChange ) {
var depth, newDepth = menuMaxDepth;
if ( depthChange === 0 ) {
return;
} else if ( depthChange > 0 ) {
depth = maxChildDepth + depthChange;
if( depth > menuMaxDepth )
newDepth = depth;
} else if ( depthChange < 0 && maxChildDepth == menuMaxDepth ) {
while( ! $('.menu-item-depth-' + newDepth, api.menuList).length && newDepth > 0 )
newDepth--;
}
// Update the depth class.
body.removeClass( 'menu-max-depth-' + menuMaxDepth ).addClass( 'menu-max-depth-' + newDepth );
menuMaxDepth = newDepth;
}
},

initManageLocations : function () {
$('#menu-locations-wrap form').on( 'submit', function(){
window.onbeforeunload = null;
});
$('.menu-location-menus select').on('change', function () {
var editLink = $(this).closest('tr').find('.locations-edit-menu-link');
if ($(this).find('option:selected').data('orig'))
editLink.show();
else
editLink.hide();
});
},

attachMenuEditListeners : function() {
var that = this;
$('#update-nav-menu').on('click', function(e) {
if ( e.target && e.target.className ) {
if ( -1 != e.target.className.indexOf('item-edit') ) {
return that.eventOnClickEditLink(e.target);
} else if ( -1 != e.target.className.indexOf('menu-save') ) {
return that.eventOnClickMenuSave(e.target);
} else if ( -1 != e.target.className.indexOf('menu-delete') ) {
return that.eventOnClickMenuDelete(e.target);
} else if ( -1 != e.target.className.indexOf('item-delete') ) {
return that.eventOnClickMenuItemDelete(e.target);
} else if ( -1 != e.target.className.indexOf('item-cancel') ) {
return that.eventOnClickCancelLink(e.target);
}
}
});

$( '#menu-name' ).on( 'input', _.debounce( function () {
var menuName = $( document.getElementById( 'menu-name' ) ),
menuNameVal = menuName.val();

if ( ! menuNameVal || ! menuNameVal.replace( /\s+/, '' ) ) {
// Add warning for invalid menu name.
menuName.parent().addClass( 'form-invalid' );
} else {
// Remove warning for valid menu name.
menuName.parent().removeClass( 'form-invalid' );
}
}, 500 ) );

$('#add-custom-links input[type="text"]').on( 'keypress', function(e){
$('#customlinkdiv').removeClass('form-invalid');

if ( e.keyCode === 13 ) {
e.preventDefault();
$( '#submit-customlinkdiv' ).trigger( 'click' );
}
});
},

/**
* Handle toggling bulk selection checkboxes for menu items.
*
* @since 5.8.0
*/
attachBulkSelectButtonListeners : function() {
var that = this;

$( '.bulk-select-switcher' ).on( 'change', function() {
if ( this.checked ) {
$( '.bulk-select-switcher' ).prop( 'checked', true );
that.enableBulkSelection();
} else {
$( '.bulk-select-switcher' ).prop( 'checked', false );
that.disableBulkSelection();
}
});
},

/**
* Enable bulk selection checkboxes for menu items.
*
* @since 5.8.0
*/
enableBulkSelection : function() {
var checkbox = $( '#menu-to-edit .menu-item-checkbox' );

$( '#menu-to-edit' ).addClass( 'bulk-selection' );
$( '#nav-menu-bulk-actions-top' ).addClass( 'bulk-selection' );
$( '#nav-menu-bulk-actions-bottom' ).addClass( 'bulk-selection' );

$.each( checkbox, function() {
$(this).prop( 'disabled', false );
});
},

/**
* Disable bulk selection checkboxes for menu items.
*
* @since 5.8.0
*/
disableBulkSelection : function() {
var checkbox = $( '#menu-to-edit .menu-item-checkbox' );

$( '#menu-to-edit' ).removeClass( 'bulk-selection' );
$( '#nav-menu-bulk-actions-top' ).removeClass( 'bulk-selection' );
$( '#nav-menu-bulk-actions-bottom' ).removeClass( 'bulk-selection' );

if ( $( '.menu-items-delete' ).is( '[aria-describedby="pending-menu-items-to-delete"]' ) ) {
$( '.menu-items-delete' ).removeAttr( 'aria-describedby' );
}

$.each( checkbox, function() {
$(this).prop( 'disabled', true ).prop( 'checked', false );
});

$( '.menu-items-delete' ).addClass( 'disabled' );
$( '#pending-menu-items-to-delete ul' ).empty();
},

/**
* Listen for state changes on bulk action checkboxes.
*
* @since 5.8.0
*/
attachMenuCheckBoxListeners : function() {
var that = this;

$( '#menu-to-edit' ).on( 'change', '.menu-item-checkbox', function() {
that.setRemoveSelectedButtonStatus();
});
},

/**
* Create delete button to remove menu items from collection.
*
* @since 5.8.0
*/
attachMenuItemDeleteButton : function() {
var that = this;

$( document ).on( 'click', '.menu-items-delete', function( e ) {
var itemsPendingDeletion, itemsPendingDeletionList, deletionSpeech;

e.preventDefault();

if ( ! $(this).hasClass( 'disabled' ) ) {
$.each( $( '.menu-item-checkbox:checked' ), function( index, element ) {
$( element ).parents( 'li' ).find( 'a.item-delete' ).trigger( 'click' );
});

$( '.menu-items-delete' ).addClass( 'disabled' );
$( '.bulk-select-switcher' ).prop( 'checked', false );

itemsPendingDeletion     = '';
itemsPendingDeletionList = $( '#pending-menu-items-to-delete ul li' );

$.each( itemsPendingDeletionList, function( index, element ) {
var itemName = $( element ).find( '.pending-menu-item-name' ).text();
var itemSpeech = menus.menuItemDeletion.replace( '%s', itemName );

itemsPendingDeletion += itemSpeech;
if ( ( index + 1 ) < itemsPendingDeletionList.length ) {
itemsPendingDeletion += ', ';
}
});

deletionSpeech = menus.itemsDeleted.replace( '%s', itemsPendingDeletion );
wp.a11y.speak( deletionSpeech, 'polite' );
that.disableBulkSelection();
}
});
},

/**
* List menu items awaiting deletion.
*
* @since 5.8.0
*/
attachPendingMenuItemsListForDeletion : function() {
$( '#post-body-content' ).on( 'change', '.menu-item-checkbox', function() {
var menuItemName, menuItemType, menuItemID, listedMenuItem;

if ( ! $( '.menu-items-delete' ).is( '[aria-describedby="pending-menu-items-to-delete"]' ) ) {
$( '.menu-items-delete' ).attr( 'aria-describedby', 'pending-menu-items-to-delete' );
}

menuItemName = $(this).next().text();
menuItemType = $(this).parent().next( '.item-controls' ).find( '.item-type' ).text();
menuItemID   = $(this).attr( 'data-menu-item-id' );

listedMenuItem = $( '#pending-menu-items-to-delete ul' ).find( '[data-menu-item-id=' + menuItemID + ']' );
if ( listedMenuItem.length > 0 ) {
listedMenuItem.remove();
}

if ( this.checked === true ) {
$( '#pending-menu-items-to-delete ul' ).append(
'<li data-menu-item-id="' + menuItemID + '">' +
'<span class="pending-menu-item-name">' + menuItemName + '</span> ' +
'<span class="pending-menu-item-type">(' + menuItemType + ')</span>' +
'<span class="separator"></span>' +
'</li>'
);
}

$( '#pending-menu-items-to-delete li .separator' ).html( ', ' );
$( '#pending-menu-items-to-delete li .separator' ).last().html( '.' );
});
},

/**
* Set status of bulk delete checkbox.
*
* @since 5.8.0
*/
setBulkDeleteCheckboxStatus : function() {
var that = this;
var checkbox = $( '#menu-to-edit .menu-item-checkbox' );

$.each( checkbox, function() {
if ( $(this).prop( 'disabled' ) ) {
$(this).prop( 'disabled', false );
} else {
$(this).prop( 'disabled', true );
}

if ( $(this).is( ':checked' ) ) {
$(this).prop( 'checked', false );
}
});

that.setRemoveSelectedButtonStatus();
},

/**
* Set status of menu items removal button.
*
* @since 5.8.0
*/
setRemoveSelectedButtonStatus : function() {
var button = $( '.menu-items-delete' );

if ( $( '.menu-item-checkbox:checked' ).length > 0 ) {
button.removeClass( 'disabled' );
} else {
button.addClass( 'disabled' );
}
},

attachMenuSaveSubmitListeners : function() {
/*
* When a navigation menu is saved, store a JSON representation of all form data
* in a single input to avoid PHP `max_input_vars` limitations. See #14134.
*/
$( '#update-nav-menu' ).on( 'submit', function() {
var navMenuData = $( '#update-nav-menu' ).serializeArray();
$( '[name="nav-menu-data"]' ).val( JSON.stringify( navMenuData ) );
});
},

attachThemeLocationsListeners : function() {
var loc = $('#nav-menu-theme-locations'), params = {};
params.action = 'menu-locations-save';
params['menu-settings-column-nonce'] = $('#menu-settings-column-nonce').val();
loc.find('input[type="submit"]').on( 'click', function() {
loc.find('select').each(function() {
params[this.name] = $(this).val();
});
loc.find( '.spinner' ).addClass( 'is-active' );
$.post( ajaxurl, params, function() {
loc.find( '.spinner' ).removeClass( 'is-active' );
});
return false;
});
},

attachQuickSearchListeners : function() {
var searchTimer;

// Prevent form submission.
$( '#nav-menu-meta' ).on( 'submit', function( event ) {
event.preventDefault();
});

$( '#nav-menu-meta' ).on( 'input', '.quick-search', function() {
var $this = $( this );

$this.attr( 'autocomplete', 'off' );

if ( searchTimer ) {
clearTimeout( searchTimer );
}

searchTimer = setTimeout( function() {
api.updateQuickSearchResults( $this );
}, 500 );
}).on( 'blur', '.quick-search', function() {
api.lastSearch = '';
});
},

updateQuickSearchResults : function(input) {
var panel, params,
minSearchLength = 2,
q = input.val();

/*
* Minimum characters for a search. Also avoid a new Ajax search when
* the pressed key (e.g. arrows) doesn't change the searched term.
*/
if ( q.length < minSearchLength || api.lastSearch == q ) {
return;
}

api.lastSearch = q;

panel = input.parents('.tabs-panel');
params = {
'action': 'menu-quick-search',
'response-format': 'markup',
'menu': $('#menu').val(),
'menu-settings-column-nonce': $('#menu-settings-column-nonce').val(),
'q': q,
'type': input.attr('name')
};

$( '.spinner', panel ).addClass( 'is-active' );

$.post( ajaxurl, params, function(menuMarkup) {
api.processQuickSearchQueryResponse(menuMarkup, params, panel);
});
},

addCustomLink : function( processMethod ) {
var url = $('#custom-menu-item-url').val().toString(),
label = $('#custom-menu-item-name').val();

if ( '' !== url ) {
url = url.trim();
}

processMethod = processMethod || api.addMenuItemToBottom;

if ( '' === url || 'https://' == url || 'http://' == url ) {
$('#customlinkdiv').addClass('form-invalid');
return false;
}

// Show the Ajax spinner.
$( '.customlinkdiv .spinner' ).addClass( 'is-active' );
this.addLinkToMenu( url, label, processMethod, function() {
// Remove the Ajax spinner.
$( '.customlinkdiv .spinner' ).removeClass( 'is-active' );
// Set custom link form back to defaults.
$('#custom-menu-item-name').val('').trigger( 'blur' );
$( '#custom-menu-item-url' ).val( '' ).attr( 'placeholder', 'https://' );
});
},

addLinkToMenu : function(url, label, processMethod, callback) {
processMethod = processMethod || api.addMenuItemToBottom;
callback = callback || function(){};

api.addItemToMenu({
'-1': {
'menu-item-type': 'custom',
'menu-item-url': url,
'menu-item-title': label
}
}, processMethod, callback);
},

addItemToMenu : function(menuItem, processMethod, callback) {
var menu = $('#menu').val(),
nonce = $('#menu-settings-column-nonce').val(),
params;

processMethod = processMethod || function(){};
callback = callback || function(){};

params = {
'action': 'add-menu-item',
'menu': menu,
'menu-settings-column-nonce': nonce,
'menu-item': menuItem
};

$.post( ajaxurl, params, function(menuMarkup) {
var ins = $('#menu-instructions');

menuMarkup = menuMarkup || '';
menuMarkup = menuMarkup.toString().trim(); // Trim leading whitespaces.
processMethod(menuMarkup, params);

// Make it stand out a bit more visually, by adding a fadeIn.
$( 'li.pending' ).hide().fadeIn('slow');
$( '.drag-instructions' ).show();
if( ! ins.hasClass( 'menu-instructions-inactive' ) && ins.siblings().length )
ins.addClass( 'menu-instructions-inactive' );

callback();
});
},

/**
* Process the add menu item request response into menu list item. Appends to menu.
*
* @param {string} menuMarkup The text server response of menu item markup.
*
* @fires document#menu-item-added Passes menuMarkup as a jQuery object.
*/
addMenuItemToBottom : function( menuMarkup ) {
var $menuMarkup = $( menuMarkup );
$menuMarkup.hideAdvancedMenuItemFields().appendTo( api.targetList );
api.refreshKeyboardAccessibility();
api.refreshAdvancedAccessibility();
wp.a11y.speak( menus.itemAdded );
$( document ).trigger( 'menu-item-added', [ $menuMarkup ] );
},

/**
* Process the add menu item request response into menu list item. Prepends to menu.
*
* @param {string} menuMarkup The text server response of menu item markup.
*
* @fires document#menu-item-added Passes menuMarkup as a jQuery object.
*/
addMenuItemToTop : function( menuMarkup ) {
var $menuMarkup = $( menuMarkup );
$menuMarkup.hideAdvancedMenuItemFields().prependTo( api.targetList );
api.refreshKeyboardAccessibility();
api.refreshAdvancedAccessibility();
wp.a11y.speak( menus.itemAdded );
$( document ).trigger( 'menu-item-added', [ $menuMarkup ] );
},

attachUnsavedChangesListener : function() {
$('#menu-management input, #menu-management select, #menu-management, #menu-management textarea, .menu-location-menus select').on( 'change', function(){
api.registerChange();
});

if ( 0 !== $('#menu-to-edit').length || 0 !== $('.menu-location-menus select').length ) {
window.onbeforeunload = function(){
if ( api.menusChanged )
return wp.i18n.__( 'The changes you made will be lost if you navigate away from this page.' );
};
} else {
// Make the post boxes read-only, as they can't be used yet.
$( '#menu-settings-column' ).find( 'input,select' ).end().find( 'a' ).attr( 'href', '#' ).off( 'click' );
}
},

registerChange : function() {
api.menusChanged = true;
},

attachTabsPanelListeners : function() {
$('#menu-settings-column').on('click', function(e) {
var selectAreaMatch, selectAll, panelId, wrapper, items,
target = $(e.target);

if ( target.hasClass('nav-tab-link') ) {

panelId = target.data( 'type' );

wrapper = target.parents('.accordion-section-content').first();

// Upon changing tabs, we want to uncheck all checkboxes.
$( 'input', wrapper ).prop( 'checked', false );

$('.tabs-panel-active', wrapper).removeClass('tabs-panel-active').addClass('tabs-panel-inactive');
$('#' + panelId, wrapper).removeClass('tabs-panel-inactive').addClass('tabs-panel-active');

$('.tabs', wrapper).removeClass('tabs');
target.parent().addClass('tabs');

// Select the search bar.
$('.quick-search', wrapper).trigger( 'focus' );

// Hide controls in the search tab if no items found.
if ( ! wrapper.find( '.tabs-panel-active .menu-item-title' ).length ) {
wrapper.addClass( 'has-no-menu-item' );
} else {
wrapper.removeClass( 'has-no-menu-item' );
}

e.preventDefault();
} else if ( target.hasClass( 'select-all' ) ) {
selectAreaMatch = target.closest( '.button-controls' ).data( 'items-type' );
if ( selectAreaMatch ) {
items = $( '#' + selectAreaMatch + ' .tabs-panel-active .menu-item-title input' );

if ( items.length === items.filter( ':checked' ).length && ! target.is( ':checked' ) ) {
items.prop( 'checked', false );
} else if ( target.is( ':checked' ) ) {
items.prop( 'checked', true );
}
}
} else if ( target.hasClass( 'menu-item-checkbox' ) ) {
selectAreaMatch = target.closest( '.tabs-panel-active' ).parent().attr( 'id' );
if ( selectAreaMatch ) {
items     = $( '#' + selectAreaMatch + ' .tabs-panel-active .menu-item-title input' );
selectAll = $( '.button-controls[data-items-type="' + selectAreaMatch + '"] .select-all' );

if ( items.length === items.filter( ':checked' ).length && ! selectAll.is( ':checked' ) ) {
selectAll.prop( 'checked', true );
} else if ( selectAll.is( ':checked' ) ) {
selectAll.prop( 'checked', false );
}
}
} else if ( target.hasClass('submit-add-to-menu') ) {
api.registerChange();

if ( e.target.id && 'submit-customlinkdiv' == e.target.id )
api.addCustomLink( api.addMenuItemToBottom );
else if ( e.target.id && -1 != e.target.id.indexOf('submit-') )
$('#' + e.target.id.replace(/submit-/, '')).addSelectedToMenu( api.addMenuItemToBottom );
return false;
}
});

/*
* Delegate the `click` event and attach it just to the pagination
* links thus excluding the current page `<span>`. See ticket #35577.
*/
$( '#nav-menu-meta' ).on( 'click', 'a.page-numbers', function() {
var $container = $( this ).closest( '.inside' );

$.post( ajaxurl, this.href.replace( /.*\?/, '' ).replace( /action=([^&]*)/, '' ) + '&action=menu-get-metabox',
function( resp ) {
var metaBoxData = JSON.parse( resp ),
toReplace;

if ( -1 === resp.indexOf( 'replace-id' ) ) {
return;
}

// Get the post type menu meta box to update.
toReplace = document.getElementById( metaBoxData['replace-id'] );

if ( ! metaBoxData.markup || ! toReplace ) {
return;
}

// Update the post type menu meta box with new content from the response.
$container.html( metaBoxData.markup );
}
);

return false;
});
},

eventOnClickEditLink : function(clickedEl) {
var settings, item,
matchedSection = /#(.*)$/.exec(clickedEl.href);

if ( matchedSection && matchedSection[1] ) {
settings = $('#'+matchedSection[1]);
item = settings.parent();
if( 0 !== item.length ) {
if( item.hasClass('menu-item-edit-inactive') ) {
if( ! settings.data('menu-item-data') ) {
settings.data( 'menu-item-data', settings.getItemData() );
}
settings.slideDown('fast');
item.removeClass('menu-item-edit-inactive')
.addClass('menu-item-edit-active');
} else {
settings.slideUp('fast');
item.removeClass('menu-item-edit-active')
.addClass('menu-item-edit-inactive');
}
return false;
}
}
},

eventOnClickCancelLink : function(clickedEl) {
var settings = $( clickedEl ).closest( '.menu-item-settings' ),
thisMenuItem = $( clickedEl ).closest( '.menu-item' );

thisMenuItem.removeClass( 'menu-item-edit-active' ).addClass( 'menu-item-edit-inactive' );
settings.setItemData( settings.data( 'menu-item-data' ) ).hide();
// Restore the title of the currently active/expanded menu item.
thisMenuItem.find( '.menu-item-title' ).text( settings.data( 'menu-item-data' )['menu-item-title'] );

return false;
},

eventOnClickMenuSave : function() {
var locs = '',
menuName = $('#menu-name'),
menuNameVal = menuName.val();

// Cancel and warn if invalid menu name.
if ( ! menuNameVal || ! menuNameVal.replace( /\s+/, '' ) ) {
menuName.parent().addClass( 'form-invalid' );
return false;
}
// Copy menu theme locations.
$('#nav-menu-theme-locations select').each(function() {
locs += '<input type="hidden" name="' + this.name + '" value="' + $(this).val() + '" />';
});
$('#update-nav-menu').append( locs );
// Update menu item position data.
api.menuList.find('.menu-item-data-position').val( function(index) { return index + 1; } );
window.onbeforeunload = null;

return true;
},

eventOnClickMenuDelete : function() {
// Delete warning AYS.
if ( window.confirm( wp.i18n.__( 'You are about to permanently delete this menu.\n\'Cancel\' to stop, \'OK\' to delete.' ) ) ) {
window.onbeforeunload = null;
return true;
}
return false;
},

eventOnClickMenuItemDelete : function(clickedEl) {
var itemID = parseInt(clickedEl.id.replace('delete-', ''), 10);

api.removeMenuItem( $('#menu-item-' + itemID) );
api.registerChange();
return false;
},

/**
* Process the quick search response into a search result
*
* @param string resp The server response to the query.
* @param object req The request arguments.
* @param jQuery panel The tabs panel we're searching in.
*/
processQuickSearchQueryResponse : function(resp, req, panel) {
var matched, newID,
takenIDs = {},
form = document.getElementById('nav-menu-meta'),
pattern = /menu-item[(\[^]\]*/,
$items = $('<div>').html(resp).find('li'),
wrapper = panel.closest( '.accordion-section-content' ),
selectAll = wrapper.find( '.button-controls .select-all' ),
$item;

if( ! $items.length ) {
$('.categorychecklist', panel).html( '<li><p>' + wp.i18n.__( 'No results found.' ) + '</p></li>' );
$( '.spinner', panel ).removeClass( 'is-active' );
wrapper.addClass( 'has-no-menu-item' );
return;
}

$items.each(function(){
$item = $(this);

// Make a unique DB ID number.
matched = pattern.exec($item.html());

if ( matched && matched[1] ) {
newID = matched[1];
while( form.elements['menu-item[' + newID + '][menu-item-type]'] || takenIDs[ newID ] ) {
newID--;
}

takenIDs[newID] = true;
if ( newID != matched[1] ) {
$item.html( $item.html().replace(new RegExp(
'menu-item\\[' + matched[1] + '\\]', 'g'),
'menu-item[' + newID + ']'
) );
}
}
});

$('.categorychecklist', panel).html( $items );
$( '.spinner', panel ).removeClass( 'is-active' );
wrapper.removeClass( 'has-no-menu-item' );

if ( selectAll.is( ':checked' ) ) {
selectAll.prop( 'checked', false );
}
},

/**
* Remove a menu item.
*
* @param {Object} el The element to be removed as a jQuery object.
*
* @fires document#menu-removing-item Passes the element to be removed.
*/
removeMenuItem : function(el) {
var children = el.childMenuItems();

$( document ).trigger( 'menu-removing-item', [ el ] );
el.addClass('deleting').animate({
opacity : 0,
height: 0
}, 350, function() {
var ins = $('#menu-instructions');
el.remove();
children.shiftDepthClass( -1 ).updateParentMenuItemDBId();
if ( 0 === $( '#menu-to-edit li' ).length ) {
$( '.drag-instructions' ).hide();
ins.removeClass( 'menu-instructions-inactive' );
}
api.refreshAdvancedAccessibility();
wp.a11y.speak( menus.itemRemoved );
});
},

depthToPx : function(depth) {
return depth * api.options.menuItemDepthPerLevel;
},

pxToDepth : function(px) {
return Math.floor(px / api.options.menuItemDepthPerLevel);
}

};

$( function() {

wpNavMenu.init();

// Prevent focused element from being hidden by the sticky footer.
$( '.menu-edit a, .menu-edit button, .menu-edit input, .menu-edit textarea, .menu-edit select' ).on('focus', function() {
if ( window.innerWidth >= 783 ) {
var navMenuHeight = $( '#nav-menu-footer' ).height() + 20;
var bottomOffset = $(this).offset().top - ( $(window).scrollTop() + $(window).height() - $(this).height() );

if ( bottomOffset > 0 ) {
bottomOffset = 0;
}
bottomOffset = bottomOffset * -1;

if( bottomOffset < navMenuHeight ) {
var scrollTop = $(document).scrollTop();
$(document).scrollTop( scrollTop + ( navMenuHeight - bottomOffset ) );
}
}
});
});

})(jQuery);