/**
 * This file is part of the evoCore framework - {@link http://evocore.net/}
 * See also {@link https://github.com/b2evolution/b2evolution}.
 * @version $Id: form_extensions.js 8373 2015-02-28 21:44:37Z fplanque $
 */


/**
 * Takes an object and returns the parent form
 *
 * @param object the child object
 * @return form the parent form of the child object
 */
function get_form( object )
{
  while( object.tagName != 'FORM' )
{ // loop which goes from the checkbox to the form
// alert( object.nodeName );
if( typeof( object ) != 'undefined' ) // make sure that we have not gone too far
{
object = object.parentNode;
}
else
{
return false;
}
}
// alert( 'ok:'+object.tagName );
return object;
}


/*
 * Cancel a click event
 */
function cancelClick( e )
{
if( window.event && window.event.returnValue )
{ // Ie
window.event.returnValue = false;
}
if( e && e.preventDefault )
{ // Firefox
e.preventDefault();
}
return false;
}


/**
 * Clear the form the current object belongs to
 *
 * @param object the object whose form must be cleared
 */
function clear_form( object )
{
object = check( object, false );

// empties all the input fields of the form
i = 0;
while( i < object.length )
{
if( object.elements[i].type == 'text' )
{
object.elements[i].value = '';
}
i++;
}

return object;
}


/**
 * focus on the first form input text
 */
function focus_on_first_input()
{
all_inputs = document.getElementsByTagName( 'input' );

if( all_inputs.length )
{ // There is at least one input
// Loop on all inputs to find the first input text
for( i = 0 ; i < all_inputs.length ; i++ )
{
      if( all_inputs[i].type == 'text'
&& all_inputs[i].disabled != true
)
{ // We found the first input text, so we focus on it
try
{ // Will fail in IE if element is not visible/displayed
all_inputs[i].focus();
}
catch( ex )
{
}
break;
}
}
}
}

// This will be conditionnaly enabled by PHP:
//addEvent( window, 'load', focus_on_first_input, false );

/**
 * Handle Combo Boxes
 * Display the input text when value is 'new'(first option to enter new value)
 * and hide the input text for all other values
 *
 * @param string|object jQuery selector or JavaScript object of the combo box <select> element
 */
function check_combo( selector )
{
var select_obj = jQuery( selector ),
input_obj = select_obj.next();

if( select_obj.find( 'option:first' ).is( ':selected' ) )
{ // Display the input text and focus on:
input_obj.show().focus();
if( select_obj.attr( 'required' ) == 'required' )
{ // Combo box is required, restore the appropriate attribute for input:
input_obj.attr( 'required', 'required' );
}
}
else
{ // Hide the input text:
input_obj.hide();
input_obj.removeAttr( 'required' );
}
}


/**
 * Decorate an input field with a "help value", which gets
 * removed onfocus and re-added onblur (if the fields real
 * value is still unchanged).
 *
 * @param string ID of the input field
 * @param string "Help value"
 */
function input_decorated_help( id, hvalue )
{
var elm = document.getElementById(id);

var onblur = function() {
if( elm.value == '' || elm.value == hvalue )
{
elm.style.color = '#666';
elm.value = hvalue;
}
}

jQuery( elm ).bind( 'blur', onblur );

jQuery( elm ).bind( 'focus', function() {
elm.style.color = '';

if( elm.value == hvalue )
elm.value = '';
} );

/* on form's submit: set to empty, if help value */
jQuery( elm.form ).bind( 'submit', function() {
if( elm.value == hvalue )
{
elm.value = '';
}
} );

// init:
onblur();
}


/**
 * caters for the differences between Internet Explorer and fully DOM-supporting browsers
 */
function findTarget( e )
{
var target;

if( window.event && window.event.srcElement )
target = window.event.srcElement;
else if( e && e.target )
target = e.target;
if( ! target )
return null;

while( target != document.body && target.nodeName.toLowerCase() != 'a' )
target = target.parentNode;

if( target.nodeName.toLowerCase() != 'a' )
return null;

return target;
}


/**
 * Add spinner to button
 */
function addSpinner( button )
{
button = jQuery( button );
button.addClass( 'btn-spinner' );
button.css( 'width', '+=24px' );
}


/**
 * Set custom validity of field based on input value length
 * @param obj Input field
 * @param integer mininum input value length
 * @param string message to display if input value does not meet minimum length
 */
function checkInputLength( input, minLength, message )
{
if( input.value.length < minLength )
{
input.setCustomValidity( message );
}
else
{
input.setCustomValidity( '' );
}
}