/**
 * This file initialize plugin "Table Contents"
 *
 * This file is part of the evoCore framework - {@link http://evocore.net/}
 * See also {@link https://github.com/b2evolution/b2evolution}.
 *
 * @license GNU GPL v2 - {@link http://b2evolution.net/about/gnu-gpl-license}
 *
 * @copyright (c)2003-2020 by Francois PLANQUE - {@link http://fplanque.com/}
 *
 * Depends on jQuery
 */

jQuery( document ).ready( function()
{
if( typeof( evo_plugin_table_contents_settings ) == 'undefined' )
{ // Don't execute code below because no config var is found:
return;
}

var evo_toolbar_height = jQuery( '#evo_toolbar' ).length ? jQuery( '#evo_toolbar' ).height() : 0;
jQuery( '.evo_plugin__table_of_contents a' ).on( 'click', function()
{
var header_object = jQuery( '#' + jQuery( this ).data( 'anchor' ) );
if( header_object.length == 0 ||
! header_object.prop( 'tagName' ).match( /^h[1-6]$/i ) )
{ // No header tag with required anchor:
return true;
}
var link_href = jQuery( this ).attr( 'href' );
jQuery( 'html,body' ).animate(
{ // Scroll to anchor:
scrollTop: header_object.offset().top - evo_toolbar_height - evo_plugin_table_contents_settings.offset_scroll
},
function()
{ // Update URL with proper anchor in browser address bar:
window.history.pushState( '', '', link_href );
} );
return false;
} );
} );