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Edit File: link.js

/**
 * @output wp-admin/js/link.js
 */

/* global postboxes, deleteUserSetting, setUserSetting, getUserSetting */

jQuery( function($) {

var newCat, noSyncChecks = false, syncChecks, catAddAfter;

$('#link_name').trigger( 'focus' );
	// Postboxes.
	postboxes.add_postbox_toggles('link');

/**
	 * Adds event that opens a particular category tab.
	 *
	 * @ignore
	 *
	 * @return {boolean} Always returns false to prevent the default behavior.
	 */
	$('#category-tabs a').on( 'click', function(){
		var t = $(this).attr('href');
		$(this).parent().addClass('tabs').siblings('li').removeClass('tabs');
		$('.tabs-panel').hide();
		$(t).show();
		if ( '#categories-all' == t )
			deleteUserSetting('cats');
		else
			setUserSetting('cats','pop');
		return false;
	});
	if ( getUserSetting('cats') )
		$('#category-tabs a[href="#categories-pop"]').trigger( 'click' );

// Ajax Cat.
	newCat = $('#newcat').one( 'focus', function() { $(this).val( '' ).removeClass( 'form-input-tip' ); } );

/**
	 * After adding a new category, focus on the category add input field.
	 *
	 * @return {void}
	 */
	$('#link-category-add-submit').on( 'click', function() { newCat.focus(); } );

/**
	 * Synchronize category checkboxes.
	 *
	 * This function makes sure that the checkboxes are synced between the all
	 * categories tab and the most used categories tab.
	 *
	 * @since 2.5.0
	 *
	 * @return {void}
	 */
	syncChecks = function() {
		if ( noSyncChecks )
			return;
		noSyncChecks = true;
		var th = $(this), c = th.is(':checked'), id = th.val().toString();
		$('#in-link-category-' + id + ', #in-popular-link_category-' + id).prop( 'checked', c );
		noSyncChecks = false;
	};

/**
	 * Adds event listeners to an added category.
	 *
	 * This is run on the addAfter event to make sure the correct event listeners
	 * are bound to the DOM elements.
	 *
	 * @since 2.5.0
	 *
	 * @param {string} r Raw XML response returned from the server after adding a
	 *                   category.
	 * @param {Object} s List manager configuration object; settings for the Ajax
	 *                   request.
	 *
	 * @return {void}
	 */
	catAddAfter = function( r, s ) {
		$(s.what + ' response_data', r).each( function() {
			var t = $($(this).text());
			t.find( 'label' ).each( function() {
				var th = $(this),
					val = th.find('input').val(),
					id = th.find('input')[0].id,
					name = th.text().trim(),
					o;
				$('#' + id).on( 'change', syncChecks );
				o = $( '<option value="' +  parseInt( val, 10 ) + '"></option>' ).text( name );
			} );
		} );
	};

/*
	 * Instantiates the list manager.
	 *
	 * @see js/_enqueues/lib/lists.js
	 */
	$('#categorychecklist').wpList( {
		// CSS class name for alternate styling.
		alt: '',

// The type of list.
		what: 'link-category',

// ID of the element the parsed Ajax response will be stored in.
		response: 'category-ajax-response',

// Callback that's run after an item got added to the list.
		addAfter: catAddAfter
	} );

// All categories is the default tab, so we delete the user setting.
	$('a[href="#categories-all"]').on( 'click', function(){deleteUserSetting('cats');});

// Set a preference for the popular categories to cookies.
	$('a[href="#categories-pop"]').on( 'click', function(){setUserSetting('cats','pop');});

if ( 'pop' == getUserSetting('cats') )
		$('a[href="#categories-pop"]').trigger( 'click' );

/**
	 * Adds event handler that shows the interface controls to add a new category.
	 *
	 * @ignore
	 *
	 * @param {Event} event The event object.
	 * @return {boolean} Always returns false to prevent regular link
	 *                   functionality.
	 */
	$('#category-add-toggle').on( 'click', function() {
		$(this).parents('div:first').toggleClass( 'wp-hidden-children' );
		$('#category-tabs a[href="#categories-all"]').trigger( 'click' );
		$('#newcategory').trigger( 'focus' );
		return false;
	} );

$('.categorychecklist :checkbox').on( 'change', syncChecks ).filter( ':checked' ).trigger( 'change' );
});