WordPress/wp-includes/js/customize-preview.js

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/*
* Script run inside a Customizer preview frame.
*/
(function( exports, $ ){
var api = wp.customize,
debounce;
/**
* Returns a debounced version of the function.
*
* @todo Require Underscore.js for this file and retire this.
*/
debounce = function( fn, delay, context ) {
var timeout;
return function() {
var args = arguments;
context = context || this;
clearTimeout( timeout );
timeout = setTimeout( function() {
timeout = null;
fn.apply( context, args );
}, delay );
};
};
/**
* @constructor
* @augments wp.customize.Messenger
* @augments wp.customize.Class
* @mixes wp.customize.Events
*/
api.Preview = api.Messenger.extend({
/**
* @param {object} params - Parameters to configure the messenger.
* @param {object} options - Extend any instance parameter or method with this object.
*/
initialize: function( params, options ) {
var self = this;
api.Messenger.prototype.initialize.call( this, params, options );
this.body = $( document.body );
this.body.on( 'click.preview', 'a', function( event ) {
var link, isInternalJumpLink;
link = $( this );
isInternalJumpLink = ( '#' === link.attr( 'href' ).substr( 0, 1 ) );
event.preventDefault();
if ( isInternalJumpLink && '#' !== link.attr( 'href' ) ) {
$( link.attr( 'href' ) ).each( function() {
this.scrollIntoView();
} );
}
/*
* Note the shift key is checked so shift+click on widgets or
* nav menu items can just result on focusing on the corresponding
* control instead of also navigating to the URL linked to.
*/
if ( event.shiftKey || isInternalJumpLink ) {
return;
}
self.send( 'scroll', 0 );
self.send( 'url', link.prop( 'href' ) );
});
// You cannot submit forms.
this.body.on( 'submit.preview', 'form', function( event ) {
var urlParser;
/*
* If the default wasn't prevented already (in which case the form
* submission is already being handled by JS), and if it has a GET
* request method, then take the serialized form data and add it as
* a query string to the action URL and send this in a url message
* to the customizer pane so that it will be loaded. If the form's
* action points to a non-previewable URL, the customizer pane's
* previewUrl setter will reject it so that the form submission is
* a no-op, which is the same behavior as when clicking a link to an
* external site in the preview.
*/
if ( ! event.isDefaultPrevented() && 'GET' === this.method.toUpperCase() ) {
urlParser = document.createElement( 'a' );
urlParser.href = this.action;
if ( urlParser.search.substr( 1 ).length > 1 ) {
urlParser.search += '&';
}
urlParser.search += $( this ).serialize();
api.preview.send( 'url', urlParser.href );
}
event.preventDefault();
});
this.window = $( window );
this.window.on( 'scroll.preview', debounce( function() {
self.send( 'scroll', self.window.scrollTop() );
}, 200 ));
this.bind( 'scroll', function( distance ) {
self.window.scrollTop( distance );
});
}
});
$( function() {
var bg, setValue;
api.settings = window._wpCustomizeSettings;
if ( ! api.settings ) {
return;
}
api.preview = new api.Preview({
url: window.location.href,
channel: api.settings.channel
});
/**
* Create/update a setting value.
*
* @param {string} id - Setting ID.
* @param {*} value - Setting value.
* @param {boolean} [createDirty] - Whether to create a setting as dirty. Defaults to false.
*/
setValue = function( id, value, createDirty ) {
var setting = api( id );
if ( setting ) {
setting.set( value );
} else {
createDirty = createDirty || false;
setting = api.create( id, value, {
id: id
} );
// Mark dynamically-created settings as dirty so they will get posted.
if ( createDirty ) {
setting._dirty = true;
}
}
};
api.preview.bind( 'settings', function( values ) {
$.each( values, setValue );
});
api.preview.trigger( 'settings', api.settings.values );
$.each( api.settings._dirty, function( i, id ) {
var setting = api( id );
if ( setting ) {
setting._dirty = true;
}
} );
api.preview.bind( 'setting', function( args ) {
var createDirty = true;
setValue.apply( null, args.concat( createDirty ) );
});
api.preview.bind( 'sync', function( events ) {
$.each( events, function( event, args ) {
api.preview.trigger( event, args );
});
api.preview.send( 'synced' );
});
api.preview.bind( 'active', function() {
api.preview.send( 'nonce', api.settings.nonce );
api.preview.send( 'documentTitle', document.title );
});
api.preview.bind( 'saved', function( response ) {
api.trigger( 'saved', response );
} );
api.bind( 'saved', function() {
api.each( function( setting ) {
setting._dirty = false;
} );
} );
api.preview.bind( 'nonce-refresh', function( nonce ) {
$.extend( api.settings.nonce, nonce );
} );
/*
* Send a message to the parent customize frame with a list of which
* containers and controls are active.
*/
api.preview.send( 'ready', {
activePanels: api.settings.activePanels,
activeSections: api.settings.activeSections,
activeControls: api.settings.activeControls,
settingValidities: api.settings.settingValidities
} );
// Display a loading indicator when preview is reloading, and remove on failure.
api.preview.bind( 'loading-initiated', function () {
$( 'body' ).addClass( 'wp-customizer-unloading' );
});
api.preview.bind( 'loading-failed', function () {
$( 'body' ).removeClass( 'wp-customizer-unloading' );
});
/* Custom Backgrounds */
bg = $.map(['color', 'image', 'position_x', 'repeat', 'attachment'], function( prop ) {
return 'background_' + prop;
});
api.when.apply( api, bg ).done( function( color, image, position_x, repeat, attachment ) {
var body = $(document.body),
head = $('head'),
style = $('#custom-background-css'),
update;
update = function() {
var css = '';
// The body will support custom backgrounds if either
// the color or image are set.
//
// See get_body_class() in /wp-includes/post-template.php
body.toggleClass( 'custom-background', !! ( color() || image() ) );
if ( color() )
css += 'background-color: ' + color() + ';';
if ( image() ) {
css += 'background-image: url("' + image() + '");';
css += 'background-position: top ' + position_x() + ';';
css += 'background-repeat: ' + repeat() + ';';
css += 'background-attachment: ' + attachment() + ';';
}
// Refresh the stylesheet by removing and recreating it.
style.remove();
style = $('<style type="text/css" id="custom-background-css">body.custom-background { ' + css + ' }</style>').appendTo( head );
};
$.each( arguments, function() {
this.bind( update );
});
});
/**
* Custom Logo
*
* Toggle the wp-custom-logo body class when a logo is added or removed.
*
* @since 4.5.0
*/
api( 'custom_logo', function( setting ) {
$( 'body' ).toggleClass( 'wp-custom-logo', !! setting.get() );
setting.bind( function( attachmentId ) {
$( 'body' ).toggleClass( 'wp-custom-logo', !! attachmentId );
} );
} );
api.trigger( 'preview-ready' );
});
})( wp, jQuery );