WordPress/wp-content/themes/twentythirteen/js/functions.js

126 lines
3.3 KiB
JavaScript

/**
* Functionality specific to Twenty Thirteen.
*
* Provides helper functions to enhance the theme experience.
*/
( function( $ ) {
var html = $( 'html' ),
body = $( 'body' ),
navbar = $( '#navbar' ),
_window = $( window ),
toolbarOffset = body.is( '.admin-bar' ) ? 28 : 0,
navbarOffset = navbar.offset().top - toolbarOffset,
scrollOffsetMethod = ( typeof window.scrollY === 'undefined' ),
adjustFooter,
adjustAnchor;
/**
* Adds a top margin to the footer if the sidebar widget area is
* higher than the rest of the page, to help the footer always
* visually clear the sidebar.
*/
adjustFooter = function() {
var sidebar = $( '#secondary .widget-area' ),
secondary = ( 0 == sidebar.length ) ? -40 : sidebar.height(),
margin = $( '#tertiary .widget-area' ).height() - $( '#content' ).height() - secondary;
if ( margin > 0 && _window.innerWidth() > 999 )
$( '#colophon' ).css( 'margin-top', margin + 'px' );
};
/**
* Repositions the window on jump-to-anchor to account for navbar
* height.
*/
adjustAnchor = function() {
if ( window.location.hash )
window.scrollBy( 0, -49 );
};
$( function() {
adjustAnchor();
if ( body.is( '.sidebar' ) )
adjustFooter();
} );
_window.on( 'hashchange.twentythirteen', adjustAnchor );
/**
* Displays the fixed navbar based on screen position.
*/
if ( _window.innerWidth() > 644 ) {
_window.on( 'scroll.twentythirteen', function() {
var scrollOffset = scrollOffsetMethod ? document.documentElement.scrollTop : window.scrollY;
if ( scrollOffset > navbarOffset )
html.addClass( 'navbar-fixed' );
else
html.removeClass( 'navbar-fixed' );
} );
}
/**
* Allows clicking the navbar to scroll to top.
*/
navbar.on( 'click.twentythirteen', function( event ) {
// Ensure that the navbar element was the target of the click.
if ( 'navbar' == event.target.id || 'site-navigation' == event.target.id )
$( 'html, body' ).animate( { scrollTop: 0 }, 'fast' );
} );
/**
* Enables menu toggle for small screens.
*/
( function() {
var nav = $( '#site-navigation' ), button, menu;
if ( ! nav )
return;
button = nav.find( '.menu-toggle' );
menu = nav.find( '.nav-menu' );
if ( ! button )
return;
// Hide button if menu is missing or empty.
if ( ! menu || ! menu.children().length ) {
button.hide();
return;
}
$( '.menu-toggle' ).on( 'click.twentythirteen', function() {
nav.toggleClass( 'toggled-on' );
} );
} )();
/**
* Makes "skip to content" link work correctly in IE9 and Chrome for better
* accessibility.
*
* @link http://www.nczonline.net/blog/2013/01/15/fixing-skip-to-content-links/
*/
_window.on( 'hashchange.twentythirteen', function() {
var element = $( location.hash );
if ( element ) {
if ( ! /^(?:a|select|input|button)$/i.test( element.tagName ) )
element.attr( 'tabindex', -1 );
element.focus();
}
} );
/**
* Arranges footer widgets vertically.
*/
if ( $.isFunction( $.fn.masonry ) ) {
var columnWidth = body.is( '.sidebar' ) ? 228 : 245;
$( '#secondary .widget-area' ).masonry( {
itemSelector: '.widget',
columnWidth: columnWidth,
gutterWidth: 20,
isRTL: body.is( '.rtl' )
} );
}
} )( jQuery );