Hash history with jQuery BBQ
As cool as Isotope is, the only thing that could make it even cooler would be adding bookmark-able URL hashes. Ben Alman’s jQuery BBQ allows us to do just that.
jQuery BBQ leverages the HTML5 hashchange event to allow simple, yet powerful bookmarkable #hash history.
BBQ is a marvelous plugin that provides for a lot more functionality. The hash history demo uses multiple options (sortBy, sortAscending, and layoutMode in addition to filter), the ability to use back-button history, and properly highlights selected links.
Given BBQ’s tremendous capabilities, the code can grow to be a bit complex. Be sure to read through BBQ’s docs and take look at its examples before you dive in and code up your own solution.
Markup
Instead of setting the option values and keys with data attributes, we can add the option in the href for each link.
<ul class="option-set">
<li><a href="#filter=*" class="selected">show all</a></li>
<li><a href="#filter=.metal">metal</a></li>
<li><a href="#filter=.transition">transition</a></li>
<li><a href="#filter=.alkali%2C+.alkaline-earth">alkali and alkaline-earth</a></li>
<li><a href="#filter=%3Anot(.transition)">not transition</a></li>
<li><a href="#filter=.metal%3Anot(.transition)">metal but not transition</a></li>
</ul>
The href value is a serialized string, suitable for a URL. These values can be created with jQuery.param().
$.param({ filter: '.metal' })
// >> "filter=.metal"
$.param({ filter: '.alkali, alkaline-earth' })
// >> "filter=.alkali%2C+alkaline-earth"
$.param({ filter: ':not(.transition)' })
// >> "#filter=%3Anot(.transition)"
jQuery script
These serialized href values can be converted into their proper jQuery object form when clicked using jQuery.deparam() from jQuery BBQ.
$('.option-set a').click(function(){
// get href attr, remove leading #
var href = $(this).attr('href').replace( /^#/, '' ),
// convert href into object
// i.e. 'filter=.inner-transition' -> { filter: '.inner-transition' }
option = $.deparam( href, true );
// set hash, triggers hashchange on window
$.bbq.pushState( option );
return false;
});
Calling $.bbq.pushState() will trigger the hashchange event. At that point, we can parse the hash from the URL and use it to trigger the proper change in the Isotope instance.
$(window).bind( 'hashchange', function( event ){
// get options object from hash
var hashOptions = $.deparam.fragment();
// apply options from hash
$container.isotope( hashOptions );
})
// trigger hashchange to capture any hash data on init
.trigger('hashchange');
Now any filter buttons that are clicked will update the URL hash, so these options can be bookmarked.