4.9 KiB
Collect data from item element and rearrange their order in the layout with sorting.
Markup
Any group of similar items have their own data. It could be a text value, like a title or tag, or a numerical value, like a measurement or grade. For our example, each item element has several data points that can be used for sorting. There's the elemental symbol, number, name of the element, weight, and category.
{% highlight html %}
79
Au
Gold
196.966569
51
Sb
Antimony
121.76
{% endhighlight %}
getSortData option
In order to extract this data from the element, we need to pass in a function to get it via the getSortData option. This option accepts an object, whose values are the functions to extract the data.
Each function receives one argument, which represents a jQuery object for each item element. With that argument, the function needs to return the data point.
In the example above, to get element name, we would need to get the text from the .name element. The same works for symbol.
{% highlight javascript %}
$('#container').isotope({ getSortData : { name : function ( $elem ) { return $elem.find('.name').text(); }, symbol : function ( $elem ) { return $elem.find('.symbol').text(); } } });
{% endhighlight %}
For numerical data, we can convert a text value into a number via parseInt() function.
{% highlight javascript %}
getSortData : { // ... number : function ( $elem ) { return parseInt( $elem.find('.name').text(), 10 ); }, weight : function ( $elem ) { return parseInt( $elem.find('.weight').text(), 10 ); } }
{% endhighlight %}
The data extracted can be anything accessible in the item element via jQuery. To extract the category data held within the data-category attribute, we can use the .attr().
{% highlight javascript %}
getSortData : { // ... category : function ( $elem ) { return $elem.attr('data-category'); } }
{% endhighlight %}
Get creative! You can sort the list in the index page by the width of each item element.
{% highlight javascript %}
getSortData : { // ... width : function( $elem ) { return $elem.width(); } }
{% endhighlight %}
sortBy option
For every method set in getSortData, Isotope uses that method to build the data for sorting. The data cache is built on initialization so it can be quickly accessed when sorting. With the methods above, we have built data for an item elements name, symbol, number, weight and category.
Sorting elements is done with the sortBy option. The value needs to match the property name used in the getSortData object.
With our example, we can use 'name', 'symbol', 'number', 'weight' and 'category'.
{% highlight javascript %}
$('#container').isotope({ sortBy : 'symbol' });
{% endhighlight %}
There is an additional sorting data built in to Isotope 'original-order'. Sorting with 'original-order' will use the original order of the item elements to arrange them in the layout.
sortAscending option
By default, Isotope sorts data in ascension. If our data for name is "Gold, Antimony, Lead, Iron, Silver", when sorted by name, the elements will be ordered ABC.. : "Antimony, Gold, Iron, Lead, Silver." To reverse the order and sort data in descension, set sortAscending to false.
{% highlight javascript %}
$('#container').isotope({ sortBy : 'name', sortAscending : false });
{% endhighlight %}
Creating interactive buttons
We can use a simple list for our buttons.
{% highlight html %}
{% endhighlight %}
When one of these links is clicked, we can use the href attribute as the value for sortBy in the Isotope script.
{% highlight javascript %}
$('#sort a').click(function(){ // get href attribute, minus the '#' var sortName = $(this).attr('href').slice(1); $('#container').isotope({ sortBy : sortName }); return false; });
{% endhighlight %}