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javascript - Sorting <li> tags

I have a a and I would like to sort my list alphabetically (I don't want caps to matter) according to a class named "name". How would I do this?

<ul class="column">
  <li>
    <table>
      <tr>
        <td class="name" >Name of Item</td>
      </tr>
      <tr>
        <td>Content</td>
      </tr>
      <tr>
        <td>morecontent</td>
        <td>morecontent</td>
      </tr>
    </table>
  </li>
  <li>
    <table>
      <tr>
        <td class="name" >Another name of item</td>
      </tr>
      <tr>
        <td>Content</td>
      </tr>
      <tr>
        <td>morecontent</td>
        <td>morecontent</td>
      </tr>
    </table>
  </li>
</ul>

Thanks

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1 Answer

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Using jQuery, this should do it:

function sort() {
    $($('ul.column>li').get().reverse()).each(function(outer) {
        var sorting = this;
        $($('ul.column>li').get().reverse()).each(function(inner) {
            if($('td.name', this).text().localeCompare($('td.name', sorting).text()) > 0) {
                this.parentNode.insertBefore(sorting.parentNode.removeChild(sorting), this);
            }
        });
    });
}

The above is a little dense though, so if you want to understand what's going on, let's break it down line-by-line:

function sort() {

    //get each <li> which is a child of <ul class="column">
    //for each element in the results, execute a function
    //also, we reversed the order (e.g. start at the bottom and go up
    $($('ul.column>li').get().reverse()).each(function(outer) {

        //this is the current <li> we're running against
        var sorting = this;

        //get the same set of elements again in their current state,
        //so we can figure out where to put this one
        $($('ul.column>li').get().reverse()).each(function(inner) {

            //get the inner text of the <td class="name">
            //for the item we're trying to replace,
            //and for the current item in the inner loop
            //use localeCompare to compare the two strings alphabetically
            if($('td.name', this).text().localeCompare($('td.name', sorting).text()) > 0) {

                //if the one we're trying to sort goes after the current one
                //alphabetically, remove it from its current position
                //and insert it after the current one
                this.parentNode.insertBefore(sorting.parentNode.removeChild(sorting), this);
            }
        });
    });
}

We can make it a little more reusable by passing in the selector for the list and the key:

sort('ul.column>li', 'td.name');

function sort(list, key) {
    $($(list).get().reverse()).each(function(outer) {
        var sorting = this;
        $($(list).get().reverse()).each(function(inner) {
            if($(key, this).text().localeCompare($(key, sorting).text()) > 0) {
                this.parentNode.insertBefore(sorting.parentNode.removeChild(sorting), this);
            }
        });
    });
}

Do keep in mind this requires jQuery, so you'll need a reference to it in your <head>:

<script src="http://ajax.googleapis.com/ajax/libs/jquery/1.3.2/jquery.min.js"></script>

And this function should be called at some point in the page after the list is written in the HTML.


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