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Is there a way to automatically add classes to multilevel lists using jQuery?

I have multilevel lists like this:

<ul>
    <li>Item 1
        <ul>
            <li>Item 1 1st Child
                <ul>
                    <li>Item 1 1st Grandchild
                        <ul>
                            <li>Item 1 Grand Grandchild</li>
                        </ul>
                    </li>
                    <li>Item 1 2nd Grandchild</li>
                    <li>Item 1 3rd Grandchild</li>
                </ul>
            </li>
            <li>Item 1 2nd Child</li>
            <li>Item 1 3rd Child</li>
        </ul>
    </li>
    <li>Item 2</li>
</ul>

I want everyone to li

have a "level" class according to their positions. The result will be like this:

<ul>
    <li class="level-1">Item 1
        <ul>
            <li class="level-2">Item 1 1st Child
                <ul>
                    <li class="level-3">Item 1 1st Grandchild
                        <ul>
                            <li class="level-4">Item 1 Grand Grandchild</li>
                        </ul>
                    </li>
                    <li class="level-3">Item 1 2nd Grandchild</li>
                    <li class="level-3">Item 1 3rd Grandchild</li>
                </ul>
            </li>
            <li class="level-2">Item 1 2nd Child</li>
            <li class="level-2">Item 1 3rd Child</li>
        </ul>
    </li>
    <li class="level-1">Item 2</li>
</ul>

Is there a way to achieve this using jQuery?

Thank you very much for your attention.

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4 answers


Think this is a generic solution:



var current = $('ul:first');
var depth = 1;

while (current.length) {
  current = current.children('li').addClass('level-' + depth++).children('ul');
};
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Not the fastest due to DOM traversal, but you can do it with just:

​$("​​​li").each(function() {
   $(this).addClass("level-" + ($(this).parents("li").length+1)); 
});​​​


You can see a working example here

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Assuming you only have 4 levels of lists

$("ul > li").addClass("level-1"); 
$("li.level-1 > ul > li").addClass("level-2"); 
$("li.level-2 > ul > li").addClass("level-3"); 
$("li.level-3 > ul > li").addClass("level-4");

There might be a more programmatic way to do this and allow arbitrary depth, but it was fast.

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I'll play ... you can always make it recursive :)

$(function() {
    addLevel($('ul:first'));
});

function addLevel($ul, level) {
    ( ! level ) ? level = 1 : level += 1;
    $ul.children('li').each(function() {
        $(this).addClass('level-' + level);
        $(this).children('ul').each(function() { addLevel($(this), level) });
    });
}
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