Question:

I have a category listing which some categories have children, I am trying to create a ALL category that when clicked, will check all sibling checkboxes in that same category.

e.g; clicking ALL underneath the MUSIC category would check blues, jazz, rock n roll

Code:

HTML:

<ul name="events-categories" id="events-categories">
    <li><input type="checkbox" name="category-events" value="185" placeholder="" id="category-185" class="events-category"> CONVENTIONS
        <ul class="event-children">
            <li><input type="checkbox" name="child-category-all" value="" class="events-child-category-all">ALL</li>
            <li><input type="checkbox" name="child-category-190" value="190" id="child-category-190" class="child events-child-category">SCIENCE</li>
            <li><input type="checkbox" name="child-category-191" value="191" id="child-category-191" class="child events-child-category">TECHNOLOGY</li>
        </ul>
    </li>
    <li><input type="checkbox" name="category-events" value="184" placeholder="" id="category-184" class="events-category"> MUSIC
        <ul class="event-children">
            <li><input type="checkbox" name="child-category-all" value="" class="events-child-category-all">ALL</li>
            <li><input type="checkbox" name="child-category-189" value="189" id="child-category-189" class="child events-child-category">BLUES</li>
            <li><input type="checkbox" name="child-category-188" value="188" id="child-category-188" class="child events-child-category">JAZZ</li>
            <li><input type="checkbox" name="child-category-187" value="187" id="child-category-187" class="child events-child-category">ROCK N ROLL</li>
        </ul>
    </li>
    <li><input type="checkbox" name="category-events" value="186" placeholder="" id="category-186" class="events-category"> TRIBUTES</li>
</ul>?

CSS:

.event-children {
    margin-left: 20px;
    list-style: none;
    display: none;
}?

jQuery So Far:

/**
 * left sidebar events categories
 * toggle sub categories
 */
$('.events-category').change( function(){
    console.log('showing sub categories');
    var c = this.checked;
    if( c ){
        $(this).next('.event-children').css('display', 'block');
    }else{
        $(this).next('.event-children').css('display', 'none');
    }
});

$('.events-child-category-all').change( function(){
    var c = this.checked;
    if( c ){
        $(this).siblings(':checkbox').attr('checked',true);
    }else{
        $(this).siblings(':checkbox').attr('checked',false);
    }
});?

jsfiddle: http://jsfiddle.net/SENV8/