如何使用原型获取锚标记的父ID？

Question

Event.observe(window, 'load',
function() { 

    $$('a.tag_links').each(function(s) {
        //alert(s.parent.parent.id); //How to get id of its parent to parent
    });
}
);

我想获得父元素的id.

结构是这样的.

 <div class="home-page" id='entity-1'>
    <div class="index-page-category">

    <a href="/entities/category/food" class="tag_links">food</a>

</div>

结果应该是entity-1

Answer 1

像这样:

    $$('a.tag_links').each(function(s) {
        var parentid = $(s).up('div').id;
    });