jQuery get id of element by searching for it by class

This is my html :

<div id="my_box_one" class="head-div">
   <div>
       <div class="some_b开发者_开发技巧ox">a</div>
       <div class="some_box">b</div>
    </div>
</div>

I want to get the ID of the parent div("#my_box_one") using the class of that div(".head-div")

$(document).ready(function(){

$(".some_box").click(function(){
   var abc = $(this).parentsUntil(".head-div").attr("id");
   // also tried $(this).parent(".head-div") -- same effect
   alert(abc); // Shows as Undefined
});   

});

I can do the following and it will work okay, but it doesn't seem right.

var abc = $(this).parent("div").parent("div").attr("id");

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You can use .closest( selector ), for example:

var abc = $(this).closest(".head-div").attr("id");

http://api.jquery.com/closest/

.parent( selector ) selects only immediate parent of the element.

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parentsUntil gets all the parent elements until the one matched by the selector. It does not include the element matched. You're trying to get the id of the intervening div, which is obviously undefined.

You need to use closest, which goes up the DOM tree until it finds an element matching the selector, then returns only that element:

var abc = $(this).closest(".head-div").attr("id");

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Edit: for extra speed, but less flexibility in the event that you change your markup, you could use the parentNode property:

var abc = this.parentNode.parentNode.id;