如何使用jQuery从元素获取属性的ID？

Question

i wrote this mini jquery snippet, but i want to get the id of the li element so i can post this data to an ajax call this is my script

 $('#list li a').on('click', function(e) {

        var id = ? //need to get li id
        e.preventDefault();

        $.ajax({
        type: "POST",
        url: "unfollow.php",
        data: id,
        success: function(){
            $(this).parent().hide();
        $('.updateNumber').html(function(){
            return parseInt($(this).text(),10)+1;
          });
        }
         });
       });
    });

this is an example html list:

<ul id="list">
    <li id="list_1" class="list"><a href="">hide</a></li>
</ul>

thanks :)

Answer 1

 $('#list li a').on('click', function(e) {
    var id = $(this).parent("li").attr("id");
    e.preventDefault();

    $.ajax({
    type: "POST",
    url: "unfollow.php",
    data: id,
    success: function(){
        $(this).parent().hide();
    $('.updateNumber').html(function(){
        return parseInt($(this).text(),10)+1;
      });
    }
     });
   });
});

• see http://api.jquery.com/attr/
• see http://api.jquery.com/parent/

Answer 2

You could use plain javascript (no need for the extra calls to jQuery)

var id = this.parentNode.id 

fiddle here http://jsfiddle.net/rL29r/

EDIT - to get just the number

var id = this.parentNode.id.replace('list_', '')

http://jsfiddle.net/rL29r/2/

Answer 3

由于您要匹配的<a>元素是<li>元素的后代，并且您似乎想要祖先<li>元素的id ，因此可以使用close（）方法：

var id = $(this).closest("li").attr("id");

Answer 4

id = this.parentNode.id;

This is at least 8 times faster than the jQuery equivalent. Don't use jQuery for something so simple.

Answer 5

Check this demo on jsFiddle.net. You will need to use .parent() with $(this) .

HTML

<ul id="list">
  <li id="list_1">
    <a href="#">Test Anchor One</a>
  </li>
  <li id="list_2">
    <a  href="#">Test Anchor Two</a>
  </li>
</ul>​

JavaScript

$('#list li a').on('click', function(e) {
    var id = $(this).parent().attr("id").replace("list_", "");
   alert(id);
});​

This will give 1 or 2 as id . Hope this helps you.

Answer 6

For the number of list_n use

var id = this.parentNode.id;
var number = id.substring(5);