按元素类别获取ID

Question

I have several text boxes which have drop downs on them. When a user clicks on the field with the drop down class, I want to get the ID of that field. This seems like it should be simple, but I can't quite seem to figure it out...

I have tried:

$(".dropdown").click(function () {
    alert(this.getElementById);
});

Yet this only returns undefined.

Answer 1

ID is a property of the object, so just use following code:

$(".dropdown").click(function () {
    alert(this.id);
});

Answer 2

Wrong syntax.You have to write

$(".dropdown").click(function () {
    alert(this.id);
});

Correct Syntax:

var idStr = element.id; // Get the id.
element.id = idStr; // Set the id

Answer 3

You're using getElementById incorrectly. It's a function used to get a dom element on your page using an id as filter condition. It's not used to get element id.

Correct usage of getElementById is

var elem = document.getElementById('theid');

You simply have to use

alert(this.id);

Answer 4

If I understood well, you want this:

$(".dropdown").click(function () {
    alert($(this).attr('id'));
});

correct me if I am wrong

Answer 5

Its simple you can alert the element id with the below code written by me

          $(".dropdown").click(function() {

          var id = $('.dropdown').attr('id');
          alert(id);

         });