jquery this id return Undefined

Question

I have two asp radio buttons on a page that are placed in a updatepanel  I wrote a click event for them with jQuery like this     document  ready function              inputs   click function               alert   this  id                 But it returns Undefined  What is the problem   EDIT           alert   or       this  attr  id     alert this id     These two lines return null

User · Answer

use this actiion    document  ready function      var a   this id   alert  a

User · Answer

this   is the DOM Element   this    Jquery objct  which wrapped with Dom Element  you can check this answer also   this vs   this    try like this  Attr     Get the value of an attribute for the first element in the set of matched elements     document  ready function              inputs   click function               alert   or       this  attr  id

User · Answer

Another option  just so you ve seen it      function              inputs   click function  e             alert e target id                 HTH

User · Answer

this  and this aren t the same  The first represents a jQuery object wrapped around your element  The second is just your element  The id property exists on the element  but not the jQuery object  As such  you have a few options    Access the property on the element directly   this id Access it from the jQuery object     this  attr  id   Pull the object out of jQuery     this  get 0  id     Or   this  0  id Get the id from the event object   When events are raised  for instance a click event  they carry important information and references around with them  In your code above  you have a click event  This event object has a reference to two items  currentTarget and target   Using target  you can get the id of the element that raised the event  currentTarget would simply tell you which element the event is currently bubbling through  These are not always the same       button   on  click   function e   console log  e target id         Of all of these  the best option is to just access it directly from this itself  unless you re engaged in a series of nested events  then it might be best to use the event object of each nested event  give them all unique names  to reference elements in higher or lower scopes

User · Answer

Hiya demo http   jsfiddle net LYTbc   this is a reference to the DOM element  so you can wrap it directly   attr api  http   api jquery com attr   The  attr   method gets the attribute value for only the first element in the matched set   have a nice one  cheers   code    document  ready function              inputs   click function               alert this id            alert   or       this  attr  id

User · Answer

this  is a jQuery object that is wrapping the DOM element this and jQuery objects don t have id properties  You probably want just this id to get the id attribute of the clicked element

[jquery] jquery $(this).id return Undefined

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