jQuery detect event in appended element

I am trying to detect an event in a jQuery appended element.

• How do you do 开发者_如何学编程this,
• and/or why isn't this working:

Here's a simplified snippet of what I've tried. The input field fires after clicking "click me." After clicking on the input, the alert isn't firing - other events on this appended input don't fire either. :-(

The following's in script tags:

$(document).ready(function(){   
  $(".clickme").click(function(){$(".extra").append('write: <input type="text" class="writesomething" />');});
  $("input").click(function(){alert("clicked")});
});

The following's in the body:

<a href="#" onclick="return false" class="clickme">click me</a>
<div class="extra"></div>

Do it like this:

Try it out: http://jsfiddle.net/eDDeZ/1/

$(".clickme").click(function(){
    $('<input type="text" class="writesomething" />') 
             .click(function(){alert("clicked")})
             .appendTo('.extra')
             .before('write: ');
});

You're creating the new element, assigning the click handler directly to it, appending it to .extra, then adding the write: text before it.

No need for .live() this way.

EDIT:

Another option is to use .delegate() which will be more efficient that .live() since it is focused on a particular container instead of the entire page.

Try it out: http://jsfiddle.net/eDDeZ/2/

$(".clickme").click(function(){
    $('.extra').append('write: <input type="text" class="writesomething" />') 
});

$('.extra').delegate('input','click',function(){alert("clicked")});

• http://api.jquery.com/delegate/

The binding of the second event handler occurs when the DOM is loaded - and no matching element exists. When you click the link, an element is added but no event handler is attached to it.

There are three ways to solve this:

1. Use the .live() api instead of .click()

   $('input').live('click', function() { alert('clicked'); });
   

2. Add the event handler in the click event.

   $(document).ready(function(){   
       $(".clickme").click(function() {
           $(".extra").append('write: <input type="text" class="writesomething" />');
           $("input").click(function(){ alert("clicked") });
       });
   });
   

3. Or, similar, but making use of jQuery chaining

   $(document).ready(function() {
       $('.clickme').click(function() {
           $('<input>')
               .attr('type','text')
               .addClass('writesomething')
               .click(function() { alert('clicked!'); })
               .appendTo('.extra');
       });
   });
   

use the method live to dynamically bind events with elements instead of using bind.

For example :

$("input").live('click',function(){alert("clicked")});