类更改后，JQuery单击事件无法正常工作

Question

I have JQuery script similar to this:

$('.follow_link').click(function(){
  // Do some stuff
  $(this).removeClass();
  $(this).addClass("unfollow_link");
});

$('.unfollow_link').click(function(){
  // Do some stuff
  $(this).removeClass();
  $(this).addClass("follow_link");
});

My problem is that after I change the class the link is still refering to it's old class' click event. Is there a way of rebinding? Or am I doing this a bad way?

Answer 1

You can use this, both functions in 1:

$('.unfollow_link, .follow_link').live("click", function(){
    $(this).toggleClass("follow_link unfollow_link");
});

See toggleClass , and the live function

.toggleClass( className ) classNameOne or more class names (separated by spaces) to be toggled for each element in the matched set.

Edit for new jQuery versions 1.6.4+

Since the live function does not exists anymore, here is a replacement:

$('body').on("click", '.unfollow_link, .follow_link', function(){
    $(this).toggleClass("follow_link unfollow_link");
});

Answer 2

The problem is that jQuery works by selecting elements (that's what $('.follow_link') does) and then binding an event handler to those elements (that's what .click*function(){ does). It doesn't matter if the class changes.

Javascript has a feature called event bubbling. This means that ancestor elements are notified of events on their descendants. This means that you can test selectors when the event occurs, rather than on document ready.

jQuery makes this easy with the on function:

$(document.body).on('click', '.follow_link', function(){
  // Do some stuff
  $(this).removeClass();
  $(this).addClass("unfollow_link");
}).on('click', '.unfollow_link', function(){
  // Do some stuff
  $(this).removeClass();
  $(this).addClass("follow_link");
});

Note that this function was introduced in jQuery 1.7. For compatibility with previous versions, use delegate .

Answer 3

Note: I just had this issue even if the on() function and still have the issue on JQuery 1.10,

Actually I resolved the problem by replacing:

$('.unfollow_link, .follow_link').live("click", function(){
     $(this).toggleClass("follow_link unfollow_link");
});

By

$(document).on('click','.unfollow_link, .follow_link', function(){
    $(this).toggleClass("follow_link unfollow_link");
});

Answer 4

It would be better to give each of the links a third class that designates that they are part of a group. Something like a_link :

$('.a_link').bind('click', function () {
    $(this).toggleClass('follow_link unfollow_link');
});

Answer 5

Try:

 
 
 
  
  $('.follow_link, .unfollow_link').click(function() { newclass = $(this).hasClass('follow_link') ? 'unfollow_link' : 'follow_link'; $(this).removeClass().addClass(newclass) });
 
  

edit: Niels' solution is much nicer.