Javascript addClass removeClass无法按需工作

Question

When I click on the icon, I want it to be switched on/off.

In my html file I have:

<div class="startSharing"></div>

And in my js:

$('.startSharing').click(function() {
    $(this).removeClass('startSharing');
    $(this).addClass('stopSharing');
});

$('.stopSharing').click(function() {
    $(this).removeClass('stopSharing');
    $(this).addClass('startSharing');
});

It works fine when switching from on to off - but I don't understand why it still goes into "startSharing" section when it is turned off.

Thank you for help.

Answer 1

In this case, you're setting the handlers to the particular elements. Once they're set - they're set, regardless of the selector changing.

You could just define it on the .startSharing element, if they all start like that. Then, you could use .toggleClass() to easily switch them on/off:

$('.startSharing').click(function() {
    $(this).toggleClass('startSharing stopSharing');
});

Answer 2

You may also delegate the click event like this:

$('body').on('click', '.startSharing', function() {
  $(this).removeClass('startSharing').addClass('stopSharing');
});

$('body').on('click', '.stopSharing', function() {
  $(this).removeClass('stopSharing').addClass('startSharing');
});

Doing it this way will also allow dynamically-generated to trigger events. In your case, .stopSharing was generated dynamically.

Answer 3

use event delegation

 $('#container').on('click',".startSharing,.stopSharing",function(){ $(this).toggleClass('startSharing').toggleClass('stopSharing'); }); 

 #container div { width: 250px; height: 100px; } .startSharing { background-color: green; } .startSharing::after { content: "start sharing"; } .stopSharing { background-color: red; } .stopSharing::after { content: "stop sharing"; } 

 <script src="https://ajax.googleapis.com/ajax/libs/jquery/2.1.1/jquery.min.js"></script> <div id="container"> <div class="startSharing"></div> </div>