Jquery toggle event is messing with checkbox value

问题:

I'm using Jquery's toggle event to do some stuff when a user clicks a checkbox, like this:

$('input#myId').toggle(
function(){
//do stuff  
},
function(){
//do other stuff    
}
);

The problem is that the checkbox isn't being ticked when I click on the checkbox. (All the stuff I've put into the toggle event is working properly.)

I've tried the following:

$('input#myId').attr('checked', 'checked');

and

$(this).attr('checked', 'checked');

and even simply

return true;

But nothing is working. Can anyone tell me where I'm going wrong?

Edit - thanks to all who replied. Dreas' answer very nearly worked for me, except for the part that checked the attribute. This works perfectly (although it's a bit hacky)

$('input#myInput').change(function ()
{
    if(!$(this).hasClass("checked"))
    {
        //do stuff if the checkbox isn't checked
        $(this).addClass("checked");
        return;
    }

    //do stuff if the checkbox isn't checked
    $(this).removeClass('checked');
});

Thanks again to all who replied.

回答1:

Use the change event instead of the toggle event, like such:

$('input#myId').change(function () {
    if ($(this).attr("checked")) {
        //do the stuff that you would do when 'checked'

        return;
    }
    //Here do the stuff you want to do when 'unchecked'
});

回答2:

While using the change event handler suggested by Dreas Grech is appropriate, it doesn't work well in IE 6 & 7, which doesn't fire the change event until the focus is blurred (that is, until you click outside the area of the checkbox). As QuirksMode say, "it's a serious bug".

You might want to use the click event handler, but that won't work with keyboard navigation. You need to register a keyup handler too...

See also this related question.

I haven't yet found a good cross-browser solution that supports both mouse clicks and keyboard activation of the checkboxes (and doesn't fire too many events).

---

Regarding your solution for checking whether the checkbox is checked or not, instead of adding your own checked class, you may use HTML's checked attribute:

$('input#myInput').change(function () {
    if ($(this).attr("checked")) {
        //do stuff if the checkbox is checked
    } else {
        //do stuff if the checkbox isn't checked
    }
});

Any browser sets the checked attribute of an input element to the value "checked" if the checkbox is checked, and sets it to null (or deletes the attribute) if the checkbox is not checked.

回答3:

why not using $.is() ?

$('input#myId').change(
    function() {
        if ($(this).is(':checked')) {
            // do stuff here 
        } else {
            // do other stuff here
        }
});

回答4:

This is an answer by MorningZ (I found it here) that makes totally sense:

The part you are missing is that "checkbox" is a jQuery object, not a checkbox DOM object

so:

checkbox.checked sure would error because there is no .checked property of a jQuery object

so:

checkbox[0].checked would work since the first item on a jQuery array is the DOM object itself.

So in your change() function you can use

$(this)[0].checked

回答5:

$('input#myId').toggle(
  function(e){
    e.preventDefault();
    //do stuff      
    $(this).attr('checked', 'true');
  },
  function(e){
    e.preventDefault();
    //do other stuff        
    $(this).attr('checked', 'false');
  }
);

回答6:

this worked for me............ check it

$(":checkbox").click(function(){
if($(this).attr("id").split("chk_all")[1])
 {
  var ty  = "sel"+$(this).attr("id").split("chk_all")[1]+"[]";
  if($(this).attr("checked"))
   {
    $('input[name="'+ty+'"]').attr("checked", "checked");
   }
  else
   {
    $('input[name="'+ty+'"]').removeAttr("checked");
   }
 }
})

回答7:

I did a similar approach but simply using the checked attribute such as

 //toggles checkbox on/off
    $("input:checkbox").change(
        function(){
           if(!this.checked){
             this.checked=true;
           }
           else{
             this.checked=false;
           }
         }
       );
 //end toggle

回答8:

    $("input[type=checkbox][checked=false]")// be shure to set to false on ready
    $("input#Checkbox1").change(function() {
        if ($(this).attr("checked")) {
            $("#chk1").html("you just selected me")//the lable
        } else {$("#chk1").html("you just un selected me") }    
    });

回答9:

Try using a non-jquery function:

function chkboxToggle() {
  if ($('input#chkbox').attr('checked'))
    // do something
  else
    // do something else
}

then in your form:

<input id="chkbox" type="checkbox" onclick="chkboxToggle()" />

回答10:

Try:

$(":checkbox").click(function(){
  if($(this).attr("checked"))
   {
    $('input[name="name[]"]').attr("checked", "checked");
   }
  else
   {
    $('input[name="name[]"]').removeAttr("checked");
   }
})