Check and Uncheck Checkbox Dynamically with jQuery : bug?

问题

I made a script in order to control master & slave checkboxes (automatic checking and unchecking).

Here is my JS :

$(document).ready(function() {

    $('#myCheck').click(function() {
        $('.myCheck').attr('checked', false);
    });
    $('.myCheck').click(function() {
        if ($('.myCheck').is(':checked')) {
            $('#myCheck').attr('checked', false);
        } else {
            $('#myCheck').attr('checked', true); // IT DOESN'T WORK, WHY ?
            alert("Checkbox Master must be checked, but it's not!");
        }
    });

});

And here is my HTML :

<input type="checkbox" id="myCheck" checked="checked" />&nbsp;&nbsp;Checkbox Master<br />
<input type="checkbox" class="myCheck" value="1" />&nbsp;&nbsp;Checkbox Slave 1<br />
<input type="checkbox" class="myCheck" value="1" />&nbsp;&nbsp;Checkbox Slave 2

Look at my simple JsFiddle to understand the problem.

EDIT 1 : Like Inser said, the problem happens with jQuery 1.9.2 and over. No more problem with jQuery 1.8.3. Strange...

EDIT 2 : Inser found the solution, use .prop('checked', true) instead .attr('checked', true). Look at the comments below...

回答1:

Use prop method for new versions of jQuery:

$('#myCheck').prop('checked', true);
$('#myCheck').prop('checked', false);

http://jsfiddle.net/uQfMs/37/

回答2:

You could try this.

$('#myCheck').click(function() {
    var checkBoxes = $(this).siblings('input[type=checkbox]');
    checkBoxes.prop('checked', $(this).is(':checked') ? true : false);
});

回答3:

Maybe you just want to check the master checkbox:

$('#myCheck').click(function() {
       $('.myCheck').attr('checked', false);
       $(this).attr('checked', true);
});

see this fiddle.

回答4:

i made some experiences , actually $(':checkbox').attr('checked',false); althought this could set the "checked" attribute , but it won't continuesly shows in the visual . and $(':checkbox').prop('checked', true); this one works perfectly! hope this could do some help .

回答5:

I wrote you a plugin for this:

$.fn.dependantCheckbox = function() {
  var $targ = $(this);
  function syncSelection(group, action) {
    $targ.each(function() {
      if ($(this).data('checkbox-group') === group) {
        $(this).prop('checked', action);
      }
    });
  };
  $('input[type="checkbox"][data-checkbox-group]').on('change', function() {
    var groupSelection = $(this).data('checkbox-group');
    var isChecked = $(this).prop('checked');
    syncSelection(groupSelection, isChecked);
  });
}
$('input[type="checkbox"][data-checkbox-group]').dependantCheckbox();


<input data-checkbox-group="1" type="checkbox" id="test" />
<label for="test">test</label>
<input data-checkbox-group="1" type="checkbox" id="test2" />
<label for="test2">test2</label>
<input data-checkbox-group="2" type="checkbox" id="test3" />
<label for="test3">test3</label>
<input data-checkbox-group="2" type="checkbox" id="test4" />
<label for="test4">test4</label>

http://codepen.io/nicholasabrams/pen/mJqyqG

来源：https://stackoverflow.com/questions/15474759/check-and-uncheck-checkbox-dynamically-with-jquery-bug

标签

jquery

checkbox