JQuery checkbox state not working

Question

can anyone tell me why this line isnt working? (i'm trying to access the value property of a checkbox and write it into my variable or otherwise if its not checked an empty string)

var ri_ort = $('#ri_ort').attr('checked')?$('#ri_ort').val():'';

Thx a lot

Answer 1

尝试的is ：

var ri_ort = $('#ri_ort').is(':checked') ? $('#ri_ort').val() : '';

Answer 2

In jQuery, you can check attributes like checked and disabled using the prop method:

$('#ri_ort').prop('checked'); // returns true or false

prop also can be used to set the value:

$('#ri_ort').prop('checked', false); // removes the `checked` attribute

Here is an example: http://jsfiddle.net/BeKa4/1/

Answer 3

As of jQuery 1.6, attr method doesn't return a boolean value, it returns undefined , you should use prop or is method instead:

var $elem = $('#ri_ort');
var ri_ort = $elem.prop('checked') ? $elem.val(): '';

Or if you want to listen to the change event:

$(function() {
   var ri_ort = '';
   $('#ri_ort').change(function(){
       ri_ort = this.checked ? this.value : '';
   })
})