javascript - Jquery .change 不更新字段

Question

我有一个包含 16 个复选框的表单。我正在尝试跟踪选中的框的数量并在表单下方提供即时反馈，但我无法让 numSelected 变量根据更改进行更新。

这是我的脚本:

$(document).ready(function () {
// the jQuery.iCheck library wraps the input in a div for styling   
$('input').iCheck({
    checkboxClass: 'icheckbox_square-red'
});

// count the checkboxes
var cb = $(":checkbox"),
    numSelected = 0,
    numLeft = 2 - parseInt(numSelected, 10);
$(cb).change(function () {
    //alert("a checkbox was checked!");
    var $this = $(this);         
    var numSelected = $this(':checked').length;
    $('#status-box').html("Out of "+$this.length+" images you have selected "+numSelected+" for processing, you have "+numLeft+" remaining");
});
});

这是一个jsfiddle我放在一起，任何帮助表示赞赏!

Answer 1

检查插件提供的 callbacks API .所以基本上使用 ifToggled 回调:

var $cb = $('input:checkbox');
$cb.iCheck({
    checkboxClass: 'icheckbox_square-red'
}).on('ifToggled', function() {
    var numSelected = $cb.filter(':checked').length,
        numLeft = 2 - numSelected;
    $('#status-box').html("Out of "+$cb.length+" images you have selected "+numSelected+" for processing, you have "+numLeft+" remaining");
});

Fiddle

不确定负剩余数是否有意为之，但由于这似乎离题，我将把业务逻辑部分留给您。 =]