Question

我有一个包含16个复选框的表单。我正在尝试跟踪已检查的框的数量并在表单下方提供即时反馈，但我无法在更改时更新numSelected变量。

这是我的剧本：

$(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");
});
});

这是我放在一起的jsfiddle，感谢任何帮助！

Answer 1

检查提供的插件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

不确定是否存在负数剩余数字，但由于这似乎偏离主题，我会将业务逻辑留给您。 =]

Answer 2

试试这个：

$('.image-checkbox').change(function() {
    var numSelected = $("input:checkbox:checked").length;
    alert(numSelected);
});

Jquery。不更新字段

2 个答案: