检测复选框状态更改 [英] detect checkbox state change

问题描述

我想检测用户是否选中或取消选中iframe中的复选框，并设置类似的标志.但是它似乎没有按预期工作.关于代码错误的任何指针吗?

I want to detect if user checks or unchecks a check box within an iframe and set a flag like so. But it does not seem to work as expected. Any pointers on the error on the code?

jQuery("#frameName").contents().find(":checkbox").bind('change', function(){        
            val = true;
            alert("changed");
    });

但是我可以检测是否通过使用复选框选中了

But I can detect if a checkbox is checked by using

var val = jQuery("#frameName").contents().find(":checkbox").is(":checked");

我希望能够检测到复选框上的任何状态变化并设置标志.

I want to be able to detect any state change on a checkbox and set the flag.

推荐答案

使用checked DOM属性检查是否选中了复选框.即使选中该复选框，也会始终在更改时触发change事件.

Use the checked DOM property to check whether a checkbox is checked or not. The change event is always triggered on change, even if the checkbox gets unchecked.

jQuery("#frameName").contents().find(":checkbox").bind('change', function(){        
        val = this.checked; //<---
        alert("changed");
});

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