Javascript 为什么单击复选框不会添加属性 checked='checked'
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Why clicking on checkbox does not add the attribute checked='checked'
提问by felix
When I click a checkbox, why does checked attribute is not getting added?. You can see the code here
http://jsfiddle.net/FCrSg/
当我单击一个复选框时，为什么没有添加已选中的属性？。你可以在这里看到代码
http://jsfiddle.net/FCrSg/
采纳答案by PetersenDidIt
What are you trying to do? Find out if its checked?
你想做什么？看看它是否被检查？
$('.user_roles').click(function(){
console.log( $(this).is(':checked'));
});
回答by David Tang
The HTML attributecheckedmeans: checked by default, when the page loads. This won'tchange when the checkbox is clicked.
在HTML属性checked方法：检查默认情况下，页面加载时。单击复选框时，这不会改变。
<input type="checkbox" checked="checked"> <!-- The HTML attribute -->
The DOM propertycheckedis actually the current state of the checkbox and is either true/false. This willchange when the checkbox is clicked, but isn't visible when you inspect the HTML.
该DOM属性checked实际上是复选框的当前状态，要么是真/假。单击复选框时，这将更改，但在检查 HTML 时不可见。
$('input:check')[0].checked == true;
// Whether or not the checkbox is currently checked
回答by user113716
If you want to see it appear on the element displayed in the console, use the native setAttribute()method.
如果您想看到它出现在控制台中显示的元素上，请使用本机setAttribute()方法。
Example:http://jsfiddle.net/FCrSg/2/
示例：http : //jsfiddle.net/FCrSg/2/
this.setAttribute('checked',this.checked);
So it would look like this:
所以它看起来像这样：
$('.user_roles').click(function(){
this.setAttribute('checked',this.checked);
console.log( $(this) );
});
Then the console should give you:
然后控制台应该给你：
<input class=?"user_roles" type=?"checkbox" checked=?"true">?
Though you normally wouldn't need the attribute set like that. Typically the property is enough.
尽管您通常不需要这样设置的属性。通常属性就足够了。
