使用Jquery添加没有值的HTML属性

Question

I want to add an attribute to a HTML element without a value using JQuery

<input id="r1" type="radio name="r1" value="1">

Add required

<input id="r1" type="radio name="r1" value="1" required>

How can this be done without the ="" after the attribute?

Answer 1

The standard practice would be to set the property to true

$("#r1").prop("required", true);

This actually results in markup that exactly reads

<input id="r1" required>

JSFiddle demo: http://jsfiddle.net/8SrED/