本文介绍了如果选中收音机，则需要输入字段的处理方法，对大家解决问题具有一定的参考价值，需要的朋友们下面随着小编来一起学习吧！
问题描述
Can I somehow insert the required attribute into an input field only if a certain radio is checked?
I have an input field named "ladder-meters" that is not required to be filled per default. But if the user checks a radio button that is named "ladder" the "ladder-meters" field are required to be filled.
My input looks like this:
<input type="text" name="ladder-meters" id="ladder-meters">
and should like this at the onchange event on the radio
<input type="text" name="ladder-meters" id="ladder-meters" required>
解决方案
Easy to achieve with jQuery:
$('#ladder').change(function () {
if($(this).is(':checked') {
$('#ladder-meters').attr('required');
} else {
$('#ladder-meters').removeAttr('required');
}
});
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