如果选中无线电，则需要输入字段 [英] make a input field required if radio is checked

问题描述

只有在选中某个收音机时，我才能以某种方式将所需属性插入输入字段吗？

Can I somehow insert the required attribute into an input field only if a certain radio is checked?

我有一个名为ladder-meters的输入字段，即默认情况下不需要填写。但是，如果用户检查名为梯形图的单选按钮，则需要填写梯形表字段。

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.

我的输入如下所示：

<input type="text" name="ladder-meters" id="ladder-meters">

并且应该在收音机的onchange事件中这样做

and should like this at the onchange event on the radio

<input type="text" name="ladder-meters" id="ladder-meters" required>

推荐答案

使用jQuery轻松实现：

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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