在Javascript中选择单选按钮时清除文本框字段 [英] Clearing a textbox field when a radio button is selected in Javascript

问题描述

我有一个Web表单，该表单允许用户使用预定义的单选按钮来捐款，并为其分配一个值(所有数字均不同).我也有一个自己选择的金额文本字段，他们可以用自己希望捐赠的自定义金额编写.如果用户选择了预定义的选项，我想清除自定义文本字段.

I have a web form which allows users to donate money using the predefined radio buttons with a value assigned to them (all different numbers). I also have a choose your own amount textfield which they can write in a custom amount they wish to donate. I want to clear the custom textfield if a user selects a predefined choice.

到目前为止，我已经创建了这个:

So far I have created this:

HTML:

<input type="radio" name="am_payment" value="3" checked="checked"> <strong>64</strong>
<input type="radio" name="am_payment" value="11" checked="checked"> <strong>100</strong>
<input type="radio" name="am_payment" value="32" checked="checked"> <strong>250</strong>
<input type="radio" value="" name="am_payment"><label>Other</label>
<input type="text" name="CP_otheramount" value="" id="theamount" disabled="disabled"/>

JAVASCRIPT:

$('input[name="am_payment"]').on('click', function() {
   if ($(this).val() === '') {
      $('#theamount').removeProp("disabled");
   }
   else {
      $('#theamount').prop("disabled", "disabled");
      $('input[name="CP_otheramount"]').val("");
   }
});

但是基于value=""的value === true似乎并不正确.

But basing it on a value === true for value="" just doesn't seem right.

有没有办法改善这一点?

Is there a way to improve this?

谢谢

推荐答案

要禁用/启用元素，您需要将Disabled属性的值设置为true/false，因此删除该属性不起作用，因此您需要

To disable/enable an element you need to set the value of the disabled property to true/false, removing the property doesn't work so you need

>

$('input[name="am_payment"]').on('click', function() {
  if ($(this).val() === '') {
    $('#theamount').prop('disabled', false);
  } else {
    $('#theamount').prop("disabled", true).val('');
  }
});

<script src="https://ajax.googleapis.com/ajax/libs/jquery/2.1.1/jquery.min.js"></script>
<input type="radio" name="am_payment" value="3" checked="checked"> <strong>64</strong>

<input type="radio" name="am_payment" value="11" checked="checked"> <strong>100</strong>

<input type="radio" name="am_payment" value="32" checked="checked"> <strong>250</strong>

<input type="radio" value="" name="am_payment">
<label>Other</label>

<input type="text" name="CP_otheramount" value="" id="theamount" disabled="disabled" />

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