禁用 <选择>在另一个 &lt;select&gt; 中选择时的选项盒子 [英] Disable &lt;select&gt; option when selected in another &lt;select&gt; box

问题描述

我在 php mail() 表单中有一组 16 个选择框，如果在任何其他框中选择了某个选项，我想禁用该选项.选择框中的选项顺序不一样，我需要php邮件的值.我希望填写表单的用户不能选择相同的选项两次或更多次.

I've got a group of 16 select boxes in a php mail() form, and I want to disable an option if it's chosen in any other box. The order of options in the select boxes aren't the same, and the I need the value for the php mail. I want the user filling in the form to not be able to choose the same option twice or more.

<select name="box1" id="box1">
    <option value="One">One</option>
    <option value="Two">Two</option>
    <option value="Three">Three</option>
</select>

<select name="box2" id="box2">
    <option value="Two">Two</option>
    <option value="One">One</option>
    <option value="Three">Three</option>
    <option value="Life">Life</option>
</select>

<select name="box3" id="box3">
    <option value="Life">Life</option>
    <option value="One">One</option>
    <option value="Two">Two</option>
</select>

此外，在网站的更下方，我想对另一组 8 个选择框做同样的事情 - 它们包含一些相同的选项，但我希望它们从一开始就可以选择，直到从其中一个被选中.

Also, further down the website, I want to do the same with another group of 8 select boxes - and they contain some of the same options, but then I want them all to be choosable from the beginning, until an option from one of them get picked.

我对 jQuery 和 JavaScript 知之甚少.帮助?

I know too little about jQuery and JavaScript. Help?

推荐答案

使用 .filter获取与当前值相似的选项元素.

Use .filter to get option-elements having value similar as current value.

$('select').on('change', function() {
  $('option').prop('disabled', false); //reset all the disabled options on every change event
  $('select').each(function() { //loop through all the select elements
    var val = this.value;
    $('select').not(this).find('option').filter(function() { //filter option elements having value as selected option
      return this.value === val;
    }).prop('disabled', true); //disable those option elements
  });
}).change(); //trihgger change handler initially!

<script src="https://ajax.googleapis.com/ajax/libs/jquery/1.11.0/jquery.min.js"></script>
<select name="box1" id="box1">
  <option value="One">One</option>
  <option value="Two">Two</option>
  <option value="Three">Three</option>
</select>

<select name="box2" id="box2">
  <option value="Two">Two</option>
  <option value="One">One</option>
  <option value="Three">Three</option>
  <option value="Life">Life</option>
</select>

<select name="box3" id="box3">
  <option value="Life">Life</option>
  <option value="One">One</option>
  <option value="Two">Two</option>
</select>

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