javascript - 如果选择第 1 或 2nr，则禁用第 3、4 个下拉列表

Question

我有这个问题:在我的表单中有 4 个下拉列表，当选择第一个 (category1) 或第二个 (software1) 下拉列表时，必须禁用第三个 (category2) 和第四个 (software2)。

对于这个问题，我在 disable-second-dropdown-if-the-first-is-not-selected 找到了这个脚本但我不相信修改这个:

<script src="https://ajax.googleapis.com/ajax/libs/jquery/1.9.1/jquery.min.js"></script>
category1
<select name='cat1'>
  <option value='0'>Select one</option>
  <option value='1'>little</option>
  <option value='2'>good</option>
</select>

software1
<select name='soft1'>
  <option value=''>Select one</option>
  <option value='W'>Word</option>
  <option value='E'>Excel</option>
  <option value='PP'>Power Point</option>
</select>

<br />
category2
<select name='cat2'>
  <option value='0'>Select one</option>
  <option value='1'>little</option>
  <option value='2'>good</option>
</select>

software2
<select name='soft2'>
  <option value=''>Select one</option>
  <option value='W'>Word</option>
  <option value='E'>Excel</option>
  <option value='PP'>Power Point</option>
</select>

<script type="text/javascript">
var setEnabled = function(e) {
  var name = this.name.replace(/1/, '2'); //get name for second drop down
  $('select[name=' + name + ']')
      .prop('disabled', 0 === this.selectedIndex) // disable if selected option is first one
};

$(function() {
  $('select[name=cat1], select[name=soft1]')
      .on('change', setEnabled)
      .trigger('change'); // trigger on page load
});
</script>

如何修改？

谢谢

Answer 1

我认为你想要的主要是将 === 翻转为 !==

但是，要使其在矩阵上运行，其中两个顶部输入都会触发两个底部输入的启用/禁用，您需要在其中任何一个发生变化时都进行测试。

var setEnabled = function(e) {
  var selected = $('select[name=cat1]').prop('selectedIndex') > 0 || $('select[name=soft1]').prop('selectedIndex') > 0;
  $('select[name=cat2], select[name=soft2]').prop('disabled', selected); // disable if selected option is first one
  if (selected) {
    $('select[name=cat2], select[name=soft2]').prop('selectedIndex', 0)
  }
};

$(function() {
  $('select[name=cat1], select[name=soft1]')
      .on('change', setEnabled)
      .trigger('change'); // trigger on page load
});

<script src="https://ajax.googleapis.com/ajax/libs/jquery/1.9.1/jquery.min.js"></script>
</script>
category1
<select name='cat1'>
  <option value='0'>Select one</option>
  <option value='1'>little</option>
  <option value='2'>good</option>
</select>

software1
<select name='soft1'>
  <option value=''>Select one</option>
  <option value='W'>Word</option>
  <option value='E'>Excel</option>
  <option value='PP'>Power Point</option>
</select>

<br />
category2
<select name='cat2'>
  <option value='0'>Select one</option>
  <option value='1'>little</option>
  <option value='2'>good</option>
</select>

software2
<select name='soft2'>
  <option value=''>Select one</option>
  <option value='W'>Word</option>
  <option value='E'>Excel</option>
  <option value='PP'>Power Point</option>
</select>