根据上一个下拉列表选择显示第二个下拉列表

IT技术 javascript css html drop-down-menu
2021-03-17 16:32:33

首先，我讨厌提出一个已经处理过的问题，但你应该知道我在这个网站上找到的其他选项对我不起作用。

基本上，我想构建一个简短的表单，其中有两个下拉框。第一个始终显示，第二个默认隐藏。选择第一个下拉框中的某个选项时，我希望第二个下拉框显示。这是我的意思的一个完美例子：

http://jsfiddle.net/whkQw/20/

然而，与上面的示例不同，我有一组单独的选项显示在下拉框中，用于在第一个下拉框中选择的每个选项，而不仅仅是一个选项。换句话说，在上面的例子中，如果你选择“中国”，第二个下拉框会出现，但如果你选择其他任何东西，它会保持隐藏状态。那不是我想要的。如果您选择“台湾”，我希望显示不同的下拉列表，如果您为每个选项选择“德国”等，我希望显示不同的下拉列表。我试图简单地为每个选项复制该示例中的 javascript，相应地更改名称标签，但这不起作用（我是 Javascript 的新手）。

所以我遇到了这个例子，这正是我正在寻找的东西：

http://jsfiddle.net/e9XvP/

然而由于某种原因，这段代码似乎对我不起作用。它根本没有效果；无论选择什么，第二个下拉菜单都保持隐藏状态。我的下拉列表比上例中的要多得多，而且要长得多。这是我现在拥有的 HTML：

下拉菜单 1

<div class="ccms_form_element cfdiv_custom" id="style_container_div">
<label>Choose Rank: </label><select size="1" id="Rank" class=" validate['required']" title="" type="select" name="Rank">
    <option value="">-Select Your Rank-</option>
    <option value="Airman">Airman</option>
    <option value="Airman First Class">Airman First Class</option>
    <option value="Senior Airman">Senior Airman</option>
    <option value="Staff Sergeant">Staff Sergeant</option>
    <option value="Senior Master Sergeant">Senior Master Sergeant</option>
</select><div class="clear"></div><div id="error-message-style"></div></div>

下拉列表 2：

<div id="Airman"  class="style-sub-1"  style="display: none;" name="stylesub1" onchange="ChangeDropdowns(this.value)">
  <label>Which Job? </label>
    <select id="Airman" name="Airman">
      <option value="">-Choose A Job-</option>
      <option value="Basic Ore Miner - Level 1a">Basic Ore Miner - Level 1</option>
      <option value="Basic Ore Miner - Level 2a">Basic Ore Miner - Level 2</option>
      <option value="Basic Ore Miner - Level 3a">Basic Ore Miner - Level 3</option>
      <option value="Basic Ore Miner - Level 4a">Basic Ore Miner - Level 4</option>
      <option value="Basic Ore Miner - Level 5a">Basic Ore Miner - Level 5</option>
      <option value="Basic Ore Miner - Level 6a">Basic Ore Miner - Level 6</option>
      <option value="Basic Ore Miner - Level 7a">Basic Ore Miner - Level 7</option>
      <option value="Plagioclase Miner - Level 1a">Plagioclase Miner - Level 1</option>
      <option value="Plagioclase Miner - Level 2a">Plagioclase Miner - Level 2</option>
      <option value="Plagioclase Miner - Level 3a">Plagioclase Miner - Level 3</option>
      <option value="Plagioclase Miner - Level 4a">Plagioclase Miner - Level 4</option>
      <option value="Plagioclase Miner - Level 5a">Plagioclase Miner - Level 5</option>
      <option value="Plagioclase Miner - Level 6a">Plagioclase Miner - Level 6</option>
      <option value="Plagioclase Miner - Level 7a">Plagioclase Miner - Level 7</option>
      <option value="Omber Miner - Level 1a">Omber Miner - Level 1</option>
      <option value="Omber Miner - Level 2a">Omber Miner - Level 2</option>
      <option value="Omber Miner - Level 3a">Omber Miner - Level 3</option>
      <option value="Omber Miner - Level 4a">Omber Miner - Level 4</option>
      <option value="Omber Miner - Level 5a">Omber Miner - Level 5</option>
      <option value="Omber Miner - Level 6a">Omber Miner - Level 6</option>
      <option value="Omber Miner - Level 7a">Omber Miner - Level 7</option>
      <option value="lvl-1 Mission Runner - Level 1a">lvl-1 Mission Runner - Level 1</option>
      <option value="lvl-1 Mission Runner - Level 2a">lvl-1 Mission Runner - Level 2</option>
      <option value="lvl-1 Mission Runner - Level 3a">lvl-1 Mission Runner - Level 3</option>
      <option value="lvl-1 Mission Runner - Level 4a">lvl-1 Mission Runner - Level 4</option>
      <option value="lvl-1 Mission Runner - Level 5a">lvl-1 Mission Runner - Level 5</option>
      <option value="lvl-1 Mission Runner - Level 6a">lvl-1 Mission Runner - Level 6</option>
      <option value="lvl-1 Mission Runner - Level 7a">lvl-1 Mission Runner - Level 7</option>
      <option value="lvl-2 Mission Runner - Level 1a">lvl-2 Mission Runner - Level 1</option>
      <option value="lvl-2 Mission Runner - Level 2a">lvl-2 Mission Runner - Level 2</option>
      <option value="lvl-2 Mission Runner - Level 3a">lvl-2 Mission Runner - Level 3</option>
      <option value="lvl-2 Mission Runner - Level 4a">lvl-2 Mission Runner - Level 4</option>
      <option value="lvl-2 Mission Runner - Level 5a">lvl-2 Mission Runner - Level 5</option>
      <option value="lvl-2 Mission Runner - Level 6a">lvl-2 Mission Runner - Level 6</option>
      <option value="lvl-2 Mission Runner - Level 7a">lvl-2 Mission Runner - Level 7</option>
      <option value="lvl-3 Mission Runner - Level 1a">lvl-3 Mission Runner - Level 1</option>
      <option value="lvl-3 Mission Runner - Level 2a">lvl-3 Mission Runner - Level 2</option>
      <option value="lvl-3 Mission Runner - Level 3a">lvl-3 Mission Runner - Level 3</option>
      <option value="lvl-3 Mission Runner - Level 4a">lvl-3 Mission Runner - Level 4</option>
      <option value="lvl-3 Mission Runner - Level 5a">lvl-3 Mission Runner - Level 5</option>
      <option value="lvl-3 Mission Runner - Level 6a">lvl-3 Mission Runner - Level 6</option>
      <option value="lvl-3 Mission Runner - Level 7a">lvl-3 Mission Runner - Level 7</option>
      <option value="lvl-4 Mission Runner - Level 1a">lvl-4 Mission Runner - Level 1</option>
      <option value="lvl-4 Mission Runner - Level 2a">lvl-4 Mission Runner - Level 2</option>
      <option value="lvl-4 Mission Runner - Level 3a">lvl-4 Mission Runner - Level 3</option>
      <option value="lvl-4 Mission Runner - Level 4a">lvl-4 Mission Runner - Level 4</option>
      <option value="lvl-4 Mission Runner - Level 5a">lvl-4 Mission Runner - Level 5</option>
      <option value="lvl-4 Mission Runner - Level 6a">lvl-4 Mission Runner - Level 6</option>
      <option value="lvl-4 Mission Runner - Level 7a">lvl-4 Mission Runner - Level 7</option>
    </select>
</div>
<div id="Airman First Class"  class="style-sub-1"  style="display: none;" name="stylesub1" onchange="ChangeDropdowns(this.value)">
  <label>Which Job? </label>
    <select id="Airman First Class" name="Airman First Class">
    <option value="">-Choose A Job-</option>
      <option value="Basic Ore Miner - Level 1b">Basic Ore Miner - Level 1</option>
      <option value="Basic Ore Miner - Level 2b">Basic Ore Miner - Level 2</option>
      <option value="Basic Ore Miner - Level 3b">Basic Ore Miner - Level 3</option>
      <option value="Basic Ore Miner - Level 4b">Basic Ore Miner - Level 4</option>
      <option value="Basic Ore Miner - Level 5b">Basic Ore Miner - Level 5</option>
      <option value="Basic Ore Miner - Level 6b">Basic Ore Miner - Level 6</option>
      <option value="Basic Ore Miner - Level 7b">Basic Ore Miner - Level 7</option>
      <option value="Plagioclase Miner - Level 1b">Plagioclase Miner - Level 1</option>
      <option value="Plagioclase Miner - Level 2b">Plagioclase Miner - Level 2</option>
      <option value="Plagioclase Miner - Level 3b">Plagioclase Miner - Level 3</option>
      <option value="Plagioclase Miner - Level 4b">Plagioclase Miner - Level 4</option>
      <option value="Plagioclase Miner - Level 5b">Plagioclase Miner - Level 5</option>
      <option value="Plagioclase Miner - Level 6b">Plagioclase Miner - Level 6</option>
      <option value="Plagioclase Miner - Level 7b">Plagioclase Miner - Level 7</option>
      <option value="Omber Miner - Level 1b">Omber Miner - Level 1</option>  
      <option value="Omber Miner - Level 2b">Omber Miner - Level 2</option>
      <option value="Omber Miner - Level 3b">Omber Miner - Level 3</option>
      <option value="Omber Miner - Level 4b">Omber Miner - Level 4</option>
      <option value="Omber Miner - Level 5b">Omber Miner - Level 5</option>
      <option value="Omber Miner - Level 6b">Omber Miner - Level 6</option>
      <option value="Omber Miner - Level 7b">Omber Miner - Level 7</option>
      <option value="lvl-1 Mission Runner - Level 1b">lvl-1 Mission Runner - Level 1</option>
      <option value="lvl-1 Mission Runner - Level 2b">lvl-1 Mission Runner - Level 2</option>
      <option value="lvl-1 Mission Runner - Level 3b">lvl-1 Mission Runner - Level 3</option>
      <option value="lvl-1 Mission Runner - Level 4b">lvl-1 Mission Runner - Level 4</option>
      <option value="lvl-1 Mission Runner - Level 5b">lvl-1 Mission Runner - Level 5</option>
      <option value="lvl-1 Mission Runner - Level 6b">lvl-1 Mission Runner - Level 6</option>
      <option value="lvl-1 Mission Runner - Level 7b">lvl-1 Mission Runner - Level 7</option>
      <option value="lvl-2 Mission Runner - Level 1b">lvl-2 Mission Runner - Level 1</option>
       <option value="lvl-2 Mission Runner - Level 2b">lvl-2 Mission Runner - Level 2</option>
       <option value="lvl-2 Mission Runner - Level 3b">lvl-2 Mission Runner - Level 3</option>
       <option value="lvl-2 Mission Runner - Level 4b">lvl-2 Mission Runner - Level 4</option>
       <option value="lvl-2 Mission Runner - Level 5b">lvl-2 Mission Runner - Level 5</option>
       <option value="lvl-2 Mission Runner - Level 6b">lvl-2 Mission Runner - Level 6</option>
       <option value="lvl-2 Mission Runner - Level 7b">lvl-2 Mission Runner - Level 7</option>
      <option value="lvl-3 Mission Runner - Level 1b">lvl-3 Mission Runner - Level 1</option>
       <option value="lvl-3 Mission Runner - Level 2b">lvl-3 Mission Runner - Level 2</option>
       <option value="lvl-3 Mission Runner - Level 3b">lvl-3 Mission Runner - Level 3</option>
       <option value="lvl-3 Mission Runner - Level 4b">lvl-3 Mission Runner - Level 4</option>
       <option value="lvl-3 Mission Runner - Level 5b">lvl-3 Mission Runner - Level 5</option>
       <option value="lvl-3 Mission Runner - Level 6b">lvl-3 Mission Runner - Level 6</option>
       <option value="lvl-3 Mission Runner - Level 7b">lvl-3 Mission Runner - Level 7</option>
      <option value="lvl-4 Mission Runner - Level 1b">lvl-4 Mission Runner - Level 1</option>
       <option value="lvl-4 Mission Runner - Level 2b">lvl-4 Mission Runner - Level 2</option>
       <option value="lvl-4 Mission Runner - Level 3b">lvl-4 Mission Runner - Level 3</option>
       <option value="lvl-4 Mission Runner - Level 4b">lvl-4 Mission Runner - Level 4</option>
       <option value="lvl-4 Mission Runner - Level 5b">lvl-4 Mission Runner - Level 5</option>
       <option value="lvl-4 Mission Runner - Level 6b">lvl-4 Mission Runner - Level 6</option>
       <option value="lvl-4 Mission Runner - Level 7b">lvl-4 Mission Runner - Level 7</option>
    </select>
</div>
<div id="Senior Airman"  class="style-sub-1"  style="display: none;" name="stylesub1" onchange="ChangeDropdowns(this.value)">
  <label>Which Job? </label>
    <select id="Senior Airman" name="Senior Airman">
    <option value="">-Choose A Job-</option>
      <option value="Basic Ore Miner - Level 1c">Basic Ore Miner - Level 1</option>
       <option value="Basic Ore Miner - Level 2c">Basic Ore Miner - Level 2</option>
       <option value="Basic Ore Miner - Level 3c">Basic Ore Miner - Level 3</option>
       <option value="Basic Ore Miner - Level 4c">Basic Ore Miner - Level 4</option>
       <option value="Basic Ore Miner - Level 5c">Basic Ore Miner - Level 5</option>
       <option value="Basic Ore Miner - Level 6c">Basic Ore Miner - Level 6</option>
       <option value="Basic Ore Miner - Level 7c">Basic Ore Miner - Level 7</option>
       <option value="Plagioclase Miner - Level 1c">Plagioclase Miner - Level 1</option>
       <option value="Plagioclase Miner - Level 2c">Plagioclase Miner - Level 2</option>
       <option value="Plagioclase Miner - Level 3c">Plagioclase Miner - Level 3</option>
       <option value="Plagioclase Miner - Level 4c">Plagioclase Miner - Level 4</option>
       <option value="Plagioclase Miner - Level 5c">Plagioclase Miner - Level 5</option>
       <option value="Plagioclase Miner - Level 6c">Plagioclase Miner - Level 6</option>
       <option value="Plagioclase Miner - Level 7c">Plagioclase Miner - Level 7</option>
       <option value="Omber Miner - Level 1c">Omber Miner - Level 1</option>  
       <option value="Omber Miner - Level 2c">Omber Miner - Level 2</option>
       <option value="Omber Miner - Level 3c">Omber Miner - Level 3</option>
       <option value="Omber Miner - Level 4c">Omber Miner - Level 4</option>
       <option value="Omber Miner - Level 5c">Omber Miner - Level 5</option>
       <option value="Omber Miner - Level 6c">Omber Miner - Level 6</option>
       <option value="Omber Miner - Level 7c">Omber Miner - Level 7</option>
       <option value="lvl-1 Mission Runner - Level 1c">lvl-1 Mission Runner - Level 1</option>
       <option value="lvl-1 Mission Runner - Level 2c">lvl-1 Mission Runner - Level 2</option>
       <option value="lvl-1 Mission Runner - Level 3c">lvl-1 Mission Runner - Level 3</option>
       <option value="lvl-1 Mission Runner - Level 4c">lvl-1 Mission Runner - Level 4</option>
       <option value="lvl-1 Mission Runner - Level 5c">lvl-1 Mission Runner - Level 5</option>
       <option value="lvl-1 Mission Runner - Level 6c">lvl-1 Mission Runner - Level 6</option>
       <option value="lvl-1 Mission Runner - Level 7c">lvl-1 Mission Runner - Level 7</option>
       <option value="lvl-2 Mission Runner - Level 1c">lvl-2 Mission Runner - Level 1</option>
       <option value="lvl-2 Mission Runner - Level 2c">lvl-2 Mission Runner - Level 2</option>
       <option value="lvl-2 Mission Runner - Level 3c">lvl-2 Mission Runner - Level 3</option>
       <option value="lvl-2 Mission Runner - Level 4c">lvl-2 Mission Runner - Level 4</option>
       <option value="lvl-2 Mission Runner - Level 5c">lvl-2 Mission Runner - Level 5</option>
       <option value="lvl-2 Mission Runner - Level 6c">lvl-2 Mission Runner - Level 6</option>
       <option value="lvl-2 Mission Runner - Level 7c">lvl-2 Mission Runner - Level 7</option>
       <option value="lvl-3 Mission Runner - Level 1c">lvl-3 Mission Runner - Level 1</option>
       <option value="lvl-3 Mission Runner - Level 2c">lvl-3 Mission Runner - Level 2</option>
       <option value="lvl-3 Mission Runner - Level 3c">lvl-3 Mission Runner - Level 3</option>
       <option value="lvl-3 Mission Runner - Level 4c">lvl-3 Mission Runner - Level 4</option>
       <option value="lvl-3 Mission Runner - Level 5c">lvl-3 Mission Runner - Level 5</option>
       <option value="lvl-3 Mission Runner - Level 6c">lvl-3 Mission Runner - Level 6</option>
       <option value="lvl-3 Mission Runner - Level 7c">lvl-3 Mission Runner - Level 7</option>
       <option value="lvl-4 Mission Runner - Level 1c">lvl-4 Mission Runner - Level 1</option>
       <option value="lvl-4 Mission Runner - Level 2c">lvl-4 Mission Runner - Level 2</option>
       <option value="lvl-4 Mission Runner - Level 3c">lvl-4 Mission Runner - Level 3</option>
       <option value="lvl-4 Mission Runner - Level 4c">lvl-4 Mission Runner - Level 4</option>
       <option value="lvl-4 Mission Runner - Level 5c">lvl-4 Mission Runner - Level 5</option>
       <option value="lvl-4 Mission Runner - Level 6c">lvl-4 Mission Runner - Level 6</option>
       <option value="lvl-4 Mission Runner - Level 7c">lvl-4 Mission Runner - Level 7</option>
    </select>
</div>
<div id="Staff Sergeant"  class="style-sub-1"  style="display: none;" name="stylesub1" onchange="ChangeDropdowns(this.value)">
  <label>Which Job? </label>
    <select id="Staff Sergeant" name="Staff Sergeant">
    <option value="">-Choose A Job-</option>
      <option value="Basic Ore Miner - Level 1d">Basic Ore Miner - Level 1</option>
       <option value="Basic Ore Miner - Level 2d">Basic Ore Miner - Level 2</option>
       <option value="Basic Ore Miner - Level 3d">Basic Ore Miner - Level 3</option>
       <option value="Basic Ore Miner - Level 4d">Basic Ore Miner - Level 4</option>
       <option value="Basic Ore Miner - Level 5d">Basic Ore Miner - Level 5</option>
       <option value="Basic Ore Miner - Level 6d">Basic Ore Miner - Level 6</option>
       <option value="Basic Ore Miner - Level 7d">Basic Ore Miner - Level 7</option>
       <option value="Plagioclase Miner - Level 1d">Plagioclase Miner - Level 1</option>
       <option value="Plagioclase Miner - Level 2d">Plagioclase Miner - Level 2</option>
       <option value="Plagioclase Miner - Level 3d">Plagioclase Miner - Level 3</option>
       <option value="Plagioclase Miner - Level 4d">Plagioclase Miner - Level 4</option>
       <option value="Plagioclase Miner - Level 5d">Plagioclase Miner - Level 5</option>
       <option value="Plagioclase Miner - Level 6d">Plagioclase Miner - Level 6</option>
       <option value="Plagioclase Miner - Level 7d">Plagioclase Miner - Level 7</option>
       <option value="Omber Miner - Level 1d">Omber Miner - Level 1</option>  
       <option value="Omber Miner - Level 2d">Omber Miner - Level 2</option>
       <option value="Omber Miner - Level 3d">Omber Miner - Level 3</option>
       <option value="Omber Miner - Level 4d">Omber Miner - Level 4</option>
       <option value="Omber Miner - Level 5d">Omber Miner - Level 5</option>
       <option value="Omber Miner - Level 6d">Omber Miner - Level 6</option>
       <option value="Omber Miner - Level 7d">Omber Miner - Level 7</option>
      <option value="lvl-1 Mission Runner - Level 1d">lvl-1 Mission Runner - Level 1</option>
      <option value="lvl-1 Mission Runner - Level 2d">lvl-1 Mission Runner - Level 2</option>
      <option value="lvl-1 Mission Runner - Level 3d">lvl-1 Mission Runner - Level 3</option>
      <option value="lvl-1 Mission Runner - Level 4d">lvl-1 Mission Runner - Level 4</option>
      <option value="lvl-1 Mission Runner - Level 5d">lvl-1 Mission Runner - Level 5</option>
      <option value="lvl-1 Mission Runner - Level 6d">lvl-1 Mission Runner - Level 6</option>
      <option value="lvl-1 Mission Runner - Level 7d">lvl-1 Mission Runner - Level 7</option>
      <option value="lvl-2 Mission Runner - Level 1d">lvl-2 Mission Runner - Level 1</option>
       <option value="lvl-2 Mission Runner - Level 2d">lvl-2 Mission Runner - Level 2</option>
       <option value="lvl-2 Mission Runner - Level 3d">lvl-2 Mission Runner - Level 3</option>
       <option value="lvl-2 Mission Runner - Level 4d">lvl-2 Mission Runner - Level 4</option>
       <option value="lvl-2 Mission Runner - Level 5d">lvl-2 Mission Runner - Level 5</option>
       <option value="lvl-2 Mission Runner - Level 6d">lvl-2 Mission Runner - Level 6</option>
       <option value="lvl-2 Mission Runner - Level 7d">lvl-2 Mission Runner - Level 7</option>
      <option value="lvl-3 Mission Runner - Level 1d">lvl-3 Mission Runner - Level 1</option>
       <option value="lvl-3 Mission Runner - Level 2d">lvl-3 Mission Runner - Level 2</option>
       <option value="lvl-3 Mission Runner - Level 3d">lvl-3 Mission Runner - Level 3</option>
       <option value="lvl-3 Mission Runner - Level 4d">lvl-3 Mission Runner - Level 4</option>
       <option value="lvl-3 Mission Runner - Level 5d">lvl-3 Mission Runner - Level 5</option>
       <option value="lvl-3 Mission Runner - Level 6d">lvl-3 Mission Runner - Level 6</option>
       <option value="lvl-3 Mission Runner - Level 7d">lvl-3 Mission Runner - Level 7</option>
      <option value="lvl-4 Mission Runner - Level 1d">lvl-4 Mission Runner - Level 1</option>
       <option value="lvl-4 Mission Runner - Level 2d">lvl-4 Mission Runner - Level 2</option>
       <option value="lvl-4 Mission Runner - Level 3d">lvl-4 Mission Runner - Level 3</option>
       <option value="lvl-4 Mission Runner - Level 4d">lvl-4 Mission Runner - Level 4</option>
       <option value="lvl-4 Mission Runner - Level 5d">lvl-4 Mission Runner - Level 5</option>
       <option value="lvl-4 Mission Runner - Level 6d">lvl-4 Mission Runner - Level 6</option>
       <option value="lvl-4 Mission Runner - Level 7d">lvl-4 Mission Runner - Level 7</option>
    </select>
</div>
<div id="Senior Master Sergeant"  class="style-sub-1"  style="display: none;" name="stylesub1" onchange="ChangeDropdowns(this.value)">
  <label>Which Job? </label>
    <select id="Senior Master Sergeant" name="Senior Master Sergeant">
    <option value="">-Choose A Job-</option>
      <option value="Basic Ore Miner - Level 1e">Basic Ore Miner - Level 1</option>
       <option value="Basic Ore Miner - Level 2e">Basic Ore Miner - Level 2</option>
       <option value="Basic Ore Miner - Level 3e">Basic Ore Miner - Level 3</option>
       <option value="Basic Ore Miner - Level 4e">Basic Ore Miner - Level 4</option>
       <option value="Basic Ore Miner - Level 5e">Basic Ore Miner - Level 5</option>
       <option value="Basic Ore Miner - Level 6e">Basic Ore Miner - Level 6</option>
       <option value="Basic Ore Miner - Level 7e">Basic Ore Miner - Level 7</option>
       <option value="Plagioclase Miner - Level 1e">Plagioclase Miner - Level 1</option>
       <option value="Plagioclase Miner - Level 2e">Plagioclase Miner - Level 2</option>
       <option value="Plagioclase Miner - Level 3e">Plagioclase Miner - Level 3</option>
       <option value="Plagioclase Miner - Level 4e">Plagioclase Miner - Level 4</option>
       <option value="Plagioclase Miner - Level 5e">Plagioclase Miner - Level 5</option>
       <option value="Plagioclase Miner - Level 6e">Plagioclase Miner - Level 6</option>
       <option value="Plagioclase Miner - Level 7e">Plagioclase Miner - Level 7</option>
       <option value="Omber Miner - Level 1e">Omber Miner - Level 1</option>  
       <option value="Omber Miner - Level 2e">Omber Miner - Level 2</option>
       <option value="Omber Miner - Level 3e">Omber Miner - Level 3</option>
       <option value="Omber Miner - Level 4e">Omber Miner - Level 4</option>
       <option value="Omber Miner - Level 5e">Omber Miner - Level 5</option>
       <option value="Omber Miner - Level 6e">Omber Miner - Level 6</option>
       <option value="Omber Miner - Level 7e">Omber Miner - Level 7</option>
      <option value="lvl-1 Mission Runner - Level 1e">lvl-1 Mission Runner - Level 1</option>
      <option value="lvl-1 Mission Runner - Level 2e">lvl-1 Mission Runner - Level 2</option>
      <option value="lvl-1 Mission Runner - Level 3e">lvl-1 Mission Runner - Level 3</option>
      <option value="lvl-1 Mission Runner - Level 4e">lvl-1 Mission Runner - Level 4</option>
      <option value="lvl-1 Mission Runner - Level 5e">lvl-1 Mission Runner - Level 5</option>
      <option value="lvl-1 Mission Runner - Level 6e">lvl-1 Mission Runner - Level 6</option>
      <option value="lvl-1 Mission Runner - Level 7e">lvl-1 Mission Runner - Level 7</option>
      <option value="lvl-2 Mission Runner - Level 1e">lvl-2 Mission Runner - Level 1</option>
       <option value="lvl-2 Mission Runner - Level 2e">lvl-2 Mission Runner - Level 2</option>
       <option value="lvl-2 Mission Runner - Level 3e">lvl-2 Mission Runner - Level 3</option>
       <option value="lvl-2 Mission Runner - Level 4e">lvl-2 Mission Runner - Level 4</option>
       <option value="lvl-2 Mission Runner - Level 5e">lvl-2 Mission Runner - Level 5</option>
       <option value="lvl-2 Mission Runner - Level 6e">lvl-2 Mission Runner - Level 6</option>
       <option value="lvl-2 Mission Runner - Level 7e">lvl-2 Mission Runner - Level 7</option>
      <option value="lvl-3 Mission Runner - Level 1e">lvl-3 Mission Runner - Level 1</option>
       <option value="lvl-3 Mission Runner - Level 2e">lvl-3 Mission Runner - Level 2</option>
       <option value="lvl-3 Mission Runner - Level 3e">lvl-3 Mission Runner - Level 3</option>
       <option value="lvl-3 Mission Runner - Level 4e">lvl-3 Mission Runner - Level 4</option>
       <option value="lvl-3 Mission Runner - Level 5e">lvl-3 Mission Runner - Level 5</option>
       <option value="lvl-3 Mission Runner - Level 6e">lvl-3 Mission Runner - Level 6</option>
       <option value="lvl-3 Mission Runner - Level 7e">lvl-3 Mission Runner - Level 7</option>
      <option value="lvl-4 Mission Runner - Level 1e">lvl-4 Mission Runner - Level 1</option>
       <option value="lvl-4 Mission Runner - Level 2e">lvl-4 Mission Runner - Level 2</option>
       <option value="lvl-4 Mission Runner - Level 3e">lvl-4 Mission Runner - Level 3</option>
       <option value="lvl-4 Mission Runner - Level 4e">lvl-4 Mission Runner - Level 4</option>
       <option value="lvl-4 Mission Runner - Level 5e">lvl-4 Mission Runner - Level 5</option>
       <option value="lvl-4 Mission Runner - Level 6e">lvl-4 Mission Runner - Level 6</option>
       <option value="lvl-4 Mission Runner - Level 7e">lvl-4 Mission Runner - Level 7</option>
    </select>
</div>
        <div class="clear"></div><div id="error-message-style-sub-1"></div></div>

正如我所说，上述示例中的任何 javascript 代码都不适用于我，而且我对 javascript 还很陌生（并且对 HTML 也没有过多的经验）所以有什么建议吗？

此外，一旦用户在第二个下拉框中进行了选择，我希望在下拉框下方显示一行唯一的文本（即他们的选择所独有的）。这是我找到的一个例子：

选择/取消选择特定下拉选项时切换隐藏的 div

然而，再一次，与这个例子不同，我不希望只有一个选项来显示文本；我希望为所选的每个选项显示不同的文本行。我将如何修改此示例中的代码以使其工作？

我知道这可能会成为一个大项目，所以不要担心为我输入所有内容，如果你能给我一个我必须做什么来修改代码的示例，以便它会影响到更多只有一种选择。正如您可能会从这篇文章的大小猜到的那样，我对写得很长很满意。

任何帮助将非常感激。

提前致谢。

4个回答

无论如何，您已经得到了最容易用于这项工作的 HTML 标记：

<select size="1" id="Rank" title="" name="Rank">
    <option value="">-Select Your Rank-</option>
    <option value="Airman">Airman</option>
    <option value="Airman First Class">Airman First Class</option>
    <option value="Senior Airman">Senior Airman</option>
    <option value="Staff Sergeant">Staff Sergeant</option>
    <option value="Senior Master Sergeant">Senior Master Sergeant</option>
</select>

然后<element>为 的每种可能性设置一个容器<option>。

<div>
    // For Airman
</div>
<div>
    // For Senior Airman
</div>

……等等等等……

对于取决于<option>选择的所有内容，我会使用相同的布局；您想要的唯一文本行、其他选择框等。我会将每个元素都包装在一个容器元素中，这样您就可以轻松地将所有元素定位为一个。

<div class="container">
    <div>
        Line of text for Airman
    </div>
    <div>
        Line of text for Senior Airman
    </div>
</div>

<div class="container">
    <div>
        <select>
            <option>Airman Stuff</option>
        </select>
    </div>
    <div>
        <select>
            <option>Senior Airman Stuff</option>
        </select>
    </div>
</div>

现在为<div>我们拥有的每个人敲一个标识符，所以当“飞行员”被选中时，我们知道哪些<div>是飞行员（所以我们知道展示那些人！）

<div class="container">
    <div class="airman">
        Line of text for Airman
    </div>
    <div class="senior-airman">
        Line of text for Senior Airman
    </div>
</div>

<div class="container">
    <div class="airman">
        <select>
            <option>Airman Stuff</option>
        </select>
    </div>
    <div class="senior-airman">
        <select>
            <option>Senior Airman Stuff</option>
        </select>
    </div>
</div>

并将相同的标识符添加到<options>的 中<select id="rank">：

<select size="1" id="Rank" title="" name="Rank">
    <option value="">-Select Your Rank-</option>
    <option value="airman">Airman</option>
    <option value="senior-airman">Senior Airman</option>
</select>

现在我们有了这个标记，应用 JavaScript 来隐藏/显示变得如此简单！

$(document).ready(function () {
    $('#Rank').bind('change', function () {
        var elements = $('div.container').children().hide(); // hide all the elements
        var value = $(this).val();

        if (value.length) { // if somethings' selected
            elements.filter('.' + value).show(); // show the ones we want
        }
    }).trigger('change'); // Setup the initial states
});

完毕; 结帐示例：http : //jsfiddle.net/3UWk2/1/

您的评论的更新

您尝试更改代码的尝试没有成功的原因是因为我们目前没有绑定到第二级<select>框的事件处理程序；只为<select id="rank">

您需要基本上重复我们刚刚为第一级导航和第二级导航所做的一切。使用;而不是为 使用#id选择器。因为我们要定位的元素不止一个，而且's 必须是唯一的：<select>.class<select>#id

$('.second-level-select').bind('change', function () {
    var elements = $('div.second-level-container').children().hide(); // hide all the elements
    var value = $(this).val();

    if (value.length) { // if somethings' selected
        elements.filter('.' + value).show(); // show the ones we want
    }
}).trigger('change'); // Setup the initial states

我们还必须更改 的名称div.container，以阻止<select>盒子隐藏彼此的元素。

在此处查看更新的示例：http : //jsfiddle.net/3UWk2/3/

非常感谢，马特，这看起来正是我需要的！
2021-05-03 16:32:33
实际上，最后一件事；我希望在第二个下拉列表中为每个选项显示唯一的文本行，而不是第一个（即“飞行员内容的文本行”、“高级飞行员内容的文本行”等，而不是“飞行员的文本行”），我只希望它在第二个下拉列表中的一个选项被选中后显示。我尝试将您的第一个容器中的类更改为“airman-stuff”等，然后在“Airman Stuff”<option> 标签中添加匹配的值，但这并没有奏效。我是否需要将该容器命名为其他名称，然后以某种方式编辑 javascript？
2021-05-05 16:32:33
奇迹般有效。:) 再次感谢马特，这教会了我很多。
2021-05-05 16:32:33

哇，这是很多代码……但实际上用 jQuery 很容易做到（如果这是一个选项）。看我的例子。

您需要做的第一件事是删除 id 中的空格。这通常很糟糕。其次，您只需根据将它们作为 id 传递的选择列表中的这些值来显示/隐藏。

jQuery（不过不要忘记包含 jQuery 链接）：

$("#Rank").change(function(){
   correspondingID = $(this).find(":selected").val()
   $(".style-sub-1").hide();
   $("#" + correspondingID).show();
})

我的解决方案和建议是使用 AJAX。如果您有很多选项，并且每个选项都有很多其他选项，那么立即加载它们是没有意义的。这个想法是发送一个 AJAX 请求并使用适当的选项更新第二个选择。您还可以为数据库中的每个选项存储正确的文本.. 这样，您就拥有了您想要的一切，并且不会强迫用户下载不必要的选择

这也是一个更容易长期维护的解决方案。网页中打开或关闭的大量选择对于之后必须在网页上工作的其他人来说可能有点消化。
2021-05-09 16:32:33
我不熟悉 AJAX，但感谢您的回复，我会研究一下，看看我能想出什么。
2021-05-15 16:32:33

首先包含html代码

 <!-------first dropdown----------->
    <select name="make" id="elements">
      <option value="">-</option>
      <option value="Satec" >Satec</option>
      <option data-val='m2' value="Masibus" >Masibus</option>
      <option data-val='m3' value="Pyrotech" >Pyrotech</option>
       <option data-val='m4' value="Schneider" >Schneider</option>

    </select>

    <!---------second dropdown---------->
    <select name="model" id="category">
      <option value="">-</option>
      <option value="PM130" >PM130</option>
      <option value="PM2160A" >PM2160A</option>
      <option value="MFM101" >MFM101</option>
       <option value="ABC" >ABC</option>
    </select>

包含js脚本后

<script>
var category = document.getElementById('category');
document.getElementById('elements').onchange = function() {
  var optionSelected = this.options[this.selectedIndex];
  if (optionSelected.textContent != '-') {
    if (optionSelected.dataset.val === 'm2') {
      category.value = 'PM2160A';
    }
    else if (optionSelected.dataset.val === 'm3')  {
    category.value='MFM101';
}
    else if (optionSelected.dataset.val === 'm4')  {
    category.value='ABC';
}
    else {
      category.value = 'PM130';
    }
  } else {
    category.value = '';
  }
}
</script>

它肯定会起作用。

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