基于下拉选择将文本加载到文本区域

Question

首先，我搜索了该站点并找到了这个：

How to fill in a text field with drop down selection

但它不适合我的需要，因为我正在生成非常长的模板，并且上述方法太耗时且不切实际，因为这意味着用我的模板填充每个 <option> 标记的 value 属性.

代码如下：

<script type="text/javascript">
//<![CDATA[ 
function showCSTemplates(sel){   

locations =[ "", /*this remains blank for first selection in drop-down list*/ 

/*option 1*/                 
" This is template 1 that  will appear in a
textarea keeping 
its formatting 
as  
is. ",

/*option 2*/                
" This is template 2 that 
 will appear in a
 textarea keeping its 
 formatting as  is.

Credentials:  
Contact Info: ",

/*option 3*/                 
" This is template 3 that  will appear in a
textarea keeping its formatting as  is.

Donec tortor lorem,  
ornare vitae commodo nec,  
sagittis et nunc. 
Maecenas sagittis quam ",

/*option 4*/                 
"etc",

/*option 5*/                 
"etc...", ];
                        srcLocation = locations    [sel.selectedIndex];         
                        if (srcLocation != undefined && srcLocation != "") {      
                  document.getElementById('CSTemplates').innerHTML = srcLocation;   
 } 
}  //]]>
</script>

这是标记：

<h1>Note Generator</h1>

<div class="left">
CSTemplates
<p>
<select class="c10"> 
<option selected="selected" value="" id="Templates" onchange="showCSTemplates(this);">Please select a template...</option>
<option>1</option>
<option>2</option>
<option>3</option>
<option>4</option>
<option>5</option>
</select>
</p>
<p>
<textarea cols="30" rows="20" readonly="readonly" id="CSTemplates">
Templates will auto-populate 
here depending on the 
selection made from the 

[CSTemplates] 

drop-down list.
</textarea>
</p>
</div><!--left ends here-->

最糟糕的是，当我测试它时，我什至没有收到脚本错误，它根本不起作用，所以我不知道我哪里出错了。我已经使用<input type="text"> 标签完成了一个类似的页面，它们运行良好，但无论我尝试什么，我似乎都无法让它与<textarea> 一起使用。

任何帮助将不胜感激！提前致谢！

于 2011 年 9 月 2 日星期五下午 1:17:34 编辑

为了澄清上面我所说的“我在测试这个时甚至没有收到脚本错误，它根本不起作用，”

我的意思是，如果我将模板全部放在一行上，即

/*option 1*/                 
" This is template 1 that  will appear in a textarea keeping its formatting as is. ",

然后我没有收到错误。但是，如果我为上述格式输入换行符：

/*option 1*/                 
" This is template 1 that  will appear in a
textarea keeping 
its formatting 
as  
is. ",

然后我收到“未终止的字符串常量”错误。使用\n 会解决这个错误吗？另外，我把它排除在脚本之外是因为我不知道该怎么做，而是在它说的<textarea> 中

Templates will auto-populate 
here depending on the 
selection made from the 

[CSTemplates] 

drop-down list.

当用户从下拉列表中选择一个选项时，我需要删除，并且<textarea> 需要从脚本中填充相应的选项。谢谢！

Answer 1

好的，你在代码中有很多问题，主要是在选项中指定 onchange 而不是选择，我也解决了一些小问题，这是一个工作示例http://jsfiddle.net/gKsdK/1/

这是标记

<h1>Note Generator</h1>

<div class="left">
CSTemplates
<p>
<select class="c10" onchange="showCSTemplates(this);"> 
<option selected="selected" value="" id="Templates">Please select a template...</option>
<option>1</option>
<option>2</option>
<option>3</option>
<option>4</option>
<option>5</option>
</select>
</p>
<p>
<textarea cols="30" rows="20" readonly="readonly" id="CSTemplates">
Templates will auto-populate 
here depending on the 
selection made from the 

[CSTemplates] 

drop-down list.
</textarea>
</p>
</div><!--left ends here-->

这里是 JS

function showCSTemplates(sel){   

locations =[ "", /*this remains blank for first selection in drop-down list*/ 

/*option 1*/                 
" This is template 1 that  will appear in a textarea keeping its formatting as  is. ",

/*option 2*/                
" This is template 2 that  will appear in a textarea keeping its  formatting as  is. Credentials:  Contact Info: ",

/*option 3*/                 
" This is template 3 that  will appear in a textarea keeping its formatting as  is. Donec tortor lorem,  ornare vitae commodo nec,  sagittis et nunc. Maecenas sagittis quam ",

/*option 4*/                 
"etc",

/*option 5*/                 
"etc...", ];
                   srcLocation = locations    [sel.selectedIndex];        
   if (srcLocation != undefined && srcLocation != "") {      
                  document.getElementById('CSTemplates').innerHTML= srcLocation;   
 } 
}

Answer 2

您已将onchange 事件绑定到option 而不是select。

Answer 3

如果你想在多行上有一个字符串，你必须将它连接起来：

/*option 1*/                 
" This is template 1 that  will appear in a \n"+
"textarea keeping \n"+
"its formatting \n"+
"as \n"+  
"is. \n",

\n 仅用于在您的 .

中创建分隔线

如果您想更改文本区域的内容，请使用属性 .value 而不是 .innerHTML ！