从选择框选项调用 JavaScript

>我需要使用两种形式，并从下拉列表中调用与选择相关的任何一种。

我尝试了这个（底部的原始代码），但它仍然不起作用。我做错了什么！？

<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Strict//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-strict.dtd">
<html xmlns="http://www.w3.org/1999/xhtml" xml:lang="en" lang="en">
<head>
  <title>ASchmick form assignment</title>
  <meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
  <link href="alschmick2.css" rel="stylesheet" type="text/css" />
</head>
<body>
  <h1>Contact Me</h1>
  <h2>I'd love your feedback!</h2>
  <h3>Please choose what you would like to do:</h3>
  <p>
    <select size="1" name="choose" id="mySelect" on change="changeForm()">  
      <option value="review">Submit a review of the site</option>
      <option value="question">Submit a question</option>
    </select>
  </p>
<script>
 function changeForm() {
  var form = document.getElementById('myForm');
  var select = document.getElementById('mySelect');
  var p = document.getElementById('myScript');
  if (select.value == 'question') {
    p.innerHTML = '<script src="question.js"></script>';
    form.action = 'http://cdlwebsysdev.esc-atsystems.net/wsd/form-to-email.php';
  } else {
    p.innerHTML = '<script src="review.js"></script>';
    form.action = 'http://cdlwebsysdev.esc-atsystems.net/wsd/form-to-email.php';
  }
  }
</script>
</body>
</html>

原始问题：根据用户从下拉菜单中选择的选项，我希望显示特定的表单。我缺少一些元素或变量或定义，我无法弄清楚！

    <?xml version="1.0" encoding="UTF-8"?>
    <!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Strict//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-strict.dtd">
    <html xmlns="http://www.w3.org/1999/xhtml" xml:lang="en" lang="en">
   <head>
      <title>Dynamic HTML and Form Validation assignment</title>
      <meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
      <link href="alschmick2.css" rel="stylesheet" type="text/css" /> 
   </head>
   <body>
     <h1>Contact Me</h1>
     <h2>I'd love your feedback on my site or for you to submit a problem that I can help solve!</h2>
     <h3>Please choose what you would like to do:</h3>
     <p>
        <select size="1" name="choose" id="choose">
             <option value="review" >Submit a review of the site</option>
             <option value="question" >Submit a question</option>
        </select>
     </p>
<script type="text/javascript" > 
        if (onchange.choose="review")
        { 
         <form name="review" id="review" method="post" action="http://cdlwebsysdev.esc-atsystems.net/wsd/form-to-email.php">
           <table>
             <tr>
             <td>Name: </td>
             <td><input type="text" name="CustName" id="CustName" size="50" /></td>
             </tr>
             <tr>
             <td>Street: </td>
             <td><input type="text" name="CustStreet" id="CustStreet" size="50" /></td>
             </tr>
             <tr>
             <td>City: </td>
             <td><input type="text" name="CustCity" id="CustCity" size="25" /></td>
             </tr>
             <tr>
             <td>State: </td>
             <td><input type="text" name="CustState" id="CustState" size="5" /></td>
             </tr>
             <tr>
             <td>Zip: </td>
             <td><input type="text" name="CustZip" id="CustZip" size="15" maxlength="10" value="#####-####" /></td>
             </tr>
             <tr>
             <td>E-mail: </td>
             <td><input type="text" name="CustEmail" id="CustEmail" size="50"/></td>
             </tr>
             <tr>
             <td>Phone: </td>
             <td><input type="text" name="CustPhone" id="CustPhone" size="20" maxlength="12" value="###-###-####" /></td>
             </tr>
             <tr>
             <td>Do you want to be contaced by email or telephone?<br />
             <input type="checkbox" name="Email" id="Email" value="yes" /> Email<br />
             <input type="checkbox" name="Telephone" id="Telephone" value="yes" /> Telephone<br /> 
             </td>
             </tr>
             <tr>
             <td colspan="2">Please describe your problem:<br />
             <textarea rows="10" cols="60" name="CustComment" id="CustComment">Please let me know your thoughts!</textarea></td>
             </tr>
             <tr>
             <td>From: </td>
             <td><input type="text" name="FromAddress" size="50" /></td>
             </tr>
             <tr>
             <td><input type="submit" value="Submit" /></td>
             <td><input type="reset" /></td>
             <td><input type="hidden" name="ToAddress" value="alschmick@roadrunner.com" /></td>
             <td><input type="hidden" name="CCAddress" value=" " /></td>
             <td><input type="hidden" name="Subject" value="Comments" /></td>
             </tr>
            </table>
          </form>
         }
        </script>
<script type="text/javascript" >
        if (onchange.choose="question")
        {
        <form name="question" id="question" method="post" action="http://cdlwebsysdev.esc-atsystems.net/wsd/form-to-email.php"> /*------- this form allows user to submit a question----------*/
          <table>
             <tr>
             <td>Name: </td>
             <td><input type="text" name="CustName" id="CustName" size="50" /></td>
             </tr>
             <tr>
             <td>Street: </td>
             <td><input type="text" name="CustStreet" id="CustStreet" size="50" /></td>
             </tr>
             <tr>
             <td>City: </td>
             <td><input type="text" name="CustCity" id="CustCity" size="25" /></td>
             </tr>
             <tr>
             <td>State: </td>
             <td><input type="text" name="CustState" id="CustState" size="5" /></td>
             </tr>
             <tr>
             <td>Zip: </td>
             <td><input type="text" name="CustZip" id="CustZip" size="15" maxlength="10" value="#####-####" /></td>
             </tr>
             <tr>
             <td>E-mail: </td>
             <td><input type="text" name="CustEmail" id="CustEmail" size="50"/></td>
             </tr>
             <tr>
             <td>Phone: </td>
             <td><input type="text" name="CustPhone" id="CustPhone" size="20" maxlength="12" value="###-###-####" /></td>
             </tr>
             <tr>
             <td>Do you want to be contaced by email or telephone?<br />
             <input type="checkbox" name="Email" id="Email" value="yes" /> Email<br />
             <input type="checkbox" name="Telephone" id="Telephone" value="yes" /> Telephone<br /> 
             </td>
             </tr>
             <tr>
             <td colspan="2">Please describe your problem:<br />
             <textarea rows="10" cols="60" name="CustComment" id="CustComment">Please describe your problem or question.</textarea></td>
             </tr>
             <tr>
             <td>From: </td>
             <td><input type="text" name="FromAddress" size="50" /></td>
             </tr>
             <tr>
             <td><input type="submit" value="Submit" /></td>
             <td><input type="reset" /></td>
             <td><input type="hidden" name="ToAddress" value="alschmick@roadrunner.com" /></td>
             <td><input type="hidden" name="CCAddress" value=" " /></td>
             <td><input type="hidden" name="Subject" value="Comments" /></td>
             </tr>
            </table>
          </form>
        }
        </script> 
      </body>
    </html>

我已经尝试了各种使用java脚本调用表单的方法。上面的胡言乱语只是我的最新尝试。我还尝试了document.write和其他一些东西，以及将表单保存在单独的js文件中并尝试以这种方式调用它们，但是我错过了重要的步骤，我无法弄清楚它们是什么。

任何帮助将不胜感激。

两种形式之间没有太大区别。也许您可能只有一个表单并使用选择框的onchange事件更改属性值。

在这里，我给你留下一个通用的例子。希望对您有所帮助。

我建议您阅读HTML5指南以了解一些最佳实践。

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