phtm文件列表中的必选检查字段 - Mandatory Check field in a list in phtm file

Mandatory Check field in a list in phtm file

本文关键字：检查字段文件列表 phtm | 更新日期: 2023-09-27

我有一个包含一些元素的列表。既然大多数浏览器都不支持select required，我怎么能把mandatory check放到这个列表中呢

<th>From *</th>
<th><select name="from">
        <option value="builder">Builder</option>
        <option value="broker">Broker</option>
        <option value="seeker">Seeker</option>
        <option value="owner">Owner</option>
        <option value="regular cf user">Regular CF user</option>
        <option value="ams user">AMS user</option>
        <option value="home needs user">Home Needs User</option>
</select>
</th>

这是我的给定列表，我想检查的强制性字段

POST表单后，只需检查值，如果为空或缺失，则显示错误:

if (! isset($_POST['from']) || empty($_POST['from']))
{
    // Deal with the fact that a mandatory field was not provided.
}

使用javascript。

<th>From *</th>
<th><select name="from" onchange="return validate();">
        <option value="">Select One</option>
        <option value="builder">Builder</option>
        <option value="broker">Broker</option>
        <option value="seeker">Seeker</option>
        <option value="owner">Owner</option>
        <option value="regular cf user">Regular CF user</option>
        <option value="ams user">AMS user</option>
        <option value="home needs user">Home Needs User</option>
</select>
</th>

Javascript

  <script type="text/javascript>
    function validate()
    {
        var from=document.getElementsByName('from').value;
        if(from==""){
           alert('Please select an option');
       }
       return true;
    }
   </script>: