表单已禁用选择选项作为默认选项而不发送任何要验证的内容

问题描述：

I have a form like so:

<select name="employment">
    <option disabled="" selected="">-- What is your employment status --</option>
    <option value="employed">Employed</option>
    <option value="self_employed">Self Employed</option>
</select>

In PHP I am running through each of the $_POST variables and then checking if they have a value. If not I then add that field to the array for an error message.

The issue is that if I leave the default 'disabled' message selected nothing is passed through a post value so theres nothing for me to validate.

If I print_r my $_POST variable then it contains no 'employment' field unless I select an option.

How can I solve this?

我有一个这样的表格： p>

 ＆lt; select  name =“employment”＆gt; 
＆lt; option disabled =“”selected =“”＆gt;  - 您的就业身份是什么 - ＆lt; / option＆gt; 
＆lt; option value =“employ”＆gt; Employed＆lt;  / option＆gt; 
＆lt; option value =“self_employed”＆gt; Self Employed＆lt; / option＆gt; 
＆lt; / select＆gt; 
  code>  pre> 
 
 在PHP中我正在运行 每个$ _POST变量然后检查它们是否有值。 如果不是，那么我将该字段添加到数组中以获取错误消息。 p> 
 
 
问题是，如果我选择默认的“禁用”消息，则不会通过帖子值传递任何内容，因此没有任何内容 让我验证。 p> 
 
 
如果我print_r我的$ _POST变量，那么除非我选择一个选项，否则它不包含'就业'字段。 p> 
 
 
怎么能 我解决了这个问题？ p> 
  div>

答

<select name="employment">
    <option disabled selected>-- What is your employment status --</option>
    <option value="employed">Employed</option>
    <option value="self_employed">Self Employed</option>
</select>

disabled attribute

The disabled attribute is a boolean attribute.
When present, it specifies that an option should be disabled
A disabled option is unusable and un-clickable.

Syntax:

<select disabled>

Not

<select disabled="">

In case of XHTML, syntax differs like

<select disabled="disabled">

hidden attribute

So, If you want to validate it. Use hidden in option.

<select name="employment">
    <option hidden>-- What is your employment status --</option>
    <option value="employed">Employed</option>
    <option value="self_employed">Self Employed</option>
</select>

When, nothing got selected, then it will output as -- What is your employment status --

<?php
echo $Employment=$_POST['employment'];
?>

Output: -- What is your employment status --

So, Now you can easily use your validation in dropdown

For more info, click disabled attribute - W3 Schools

答

Try this:

 <select name="employment">
        <option disabled="" selected="" value ="">-- What is your employment status --</option>
        <option value="employed">Employed</option>
        <option value="self_employed">Self Employed</option>
    </select>

PHP:

if(empty($_POST['employment'])){
  return false;
}else {
  // I got value;
}

表单已禁用选择选项作为默认选项而不发送任何要验证的内容

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