$_POST 禁用选择

$_POST for disabled select($_POST 禁用选择)

问题描述

<select class="txtbx1" name="country" disabled>

<option value='FR' >FRANCE</option><option value='CH' selected>SWITZERLAND</option>
</select>

上面的代码在一个方法是post的表单中

the above code is inside a form whose method is post

但是 echo $_POST['country'] 没有显示任何东西..另一方面，如果我从 select $_POST['country'] 中删除 disabled正确的结果

but echo $_POST['country'] is showing nothing.. on the other hand if I remove disabled from select $_POST['country'] is showing the correct result

推荐答案

这就是 disabled 属性的工作原理.当表单控件被禁用时，提交表单时将忽略该值，并且键不会出现在 $_POST(或 $_GET)中.

This is how the disabled attribute works. When a form control is disabled, the value will be ignored when the form is submitted and the key will not be present in $_POST (or $_GET).

如果您希望该值出现在提交的数据中，但又不希望用户能够更改页面上的值(我想这就是您想要实现的)，请使用 readonly="readonly" 而不是 disabled="disabled".

If you want the value to be present in the submitted data, but you don't want the user to be able to change the value on the page (which I imagine is what you are trying to acheive) use readonly="readonly" instead of disabled="disabled".

编辑

元素没有 readonly 属性.上述信息仍然将适用于s和</code>s.<em class="showen"></em></p> <p class="en">The <code><select></code> element does not have a <code>readonly</code> attribute. The above information still stands as it <em>will</em> work for <code><input></code>s and <code><textarea></code>s.</p> <p class="cn">此处问题的解决方案是禁用选择并使用隐藏输入将值发送回服务器 - 例如<em class="showen"></em></p> <p class="en">The solution to your problem here would be to disable the select and use a hidden input to send the value back to the server - e.g.</p> <p class="cn">启用选择时:</p> <pre><code class='language-php'><select class="txtbx1" name="country"> <!-- options here --> </select> </code></pre> <p class="cn">...当它被禁用时:</p> <pre><code class='language-php'><select class="txtbx1" name="country_disabled" disabled="disabled"> <!-- options here, with appropriate value having `selected="selected"` --> </select> <input type="hidden" name="country" value="value_of_field" /> </code></pre> <p>这篇关于$_POST 禁用选择的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持编程学习网！</p>