php 在 codeigniter form_dropdown 中添加禁用选项
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Adding disabled option in codeigniter form_dropdown
提问by beholder
I'm trying to figure out how to add a disabled option in my dropdown, using codeIgniter. New to CI, and I've tried googling it a bit, but couldn't find an answer.
我试图弄清楚如何使用 codeIgniter 在我的下拉列表中添加禁用选项。CI 的新手，我试过在谷歌上搜索一下，但找不到答案。
My code for a dropdown looks like this:
我的下拉代码如下所示：
echo form_dropdown('category', array('0' => 'Choose a category...') + $categories, '0');
This gives me a dropdown with all my options from the variable $categories, with "Choose a category..." (value 0) at top. Now how to I make the first one disabled? I know how to make it select a specific one, which I've set it to do here.
这给了我一个下拉列表，其中包含变量 $categories 中的所有选项，顶部有“选择一个类别...”（值 0）。现在如何禁用第一个？我知道如何让它选择一个特定的，我在这里设置了它。
Can anyone help me? Thanks
谁能帮我？谢谢
回答by bubjavier
I know this is an old post, but in the current version of CI, I can do a little (sql-injection-like) trick by appending " disabled="disabledto the keys of the option I would like to disable.
我知道这是一篇旧帖子，但在当前版本的 CI 中，我可以通过附加" disabled="disabled到我想禁用的选项的键来做一些（类似于 sql 注入）的技巧。
$categories['0'] = '(Select Category)';
$categories['1'] = 'Category 1';
$categories['2" disabled="disabled'] = 'Restricted Category';
$categories['3'] = 'Category 3';
echo form_dropdown('category', $categories, '0');
I am not sure if this is a bug of CI's form_helper, since it does not do any escaping or sanitizing function for the dropdown key/values. For the mean time, to be safe, just make sure your keys and values wont be coming from any user-based input.
我不确定这是否是 CI 的 form_helper 的错误，因为它不会对下拉键/值执行任何转义或清理功能。同时，为了安全起见，只需确保您的键和值不会来自任何基于用户的输入。
回答by gazdagergo
If you have a few static options only the $options variable can be a simple string too, containing the options in html format, like this:
如果您有几个静态选项，则 $options 变量也可以是一个简单的字符串，包含 html 格式的选项，如下所示：
$options = "
<option value=0 disabled>Select Category</option>
<option value=1>Category 1</option>
<option value=2>Category 2</option>";
echo form_dropdown('category', $options, '0');
回答by Vipin Kr. Singh
Just add the fourth param $extra to your dropdown as a string like this 'disabled=disabled' as explained in CI Docs at https://codeigniter.com/user_guide/helpers/form_helper.html#available-functions
只需将第四个参数 $extra 作为这样的字符串添加到您的下拉列表中，如https://codeigniter.com/user_guide/helpers/form_helper.html#available-functions中 CI Docs 中所述
echo form_dropdown('category', array('0' => 'Choose a category...') + $categories, '0', 'disabled=disabled');
回答by toopay
If you still want to use form_helper, you always can extends helper file and make 'disable' tag available. Create MY_Form_helper.php and put that under helper directory, then define function form_dropdown in that custom helper, then it will overide the form helper behaviour.
如果你仍然想使用 form_helper，你总是可以扩展帮助文件并使“禁用”标签可用。创建 MY_Form_helper.php 并将其放在 helper 目录下，然后在该自定义助手中定义函数 form_dropdown，然后它将覆盖表单助手的行为。
回答by Whole Hat
<?php echo validation_errors(); ?>
<?php echo form_open(''); ?>
<?php echo form_label('Gender:'); ?>
<?php echo form_dropdown(array('id'=>'selectinform', 'name'=>'gender', 'options'=>array('1'=>'Select', '2'=>'2','3'=>'3'), 'selected'=>'1')); ?>
<?php echo form_submit(array('id'=>'submit', 'value'=>'submit')); ?>
<?php echo form_close(); ?>
<script>
$(document).ready(function(){
$("#selectinform option:first").attr('disabled', 'disabled');
});
</script>
回答by sqwk
From the CI user guide at http://codeigniter.com/user_guide/helpers/form_helper.html:
来自http://codeigniter.com/user_guide/helpers/form_helper.html的 CI 用户指南：
If you would like the opening to contain additional data, like an id attribute or JavaScript, you can pass it as a string in the fourth parameter:
如果您希望开头包含其他数据，例如 id 属性或 JavaScript，您可以将其作为字符串传递到第四个参数中：
So you code becomes:
所以你的代码变成：
echo form_dropdown('category', array('0' => 'Choose a category...') + $categories, '0', 'disabled="disabled"');
However, unless you are a PHP fanatic or are using CSRF protection through the form helper I would just type out your form html yourself. It is the same amount of text and you are using less functions.
但是，除非您是 PHP 狂热者或通过表单助手使用 CSRF 保护，否则我只会自己输入您的表单 html。它是相同数量的文本，您使用的功能较少。
回答by igolka97
Solution:
解决方案：
Change the 437th string of form_helper.php:
更改 的第 437 个字符串form_helper.php：
from
从
.(in_array($key, $selected) ? ' selected="selected"' : '').'>'
to
到
.(in_array($key, $selected) ? ' disabled="disabled"' : '').'>'
and use selectedfeature as disabled. Looks like an lifehack, but it works
并将selected特征用作disabled. 看起来像一个救生员，但它有效
