如何在提交后显示选定的选项值 [英] How to show selected option value after submit

问题描述

我有一个使用foreach循环来查询数据的html选择。默认值为空，因此当页面加载时，它会显示未经过滤的查询。它看起来像这样

  $ client = $ wpdb-> get_results（SELECT string FROM`file` WHERE 
`code` = 001）; 
 
 echo'按客户端过滤：'; 
 echo'< select name =client_list>< option value =>< / option>'; 
 foreach（$ client as $ key => $ row）{
 $ value = $ row-> string; 
 echo 
'< option value ='。$ value。'>'
。$ value。 < /选项>; 
} 
 $ client = $ _GET ['client_list']; 
 echo'< / select>'; 
  

它用作基于所选选项值显示数据的过滤器。它过滤的表看起来像这样

  | client |文件| 
 | ------ | ------------------- | 
 | client1 | file00000 | 
 | client2 | file00002 | 
  

现在，当我点击submit并查看过滤后的查询结果是正确的时，我也会看到默认选项值而不是选择的值来过滤html选择中的数据。如何修复这个？

解决方案

 
保留$ _POST var的值，然后添加选定的属性以保留并将其设置为该选定值。  echo'按客户端过滤：'; 
 echo'< select name =client_list>< option value =>< / option>'; 
 foreach（$ client as $ key => $ row）{
 $ value = $ row-> string; 
 if（$ _ GET ['client_list'] == $ value）{
 echo'< option value ='。$ value。'selected>'。$ value。 < /选项>; 
} else {
 echo'< option value ='。$ value。'>'。$ value。 < /选项>; 
} 
 $ client = $ _GET ['client_list']; 
 echo'< / select>'; 
  

I have an html select that is populated with data from a query using a foreach loop. The default value is empty, so when the page loads, it displays an unfiltered query. It looks something like this

$client = $wpdb->get_results("SELECT string FROM `file` WHERE 
`code` = 001");

echo 'Filter by client: ';
  echo '<select name="client_list"><option value=""></option>';
  foreach ($client as $key => $row) {
    $value = $row->string;
    echo 
  '<option value='.$value.'>'
  .$value. '</option>';
  }
  $client = $_GET['client_list'];
  echo '</select>'; 

It serves as a filter to display data based on the selected option value. The table that it filters looks something like this

   |client  | file              | 
   |------  |-------------------|
   |client1 | file00000         |
   |client2 | file00002         |

Now when I hit submit and see the filtered query results which are correct, I also see the default option value instead of the one selected to filter the data in the html select. How can I fix this?

解决方案

Retain the value from your $_POST var and then add the selected attribute to retain and have it set to that selected value:

echo 'Filter by client: ';
  echo '<select name="client_list"><option value=""></option>';
  foreach ($client as $key => $row) {
    $value = $row->string;
    if($_GET['client_list'] == $value){ 
       echo '<option value='.$value.' selected>'.$value. '</option>';
    }else{
       echo '<option value='.$value.'>'.$value. '</option>';
    }
  $client = $_GET['client_list'];
  echo '</select>'; 

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