<选择>下拉列表默认值 [英] <select> dropdown default value

问题描述

我有这个代码：

  if（isset（$ _ POST ['search']））
 { 
 $ res1 = mysql_query（SELECT * FROM aircraft where acode ='$ _POST [ac]'）or die（mysql_error（））; 
 while（$ row = mysql_fetch_array（$ res1））
 {
 $ airc = $ row ['acode']; 
 $ amode = $ row ['amodel']; 
 $ stat = $ row ['status']; 
 $ rem = $ row ['remarks']; 
 
 echo< center>< table>< form name = \frmMain\method = \post\> 
< tr>< ; td>< font face = consolas>< b>飞机代码：< / b>< / font>< / td>< td>< input type = text name = arc value ='$ airc 'readonly = readonly>< / td>< / tr> 
< tr>< td>< font face = consolas>< b>飞机型号：*< / b>< /字体>< / td>< td>< input type = text name = am value ='$ amode'>< / td>< / tr> 
< tr>< td> < font face = consolas>< b>状态：*< / b>< / font>< / td>< td>< input type = text name = st value ='$ stat'> < / td>< / tr> 
< tr>< td>< font face = consolas>< b>备注：*< / b>< / font>< / td> ;< td>< input type = text name = rm value ='$ rem'>< / td>< / tr>< / table>; 
} 
} 
  

在提交搜索按钮时，此代码显示数据来自飞机台。允许用户使用（*）符号更新数据。

由于默认情况下的状态（可用，不可用），我更改了此

< tr>< td>< font face = consolas>< b>状态：*< / b>< / font>< / td>< td>< input type = text name = st value ='$ stat'>< / td>< / tr>

< tr>< td>< font face = consolas>< b>状态：*< / b>< / font>< ; / td>< td>< select name = st>
< option value = Available> Available< / option>
< option value ='不可用'>不可用< / option>
< / select>< / td>< / tr>

但是我想让下拉菜单设置为默认值取决于 $ stat = $ row ['status']; ，因为这是一个更新表单。如果正在检索的数据的状态为可用，则下拉列表的默认值为可用。我该如何实现呢？我试过< select name = status value ='$ stat'> ，但它不起作用。任何帮助将不胜感激。谢谢！

解决方案

只需将 selected =selected您的 $ row ['status'] ，

 <选项=selectedvalue =available> Available< / option> 
  

I have this code:

if(isset($_POST['search']))
{
    $res1=mysql_query("SELECT * FROM aircraft where acode = '$_POST[ac]'") or die(mysql_error());
    while($row=mysql_fetch_array($res1))
    {
        $airc=$row['acode'];
        $amode=$row['amodel'];
        $stat=$row['status'];
        $rem=$row['remarks'];

    echo "<center><table><form name=\"frmMain\" method=\"post\"> 
        <tr><td><font face=consolas><b>Aircraft Code:</b></font></td><td><input type=text name=arc value='$airc' readonly=readonly></td></tr>
        <tr><td><font face=consolas><b>Aircraft Model:*</b></font></td><td><input type=text name=am value='$amode'></td></tr>
        <tr><td><font face=consolas><b>Status:*</b></font></td><td><input type=text name=st value='$stat'></td></tr>
        <tr><td><font face=consolas><b>Remarks:*</b></font></td><td><input type=text name=rm value='$rem'></td></tr></table>";
    }
}

On submit 'search' button, this code displays the data from aircraft table. The user is allowed to update the data with the (*) sign.

Since the Status are the following by default (Available, Not Available), I changed this

<tr><td><font face=consolas><b>Status:*</b></font></td><td><input type=text name=st value='$stat'></td></tr>

to this,

<tr><td><font face=consolas><b>Status:*</b></font></td><td><select name=st> <option value=Available>Available</option> <option value='Not Available'>Not Available</option> </select></td></tr>

But I want the dropdown to have it's default value depending on $stat=$row['status']; since this is an update form. If the data being retrieved has it's status 'Available', then the dropdown should have it's default value as 'Available'. How can I achieve that? I tried <select name=status value='$stat'> but it doesn't work. Any help will be appreciated. Thanks!

解决方案

Just put selected="selected" on the option depending on your $row['status'],

<option selected="selected" value="available">Available</option>

这篇关于<选择>下拉列表默认值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IT屋！