Javascript 提交表单后,如何保持动态下拉列表的值处于选中状态?
请在提交表单后帮助我显示所选电子邮件。请对以下提到的代码进行详细说明:Javascript 提交表单后,如何保持动态下拉列表的值处于选中状态?,javascript,php,html,Javascript,Php,Html,请在提交表单后帮助我显示所选电子邮件。请对以下提到的代码进行详细说明: <?php $query= mysqli_query($conn," SELECT email FROM register"); $options=""; $result=mysqli_fetch_assoc($query); if(mysqli_num_rows($query) >0) { while($row=mysqli_fetch_array($que
<?php
$query= mysqli_query($conn," SELECT email FROM register");
$options="";
$result=mysqli_fetch_assoc($query);
if(mysqli_num_rows($query) >0)
{
while($row=mysqli_fetch_array($query))
{
$options = $options."<option>$row[0]</option>";
}
}
?>
<select name="email" id="email">
<option value="" disabled="" selected="">SELECT EMAIL</option>
<?php echo $options;?>
</select>
选择电子邮件
您可以通过选择下拉选项来解决此问题
试试这个
<?php
$email = $_POST['email'];
$query= mysqli_query($conn," SELECT email FROM register");
$options="";
$result=mysqli_fetch_assoc($query);
if(mysqli_num_rows($query) >0){
while($row=mysqli_fetch_array($query)){
$options.= '<option '.(($row[0]==$email)?'selected="selected"':"").'>'.$row[0].'</option>';
}
}
?>
<select name="email" id="email">
<option value="" disabled="" selected="">SELECT EMAIL</option>
<?php echo $options;?>
</select>
选择电子邮件
希望这将帮助您您可以通过选择下拉选项来解决此问题
<select name="email" id="email">
<option value="" disabled="" selected="">SELECT EMAIL</option>
<?php
$query= mysqli_query($conn," SELECT email FROM register");
$options="";
$result=mysqli_fetch_assoc($query);
if(mysqli_num_rows($query) >0)
{
while($row=mysqli_fetch_array($query))
{
echo "<option value='<?=$row[0]?>'><?= $row[0]?></option>";
}
}
?>
</select>
试试这个
<?php
$email = $_POST['email'];
$query= mysqli_query($conn," SELECT email FROM register");
$options="";
$result=mysqli_fetch_assoc($query);
if(mysqli_num_rows($query) >0){
while($row=mysqli_fetch_array($query)){
$options.= '<option '.(($row[0]==$email)?'selected="selected"':"").'>'.$row[0].'</option>';
}
}
?>
<select name="email" id="email">
<option value="" disabled="" selected="">SELECT EMAIL</option>
<?php echo $options;?>
</select>
选择电子邮件
希望这对您有所帮助
<select name="email" id="email">
<option value="" disabled="" selected="">SELECT EMAIL</option>
<?php
$query= mysqli_query($conn," SELECT email FROM register");
$options="";
$result=mysqli_fetch_assoc($query);
if(mysqli_num_rows($query) >0)
{
while($row=mysqli_fetch_array($query))
{
echo "<option value='<?=$row[0]?>'><?= $row[0]?></option>";
}
}
?>
</select>
选择电子邮件
选择电子邮件
你在哪里?添加一项检查,检查已发布的表单和已发布的电子邮件是否相同。添加属性已选中顶部选项。您的表单标签在哪里?添加一个检查,检查已发布的表单和已发布的电子邮件是否相同添加属性已选择
顶部选项。先生,我尝试了此代码,但它显示以下错误-解析错误:语法错误,意外“'),请帮助我。亲爱的@gurpretkaur我刚刚编辑了我的anser,替换了此$options的while循环行。='.$row[0]';欢迎亲爱的@gurpretkaursir,我已经尝试了这段代码,但是它显示了以下错误-解析错误:语法错误,意外“'),请帮助我。亲爱的@gurpretkaur,我刚刚编辑了我的anser,替换了这个$options的while循环行。='.$row[0]';欢迎亲爱的@gurpretkaurthanx回答这个问题