我创建了一个从数据库调用值的下拉列表。我有一个问题，当选择下拉选项时，URL保持不变。
这是代码：
<form method="get" action="<?php echo $_SERVER['PHP_SELF']; ?>">
<select name="country" onchange='this.form.submit()'>
<?php $result= mysql_query('SELECT DISTINCT country FROM roaming_testing ORDER BY country ASC'); ?>
<option value="x" selected>Select your destination</option>
<?php while($row= mysql_fetch_assoc($result)) { ?>
<option value="<?php echo htmlspecialchars($row['country']);?>" >
<?php echo htmlspecialchars($row['country']); ?>
</option>
<?php } ?>
<input type="hidden" name="action" value="submit" /><br>
</select>
</form>
<?php
if(isset($_GET["action"]) && $_GET["action"] == "submit") {
$results= $wpdb->get_results("SELECT * FROM roaming_testing WHERE country='$_GET[country]'");
$zones= $wpdb->get_results("SELECT * FROM roaming_rates WHERE zone IN (SELECT zone FROM roaming_testing WHERE country='$_GET[country]')");
$operators_postpaid= $wpdb->get_results("SELECT * FROM roaming_testing WHERE country='$_GET[country]' AND postpaid_roaming=1");
$operators_prepaid= $wpdb->get_results("SELECT * FROM roaming_testing WHERE country='$_GET[country]' AND prepaid_roaming=1");
if (empty($results))
{ echo '<h3 style="color:red;">No Results</h3>';}
else
{foreach ( $results as $result ) {
foreach ( $zones as $zone ){
}}}
?>
<?php
echo '<div class="roaming-header">'.htmlspecialchars($_GET["country"]).'</div>'.'<br>';
if (empty($operators_postpaid)){
echo "
<span style='font-size:21px; font-family:Arial, Helvetica, sans-serif; color:#00abbd; font-weight:bold'>Pay Monthly</span>
<table cellpadding='6' cellspacing='0' border='0' width='100%'>
<tr>
<td>
<p class='rates'>Available soon</p>
</td>
</tr>
<tr><td></td></tr>
<tr><td></td></tr>
<tr><td></td></tr>
<tr><td></td></tr>
<tr><td></td></tr>
<tr><td></td></tr>
<tr><td></td></tr>
</table>
";
}else{
echo "
<table width='620'>
<tr>
<td width='50%'>
<span style='font-size:21px; font-family:Arial, Helvetica, sans-serif; color:#00abbd; font-weight:bold'>Pay Monthly</span>
<table width='310' cellpadding='6' cellspacing='0' border='0' style='border-color:#00abbd; border-width:0px; border-style:solid; padding:3px'>
<tr bgcolor='#eeeeee'>
<td width='160'>
<p class='rates' style='color:#00abbd;'><strong>Call to $result->country</strong></p>
</td>
<td>
<p class='rates'>€ $zone->calling_visiting_country /min</p>
</td>
</tr>
<tr>
<td>
<p class='rates' style='color:#00abbd;'><strong>Call to Malta</strong></p>
</td>
<td>
<p class='rates'>€ $zone->calling_malta/min</p>
</td>
</tr>
<tr bgcolor='#eeeeee'>
<td>
<p class='rates' style='color:#00abbd;'><strong>Call to Zone $result->Zone </strong> </p>
</td>
<td>
<p class='rates'>€ $zone->calling_visiting_country /min</p>
</td>
</tr>
<tr>
<td>
<p class='rates' style='color:#00abbd;'><strong>Calling other Zones</strong></p>
</td>
<td>
<p class='rates'>€ $zone->calling_other_countries /min</p>
</td>
</tr>
<tr bgcolor='#eeeeee'>
<td>
<p class='rates' style='color:#00abbd;'><strong>Receiving Calls</strong></p>
</td>
<td>
<p class='rates'>€ $zone->receiving_call /min</p>
</td>
</tr>
<tr>
<td>
<p class='rates' style='color:#00abbd;'><strong>Data</strong></p>
</td>
<td>
<p class='rates'> € $zone->data</p>
</td>
</tr>
<tr bgcolor='#eeeeee'>
<td>
<p class='rates' style='color:#00abbd;'><strong>SMS</strong></p>
</td>
<td>
<p class='rates'>€ $zone->sms</p>
</td>
</tr>
<tr>
<td>
<p class='rates' style='color:#00abbd;'><strong>MMS</strong></p>
</td>
";
if ( $result->Zone == 1){
echo "<td>
<p class='rates'>€ $zone->data</p>
</td>
</tr>
</table>
";} else{
echo "
<td>
<p class='rates'>€ $zone->mms + €$zone->data</p>
</td>
</tr>
</table>
";}
}
if (empty($operators_prepaid)){
echo "
<td width='50%'>
<span rel='country2' style='font-size:21px; font-family:Arial, Helvetica, sans-serif; color:#a7cf3a; font-weight:bold'>Prepaid & Hybrid</span>
<table width='310' cellpadding='6' cellspacing='0' border='0' style='border-color:#00abbd; border-width:0px; border-style:solid; padding:3px'>
</table>
";
}else{
echo "
<td width='50%'>
<span rel='country2' style='font-size:21px; font-family:Arial, Helvetica, sans-serif; color:#a7cf3a; font-weight:bold'>Prepaid & Hybrid</span>
<table width='310' cellpadding='6' cellspacing='0' border='0' style='border-color:#00abbd; border-width:0px; border-style:solid; padding:3px'>
<tr bgcolor='#eeeeee'>
<td width='160'>
<p class='rates' style='color:#a7cf3a;'><strong>Call to $result->country</strong></p>
</td>
<td>
<p class='rates'>€ $zone->calling_visiting_country /min</p>
</td>
</tr>
<tr>
<td>
<p class='rates' style='color:#a7cf3a;'><strong>Call to Malta</strong></p>
</td>
<td>
<p class='rates'>€ $zone->calling_malta/min</p>
</td>
</tr>
<tr bgcolor='#eeeeee'>
<td>
<p class='rates' style='color:#a7cf3a;'><strong>Call to Zone $result->Zone </strong> </p>
</td>
<td>
<p class='rates'>€ $zone->calling_visiting_country /min</p>
</td>
</tr>
<tr>
<td>
<p class='rates' style='color:#a7cf3a;'><strong>Calling other Zones</strong></p>
</td>
<td>
<p class='rates'>€ $zone->calling_other_countries /min</p>
</td>
</tr>
<tr bgcolor='#eeeeee'>
<td>
<p class='rates' style='color:#a7cf3a;'><strong>Receiving Calls</strong></p>
</td>
<td>
<p class='rates'>€ $zone->receiving_call /min</p>
</td>
</tr>
<tr>
<td>
<p class='rates' style='color:#a7cf3a;'><strong>Data</strong></p>
</td>
<td>
<p class='rates'> € $zone->data</p>
</td>
</tr>
<tr bgcolor='#eeeeee'>
<td>
<p class='rates' style='color:#a7cf3a;'><strong>SMS</strong></p>
</td>
<td>
<p class='rates'>€ $zone->sms</p>
</td>
</tr>
<tr>
<td>
<p class='rates' style='color:#a7cf3a;'><strong>MMS</strong></p>
</td>";
/*------------------------------------------------------------------------------------------------
check for zone 1 for MMS rating
--------------------------------------------------------------------------------------------------*/
if ( $result->Zone == 1){
echo "
<td>
<p class='rates'>€ $zone->data</p>
</td>
";}
else{
echo "
<td>
<p class='rates'>€ $zone->mms + €$zone->data</p>
</td>
";
}
echo "
</tr>
</table>
</table>
";
}
/*------------------------------------------------------------------------------------------------
Loops for Roaming Operators
--------------------------------------------------------------------------------------------------*/
echo "While in $result->country you can use the following networks: <br><br>";
if (empty($operators_postpaid)){
echo "Available networks for Pay Monthly customers<br>";
echo "Service will be available soon<br>";
}else{
echo "Available networks for Pay Monthly customers";
foreach ( $operators_postpaid as $operator_postpaid ){
echo "<li>$operator_postpaid->operator</li>";
}}
echo "<br>";
if (empty($operators_prepaid)){
echo "Available networks for Prepaid customers<br>";
echo "Service will be available soon<br>";
}else{
echo "Available networks for Prepaid customers";
foreach ( $operators_prepaid as $operator_prepaid ){
echo "<li>$operator_prepaid->operator</li>";
}}
我想在网址中写下选项，例如：www.mydomain.com/？country = unitedkingdom
答案 0 :(得分：1)
额外的"位于<form>的操作属性中。删除它。并将方法更改为get
<form method="get" action="<?php echo $_SERVER['PHP_SELF']; ?>">
//elements
</form>
您需要将下拉名称更改为country。即，
<select name="country" onchange='this.form.submit()'>
答案 1 :(得分：0)
你必须在表单中使用GET方法才能做到这一点