我正在尝试在表单中进行级联选择,但我无法让它工作。我的选择元素中的 onChange() 似乎不会触发。
php
$flight_sql = "SELECT * FROM wp_flr_flights";
$flight_result = mysql_query($flight_sql);
echo '<select name="location" id="select-location onChange="changeSecond(this.value)">';
echo '<option value="">Select</option>';
while ($flt_loc_rows = mysql_fetch_assoc($flight_result)) {
$loc_id = $flt_loc_rows["location_id"];
$loc_name = $flt_loc_rows["location_name"];
echo '<option value="'.$loc_id.'">'.$loc_name.'</option>';
}
echo '</select>';
javascript
function changeSecond(first){
alert('dasda');
var xmlhttp;
if (window.XMLHttpRequest){// code for IE7+, Firefox, Chrome, Opera, Safari
xmlhttp=new XMLHttpRequest();
} else {// code for IE6, IE5
xmlhttp=new ActiveXObject("Microsoft.XMLHTTP");
}
xmlhttp.onreadystatechange=function(){
if (xmlhttp.readyState==4 && xmlhttp.status==200){
var res=xmlhttp.responseText;
document.getElementById("second").innerHTML=res;
}
}
xmlhttp.open("GET","reservations-plane.php?first="+first,true);
xmlhttp.send();
}
预订-plane.php
global $wpdb, $page_url;
$location=mysql_real_escape_string($_REQUEST["first"]);
echo $userid.'ddd';
$flight_sql = "SELECT ".$location." FROM wp_flr_flights GROUP BY ".$location;
$flight_result = mysql_query($flight_sql);
echo '<select name="plane_type_choose">';
while ($flt_plane_rows = mysql_fetch_row($flight_result)) {
$plain_id = $flt_plane_rows["plane_id"];
$plane_type = $flt_plane_rows["plane_type"];
echo '<option value="'.$flt_plane_rows[0].'">'.$flt_plane_rows[0].'</option>';
}
echo '</select>';