我正在尝试对数据库执行搜索。我的目标是使用搜索表单并使用ajax来请求PHP返回结果。问题是，我没有在ajax handleRequest函数中得到响应。另外，我如何从php发送回xml响应。这是我的代码。抱歉杂乱无章。
的index.php
<!doctype>
<html lang="en">
<head>
<title>Test Form</title>
<script src="js/validate.js"></script>
</head>
<body onload="setfocus();">
<span id="error"></span>
<form id ="searchForm" method="POST" action="/php/validate.php"
onsubmit="event.preventDefault(); process();">
<input type="text" placeholder="Eg. Canada" name="country" id="country_id"
onblur="validate(this.id, this.value);" required/>
<br />
<input type="text" placeholder="Eg. Toronto" name="city" id="city_id"
onblur="validate(this.id, this.value);" required/>
<br />
<label for="featues">Features</label>
WiFi<input type="checkbox" name="wifi" value="wifi" />
TV<input type="checkbox" name="tv" value="tv" />
Breakfast<input type="checkbox" name="breakfast" value="breakfast" />
<br />
<label>Room Type</label>
<select name="roomtype">
<option name="mastersuite" value="mastersuite">Master Suite</option>
<option name="suite" value="suite">Suite</option>
<option name="largeroom" value="largeroom">Large Room</option>
<option name="smallroom" name="smallroom">Small Room</option>
</select>
<br />
<label>Price Range</label>
<input type="text" name="minrange" id="price_min_range_id"
onblur="validate(this.id, this.value);" />
<input type="text" name="maxrange" id="price_max_range_id"
onblur="validate(this.id, this.value);" />
<br />
<label>Stay date</label>
<br />
<label>Arrival Date</label>
<input type="date" name="arrival" id="arrival" placeholder="MM/DD/YYYY"
onblur="validate(this.id, this.value);" required/>
<label>departure Date</label>
<input type="date" name="departure" id="departure" placeholder="MM/DD/YYYY"
onblur="validate(this.id, this.value);" />
<br />
<input type="submit" name="search" value="search">
</form>
<div id="responseDiv"></div>
</body>
</html>
validate.js
var xmlHttp;
//var serverAddr;
//var error;
var response;
function createHttpRequestObject(){
var responseObj;
//for IE
if(window.ActiveX){
var vers = new Array("MSXML2.XML.Http.6.0",
"MSXML2.XML.Http.5.0",
"MSXML2.XML.Http.4.0",
"MSXML2.XML.Http.3.0",
"MSXML2.XML.Http.2.0",
"Microsoft.XMLHttp");
for(var i=0; i<vers.length && !responseObj; i++){
try{
responseObj = new ActiveXObject(vers[i]);
}catch(e){
responseObj = false;
}
}
}
else{ //for all other browser
try{
responseObj = new XMLHttpRequest();
}catch(e){
responseObj = false;
}
}
if(!responseObj || responseObj === false){
alert("Failed to create response object");
}
else{
return responseObj;
}
}
function process(){
xmlHttp = createHttpRequestObject();
if(xmlHttp){
var firstname = encodeURIComponent(
document.getElementById("firstname").value);
var roomtype = encodeURIComponent(
document.getElementById("roomtype").options[
document.getElementById("roomtype").selectedIndex].value);
var minrange = encodeURIComponent(
document.getElementById("price_min_range_id").firstChild.value);
var maxrange = encodeURIComponent(
document.getElementById("price_max_range_id").firstChild.value);
var city = encodeURIComponent(document.getElementById("city_id").firstChild.value);
var country = encodeURIComponent(
document.getElementById("country_id").firsChild.value);
var arrivalDate = encodeURIComponent(
document.getElementById("arrivalDate").value);
var departureDate = encodeURIComponent(
document.getElementById("departureDate").value);
var amenity_breakfast = encodeURIComponent(
document.getElementByName("Breakfast").checked);
var amenity_tv = encodeURIComponent(
document.getElementByName("TV").checked);
var amenity_wifi = encodeURIComponent(
document.getElementByName("wifi").checked);
//get other filed values
xmlHttp.open("POST", "php/validate.php", true);
xmlHttp.setRequestHeader("Content-type", "application/x-www-form-urlencoded");
xmlHttp.onreadystatechange = handleResponse;
xmlHttp.send("firstname=" + firstname + "&roomtype="+ roomtype + "&country="+ country + "&city=" + city + "&minrange=" + minrange + "&maxrange=" + maxrange + "&arrivalDate="+arrivalDate + "&departureDate="+ departureDate + "&breakfast="+
amenity_breakfast + "&tv="+amenity_tv + "&wifi="+ amenity_wifi);
}
else{
alert("Error connecting to server");
}
}
function handleResponse(){
var docdiv = document.getElementById("responsediv");
var table = "";
if(xmlHttp.readyState==4){
if(xmlHttp.status==200){
//the search info as xml
//var response = xmlHttp.responseXML;
response = xmlHttp.responseXml;
if(!response || response.documentElement){//catching errors with IE, Opera
alert('Invalide Xml Structure:\n'+ response.responseText);
}
var rootNodeName = response.documentElement.nodeName;
if(rootNodeName=="parseerror"){//catching error with firefox
alert('Invalid Xml Structure:\n');
}
var docroot = response.documentElement;
var responseroot = docroot.getElementByTagName("response");
//extracting all hotel values from search
var hotels = new Array(responseroot.getElementByTagName("hotels"));
table = "<table border='1px solid' margin='2px' padding='5px'>";
//docdiv.appendChild(table);
for(var i=0; i<hotels.legnth; i++){
var hotelroot = hotels[i].getElementTagName("name");
var hotelname = hotelroot.firstChild.data;
var hoteladd = hotels[i].getElementByTagName("hoteladd").firstChild.data;
var reqRoomNum = hotels[i].getElementTagName("reqroom").firsChild.data;
table +="<tr>";
//row = table.append(row);
//name column
table += "<td>";
table += hotelname + "</td>";
//address column
table += "<td>";
table += hoteladd + "</td>";
//desired roomttype
table += "<td>";
table += reqRoomNum + "</td>";
//docdiv.createElement("</tr>");
table += "</tr>";
}
table += "</table>";
}
docdiv.innerHTML= table;
}
}
function validate(fieldId, value){
//var error = 0;
//var errortext = '';
switch(fieldId){
/*case 'name':
var chk_name_regex = /^[A-Za-z ]{3,30}$/;
if(value.length<4 &&!chk_name_regex.test(value)){
print_error('Name format wrong',fiedlId);
}
break;*/
case 'country_id':
var chk_country_regex = /^[A-Za-z- ]{4,50}$/;
if(value.length<4 && !chk_country_regex.test(value)){
print_error('Country name format wrong',fieldId);
}
break;
case 'city_id':
var chk_city_regex = /^[A-Za-z- ]{4,50}$/;
if(value.length<4 && !chk_city_regex.test(value)){
print_error('City name format wrong',fieldId);
}
break;
case 'price_min_range_id':
var r = value;
if(r<0){
print_error('Min range must be zero atleast',fieldId);
}
break;
case 'price_max_range_id':
r = value;
if(!(r>=0 && r>=document.getElementById('price_min_range_id').firstChild.value)){
print_error('Max index must be atleast zero or greater than min',fieldId);
}
break;
case 'arrival':
var arrival = value;
var datecomp = arrival.explode("/");
var monthOk = parseInt(datecomp[0])>=1 && parseInt(datecomp[0])<=12;
var getleapday = parseInt(datecomp[2]) % 4===0 &&
parseInt(datecomp[2])%100===0 && parseInt(datecomp[2])%400===0;
var dayOk = parseInt(datecomp[1])>=1 && parseInt(datecomp[2])<=31;
var yearOk = parseInt(datecomp[2])>2015;
if(monthOk && dayOk && yearOk){
print_error('Date format is wrong',fieldId);
}
break;
}
}
function print_error(msg, fieldId){
var errorSpan = document.getElementById('error');
errorSpan.innerHTML = "<p text-color='red'>" + msg + "</p>";
document.getElementById(fieldId).focus();
}
function setfocus(){
document.getElementById('country_id').focus();
}
validate.php
<?php
function just_check(){
print_r($_POST);
}
just_check();
//config script
require_once('config.php');
//vars for all the fileds
$country = $city = $wifi = $tv = $breakfast = $minrange = $maxrange
= $arrival = $departure = $roomtype = '';
//server side input validation
if($_SERVER['REQUEST_METHOD']=='POST'){
$country = inputValidation($_POST['country']);
$city = inputValidation($_POST['city']);
$minrange = inputValidation($_POST['minrange']);
$maxrange = inputValidation($_POST['maxrange']);
$arrival = inputValidation($_POST['arrivalDate']);
$departure = inputValidation($_POST['departureDate']);
$roomtype = $_POST['roomtype'];
if(isset($_POST['wifi'])){
$wifi = true;
}
if(isset($_POST['tv'])){
$tv = true;
}
if(isset($_POST['breakfast'])){
$breakfast = true;
}
}
//echo $country . " " . $city . '<br >';
//connect to mysql
$db = new mysqli(DB_HOST, DB_USER, DB_PASS, DB_NAME)
or die('Could not connect to db');
//query the database matching fields;
$query = "SELECT hotel_id, hotel_name FROM allhotels WHERE ";
//echo $query . '<br />';
if(isset($country)){
$query .= "(hotel_country='$country') AND";
}
//echo $query . '<br />';
if(isset($city)){
$query .= " (hotel_city='$city') AND";
}
$query = substr($query,0, -4);
// echo $query . '<br />';
$res = $db->query($query);
//echo $query . '<br />';
if(!$res){
echo $db->errno . '->' . $db->error;
}
//setting header to XML
header('ContentType: text/xml');
//creating XML response string"
$dom = new DOMDocument();
$response = $dom->createElement("response");
$dom->appendChild($response);
while($row = $res->fetch_array(MYSQLI_ASSOC)){
//matching room field value for query
$roomfield='';
if($roomtype == 'mastersuite'){
$roomfield = 'hotel_master_suites';
}
else if($roomtype == 'suite'){
$roomfield = 'hotel_suite';
}
else if($roomtype == 'largeroom'){
$roomfield = 'hotel_large_rooms';
}
else{
$roomfield = 'hotel_small_rooms';
}
//query with the roomfield and hotel_id value
$htl_id = $row['hotel_id'];
$subquery = "SELECT hotel_add, $roomfield FROM spechotel WHERE ".
"(hotel_id = $htl_id) AND ($roomfield > 0) AND";
if(isset($wifi)){
$subquery .= " (wifi=1) AND";
}
//echo $subquery . '<br />';
if(isset($tv)){
$query .= " (tv=1) AND";
}
//echo $query . '<br />';
if(isset($breakfast)){
$query .= " (breakfast=1) AND";
}
//echo $query . '<br />';
$subquery = substr($subquery,0, -4);
// echo $query . '<br />';
//echo $subquery . '<br />';
$subrow = $db->query($subquery);
$subrow = $subrow->fetch_array(MYSQLI_ASSOC);
$hotel_header = $dom->createElement("hotels");
$hotel_name = $dom->createElement("name");
$hotel_name->appendChild($dom->createTextNode($row['hotel_name']));
$hotel_add = $dom->createElement("hoteladd");
$hotel_add->appendChild($dom->createTextNode($subrow['hotel_add']));
//$hotel_postal = $hotel_header->apppendChild("hotelpostal");
//$hotel_postal->createTextNode($subrow['']);
$hotel_req_room = $dom->createElement("reqroom");
$hotel_req_room->appendChild($dom->createTextNode($subrow[$roomfield]));
$hotel_header->appendChild($hotel_name);
$hotel_header->appendChild($hotel_add);
$hotel_header->appendChild($hotel_req_room);
}
$xmlString = $dom->saveXML();
//print table
$db->close();
//close connection
//return search
function print_search_result(){
global $xmlString;
echo $xmlString;
}
print_search_result();
function inputValidation($data){
$data = trim($data);
$data = stripslashes($data);
$data = htmlspecialchars($data);
return $data;
}
?>