Javascript Ajax调用总是返回readyState=1和status=0错误
Javascript Ajax Call always returns readyState=1 and status=0 error
我正在设计一个小项目，该项目利用地理编码器并将地址、地址和长度解析为变量，该变量使用AJAX/ASP将值发送到数据库并插入值。
我的问题围绕AJAX调用的readyState和status，它们总是分别返回1和0。我一直在看许多论坛和例子，找到一个类似于我的，并尝试了许多不同的解决方案，但无济于事。如果有人能给我一些建议，我将不胜感激。
这是我的接口代码，问题围绕着'sendInfo()'和'stateChange()'函数。
Geocoder_experimentAJAX.html
<!DOCTYPE html>
<html>
<head>
<meta name="viewport" content="initial-scale=1.0, user-scalable=no">
<meta charset="utf-8">
<title>Geocoding service</title>
<style type="text/css">
a.normal:link {text-decoration:none;}
p.rightcol {padding-left:1400px}
div.header {
padding: 0.5em;
color: blue;
background-color: #D0F5A9;
clear: left;
}
div.footer {
padding: 0.5em;
color: white;
background-color: #31B404;
clear: left;
}
html, body, #map-canvas {
height: 100%;
margin: 1px;
}
#panel {
width: 350px;
font-family: Arial, sans-serif;
font-size: 13px;
float: right;
margin: 10px;
}
</style>
<script src="https://maps.googleapis.com/maps/api/js?v=3.exp&signed_in=true"></script>
<script>
var geocoder;
var map;
var markers = [];
var drag = false;
var latLong;
var primeMarker;
var newlat
var newlon
//Creates geocoder and map.
function initialize() {
geocoder = new google.maps.Geocoder();
var mid = new google.maps.LatLng(45.4214, -75.6919);
var mapOptions = {
zoom: 12,
center: mid
}
map = new google.maps.Map(document.getElementById('map-canvas'), mapOptions);
}
//Geocodes address provided by user and displays Lat/Long and Full Address.
function codeAddress() {
address = document.getElementById('address').value;
geocoder.geocode( { 'address': address}, function(results, status) {
if (status == google.maps.GeocoderStatus.OK) {
if (results.length > 1) {
document.getElementById("Multi").innerHTML = "Multiple matches of that address, please select the best match from the list below.";
removeOptions(document.getElementById("myList"));
var opt = document.createElement("option");
var select = document.getElementById("myList");
opt.text = "Please Choose Address";
opt.value = '';
select.options[0] = new Option(opt.text,opt.value);
for (var i = 0; i < results.length-1;i++) {
opt.text = results[i].formatted_address;
opt.value = results[i].formatted_address;
select.options[select.options.length] = new Option(opt.text,opt.value);
}
}
else {
removeOptions(document.getElementById("myList"));
document.getElementById("Multi").innerHTML = "";
map.setCenter(results[0].geometry.location);
map.setZoom(17);
latLong = results[0].geometry.location;
var addy = results[0].formatted_address;
var addy2 = addy.toString();
document.getElementById("fmtAddress").value=addy2;
marker = addMarker(results[0].geometry.location, drag);
document.getElementById("latbox").value = primeMarker.getPosition().lat();
document.getElementById("lngbox").value = primeMarker.getPosition().lng();
}
}
else if( document.getElementById('address').value == "" || document.getElementById('address').value == null) {
alert('Address box is emtpy, cannot geocode a blank address. Please fill in your address.');
}
else {
alert('Geocode was not successful for the following reason: ' + status);
}
});
}
// Add a marker to the map.
function addMarker(location, drag) {
marker = new google.maps.Marker({
position: location,
map: map,
draggable: drag
});
primeMarker = marker;
markers.push(marker);
}
// Allows the user to edit the position of the marker.
function moveMarker() {
if (markers.length == 0) {
alert('There is no marker to edit. Please insert address and click "Geocode" to produce a marker.');
}
else {
drag = true;
clearMarkers();
addMarker(latLong, drag);
google.maps.event.addListener(primeMarker, 'dragend', function (event) {
newlat = this.getPosition().lat();
newlon = this.getPosition().lng();
document.getElementById("latbox").value = newlat;
document.getElementById("lngbox").value = newlon;
});
}
}
// Sets the map on all markers in the array.
function setAllMap(map) {
for (var i = 0; i < markers.length; i++) {
markers[i].setMap(map);
}
}
// Removes the markers from the map, but keeps them in the array.
function clearMarkers() {
setAllMap(null);
}
// Remove all items in listbox
function removeOptions(selectbox) {
var i;
for(i=selectbox.options.length-1;i>=0;i--){
selectbox.remove(i);
}
}
// Gets full address from list and sends it to codeAddress()
function newAddress() {
var x = document.getElementById("myList").selectedIndex;
document.getElementById("address").value = document.getElementById("myList").options[x].text;
codeAddress();
}
// Checks for and disables draggable marker, and checks that values to be sent to database aren't empty
function validateForm() {
if (typeof primeMarker != 'undefined')
primeMarker.setDraggable(false)
var w = document.forms["myForm"]["address"].value;
var x = document.forms["myForm"]["addy"].value;
var y = document.forms["myForm"]["lat"].value;
var z = document.forms["myForm"]["lng"].value;
if (x==null || x=="" || w==null || w=="") {
alert("The address text box is empty. You might not have entered an address and clicked the 'Geocode' button.");
return false;
}
else if (y==null || y=="" || z==null || z=="") {
alert("The latitude and/or longitude text box is empty. You might not have entered an address and clicked the 'Geocode' button.");
return false;
}
else {
sendInfo();
}
}
function sendInfo(){
if (window.XMLHttpRequest){
// code for IE7+, Firefox, Chrome, Opera, Safari
xmlhttp=new XMLHttpRequest();
}
else{
// code for IE6, IE5
xmlhttp=new ActiveXObject("Microsoft.XMLHTTP");
}
xmlhttp.open("POST","UpdateAJAX.asp",true);
xmlhttp.onreadystatechange=stateChanged();
xmlhttp.send();
}
function stateChanged() {
if (xmlhttp.readyState==4 && xmlhttp.status==200) {
document.getElementById("txtHint").innerHTML=xmlhttp.responseText;
}
else {
document.getElementById("txtHint").innerHTML="Error with ready state: " + xmlhttp.readyState + " and status: " + xmlhttp.status;
}
}
google.maps.event.addDomListener(window, 'load', initialize);
</script>
</head>
<body onload="document.myForm.reset();">
<div class="header">
<img src="grey_logo.png" height="10%" width="10%"/>
<h1 class="header" align="center" ><font face="arial" color="black">Web-Based Geocoder Service</font></h1>
<p class="rightcol"><a class="normal" href="https://geo.grey.ca/LaunchPage/"> Grey County GIS </a></br>
<a class="normal" href="http://swiftnetwork.ca/">SWIFT Network Survey</a>
</p>
</div>
<div id="panel">
<form name="myForm" action="" >
<b>Enter Address To Be Geocoded:</b>
<input id="address" type="textbox" size="50" name="address">
<input type="button" value="Geocode" onclick="codeAddress()"></br></br>
<p id="Multi"></p>
<b>List of Address Options:</b>
<select id="myList" style="width: 330px;" onchange="newAddress()"-->
<option>List of possible addresses...</option>
</select></br></br>
<b>Full Formatted Address:</b>
<p><input size="50" type="text" id="fmtAddress" name="addy" ></p>
<p><b>Latitude:</b> <input size="20" type="text" id="latbox" name="lat" ></p>
<p><b>Longitude:</b> <input size="20" type="text" id="lngbox" name="lng" ></p>
<b>Edit Marker Location</b></br>
<input type="button" value="Edit Marker" onclick="moveMarker()"></br></br>
<b>Save New Location</b></br>
<button type="button" onclick="return validateForm()">Save</button>
<div id="txtHint">Response Shown Here...</div>
</form>
</div>
<div id="map-canvas"></div>
<div class="footer" align="center">COPYRIGHT 2015 GREY COUNTY GIS. ALL RIGHTS RESERVED</div>
</body>
</html>
这是我调用的. asp文件执行插入到数据库中，它工作得很好，因为我能够在没有AJAX的情况下插入值，但我似乎无法让AJAX完全工作。
Update.asp
<%
conn = Server.CreateObject("ADODB.Connection");
conn.Open("DRIVER={Microsoft Access Driver (*.mdb)};DBQ=" + Server.MapPath("Project.mdb"));
var addy=Request.Form("addy");
var lat=Request.Form("lat");
var lng=Request.Form("lng");
var sql="INSERT INTO Location_Info (Address,Latitude,Longitude)"
sql= sql + " VALUES "
sql= sql + "('" + addy + "',"
sql= sql + "'" + lat + "',"
sql= sql + "'" + lng + "')"
rs = conn.Execute(sql);
Response.Write("Your record has been placed into the database.");
rs.Close();
conn.Close();
%>
xmlhttp.onreadystatechange=stateChanged();
并不像你想象的那样——它会调用stateChanged，将其求值为undefined，然后将undefined赋值给.onreadystatechange，这告诉xmlhttp它不必关心就绪状态的变化。
你想把你的函数赋值给.onreadystatechange，而不是它的结果:
xmlhttp.onreadystatechange=stateChanged;
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