GDownloadUrl replacement in Gmap V3 - php

Question

I want to send and receive data from php files. What is the best possible way to do this?
What is the best replacement for GDownloadUrl in Google Map V3?
Here is my existing function to check if I inserted successfully:
function checkSaveGeoFenceData(data,code)
{
//var geoFenceDataJson = eval('(' + json + ')');
if(code===200)
{
//alert("JSON VALUE : "+data+"test");
if(data=="SMGFE\n")
{
alert("Geo Fence " +
document.getElementById("geoFenceName").value +
" Already Exist");
}
else {
alert("Successfully Inserted");
window.opener.location.reload();
window.close();
}
}
else
{
alert("Fail to insert");
}
}
Existing function to grab data from php:
function processtViewData(json)
{
dataJson = eval('(' + json + ')');
var totalData = dataJson.data1.length;
}

Answer 1

There is no equivalent to GDownloadUrl in the API V3. Loading data via AJAX is a general javascrip task that is not specific to the API or to Google Maps.
Here's a function that will do the same:
function ajaxLoad(url,callback,postData,plain) {
var http_request = false;
if (window.XMLHttpRequest) { // Mozilla, Safari, ...
http_request = new XMLHttpRequest();
if (http_request.overrideMimeType && plain) {
http_request.overrideMimeType('text/plain');
}
} else if (window.ActiveXObject) { // IE
try {
http_request = new ActiveXObject("Msxml2.XMLHTTP");
} catch (e) {
try {
http_request = new ActiveXObject("Microsoft.XMLHTTP");
} catch (e) {}
}
}
if (!http_request) {
alert('Giving up :( Cannot create an XMLHTTP instance');
return false;
}
http_request.onreadystatechange = function() {
if (http_request.readyState == 4) {
if (http_request.status == 200) {
eval(callback(http_request));
}
else {
alert('Request Failed: ' + http_request.status);
}
}
};
if (postData) { // POST
http_request.open('POST', url, true);
http_request.setRequestHeader('Content-Type', 'application/x-www-form-urlencoded');
http_request.setRequestHeader("Content-length", postData.length);
http_request.send(postData);
}
else {
http_request.open('GET', url, true);
http_request.send(null);
}
}
Make sure your server responds with a content-type:text/plain header
Call it with postdsata:
var postdata = 'a=1&b=2';
ajaxLoad(serverUrl,myCallback,postdata);
function myCallback(req){
var txt = req.responseText;
// optional, if needed to evaluate JSON
eval(txt);
}