GDownloadUrl replacement in Gmap V3

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?

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);
}