Loading google maps asynchronously

Question

I am trying to load my google map asynchronously and it works but it is loading the map in twice. If I remove \"box.onload = initialize;\" this stops that probl

Answer 1

The map appears twice because you're calling initialize twice.

Before fixing that, let's simplify your code a bit. Never let yourself repeat blocks of code like that; instead make it into a common function.

Also, don't load infobox.js from googlecode.com; Google Code is not a CDN. Load your own copy.

So, the code may look like this:

function addScript( url, callback ) {
    var script = document.createElement( 'script' );
    if( callback ) script.onload = callback;
    script.type = 'text/javascript';
    script.src = url;
    document.body.appendChild( script );  
}

function loadMapsAPI() {
    addScript( 'https://maps.googleapis.com/maps/api/js?key=key_goes_here&sensor=false&callback=mapsApiReady' );
}

function mapsApiReady() {
    addScript( 'infobox.js', initialize );
}

window.onload = loadMapsAPI;

Answer 2

I created this script. You can call this and add any callback function, so you have to just include this to your scripts and call

googleMapsLoadAsync(function(){ alert('google maps loaded'); });

script

var googleMapsAsyncLoaded = false;
var googleMapsAsyncCallback = function(){ };

function googleMapsLoadAsync(callback) {

    if (typeof callback !== 'undefined') { googleMapsAsyncCallback=callback; }

    if(!googleMapsAsyncLoaded) {

        $.getScript('https://maps.googleapis.com/maps/api/js?sensor=false&async=2&callback=googleMapsAsyncLoadedFunction');

    } else {

        googleMapsAsyncLoadedFunction();

    }

}

function googleMapsAsyncLoadedFunction() {

    googleMapsAsyncLoaded = true;

    if(googleMapsAsyncCallback && typeof(googleMapsAsyncCallback) === "function") {

        googleMapsAsyncCallback();

    }

    googleMapsAsyncCallback = function(){ };

}