Question

i´ve made a tutorial from google maps api to load markers from database and php with a generated xml file to the map. Now i am trying to add a delay with setTimeout or so to drop one marker after another like this example. I very beginner and would very happy if someone can tell me how to do this!

downloadUrl("php/addLocations.php", function (data) {
    var xml = parseXml(data);
    var markers = xml.documentElement.getElementsByTagName("marker");
    for (var i = 0; i < markers.length; i++) {
        var name = markers[i].getAttribute("name");
        var address = markers[i].getAttribute("address");
        var type = markers[i].getAttribute("type");
        var profile_image = markers[i].getAttribute("myimage");
        var point = new google.maps.LatLng(
        parseFloat(markers[i].getAttribute("lat")), parseFloat(markers[i].getAttribute("lng")));
        var html = "<b>" + name + "</b> <br/>" + address + "<br/>" + "<img src='uploads/" + profile_image + "' width='100px' />";
        var icon = customIcons[type] || {};
        var marker2 = new google.maps.Marker({
            map: bigmap,
            position: point,
            icon: icon.icon,
            animation: google.maps.Animation.DROP,
            shadow: icon.shadow
        });
        bindInfoWindow(marker2, bigmap, infoWindowLoc, html);
    }
});


var infoWindowLoc = new google.maps.InfoWindow;

function bindInfoWindow(marker2, bigmap, infoWindowLoc, html) {
    google.maps.event.addListener(marker2, 'click', function () {
        //openMarkerBox(); 
        // panning map
        bigmap.panTo(marker2.position);
        infoWindowLoc.setContent(html);
        infoWindowLoc.open(bigmap, marker2);
    });
}

function downloadUrl(url, callback) {
    var request = window.ActiveXObject ? new ActiveXObject('Microsoft.XMLHTTP') : new XMLHttpRequest;

    request.onreadystatechange = function () {
        if (request.readyState == 4) {
            request.onreadystatechange = doNothing;
            callback(request.responseText, request.status);
        }
    };

    request.open('GET', url, true);
    request.send(null);
}

function parseXml(str) {
    if (window.ActiveXObject) {
        var doc = new ActiveXObject('Microsoft.XMLDOM');
        doc.loadXML(str);
        return doc;
    } else if (window.DOMParser) {
        return (new DOMParser).parseFromString(str, 'text/xml');
    }
}

function doNothing() {
    alert("shit")
}

Answer 1

Well, if you inspect the code at your example, everything you need is there. Take a look at:

1 – The onclick handler that is attached to the Drop Markers button:

`<button id="drop" onclick="drop()">Drop Markers</button>`

Online documentation for onclick is available: at this link.

2 – The drop() function from your example:

function drop() {
    for (var i = 0; i < neighborhoods.length; i++) {
        setTimeout(function() {
            addMarker();
        }, i * 200);
    }
}

Online documentation for the setTimeout function is available: at this link.

3 – The addMarker() function from your example:

function addMarker() {
    markers.push(new google.maps.Marker({
        position:  neighborhoods[iterator],
        map:       map,
        draggable: false,
        animation: google.maps.Animation.DROP
    }));
    iterator++;
}

Online documentation for google.maps.marker animation is available: at this link.

Walk through the code, dig in a little, and you should be able to figure this out.