how to make sure images load sequentially

Question

Here i have a simple test code which loads a test of images in browser.Here i used asynchronous onload event to add image to dom after it finishes loading. Images load just fine

Answer 1

You should wait for the callback from the onload event. If it's fired you can iterate and load the next image. This makes sure the images will be loaded in the right order (as in array).

var images = [
    'http://d39kbiy71leyho.cloudfront.net/wp-content/uploads/2016/05/09170020/cats-politics-TN.jpg',
    'error',
    'https://s2.graphiq.com/sites/default/files/stories/t2/tiny_cat_12573_8950.jpg',
    'http://www.bharatint.com/img/categories/our-cat-shop-image.png'
], i = 0;

function loadImageArrayAsync(){
    var image = new Image();
    image.onload = function(){
        document.body.appendChild(image);
        if (i++ < images.length - 1) loadImageArrayAsync();
    };
    image.onerror = function(){
        if (i++ < images.length - 1) loadImageArrayAsync();
     }
    image.src = images[i];
    image.style.height = '300px';
    image.style.width = '300px';
}

loadImageArrayAsync();