Trigger Event after All Images Loaded

Raymond Raymond visibility 929 event 2021-09-18 access_time 2 years ago language English

When implementing Bootstrap 5 Masonry Cards Layout, I added a event handler after each image is loaded to layout the cards using Masonry JavaScript library. The drawback of that approach is that the function will be called as many times as the images count. In a modern environment, we could just use Promise to call the function once after all images are loaded.

Example code


        var $grid = document.querySelector('.row');
        var msnry = new Masonry($grid, {
            itemSelector: '.col',
            percentPosition: true
        var $images = $grid.querySelectorAll('.card img');
        // $images.forEach(function (el) {
        // el.addEventListener('load', function () {
        // console.log("Image is loaded: " + el.getAttribute("src"));
        // msnry.layout();
        // });
        // });
            Array.from($images).filter(img => !img.complete)
                .map(img => new Promise(resolve => { 
                    img.addEventListener('load', resolve); 
                    img.addEventListener('error', resolve);
            () => {
                console.log('images finished loading');

The output looks like the following screenshot:


warning Promise is not supported by all browsers but is supported by majority of modern browsers. 

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info Last modified by Raymond 2 years ago copyright This page is subject to Site terms.
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