Detecting an image 404 in Javascript

From: http://lucassmith.name/2008/11/is-my-image-loaded.html

// First a couple helper functions
function $(id) {
    return !id || id.nodeType === 1 ? id : document.getElementById(id);
}
function isType(o,t) {    return (typeof o).indexOf(t.charAt(0).toLowerCase()) === 0;}

// Here's the meat and potatoes
function image(src,cfg) {    var img, prop, target;
    cfg = cfg || (isType(src,'o') ? src : {});

    img = $(src);
    if (img) {
        src = cfg.src || img.src;
    } else {
        img = document.createElement('img');
        src = src || cfg.src;
    }

    if (!src) {
        return null;
    }

    prop = isType(img.naturalWidth,'u') ? 'width' : 'naturalWidth';
    img.alt = cfg.alt || img.alt;

    // Add the image and insert if requested (must be on DOM to load or
    // pull from cache)
    img.src = src;

    target = $(cfg.target);
    if (target) {
        target.insertBefore(img, $(cfg.insertBefore) || null);
    }

    // Loaded?
    if (img.complete) {
        if (img[prop]) {
            if (isType(cfg.success,'f')) {
                cfg.success.call(img);
            }
        } else {
            if (isType(cfg.failure,'f')) {
                cfg.failure.call(img);
            }
        }
    } else {
        if (isType(cfg.success,'f')) {
            img.onload = cfg.success;
        }
        if (isType(cfg.failure,'f')) {
            img.onerror = cfg.failure;
        }
    }

    return img;
}

And here how to use it:

image('imgId',{
    success : function () { alert(this.width); },
    failure : function () { alert('Damn your eyes!'); },
});

image('http://somedomain.com/image/typooed_url.jpg', {
    success : function () {...},
    failure : function () {...},
    target : 'myContainerId',
    insertBefore : 'someChildOfmyContainerId'
});

First option:

<img src="picture1.gif" onerror="this.onerror=null;this.src='missing.gif';"/>

Second option:

<html>
<head>
<script type="text/javascript">
    function ImgError(source){
        source.src = "/noimage.gif";
        source.onerror = "";
        return true;
    }
</script>
</head>
<body>
    <img src="image_example1.jpg" onerror="ImgError(this)" />
</body>
</html>

PS: it's pure javascript! you don't need any libraries. (Vanilla JS)

Example in Fidler

https://jsfiddle.net/dorathoto/8z4Ltzp8/71/


Handle the <img> element's onerror event.

Tags:

Javascript

Jquery

Cross Browser

Dom Events

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