Take Webpage Screenshot with HTML5 and JavaScript

Here I come with the one quick tip related to HTML5 and JavaScript. This is about to take webpage screenshot using HTML5 and JavaScript code only. Yes you have read it correct its using HTML5 and JavaScript only. :)

Without wasting much time let’s have a look at code and yes working example for sure.

(function (exports) { function urlsToAbsolute(nodeList) { if (!nodeList.length) { return []; } var attrName = 'href'; if (nodeList[0].__proto__ === HTMLImageElement.prototype || nodeList[0].__proto__ === HTMLScriptElement.prototype) { attrName = 'src'; } nodeList = [].map.call(nodeList, function (el, i) { var attr = el.getAttribute(attrName); if (!attr) { return; } var absURL = /^(https?|data):/i.test(attr); if (absURL) { return el; } else { return el; } }); return nodeList; } function screenshotPage() { urlsToAbsolute(document.images); urlsToAbsolute(document.querySelectorAll("link[rel='stylesheet']")); var screenshot = document.documentElement.cloneNode(true); var b = document.createElement('base'); b.href = document.location.protocol + '//' + location.host; var head = screenshot.querySelector('head'); head.insertBefore(b, head.firstChild); screenshot.style.pointerEvents = 'none'; screenshot.style.overflow = 'hidden'; screenshot.style.webkitUserSelect = 'none'; screenshot.style.mozUserSelect = 'none'; screenshot.style.msUserSelect = 'none'; screenshot.style.oUserSelect = 'none'; screenshot.style.userSelect = 'none'; screenshot.dataset.scrollX = window.scrollX; screenshot.dataset.scrollY = window.scrollY; var script = document.createElement('script'); script.textContent = '(' + addOnPageLoad_.toString() + ')();'; screenshot.querySelector('body').appendChild(script); var blob = new Blob([screenshot.outerHTML], { type: 'text/html' }); return blob; } function addOnPageLoad_() { window.addEventListener('DOMContentLoaded', function (e) { var scrollX = document.documentElement.dataset.scrollX || 0; var scrollY = document.documentElement.dataset.scrollY || 0; window.scrollTo(scrollX, scrollY); }); } function generate() { window.URL = window.URL || window.webkitURL; window.open(window.URL.createObjectURL(screenshotPage())); } exports.screenshotPage = screenshotPage; exports.generate = generate; })(window);
(function (exports) {
    function urlsToAbsolute(nodeList) {
        if (!nodeList.length) {
            return [];
        }
        var attrName = 'href';
        if (nodeList[0].__proto__ === HTMLImageElement.prototype
        || nodeList[0].__proto__ === HTMLScriptElement.prototype) {
            attrName = 'src';
        }
        nodeList = [].map.call(nodeList, function (el, i) {
            var attr = el.getAttribute(attrName);
            if (!attr) {
                return;
            }
            var absURL = /^(https?|data):/i.test(attr);
            if (absURL) {
                return el;
            } else {
                return el;
            }
        });
        return nodeList;
    }

    function screenshotPage() {
        urlsToAbsolute(document.images);
        urlsToAbsolute(document.querySelectorAll("link[rel='stylesheet']"));
        var screenshot = document.documentElement.cloneNode(true);
        var b = document.createElement('base');
        b.href = document.location.protocol + '//' + location.host;
        var head = screenshot.querySelector('head');
        head.insertBefore(b, head.firstChild);
        screenshot.style.pointerEvents = 'none';
        screenshot.style.overflow = 'hidden';
        screenshot.style.webkitUserSelect = 'none';
        screenshot.style.mozUserSelect = 'none';
        screenshot.style.msUserSelect = 'none';
        screenshot.style.oUserSelect = 'none';
        screenshot.style.userSelect = 'none';
        screenshot.dataset.scrollX = window.scrollX;
        screenshot.dataset.scrollY = window.scrollY;
        var script = document.createElement('script');
        script.textContent = '(' + addOnPageLoad_.toString() + ')();';
        screenshot.querySelector('body').appendChild(script);
        var blob = new Blob([screenshot.outerHTML], {
            type: 'text/html'
        });
        return blob;
    }

    function addOnPageLoad_() {
        window.addEventListener('DOMContentLoaded', function (e) {
            var scrollX = document.documentElement.dataset.scrollX || 0;
            var scrollY = document.documentElement.dataset.scrollY || 0;
            window.scrollTo(scrollX, scrollY);
        });
    }

    function generate() {
        window.URL = window.URL || window.webkitURL;
        window.open(window.URL.createObjectURL(screenshotPage()));
    }
    exports.screenshotPage = screenshotPage;
    exports.generate = generate;
})(window);

Demo

I have created a demo page for above code so you can see that in action. Live Example.

I left this article open for discussion, so it would be great if you post your views, comments, suggestion via comment form below.

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Written by Avinash

Avinash Zala is leading various projects which deals with the various technology involved with the web. A combination of perfect technical and management skills. Avinash would like to chat with you and convert your imagination into the working system. You can get in touch with him on Facebook and Twitter.

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