mirror of
https://github.com/niklasvh/html2canvas.git
synced 2023-08-10 21:13:10 +03:00
339 lines
12 KiB
JavaScript
339 lines
12 KiB
JavaScript
/*
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html2canvas @VERSION@ <http://html2canvas.hertzen.com>
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Copyright (c) 2011 Niklas von Hertzen. All rights reserved.
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http://www.twitter.com/niklasvh
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Released under MIT License
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*/
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html2canvas.Preload = function(element, opts){
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var options = {
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proxy: "http://html2canvas.appspot.com/",
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timeout: 0 // no timeout
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},
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images = {
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numLoaded: 0, // also failed are counted here
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numFailed: 0,
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numTotal: 0,
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cleanupDone: false
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},
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pageOrigin = window.location.protocol + window.location.host,
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methods,
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i,
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count = 0,
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doc = element.ownerDocument,
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domImages = doc.images, // TODO probably should limit it to images present in the element only
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imgLen = domImages.length,
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link = doc.createElement("a");
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opts = opts || {};
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options = html2canvas.Util.Extend(opts, options);
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element = element || doc.body;
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function isSameOrigin(url){
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link.href = url;
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return ((link.protocol + link.host) === pageOrigin);
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}
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function start(){
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html2canvas.log("html2canvas: start: images: " + images.numLoaded + " / " + images.numTotal + " (failed: " + images.numFailed + ")");
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if (!images.firstRun && images.numLoaded >= images.numTotal){
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/*
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this.log('Finished loading '+this.imagesLoaded+' images, Started parsing');
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this.bodyOverflow = document.getElementsByTagName('body')[0].style.overflow;
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document.getElementsByTagName('body')[0].style.overflow = "hidden";
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*/
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if (typeof options.complete === "function"){
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options.complete(images);
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}
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html2canvas.log("Finished loading images: # " + images.numTotal + " (failed: " + images.numFailed + ")");
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}
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}
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function proxyGetImage(url, img){
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var callback_name,
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scriptUrl = options.proxy,
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script,
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imgObj = images[url];
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link.href = url;
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url = link.href; // work around for pages with base href="" set - WARNING: this may change the url -> so access imgObj from images map before changing that url!
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callback_name = 'html2canvas_' + count;
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imgObj.callbackname = callback_name;
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if (scriptUrl.indexOf("?") > -1) {
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scriptUrl += "&";
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} else {
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scriptUrl += "?";
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}
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scriptUrl += 'url=' + encodeURIComponent(url) + '&callback=' + callback_name;
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window[callback_name] = function(a){
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if (a.substring(0,6) === "error:"){
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imgObj.succeeded = false;
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images.numLoaded++;
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images.numFailed++;
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start();
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} else {
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img.onload = function(){
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imgObj.succeeded = true;
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images.numLoaded++;
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start();
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};
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img.src = a;
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}
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window[callback_name] = undefined; // to work with IE<9 // NOTE: that the undefined callback property-name still exists on the window object (for IE<9)
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try {
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delete window[callback_name]; // for all browser that support this
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} catch(ex) {}
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script.parentNode.removeChild(script);
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script = null;
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imgObj.callbackname = undefined;
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};
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count += 1;
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script = doc.createElement("script");
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script.setAttribute("src", scriptUrl);
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script.setAttribute("type", "text/javascript");
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imgObj.script = script;
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window.document.body.appendChild(script);
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/*
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// enable xhr2 requests where available (no need for base64 / json)
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$.ajax({
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data:{
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xhr2:false,
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url:url
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},
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url: options.proxy,
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dataType: "jsonp",
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success: function(a){
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if (a.substring(0,6) === "error:"){
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images.splice(getIndex(images, url), 2);
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start();
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}else{
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img.onload = function(){
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imagesLoaded+=1;
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start();
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};
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img.src = a;
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}
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},
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error: function(){
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images.splice(getIndex(images, url), 2);
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start();
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}
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});
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*/
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}
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function getImages (el) {
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// if (!this.ignoreRe.test(el.nodeName)){
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//
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var contents = html2canvas.Util.Children(el),
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i,
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contentsLen = contents.length,
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background_image,
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src,
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img,
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elNodeType = false;
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for (i = 0; i < contentsLen; i+=1 ){
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// var ignRe = new RegExp("("+this.ignoreElements+")");
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// if (!ignRe.test(element.nodeName)){
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getImages(contents[i]);
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// }
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}
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// }
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try {
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elNodeType = el.nodeType;
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} catch (ex) {
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elNodeType = false;
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html2canvas.log("html2canvas: failed to access some element's nodeType - Exception: " + ex.message);
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}
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if (elNodeType === 1 || elNodeType === undefined){
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background_image = html2canvas.Util.getCSS(el, 'backgroundImage');
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if ( background_image && background_image !== "1" && background_image !== "none" ) {
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// TODO add multi image background support
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if (background_image.substring(0,7) === "-webkit" || background_image.substring(0,3) === "-o-" || background_image.substring(0,4) === "-moz") {
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img = html2canvas.Generate.Gradient( background_image, html2canvas.Util.Bounds( el ) );
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if ( img !== undefined ){
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images[background_image] = { img: img, succeeded: true };
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images.numTotal++;
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images.numLoaded++;
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start();
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}
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} else {
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src = html2canvas.Util.backgroundImage(background_image.match(/data:image\/.*;base64,/i) ? background_image : background_image.split(",")[0]);
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methods.loadImage(src);
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}
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/*
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if (background_image && background_image !== "1" && background_image !== "none" && background_image.substring(0,7) !== "-webkit" && background_image.substring(0,3)!== "-o-" && background_image.substring(0,4) !== "-moz"){
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// TODO add multi image background support
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src = html2canvas.Util.backgroundImage(background_image.split(",")[0]);
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methods.loadImage(src); */
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}
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}
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}
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methods = {
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loadImage: function( src ) {
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var img;
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if ( images[src] === undefined ) {
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if ( src.match(/data:image\/.*;base64,/i) ) {
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//Base64 src
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img = new Image();
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img.src = src.replace(/url\(['"]{0,}|['"]{0,}\)$/ig, '');
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images[src] = { img: img, succeeded: true };
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images.numTotal++;
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images.numLoaded++;
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start();
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}else if ( isSameOrigin( src ) ) {
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img = new Image();
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images[src] = { img: img };
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images.numTotal++;
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img.onload = function() {
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images.numLoaded++;
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images[src].succeeded = true;
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start();
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};
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img.onerror = function() {
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images.numLoaded++;
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images.numFailed++;
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images[src].succeeded = false;
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start();
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};
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img.src = src;
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}else if ( options.proxy ){
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// console.log('b'+src);
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img = new Image();
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images[src] = { img: img };
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images.numTotal++;
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proxyGetImage( src, img );
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}
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}
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},
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cleanupDOM: function(cause) {
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var img;
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if (!images.cleanupDone) {
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if (cause && typeof cause === "string") {
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html2canvas.log("html2canvas: Cleanup because: " + cause);
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} else {
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html2canvas.log("html2canvas: Cleanup after timeout: " + options.timeout + " ms.");
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}
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for (src in images) {
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if (images.hasOwnProperty(src)) {
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img = images[src];
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if (typeof img === "object" && img.callbackname && img.succeeded === undefined) {
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// cancel proxy image request
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window[img.callbackname] = undefined; // to work with IE<9 // NOTE: that the undefined callback property-name still exists on the window object (for IE<9)
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try {
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delete window[img.callbackname]; // for all browser that support this
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} catch(ex) {}
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if (img.script && img.script.parentNode) {
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img.script.setAttribute("src", "about:blank"); // try to cancel running request
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img.script.parentNode.removeChild(img.script);
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}
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images.numLoaded++;
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images.numFailed++;
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html2canvas.log("html2canvas: Cleaned up failed img: '" + src + "' Steps: " + images.numLoaded + " / " + images.numTotal);
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}
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}
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}
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// cancel any pending requests
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if(window.stop !== undefined) {
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window.stop();
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} else if(document.execCommand !== undefined) {
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document.execCommand("Stop", false);
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}
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if (document.close !== undefined) {
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document.close();
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}
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images.cleanupDone = true;
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if (!(cause && typeof cause === "string")) {
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start();
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}
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}
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},
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renderingDone: function() {
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if (timeoutTimer) {
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window.clearTimeout(timeoutTimer);
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}
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}
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};
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if (options.timeout > 0) {
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timeoutTimer = window.setTimeout(methods.cleanupDOM, options.timeout);
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}
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var startTime = (new Date()).getTime();
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this.log('html2canvas: Preload starts: finding background-images');
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images.firstRun = true;
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getImages( element );
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this.log('html2canvas: Preload: Finding images');
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// load <img> images
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for (i = 0; i < imgLen; i+=1){
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var imgSrc = domImages[i].getAttribute( "src" );
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if ( imgSrc ) {
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methods.loadImage( imgSrc );
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}
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}
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images.firstRun = false;
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this.log('html2canvas: Preload: Done.');
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if ( images.numTotal === images.numLoaded ) {
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start();
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}
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return methods;
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};
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