diff --git a/build/html2canvas.js b/build/html2canvas.js index 3a44bc3..99e2a5f 100644 --- a/build/html2canvas.js +++ b/build/html2canvas.js @@ -1029,7 +1029,7 @@ function h2cRenderContext(width, height) { } }; } -_html2canvas.Parse = function (images, options) { +_html2canvas.Parse = function (images, options, cb) { window.scroll(0,0); var element = (( options.elements === undefined ) ? document.body : options.elements[0]), // select body by default @@ -1041,15 +1041,163 @@ _html2canvas.Parse = function (images, options) { body = doc.body, getCSS = Util.getCSS, pseudoHide = "___html2canvas___pseudoelement", - hidePseudoElements = doc.createElement('style'); + hidePseudoElementsStyles = doc.createElement('style'); - hidePseudoElements.innerHTML = '.' + pseudoHide + '-before:before { content: "" !important; display: none !important; }' + - '.' + pseudoHide + '-after:after { content: "" !important; display: none !important; }'; + hidePseudoElementsStyles.innerHTML = '.' + pseudoHide + + '-parent:before { content: "" !important; display: none !important; }' + + '.' + pseudoHide + '-parent:after { content: "" !important; display: none !important; }'; - body.appendChild(hidePseudoElements); + body.appendChild(hidePseudoElementsStyles); images = images || {}; + init(); + + function init() { + var background = getCSS(document.documentElement, "backgroundColor"), + transparentBackground = (Util.isTransparent(background) && element === document.body), + stack = renderElement(element, null, false, transparentBackground); + + // create pseudo elements in a single pass to prevent synchronous layouts + addPseudoElements(element); + + parseChildren(element, stack, function() { + if (transparentBackground) { + background = stack.backgroundColor; + } + + removePseudoElements(); + + Util.log('Done parsing, moving to Render.'); + + cb({ + backgroundColor: background, + stack: stack + }); + }); + } + + // Given a root element, find all pseudo elements below, create elements mocking pseudo element styles + // so we can process them as normal elements, and hide the original pseudo elements so they don't interfere + // with layout. + function addPseudoElements(el) { + // These are done in discrete steps to prevent a relayout loop caused by addClass() invalidating + // layouts & getPseudoElement calling getComputedStyle. + var jobs = [], classes = []; + getPseudoElementClasses(); + findPseudoElements(el); + runJobs(); + + function getPseudoElementClasses(){ + var findPsuedoEls = /:before|:after/; + var sheets = document.styleSheets; + for (var i = 0, j = sheets.length; i < j; i++) { + try { + var rules = sheets[i].cssRules; + for (var k = 0, l = rules.length; k < l; k++) { + if(findPsuedoEls.test(rules[k].selectorText)) { + classes.push(rules[k].selectorText); + } + } + } + catch(e) { // will throw security exception for style sheets loaded from external domains + } + } + + // Trim off the :after and :before (or ::after and ::before) + for (i = 0, j = classes.length; i < j; i++) { + classes[i] = classes[i].match(/(^[^:]*)/)[1]; + } + } + + // Using the list of elements we know how pseudo el styles, create fake pseudo elements. + function findPseudoElements(el) { + var els = document.querySelectorAll(classes.join(',')); + for(var i = 0, j = els.length; i < j; i++) { + createPseudoElements(els[i]); + } + } + + // Create pseudo elements & add them to a job queue. + function createPseudoElements(el) { + var before = getPseudoElement(el, ':before'), + after = getPseudoElement(el, ':after'); + + if(before) { + jobs.push({type: 'before', pseudo: before, el: el}); + } + + if (after) { + jobs.push({type: 'after', pseudo: after, el: el}); + } + } + + // Adds a class to the pseudo's parent to prevent the original before/after from messing + // with layouts. + // Execute the inserts & addClass() calls in a batch to prevent relayouts. + function runJobs() { + // Add Class + jobs.forEach(function(job){ + addClass(job.el, pseudoHide + "-parent"); + }); + + // Insert el + jobs.forEach(function(job){ + if(job.type === 'before'){ + job.el.insertBefore(job.pseudo, job.el.firstChild); + } else { + job.el.appendChild(job.pseudo); + } + }); + } + } + + + + // Delete our fake pseudo elements from the DOM. This will remove those actual elements + // and the classes on their parents that hide the actual pseudo elements. + // Note that NodeLists are 'live' collections so you can't use a for loop here. They are + // actually deleted from the NodeList after each iteration. + function removePseudoElements(){ + // delete pseudo elements + body.removeChild(hidePseudoElementsStyles); + var pseudos = document.getElementsByClassName(pseudoHide + "-element"); + while (pseudos.length) { + pseudos[0].parentNode.removeChild(pseudos[0]); + } + + // Remove pseudo hiding classes + var parents = document.getElementsByClassName(pseudoHide + "-parent"); + while(parents.length) { + removeClass(parents[0], pseudoHide + "-parent"); + } + } + + function addClass (el, className) { + if (el.classList) { + el.classList.add(className); + } else { + el.className = el.className + " " + className; + } + } + + function removeClass (el, className) { + if (el.classList) { + el.classList.remove(className); + } else { + el.className = el.className.replace(className, "").trim(); + } + } + + function hasClass (el, className) { + return el.className.indexOf(className) > -1; + } + + // Note that this doesn't work in < IE8, but we don't support that anyhow + function nodeListToArray (nodeList) { + return Array.prototype.slice.call(nodeList); + } + function documentWidth () { return Math.max( Math.max(doc.body.scrollWidth, doc.documentElement.scrollWidth), @@ -1367,6 +1515,13 @@ _html2canvas.Parse = function (images, options) { } } + function h2czContext(zindex) { + return { + zindex: zindex, + children: [] + }; + } + function renderImage(ctx, element, image, bounds, borders) { var paddingLeft = getCSSInt(element, 'paddingLeft'), @@ -1403,69 +1558,67 @@ _html2canvas.Parse = function (images, options) { }); } - var getCurvePoints = (function(kappa) { - - return function(x, y, r1, r2) { - var ox = (r1) * kappa, // control point offset horizontal - oy = (r2) * kappa, // control point offset vertical - xm = x + r1, // x-middle - ym = y + r2; // y-middle - return { - topLeft: bezierCurve({ - x:x, - y:ym - }, { - x:x, - y:ym - oy - }, { - x:xm - ox, - y:y - }, { - x:xm, - y:y - }), - topRight: bezierCurve({ - x:x, - y:y - }, { - x:x + ox, - y:y - }, { - x:xm, - y:ym - oy - }, { - x:xm, - y:ym - }), - bottomRight: bezierCurve({ - x:xm, - y:y - }, { - x:xm, - y:y + oy - }, { - x:x + ox, - y:ym - }, { - x:x, - y:ym - }), - bottomLeft: bezierCurve({ - x:xm, - y:ym - }, { - x:xm - ox, - y:ym - }, { - x:x, - y:y + oy - }, { - x:x, - y:y - }) - }; + function getCurvePoints(x, y, r1, r2) { + var kappa = 4 * ((Math.sqrt(2) - 1) / 3); + var ox = (r1) * kappa, // control point offset horizontal + oy = (r2) * kappa, // control point offset vertical + xm = x + r1, // x-middle + ym = y + r2; // y-middle + return { + topLeft: bezierCurve({ + x:x, + y:ym + }, { + x:x, + y:ym - oy + }, { + x:xm - ox, + y:y + }, { + x:xm, + y:y + }), + topRight: bezierCurve({ + x:x, + y:y + }, { + x:x + ox, + y:y + }, { + x:xm, + y:ym - oy + }, { + x:xm, + y:ym + }), + bottomRight: bezierCurve({ + x:xm, + y:y + }, { + x:xm, + y:y + oy + }, { + x:x + ox, + y:ym + }, { + x:x, + y:ym + }), + bottomLeft: bezierCurve({ + x:xm, + y:ym + }, { + x:xm - ox, + y:ym + }, { + x:x, + y:y + oy + }, { + x:x, + y:y + }) }; - })(4 * ((Math.sqrt(2) - 1) / 3)); + } function bezierCurve(start, startControl, endControl, end) { @@ -1804,20 +1957,25 @@ _html2canvas.Parse = function (images, options) { function getPseudoElement(el, which) { var elStyle = window.getComputedStyle(el, which); - if(!elStyle || !elStyle.content || elStyle.content === "none" || elStyle.content === "-moz-alt-content" || elStyle.display === "none") { + var parentStyle = window.getComputedStyle(el); + // If no content attribute is present, the pseudo element is hidden, + // or the parent has a content property equal to the content on the pseudo element, + // move along. + if(!elStyle || !elStyle.content || elStyle.content === "none" || elStyle.content === "-moz-alt-content" || + elStyle.display === "none" || parentStyle.content === elStyle.content) { return; } - var content = elStyle.content + '', - first = content.substr( 0, 1 ); - //strips quotes - if(first === content.substr( content.length - 1 ) && first.match(/'|"/)) { - content = content.substr( 1, content.length - 2 ); + var content = elStyle.content + ''; + + // Strip inner quotes + if(content[0] === "'" || content[0] === "\"") { + content = content.replace(/(^['"])|(['"]$)/g, ''); } var isImage = content.substr( 0, 3 ) === 'url', elps = document.createElement( isImage ? 'img' : 'span' ); - elps.className = pseudoHide + "-before " + pseudoHide + "-after"; + elps.className = pseudoHide + "-element "; Object.keys(elStyle).filter(indexedProperty).forEach(function(prop) { // Prevent assigning of read only CSS Rules, ex. length, parentRule @@ -1840,31 +1998,6 @@ _html2canvas.Parse = function (images, options) { return (isNaN(window.parseInt(property, 10))); } - function injectPseudoElements(el, stack) { - var before = getPseudoElement(el, ':before'), - after = getPseudoElement(el, ':after'); - if(!before && !after) { - return; - } - - if(before) { - el.className += " " + pseudoHide + "-before"; - el.parentNode.insertBefore(before, el); - parseElement(before, stack, true); - el.parentNode.removeChild(before); - el.className = el.className.replace(pseudoHide + "-before", "").trim(); - } - - if (after) { - el.className += " " + pseudoHide + "-after"; - el.appendChild(after); - parseElement(after, stack, true); - el.removeChild(after); - el.className = el.className.replace(pseudoHide + "-after", "").trim(); - } - - } - function renderBackgroundRepeat(ctx, image, backgroundPosition, bounds) { var offsetX = Math.round(bounds.left + backgroundPosition.left), offsetY = Math.round(bounds.top + backgroundPosition.top); @@ -1984,9 +2117,8 @@ _html2canvas.Parse = function (images, options) { return str.replace("px", ""); } - var transformRegExp = /(matrix)\((.+)\)/; - function getTransform(element, parentStack) { + var transformRegExp = /(matrix)\((.+)\)/; var transform = getCSS(element, "transform") || getCSS(element, "-webkit-transform") || getCSS(element, "-moz-transform") || getCSS(element, "-ms-transform") || getCSS(element, "-o-transform"); var transformOrigin = getCSS(element, "transform-origin") || getCSS(element, "-webkit-transform-origin") || getCSS(element, "-moz-transform-origin") || getCSS(element, "-ms-transform-origin") || getCSS(element, "-o-transform-origin") || "0px 0px"; @@ -2053,7 +2185,7 @@ _html2canvas.Parse = function (images, options) { return bounds; } - function renderElement(element, parentStack, pseudoElement, ignoreBackground) { + function renderElement(element, parentStack, ignoreBackground) { var transform = getTransform(element, parentStack), bounds = getBounds(element, transform), image, @@ -2083,10 +2215,6 @@ _html2canvas.Parse = function (images, options) { renderBorders(ctx, border.args, border.color); }); - if (!pseudoElement) { - injectPseudoElements(element, stack); - } - switch(element.nodeName){ case "IMG": if ((image = loadImage(element.getAttribute('src')))) { @@ -2127,52 +2255,54 @@ _html2canvas.Parse = function (images, options) { return (getCSS(element, 'display') !== "none" && getCSS(element, 'visibility') !== "hidden" && !element.hasAttribute("data-html2canvas-ignore")); } - function parseElement (element, stack, pseudoElement) { + function parseElement (element, stack, cb) { + if (!cb) { + cb = function(){}; + } if (isElementVisible(element)) { - stack = renderElement(element, stack, pseudoElement, false) || stack; + stack = renderElement(element, stack, false) || stack; if (!ignoreElementsRegExp.test(element.nodeName)) { - parseChildren(element, stack, pseudoElement); + return parseChildren(element, stack, cb); } } + cb(); } - function parseChildren(element, stack, pseudoElement) { - Util.Children(element).forEach(function(node) { + function parseChildren(element, stack, cb) { + var children = Util.Children(element); + // After all nodes have processed, finished() will call the cb. + // We add one and kick it off so this will still work when children.length === 0. + // Note that unless async is true, this will happen synchronously, just will callbacks. + var jobs = children.length + 1; + finished(); + + if (options.async) { + children.forEach(function(node) { + // Don't block the page from rendering + setTimeout(function(){ parseNode(node); }, 0); + }); + } else { + children.forEach(parseNode); + } + + function parseNode(node) { if (node.nodeType === node.ELEMENT_NODE) { - parseElement(node, stack, pseudoElement); + parseElement(node, stack, finished); } else if (node.nodeType === node.TEXT_NODE) { renderText(element, node, stack); + finished(); + } else { + finished(); + } + } + function finished(el) { + if (--jobs <= 0){ + Util.log("finished rendering " + children.length + " children."); + cb(); } - }); - } - - function init() { - var background = getCSS(document.documentElement, "backgroundColor"), - transparentBackground = (Util.isTransparent(background) && element === document.body), - stack = renderElement(element, null, false, transparentBackground); - parseChildren(element, stack); - - if (transparentBackground) { - background = stack.backgroundColor; } - - body.removeChild(hidePseudoElements); - return { - backgroundColor: background, - stack: stack - }; } - - return init(); }; - -function h2czContext(zindex) { - return { - zindex: zindex, - children: [] - }; -} - _html2canvas.Preload = function( options ) { var images = { @@ -2678,9 +2808,9 @@ window.html2canvas = function(elements, opts) { useOverflow: true, letterRendering: false, chinese: false, + async: false, // If true, parsing will not block, but if the user scrolls during parse the image can get weird // render options - width: null, height: null, taintTest: true, // do a taint test with all images before applying to canvas @@ -2697,21 +2827,19 @@ window.html2canvas = function(elements, opts) { return; } } - queue = _html2canvas.Parse( images, options ); - - if (typeof options.onparsed === "function") { - if ( options.onparsed( queue ) === false ) { - return; + _html2canvas.Parse( images, options, function(queue) { + if (typeof options.onparsed === "function") { + if ( options.onparsed( queue ) === false ) { + return; + } } - } - - canvas = _html2canvas.Renderer( queue, options ); - - if (typeof options.onrendered === "function") { - options.onrendered( canvas ); - } + canvas = _html2canvas.Renderer( queue, options ); + if (typeof options.onrendered === "function") { + options.onrendered( canvas ); + } + }); }; // for pages without images, we still want this to be async, i.e. return methods before executing diff --git a/build/html2canvas.min.js b/build/html2canvas.min.js index 2ea032d..ccbaa18 100644 --- a/build/html2canvas.min.js +++ b/build/html2canvas.min.js @@ -4,5 +4,5 @@ Released under MIT License */ -(function(t,e,n){"use strict";function r(t,e,n){var r,a=t.runtimeStyle&&t.runtimeStyle[e],o=t.style;return!/^-?[0-9]+\.?[0-9]*(?:px)?$/i.test(n)&&/^-?\d/.test(n)&&(r=o.left,a&&(t.runtimeStyle.left=t.currentStyle.left),o.left="fontSize"===e?"1em":n||0,n=o.pixelLeft+"px",o.left=r,a&&(t.runtimeStyle.left=a)),/^(thin|medium|thick)$/i.test(n)?n:Math.round(parseFloat(n))+"px"}function a(t){return parseInt(t,10)}function o(t,e,a,o){if(t=(t||"").split(","),t=t[o||0]||t[0]||"auto",t=u.Util.trimText(t).split(" 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exception: "+r.message),e=[]}return e},u.Util.isTransparent=function(t){return"transparent"===t||"rgba(0, 0, 0, 0)"===t},u.Util.Font=function(){var t={};return function(e,r,a){if(t[e+"-"+r]!==n)return t[e+"-"+r];var o,i,l,s=a.createElement("div"),c=a.createElement("img"),d=a.createElement("span"),u="Hidden Text";return 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b=a.offsetParent?k.Util.OffsetBounds(a.offsetParent):{top:0,left:0};return{top:a.offsetTop+b.top,bottom:a.offsetTop+a.offsetHeight+b.top,left:a.offsetLeft+b.left,width:a.offsetWidth,height:a.offsetHeight}},k.Util.getCSS=function(a,c,d){i!==a&&(j=b.defaultView.getComputedStyle(a,null));var g=j[c];if(/^background(Size|Position)$/.test(c))return f(g,a,c,d);if(/border(Top|Bottom)(Left|Right)Radius/.test(c)){var h=g.split(" ");return h.length<=1&&(h[1]=h[0]),h.map(e)}return g},k.Util.resizeBounds=function(a,b,c,d,e){var f,g,h=c/d,i=a/b;return e&&"auto"!==e?i>h^"contain"===e?(g=d,f=d*i):(f=c,g=c/i):(f=c,g=d),{width:f,height:g}},k.Util.BackgroundPosition=function(a,b,c,d,e){var f=g("backgroundPosition",a,b,c,d,e);return{left:f[0],top:f[1]}},k.Util.BackgroundSize=function(a,b,c,d){var e=g("backgroundSize",a,b,c,d);return{width:e[0],height:e[1]}},k.Util.Extend=function(a,b){for(var c in a)a.hasOwnProperty(c)&&(b[c]=a[c]);return b},k.Util.Children=function(a){var 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d=k.Generate.Gradient(a,b);d!==c&&(t[a]={img:d,succeeded:!0},t.numTotal++,t.numLoaded++,f())}function l(a){return a&&a.method&&a.args&&a.args.length>0}function m(a,b){var d;k.Util.parseBackgroundImage(a).filter(l).forEach(function(a){"url"===a.method?q.loadImage(a.args[0]):a.method.match(/\-?gradient$/)&&(d===c&&(d=k.Util.Bounds(b)),j(a.value,d))})}function n(a){var b=!1;try{u.Children(a).forEach(n)}catch(d){}try{b=a.nodeType}catch(e){b=!1,u.log("html2canvas: failed to access some element's nodeType - Exception: "+e.message)}if(1===b||b===c){i(a);try{m(u.getCSS(a,"backgroundImage"),a)}catch(d){u.log("html2canvas: failed to get background-image - Exception: "+d.message)}m(a)}}function o(b,e){b.onload=function(){e.timer!==c&&a.clearTimeout(e.timer),t.numLoaded++,e.succeeded=!0,b.onerror=b.onload=null,f()},b.onerror=function(){if("anonymous"===b.crossOrigin&&(a.clearTimeout(e.timer),d.proxy)){var c=b.src;return b=new Image,e.img=b,b.src=c,g(b.src,b,e),void 0}t.numLoaded++,t.numFailed++,e.succeeded=!1,b.onerror=b.onload=null,f()}}var p,q,r,s,t={numLoaded:0,numFailed:0,numTotal:0,cleanupDone:!1},u=k.Util,v=0,w=d.elements[0]||b.body,x=w.ownerDocument,y=w.getElementsByTagName("img"),z=y.length,A=x.createElement("a"),B=function(a){return a.crossOrigin!==c}(new Image);for(A.href=a.location.href,p=A.protocol+A.host,q={loadImage:function(a){var b,f;a&&t[a]===c&&(b=new Image,a.match(/data:image\/.*;base64,/i)?(b.src=a.replace(/url\(['"]{0,}|['"]{0,}\)$/gi,""),f=t[a]={img:b},t.numTotal++,o(b,f)):e(a)||d.allowTaint===!0?(f=t[a]={img:b},t.numTotal++,o(b,f),b.src=a):B&&!d.allowTaint&&d.useCORS?(b.crossOrigin="anonymous",f=t[a]={img:b},t.numTotal++,o(b,f),b.src=a):d.proxy&&(f=t[a]={img:b},t.numTotal++,g(a,b,f)))},cleanupDOM:function(e){var g,h;if(!t.cleanupDone){e&&"string"==typeof e?u.log("html2canvas: Cleanup because: "+e):u.log("html2canvas: Cleanup after timeout: "+d.timeout+" ms.");for(h in t)if(t.hasOwnProperty(h)&&(g=t[h],"object"==typeof g&&g.callbackname&&g.succeeded===c)){a[g.callbackname]=c; +try{delete a[g.callbackname]}catch(i){}g.script&&g.script.parentNode&&(g.script.setAttribute("src","about:blank"),g.script.parentNode.removeChild(g.script)),t.numLoaded++,t.numFailed++,u.log("html2canvas: Cleaned up failed img: '"+h+"' Steps: "+t.numLoaded+" / "+t.numTotal)}a.stop!==c?a.stop():b.execCommand!==c&&b.execCommand("Stop",!1),b.close!==c&&b.close(),t.cleanupDone=!0,e&&"string"==typeof e||f()}},renderingDone:function(){s&&a.clearTimeout(s)}},d.timeout>0&&(s=a.setTimeout(q.cleanupDOM,d.timeout)),u.log("html2canvas: Preload starts: finding background-images"),t.firstRun=!0,n(w),u.log("html2canvas: Preload: Finding images"),r=0;z>r;r+=1)q.loadImage(y[r].getAttribute("src"));return t.firstRun=!1,u.log("html2canvas: Preload: Done."),t.numTotal===t.numLoaded&&f(),q},k.Renderer=function(a,d){function e(a){function b(a){Object.keys(a).sort().forEach(function(c){var d=[],f=[],g=[],h=[];a[c].forEach(function(a){a.node.zIndex.isPositioned||a.node.zIndex.opacity<1?g.push(a):a.node.zIndex.isFloated?f.push(a):d.push(a)}),function i(a){a.forEach(function(a){h.push(a),a.children&&i(a.children)})}(d.concat(f,g)),h.forEach(function(a){a.context?b(a.context):e.push(a.node)})})}var d,e=[];return d=function(a){function b(a,d,e){var f="auto"===d.zIndex.zindex?0:Number(d.zIndex.zindex),g=a,h=d.zIndex.isPositioned,i=d.zIndex.isFloated,j={node:d},k=e;d.zIndex.ownStacking?(g=j.context={"!":[{node:d,children:[]}]},k=c):(h||i)&&(k=j.children=[]),0===f&&e?e.push(j):(a[f]||(a[f]=[]),a[f].push(j)),d.zIndex.children.forEach(function(a){b(g,a,k)})}var d={};return b(d,a),d}(a),b(d),e}function f(a){var b;if("string"==typeof d.renderer&&k.Renderer[a]!==c)b=k.Renderer[a](d);else{if("function"!=typeof a)throw new Error("Unknown renderer");b=a(d)}if("function"!=typeof b)throw new Error("Invalid renderer defined");return b}return f(d.renderer)(a,d,b,e(a.stack),k)},k.Util.Support=function(a,b){function d(){var a=new Image,d=b.createElement("canvas"),e=d.getContext===c?!1:d.getContext("2d");if(e===!1)return!1;d.width=d.height=10,a.src=["data:image/svg+xml,","","","
","sup","
","",""].join("");try{e.drawImage(a,0,0),d.toDataURL()}catch(f){return!1}return k.Util.log("html2canvas: Parse: SVG powered rendering available"),!0}function e(){var a,c,d,e,f=!1;return b.createRange&&(a=b.createRange(),a.getBoundingClientRect&&(c=b.createElement("boundtest"),c.style.height="123px",c.style.display="block",b.body.appendChild(c),a.selectNode(c),d=a.getBoundingClientRect(),e=d.height,123===e&&(f=!0),b.body.removeChild(c))),f}return{rangeBounds:e(),svgRendering:a.svgRendering&&d()}},a.html2canvas=function(b,c){b=b.length?b:[b];var d,e={logging:!1,elements:b,background:"#fff",proxy:null,timeout:0,useCORS:!1,allowTaint:!1,svgRendering:!1,ignoreElements:"IFRAME|OBJECT|PARAM",useOverflow:!0,letterRendering:!1,chinese:!1,async:!1,width:null,height:null,taintTest:!0,renderer:"Canvas"};return e=k.Util.Extend(c,e),k.logging=e.logging,e.complete=function(a){("function"!=typeof e.onpreloaded||e.onpreloaded(a)!==!1)&&k.Parse(a,e,function(a){("function"!=typeof e.onparsed||e.onparsed(a)!==!1)&&(d=k.Renderer(a,e),"function"==typeof e.onrendered&&e.onrendered(d))})},a.setTimeout(function(){k.Preload(e)},0),{render:function(a,b){return k.Renderer(a,k.Util.Extend(b,e))},parse:function(a,b){return k.Parse(a,k.Util.Extend(b,e))},preload:function(a){return k.Preload(k.Util.Extend(a,e))},log:k.Util.log}},a.html2canvas.log=k.Util.log,a.html2canvas.Renderer={Canvas:c},k.Renderer.Canvas=function(a){function d(a,b){a.beginPath(),b.forEach(function(b){a[b.name].apply(a,b.arguments)}),a.closePath()}function e(a){if(-1===h.indexOf(a.arguments[0].src)){j.drawImage(a.arguments[0],0,0);try{j.getImageData(0,0,1,1)}catch(b){return i=g.createElement("canvas"),j=i.getContext("2d"),!1}h.push(a.arguments[0].src)}return!0}function f(b,c){switch(c.type){case"variable":b[c.name]=c.arguments;break;case"function":switch(c.name){case"createPattern":if(c.arguments[0].width>0&&c.arguments[0].height>0)try{b.fillStyle=b.createPattern(c.arguments[0],"repeat")}catch(f){l.log("html2canvas: Renderer: Error creating pattern",f.message)}break;case"drawShape":d(b,c.arguments);break;case"drawImage":c.arguments[8]>0&&c.arguments[7]>0&&(!a.taintTest||a.taintTest&&e(c))&&b.drawImage.apply(b,c.arguments);break;default:b[c.name].apply(b,c.arguments)}}}a=a||{};var g=b,h=[],i=b.createElement("canvas"),j=i.getContext("2d"),l=k.Util,m=a.canvas||g.createElement("canvas");return function(a,b,d,e,g){var h,i,j,k=m.getContext("2d"),n=a.stack;return m.width=m.style.width=b.width||n.ctx.width,m.height=m.style.height=b.height||n.ctx.height,j=k.fillStyle,k.fillStyle=l.isTransparent(n.backgroundColor)&&b.background!==c?b.background:a.backgroundColor,k.fillRect(0,0,m.width,m.height),k.fillStyle=j,e.forEach(function(a){k.textBaseline="bottom",k.save(),a.transform.matrix&&(k.translate(a.transform.origin[0],a.transform.origin[1]),k.transform.apply(k,a.transform.matrix),k.translate(-a.transform.origin[0],-a.transform.origin[1])),a.clip&&(k.beginPath(),k.rect(a.clip.left,a.clip.top,a.clip.width,a.clip.height),k.clip()),a.ctx.storage&&a.ctx.storage.forEach(function(a){f(k,a)}),k.restore()}),l.log("html2canvas: Renderer: Canvas renderer done - returning canvas obj"),1===b.elements.length&&"object"==typeof b.elements[0]&&"BODY"!==b.elements[0].nodeName?(i=g.Util.Bounds(b.elements[0]),h=d.createElement("canvas"),h.width=Math.ceil(i.width),h.height=Math.ceil(i.height),k=h.getContext("2d"),k.drawImage(m,i.left,i.top,i.width,i.height,0,0,i.width,i.height),m=null,h):m}}}(window,document); \ No newline at end of file diff --git a/src/Parse.js b/src/Parse.js index d155789..26064a2 100644 --- a/src/Parse.js +++ b/src/Parse.js @@ -1,4 +1,4 @@ -_html2canvas.Parse = function (images, options) { +_html2canvas.Parse = function (images, options, cb) { window.scroll(0,0); var element = (( options.elements === undefined ) ? document.body : options.elements[0]), // select body by default @@ -10,15 +10,163 @@ _html2canvas.Parse = function (images, options) { body = doc.body, getCSS = Util.getCSS, pseudoHide = "___html2canvas___pseudoelement", - hidePseudoElements = doc.createElement('style'); + hidePseudoElementsStyles = doc.createElement('style'); - hidePseudoElements.innerHTML = '.' + pseudoHide + '-before:before { content: "" !important; display: none !important; }' + - '.' + pseudoHide + '-after:after { content: "" !important; display: none !important; }'; + hidePseudoElementsStyles.innerHTML = '.' + pseudoHide + + '-parent:before { content: "" !important; display: none !important; }' + + '.' + pseudoHide + '-parent:after { content: "" !important; display: none !important; }'; - body.appendChild(hidePseudoElements); + body.appendChild(hidePseudoElementsStyles); images = images || {}; + init(); + + function init() { + var background = getCSS(document.documentElement, "backgroundColor"), + transparentBackground = (Util.isTransparent(background) && element === document.body), + stack = renderElement(element, null, false, transparentBackground); + + // create pseudo elements in a single pass to prevent synchronous layouts + addPseudoElements(element); + + parseChildren(element, stack, function() { + if (transparentBackground) { + background = stack.backgroundColor; + } + + removePseudoElements(); + + Util.log('Done parsing, moving to Render.'); + + cb({ + backgroundColor: background, + stack: stack + }); + }); + } + + // Given a root element, find all pseudo elements below, create elements mocking pseudo element styles + // so we can process them as normal elements, and hide the original pseudo elements so they don't interfere + // with layout. + function addPseudoElements(el) { + // These are done in discrete steps to prevent a relayout loop caused by addClass() invalidating + // layouts & getPseudoElement calling getComputedStyle. + var jobs = [], classes = []; + getPseudoElementClasses(); + findPseudoElements(el); + runJobs(); + + function getPseudoElementClasses(){ + var findPsuedoEls = /:before|:after/; + var sheets = document.styleSheets; + for (var i = 0, j = sheets.length; i < j; i++) { + try { + var rules = sheets[i].cssRules; + for (var k = 0, l = rules.length; k < l; k++) { + if(findPsuedoEls.test(rules[k].selectorText)) { + classes.push(rules[k].selectorText); + } + } + } + catch(e) { // will throw security exception for style sheets loaded from external domains + } + } + + // Trim off the :after and :before (or ::after and ::before) + for (i = 0, j = classes.length; i < j; i++) { + classes[i] = classes[i].match(/(^[^:]*)/)[1]; + } + } + + // Using the list of elements we know how pseudo el styles, create fake pseudo elements. + function findPseudoElements(el) { + var els = document.querySelectorAll(classes.join(',')); + for(var i = 0, j = els.length; i < j; i++) { + createPseudoElements(els[i]); + } + } + + // Create pseudo elements & add them to a job queue. + function createPseudoElements(el) { + var before = getPseudoElement(el, ':before'), + after = getPseudoElement(el, ':after'); + + if(before) { + jobs.push({type: 'before', pseudo: before, el: el}); + } + + if (after) { + jobs.push({type: 'after', pseudo: after, el: el}); + } + } + + // Adds a class to the pseudo's parent to prevent the original before/after from messing + // with layouts. + // Execute the inserts & addClass() calls in a batch to prevent relayouts. + function runJobs() { + // Add Class + jobs.forEach(function(job){ + addClass(job.el, pseudoHide + "-parent"); + }); + + // Insert el + jobs.forEach(function(job){ + if(job.type === 'before'){ + job.el.insertBefore(job.pseudo, job.el.firstChild); + } else { + job.el.appendChild(job.pseudo); + } + }); + } + } + + + + // Delete our fake pseudo elements from the DOM. This will remove those actual elements + // and the classes on their parents that hide the actual pseudo elements. + // Note that NodeLists are 'live' collections so you can't use a for loop here. They are + // actually deleted from the NodeList after each iteration. + function removePseudoElements(){ + // delete pseudo elements + body.removeChild(hidePseudoElementsStyles); + var pseudos = document.getElementsByClassName(pseudoHide + "-element"); + while (pseudos.length) { + pseudos[0].parentNode.removeChild(pseudos[0]); + } + + // Remove pseudo hiding classes + var parents = document.getElementsByClassName(pseudoHide + "-parent"); + while(parents.length) { + removeClass(parents[0], pseudoHide + "-parent"); + } + } + + function addClass (el, className) { + if (el.classList) { + el.classList.add(className); + } else { + el.className = el.className + " " + className; + } + } + + function removeClass (el, className) { + if (el.classList) { + el.classList.remove(className); + } else { + el.className = el.className.replace(className, "").trim(); + } + } + + function hasClass (el, className) { + return el.className.indexOf(className) > -1; + } + + // Note that this doesn't work in < IE8, but we don't support that anyhow + function nodeListToArray (nodeList) { + return Array.prototype.slice.call(nodeList); + } + function documentWidth () { return Math.max( Math.max(doc.body.scrollWidth, doc.documentElement.scrollWidth), @@ -336,6 +484,13 @@ _html2canvas.Parse = function (images, options) { } } + function h2czContext(zindex) { + return { + zindex: zindex, + children: [] + }; + } + function renderImage(ctx, element, image, bounds, borders) { var paddingLeft = getCSSInt(element, 'paddingLeft'), @@ -372,69 +527,67 @@ _html2canvas.Parse = function (images, options) { }); } - var getCurvePoints = (function(kappa) { - - return function(x, y, r1, r2) { - var ox = (r1) * kappa, // control point offset horizontal - oy = (r2) * kappa, // control point offset vertical - xm = x + r1, // x-middle - ym = y + r2; // y-middle - return { - topLeft: bezierCurve({ - x:x, - y:ym - }, { - x:x, - y:ym - oy - }, { - x:xm - ox, - y:y - }, { - x:xm, - y:y - }), - topRight: bezierCurve({ - x:x, - y:y - }, { - x:x + ox, - y:y - }, { - x:xm, - y:ym - oy - }, { - x:xm, - y:ym - }), - bottomRight: bezierCurve({ - x:xm, - y:y - }, { - x:xm, - y:y + oy - }, { - x:x + ox, - y:ym - }, { - x:x, - y:ym - }), - bottomLeft: bezierCurve({ - x:xm, - y:ym - }, { - x:xm - ox, - y:ym - }, { - x:x, - y:y + oy - }, { - x:x, - y:y - }) - }; + function getCurvePoints(x, y, r1, r2) { + var kappa = 4 * ((Math.sqrt(2) - 1) / 3); + var ox = (r1) * kappa, // control point offset horizontal + oy = (r2) * kappa, // control point offset vertical + xm = x + r1, // x-middle + ym = y + r2; // y-middle + return { + topLeft: bezierCurve({ + x:x, + y:ym + }, { + x:x, + y:ym - oy + }, { + x:xm - ox, + y:y + }, { + x:xm, + y:y + }), + topRight: bezierCurve({ + x:x, + y:y + }, { + x:x + ox, + y:y + }, { + x:xm, + y:ym - oy + }, { + x:xm, + y:ym + }), + bottomRight: bezierCurve({ + x:xm, + y:y + }, { + x:xm, + y:y + oy + }, { + x:x + ox, + y:ym + }, { + x:x, + y:ym + }), + bottomLeft: bezierCurve({ + x:xm, + y:ym + }, { + x:xm - ox, + y:ym + }, { + x:x, + y:y + oy + }, { + x:x, + y:y + }) }; - })(4 * ((Math.sqrt(2) - 1) / 3)); + } function bezierCurve(start, startControl, endControl, end) { @@ -773,20 +926,25 @@ _html2canvas.Parse = function (images, options) { function getPseudoElement(el, which) { var elStyle = window.getComputedStyle(el, which); - if(!elStyle || !elStyle.content || elStyle.content === "none" || elStyle.content === "-moz-alt-content" || elStyle.display === "none") { + var parentStyle = window.getComputedStyle(el); + // If no content attribute is present, the pseudo element is hidden, + // or the parent has a content property equal to the content on the pseudo element, + // move along. + if(!elStyle || !elStyle.content || elStyle.content === "none" || elStyle.content === "-moz-alt-content" || + elStyle.display === "none" || parentStyle.content === elStyle.content) { return; } - var content = elStyle.content + '', - first = content.substr( 0, 1 ); - //strips quotes - if(first === content.substr( content.length - 1 ) && first.match(/'|"/)) { - content = content.substr( 1, content.length - 2 ); + var content = elStyle.content + ''; + + // Strip inner quotes + if(content[0] === "'" || content[0] === "\"") { + content = content.replace(/(^['"])|(['"]$)/g, ''); } var isImage = content.substr( 0, 3 ) === 'url', elps = document.createElement( isImage ? 'img' : 'span' ); - elps.className = pseudoHide + "-before " + pseudoHide + "-after"; + elps.className = pseudoHide + "-element "; Object.keys(elStyle).filter(indexedProperty).forEach(function(prop) { // Prevent assigning of read only CSS Rules, ex. length, parentRule @@ -809,31 +967,6 @@ _html2canvas.Parse = function (images, options) { return (isNaN(window.parseInt(property, 10))); } - function injectPseudoElements(el, stack) { - var before = getPseudoElement(el, ':before'), - after = getPseudoElement(el, ':after'); - if(!before && !after) { - return; - } - - if(before) { - el.className += " " + pseudoHide + "-before"; - el.parentNode.insertBefore(before, el); - parseElement(before, stack, true); - el.parentNode.removeChild(before); - el.className = el.className.replace(pseudoHide + "-before", "").trim(); - } - - if (after) { - el.className += " " + pseudoHide + "-after"; - el.appendChild(after); - parseElement(after, stack, true); - el.removeChild(after); - el.className = el.className.replace(pseudoHide + "-after", "").trim(); - } - - } - function renderBackgroundRepeat(ctx, image, backgroundPosition, bounds) { var offsetX = Math.round(bounds.left + backgroundPosition.left), offsetY = Math.round(bounds.top + backgroundPosition.top); @@ -953,9 +1086,8 @@ _html2canvas.Parse = function (images, options) { return str.replace("px", ""); } - var transformRegExp = /(matrix)\((.+)\)/; - function getTransform(element, parentStack) { + var transformRegExp = /(matrix)\((.+)\)/; var transform = getCSS(element, "transform") || getCSS(element, "-webkit-transform") || getCSS(element, "-moz-transform") || getCSS(element, "-ms-transform") || getCSS(element, "-o-transform"); var transformOrigin = getCSS(element, "transform-origin") || getCSS(element, "-webkit-transform-origin") || getCSS(element, "-moz-transform-origin") || getCSS(element, "-ms-transform-origin") || getCSS(element, "-o-transform-origin") || "0px 0px"; @@ -1022,7 +1154,7 @@ _html2canvas.Parse = function (images, options) { return bounds; } - function renderElement(element, parentStack, pseudoElement, ignoreBackground) { + function renderElement(element, parentStack, ignoreBackground) { var transform = getTransform(element, parentStack), bounds = getBounds(element, transform), image, @@ -1052,10 +1184,6 @@ _html2canvas.Parse = function (images, options) { renderBorders(ctx, border.args, border.color); }); - if (!pseudoElement) { - injectPseudoElements(element, stack); - } - switch(element.nodeName){ case "IMG": if ((image = loadImage(element.getAttribute('src')))) { @@ -1096,48 +1224,51 @@ _html2canvas.Parse = function (images, options) { return (getCSS(element, 'display') !== "none" && getCSS(element, 'visibility') !== "hidden" && !element.hasAttribute("data-html2canvas-ignore")); } - function parseElement (element, stack, pseudoElement) { + function parseElement (element, stack, cb) { + if (!cb) { + cb = function(){}; + } if (isElementVisible(element)) { - stack = renderElement(element, stack, pseudoElement, false) || stack; + stack = renderElement(element, stack, false) || stack; if (!ignoreElementsRegExp.test(element.nodeName)) { - parseChildren(element, stack, pseudoElement); + return parseChildren(element, stack, cb); } } + cb(); } - function parseChildren(element, stack, pseudoElement) { - Util.Children(element).forEach(function(node) { + function parseChildren(element, stack, cb) { + var children = Util.Children(element); + // After all nodes have processed, finished() will call the cb. + // We add one and kick it off so this will still work when children.length === 0. + // Note that unless async is true, this will happen synchronously, just will callbacks. + var jobs = children.length + 1; + finished(); + + if (options.async) { + children.forEach(function(node) { + // Don't block the page from rendering + setTimeout(function(){ parseNode(node); }, 0); + }); + } else { + children.forEach(parseNode); + } + + function parseNode(node) { if (node.nodeType === node.ELEMENT_NODE) { - parseElement(node, stack, pseudoElement); + parseElement(node, stack, finished); } else if (node.nodeType === node.TEXT_NODE) { renderText(element, node, stack); + finished(); + } else { + finished(); + } + } + function finished(el) { + if (--jobs <= 0){ + Util.log("finished rendering " + children.length + " children."); + cb(); } - }); - } - - function init() { - var background = getCSS(document.documentElement, "backgroundColor"), - transparentBackground = (Util.isTransparent(background) && element === document.body), - stack = renderElement(element, null, false, transparentBackground); - parseChildren(element, stack); - - if (transparentBackground) { - background = stack.backgroundColor; } - - body.removeChild(hidePseudoElements); - return { - backgroundColor: background, - stack: stack - }; } - - return init(); -}; - -function h2czContext(zindex) { - return { - zindex: zindex, - children: [] - }; -} +}; \ No newline at end of file diff --git a/src/Util.js b/src/Util.js index 861402b..8ea63af 100644 --- a/src/Util.js +++ b/src/Util.js @@ -20,9 +20,9 @@ window.html2canvas = function(elements, opts) { useOverflow: true, letterRendering: false, chinese: false, + async: false, // If true, parsing will not block, but if the user scrolls during parse the image can get weird // render options - width: null, height: null, taintTest: true, // do a taint test with all images before applying to canvas @@ -39,21 +39,19 @@ window.html2canvas = function(elements, opts) { return; } } - queue = _html2canvas.Parse( images, options ); - - if (typeof options.onparsed === "function") { - if ( options.onparsed( queue ) === false ) { - return; + _html2canvas.Parse( images, options, function(queue) { + if (typeof options.onparsed === "function") { + if ( options.onparsed( queue ) === false ) { + return; + } } - } - - canvas = _html2canvas.Renderer( queue, options ); - - if (typeof options.onrendered === "function") { - options.onrendered( canvas ); - } + canvas = _html2canvas.Renderer( queue, options ); + if (typeof options.onrendered === "function") { + options.onrendered( canvas ); + } + }); }; // for pages without images, we still want this to be async, i.e. return methods before executing