html2canvas
Version:
Screenshots with JavaScript
530 lines • 25.6 kB
JavaScript
"use strict";
var __awaiter = (this && this.__awaiter) || function (thisArg, _arguments, P, generator) {
function adopt(value) { return value instanceof P ? value : new P(function (resolve) { resolve(value); }); }
return new (P || (P = Promise))(function (resolve, reject) {
function fulfilled(value) { try { step(generator.next(value)); } catch (e) { reject(e); } }
function rejected(value) { try { step(generator["throw"](value)); } catch (e) { reject(e); } }
function step(result) { result.done ? resolve(result.value) : adopt(result.value).then(fulfilled, rejected); }
step((generator = generator.apply(thisArg, _arguments || [])).next());
});
};
var __generator = (this && this.__generator) || function (thisArg, body) {
var _ = { label: 0, sent: function() { if (t[0] & 1) throw t[1]; return t[1]; }, trys: [], ops: [] }, f, y, t, g;
return g = { next: verb(0), "throw": verb(1), "return": verb(2) }, typeof Symbol === "function" && (g[Symbol.iterator] = function() { return this; }), g;
function verb(n) { return function (v) { return step([n, v]); }; }
function step(op) {
if (f) throw new TypeError("Generator is already executing.");
while (_) try {
if (f = 1, y && (t = op[0] & 2 ? y["return"] : op[0] ? y["throw"] || ((t = y["return"]) && t.call(y), 0) : y.next) && !(t = t.call(y, op[1])).done) return t;
if (y = 0, t) op = [op[0] & 2, t.value];
switch (op[0]) {
case 0: case 1: t = op; break;
case 4: _.label++; return { value: op[1], done: false };
case 5: _.label++; y = op[1]; op = [0]; continue;
case 7: op = _.ops.pop(); _.trys.pop(); continue;
default:
if (!(t = _.trys, t = t.length > 0 && t[t.length - 1]) && (op[0] === 6 || op[0] === 2)) { _ = 0; continue; }
if (op[0] === 3 && (!t || (op[1] > t[0] && op[1] < t[3]))) { _.label = op[1]; break; }
if (op[0] === 6 && _.label < t[1]) { _.label = t[1]; t = op; break; }
if (t && _.label < t[2]) { _.label = t[2]; _.ops.push(op); break; }
if (t[2]) _.ops.pop();
_.trys.pop(); continue;
}
op = body.call(thisArg, _);
} catch (e) { op = [6, e]; y = 0; } finally { f = t = 0; }
if (op[0] & 5) throw op[1]; return { value: op[0] ? op[1] : void 0, done: true };
}
};
Object.defineProperty(exports, "__esModule", { value: true });
exports.copyCSSStyles = exports.DocumentCloner = void 0;
var node_parser_1 = require("./node-parser");
var parser_1 = require("../css/syntax/parser");
var counter_1 = require("../css/types/functions/counter");
var list_style_type_1 = require("../css/property-descriptors/list-style-type");
var index_1 = require("../css/index");
var quotes_1 = require("../css/property-descriptors/quotes");
var debugger_1 = require("../core/debugger");
var IGNORE_ATTRIBUTE = 'data-html2canvas-ignore';
var DocumentCloner = /** @class */ (function () {
function DocumentCloner(context, element, options) {
this.context = context;
this.options = options;
this.scrolledElements = [];
this.referenceElement = element;
this.counters = new counter_1.CounterState();
this.quoteDepth = 0;
if (!element.ownerDocument) {
throw new Error('Cloned element does not have an owner document');
}
this.documentElement = this.cloneNode(element.ownerDocument.documentElement, false);
}
DocumentCloner.prototype.toIFrame = function (ownerDocument, windowSize) {
var _this = this;
var iframe = createIFrameContainer(ownerDocument, windowSize);
if (!iframe.contentWindow) {
return Promise.reject("Unable to find iframe window");
}
var scrollX = ownerDocument.defaultView.pageXOffset;
var scrollY = ownerDocument.defaultView.pageYOffset;
var cloneWindow = iframe.contentWindow;
var documentClone = cloneWindow.document;
/* Chrome doesn't detect relative background-images assigned in inline <style> sheets when fetched through getComputedStyle
if window url is about:blank, we can assign the url to current by writing onto the document
*/
var iframeLoad = iframeLoader(iframe).then(function () { return __awaiter(_this, void 0, void 0, function () {
var onclone, referenceElement;
return __generator(this, function (_a) {
switch (_a.label) {
case 0:
this.scrolledElements.forEach(restoreNodeScroll);
if (cloneWindow) {
cloneWindow.scrollTo(windowSize.left, windowSize.top);
if (/(iPad|iPhone|iPod)/g.test(navigator.userAgent) &&
(cloneWindow.scrollY !== windowSize.top || cloneWindow.scrollX !== windowSize.left)) {
this.context.logger.warn('Unable to restore scroll position for cloned document');
this.context.windowBounds = this.context.windowBounds.add(cloneWindow.scrollX - windowSize.left, cloneWindow.scrollY - windowSize.top, 0, 0);
}
}
onclone = this.options.onclone;
referenceElement = this.clonedReferenceElement;
if (typeof referenceElement === 'undefined') {
return [2 /*return*/, Promise.reject("Error finding the " + this.referenceElement.nodeName + " in the cloned document")];
}
if (!(documentClone.fonts && documentClone.fonts.ready)) return [3 /*break*/, 2];
return [4 /*yield*/, documentClone.fonts.ready];
case 1:
_a.sent();
_a.label = 2;
case 2:
if (!/(AppleWebKit)/g.test(navigator.userAgent)) return [3 /*break*/, 4];
return [4 /*yield*/, imagesReady(documentClone)];
case 3:
_a.sent();
_a.label = 4;
case 4:
if (typeof onclone === 'function') {
return [2 /*return*/, Promise.resolve()
.then(function () { return onclone(documentClone, referenceElement); })
.then(function () { return iframe; })];
}
return [2 /*return*/, iframe];
}
});
}); });
documentClone.open();
documentClone.write(serializeDoctype(document.doctype) + "<html></html>");
// Chrome scrolls the parent document for some reason after the write to the cloned window???
restoreOwnerScroll(this.referenceElement.ownerDocument, scrollX, scrollY);
documentClone.replaceChild(documentClone.adoptNode(this.documentElement), documentClone.documentElement);
documentClone.close();
return iframeLoad;
};
DocumentCloner.prototype.createElementClone = function (node) {
if (debugger_1.isDebugging(node, 2 /* CLONE */)) {
debugger;
}
if (node_parser_1.isCanvasElement(node)) {
return this.createCanvasClone(node);
}
if (node_parser_1.isVideoElement(node)) {
return this.createVideoClone(node);
}
if (node_parser_1.isStyleElement(node)) {
return this.createStyleClone(node);
}
var clone = node.cloneNode(false);
if (node_parser_1.isImageElement(clone)) {
if (node_parser_1.isImageElement(node) && node.currentSrc && node.currentSrc !== node.src) {
clone.src = node.currentSrc;
clone.srcset = '';
}
if (clone.loading === 'lazy') {
clone.loading = 'eager';
}
}
if (node_parser_1.isCustomElement(clone)) {
return this.createCustomElementClone(clone);
}
return clone;
};
DocumentCloner.prototype.createCustomElementClone = function (node) {
var clone = document.createElement('html2canvascustomelement');
exports.copyCSSStyles(node.style, clone);
return clone;
};
DocumentCloner.prototype.createStyleClone = function (node) {
try {
var sheet = node.sheet;
if (sheet && sheet.cssRules) {
var css = [].slice.call(sheet.cssRules, 0).reduce(function (css, rule) {
if (rule && typeof rule.cssText === 'string') {
return css + rule.cssText;
}
return css;
}, '');
var style = node.cloneNode(false);
style.textContent = css;
return style;
}
}
catch (e) {
// accessing node.sheet.cssRules throws a DOMException
this.context.logger.error('Unable to access cssRules property', e);
if (e.name !== 'SecurityError') {
throw e;
}
}
return node.cloneNode(false);
};
DocumentCloner.prototype.createCanvasClone = function (canvas) {
var _a;
if (this.options.inlineImages && canvas.ownerDocument) {
var img = canvas.ownerDocument.createElement('img');
try {
img.src = canvas.toDataURL();
return img;
}
catch (e) {
this.context.logger.info("Unable to inline canvas contents, canvas is tainted", canvas);
}
}
var clonedCanvas = canvas.cloneNode(false);
try {
clonedCanvas.width = canvas.width;
clonedCanvas.height = canvas.height;
var ctx = canvas.getContext('2d');
var clonedCtx = clonedCanvas.getContext('2d');
if (clonedCtx) {
if (!this.options.allowTaint && ctx) {
clonedCtx.putImageData(ctx.getImageData(0, 0, canvas.width, canvas.height), 0, 0);
}
else {
var gl = (_a = canvas.getContext('webgl2')) !== null && _a !== void 0 ? _a : canvas.getContext('webgl');
if (gl) {
var attribs = gl.getContextAttributes();
if ((attribs === null || attribs === void 0 ? void 0 : attribs.preserveDrawingBuffer) === false) {
this.context.logger.warn('Unable to clone WebGL context as it has preserveDrawingBuffer=false', canvas);
}
}
clonedCtx.drawImage(canvas, 0, 0);
}
}
return clonedCanvas;
}
catch (e) {
this.context.logger.info("Unable to clone canvas as it is tainted", canvas);
}
return clonedCanvas;
};
DocumentCloner.prototype.createVideoClone = function (video) {
var canvas = video.ownerDocument.createElement('canvas');
canvas.width = video.offsetWidth;
canvas.height = video.offsetHeight;
var ctx = canvas.getContext('2d');
try {
if (ctx) {
ctx.drawImage(video, 0, 0, canvas.width, canvas.height);
if (!this.options.allowTaint) {
ctx.getImageData(0, 0, canvas.width, canvas.height);
}
}
return canvas;
}
catch (e) {
this.context.logger.info("Unable to clone video as it is tainted", video);
}
var blankCanvas = video.ownerDocument.createElement('canvas');
blankCanvas.width = video.offsetWidth;
blankCanvas.height = video.offsetHeight;
return blankCanvas;
};
DocumentCloner.prototype.appendChildNode = function (clone, child, copyStyles) {
if (!node_parser_1.isElementNode(child) ||
(!node_parser_1.isScriptElement(child) &&
!child.hasAttribute(IGNORE_ATTRIBUTE) &&
(typeof this.options.ignoreElements !== 'function' || !this.options.ignoreElements(child)))) {
if (!this.options.copyStyles || !node_parser_1.isElementNode(child) || !node_parser_1.isStyleElement(child)) {
clone.appendChild(this.cloneNode(child, copyStyles));
}
}
};
DocumentCloner.prototype.cloneChildNodes = function (node, clone, copyStyles) {
var _this = this;
for (var child = node.shadowRoot ? node.shadowRoot.firstChild : node.firstChild; child; child = child.nextSibling) {
if (node_parser_1.isElementNode(child) && node_parser_1.isSlotElement(child) && typeof child.assignedNodes === 'function') {
var assignedNodes = child.assignedNodes();
if (assignedNodes.length) {
assignedNodes.forEach(function (assignedNode) { return _this.appendChildNode(clone, assignedNode, copyStyles); });
}
}
else {
this.appendChildNode(clone, child, copyStyles);
}
}
};
DocumentCloner.prototype.cloneNode = function (node, copyStyles) {
if (node_parser_1.isTextNode(node)) {
return document.createTextNode(node.data);
}
if (!node.ownerDocument) {
return node.cloneNode(false);
}
var window = node.ownerDocument.defaultView;
if (window && node_parser_1.isElementNode(node) && (node_parser_1.isHTMLElementNode(node) || node_parser_1.isSVGElementNode(node))) {
var clone = this.createElementClone(node);
clone.style.transitionProperty = 'none';
var style = window.getComputedStyle(node);
var styleBefore = window.getComputedStyle(node, ':before');
var styleAfter = window.getComputedStyle(node, ':after');
if (this.referenceElement === node && node_parser_1.isHTMLElementNode(clone)) {
this.clonedReferenceElement = clone;
}
if (node_parser_1.isBodyElement(clone)) {
createPseudoHideStyles(clone);
}
var counters = this.counters.parse(new index_1.CSSParsedCounterDeclaration(this.context, style));
var before = this.resolvePseudoContent(node, clone, styleBefore, PseudoElementType.BEFORE);
if (node_parser_1.isCustomElement(node)) {
copyStyles = true;
}
if (!node_parser_1.isVideoElement(node)) {
this.cloneChildNodes(node, clone, copyStyles);
}
if (before) {
clone.insertBefore(before, clone.firstChild);
}
var after = this.resolvePseudoContent(node, clone, styleAfter, PseudoElementType.AFTER);
if (after) {
clone.appendChild(after);
}
this.counters.pop(counters);
if ((style && (this.options.copyStyles || node_parser_1.isSVGElementNode(node)) && !node_parser_1.isIFrameElement(node)) ||
copyStyles) {
exports.copyCSSStyles(style, clone);
}
if (node.scrollTop !== 0 || node.scrollLeft !== 0) {
this.scrolledElements.push([clone, node.scrollLeft, node.scrollTop]);
}
if ((node_parser_1.isTextareaElement(node) || node_parser_1.isSelectElement(node)) &&
(node_parser_1.isTextareaElement(clone) || node_parser_1.isSelectElement(clone))) {
clone.value = node.value;
}
return clone;
}
return node.cloneNode(false);
};
DocumentCloner.prototype.resolvePseudoContent = function (node, clone, style, pseudoElt) {
var _this = this;
if (!style) {
return;
}
var value = style.content;
var document = clone.ownerDocument;
if (!document || !value || value === 'none' || value === '-moz-alt-content' || style.display === 'none') {
return;
}
this.counters.parse(new index_1.CSSParsedCounterDeclaration(this.context, style));
var declaration = new index_1.CSSParsedPseudoDeclaration(this.context, style);
var anonymousReplacedElement = document.createElement('html2canvaspseudoelement');
exports.copyCSSStyles(style, anonymousReplacedElement);
declaration.content.forEach(function (token) {
if (token.type === 0 /* STRING_TOKEN */) {
anonymousReplacedElement.appendChild(document.createTextNode(token.value));
}
else if (token.type === 22 /* URL_TOKEN */) {
var img = document.createElement('img');
img.src = token.value;
img.style.opacity = '1';
anonymousReplacedElement.appendChild(img);
}
else if (token.type === 18 /* FUNCTION */) {
if (token.name === 'attr') {
var attr = token.values.filter(parser_1.isIdentToken);
if (attr.length) {
anonymousReplacedElement.appendChild(document.createTextNode(node.getAttribute(attr[0].value) || ''));
}
}
else if (token.name === 'counter') {
var _a = token.values.filter(parser_1.nonFunctionArgSeparator), counter = _a[0], counterStyle = _a[1];
if (counter && parser_1.isIdentToken(counter)) {
var counterState = _this.counters.getCounterValue(counter.value);
var counterType = counterStyle && parser_1.isIdentToken(counterStyle)
? list_style_type_1.listStyleType.parse(_this.context, counterStyle.value)
: 3 /* DECIMAL */;
anonymousReplacedElement.appendChild(document.createTextNode(counter_1.createCounterText(counterState, counterType, false)));
}
}
else if (token.name === 'counters') {
var _b = token.values.filter(parser_1.nonFunctionArgSeparator), counter = _b[0], delim = _b[1], counterStyle = _b[2];
if (counter && parser_1.isIdentToken(counter)) {
var counterStates = _this.counters.getCounterValues(counter.value);
var counterType_1 = counterStyle && parser_1.isIdentToken(counterStyle)
? list_style_type_1.listStyleType.parse(_this.context, counterStyle.value)
: 3 /* DECIMAL */;
var separator = delim && delim.type === 0 /* STRING_TOKEN */ ? delim.value : '';
var text = counterStates
.map(function (value) { return counter_1.createCounterText(value, counterType_1, false); })
.join(separator);
anonymousReplacedElement.appendChild(document.createTextNode(text));
}
}
else {
// console.log('FUNCTION_TOKEN', token);
}
}
else if (token.type === 20 /* IDENT_TOKEN */) {
switch (token.value) {
case 'open-quote':
anonymousReplacedElement.appendChild(document.createTextNode(quotes_1.getQuote(declaration.quotes, _this.quoteDepth++, true)));
break;
case 'close-quote':
anonymousReplacedElement.appendChild(document.createTextNode(quotes_1.getQuote(declaration.quotes, --_this.quoteDepth, false)));
break;
default:
// safari doesn't parse string tokens correctly because of lack of quotes
anonymousReplacedElement.appendChild(document.createTextNode(token.value));
}
}
});
anonymousReplacedElement.className = PSEUDO_HIDE_ELEMENT_CLASS_BEFORE + " " + PSEUDO_HIDE_ELEMENT_CLASS_AFTER;
var newClassName = pseudoElt === PseudoElementType.BEFORE
? " " + PSEUDO_HIDE_ELEMENT_CLASS_BEFORE
: " " + PSEUDO_HIDE_ELEMENT_CLASS_AFTER;
if (node_parser_1.isSVGElementNode(clone)) {
clone.className.baseValue += newClassName;
}
else {
clone.className += newClassName;
}
return anonymousReplacedElement;
};
DocumentCloner.destroy = function (container) {
if (container.parentNode) {
container.parentNode.removeChild(container);
return true;
}
return false;
};
return DocumentCloner;
}());
exports.DocumentCloner = DocumentCloner;
var PseudoElementType;
(function (PseudoElementType) {
PseudoElementType[PseudoElementType["BEFORE"] = 0] = "BEFORE";
PseudoElementType[PseudoElementType["AFTER"] = 1] = "AFTER";
})(PseudoElementType || (PseudoElementType = {}));
var createIFrameContainer = function (ownerDocument, bounds) {
var cloneIframeContainer = ownerDocument.createElement('iframe');
cloneIframeContainer.className = 'html2canvas-container';
cloneIframeContainer.style.visibility = 'hidden';
cloneIframeContainer.style.position = 'fixed';
cloneIframeContainer.style.left = '-10000px';
cloneIframeContainer.style.top = '0px';
cloneIframeContainer.style.border = '0';
cloneIframeContainer.width = bounds.width.toString();
cloneIframeContainer.height = bounds.height.toString();
cloneIframeContainer.scrolling = 'no'; // ios won't scroll without it
cloneIframeContainer.setAttribute(IGNORE_ATTRIBUTE, 'true');
ownerDocument.body.appendChild(cloneIframeContainer);
return cloneIframeContainer;
};
var imageReady = function (img) {
return new Promise(function (resolve) {
if (img.complete) {
resolve();
return;
}
if (!img.src) {
resolve();
return;
}
img.onload = resolve;
img.onerror = resolve;
});
};
var imagesReady = function (document) {
return Promise.all([].slice.call(document.images, 0).map(imageReady));
};
var iframeLoader = function (iframe) {
return new Promise(function (resolve, reject) {
var cloneWindow = iframe.contentWindow;
if (!cloneWindow) {
return reject("No window assigned for iframe");
}
var documentClone = cloneWindow.document;
cloneWindow.onload = iframe.onload = function () {
cloneWindow.onload = iframe.onload = null;
var interval = setInterval(function () {
if (documentClone.body.childNodes.length > 0 && documentClone.readyState === 'complete') {
clearInterval(interval);
resolve(iframe);
}
}, 50);
};
});
};
var ignoredStyleProperties = [
'all',
'd',
'content' // Safari shows pseudoelements if content is set
];
var copyCSSStyles = function (style, target) {
// Edge does not provide value for cssText
for (var i = style.length - 1; i >= 0; i--) {
var property = style.item(i);
if (ignoredStyleProperties.indexOf(property) === -1) {
target.style.setProperty(property, style.getPropertyValue(property));
}
}
return target;
};
exports.copyCSSStyles = copyCSSStyles;
var serializeDoctype = function (doctype) {
var str = '';
if (doctype) {
str += '<!DOCTYPE ';
if (doctype.name) {
str += doctype.name;
}
if (doctype.internalSubset) {
str += doctype.internalSubset;
}
if (doctype.publicId) {
str += "\"" + doctype.publicId + "\"";
}
if (doctype.systemId) {
str += "\"" + doctype.systemId + "\"";
}
str += '>';
}
return str;
};
var restoreOwnerScroll = function (ownerDocument, x, y) {
if (ownerDocument &&
ownerDocument.defaultView &&
(x !== ownerDocument.defaultView.pageXOffset || y !== ownerDocument.defaultView.pageYOffset)) {
ownerDocument.defaultView.scrollTo(x, y);
}
};
var restoreNodeScroll = function (_a) {
var element = _a[0], x = _a[1], y = _a[2];
element.scrollLeft = x;
element.scrollTop = y;
};
var PSEUDO_BEFORE = ':before';
var PSEUDO_AFTER = ':after';
var PSEUDO_HIDE_ELEMENT_CLASS_BEFORE = '___html2canvas___pseudoelement_before';
var PSEUDO_HIDE_ELEMENT_CLASS_AFTER = '___html2canvas___pseudoelement_after';
var PSEUDO_HIDE_ELEMENT_STYLE = "{\n content: \"\" !important;\n display: none !important;\n}";
var createPseudoHideStyles = function (body) {
createStyles(body, "." + PSEUDO_HIDE_ELEMENT_CLASS_BEFORE + PSEUDO_BEFORE + PSEUDO_HIDE_ELEMENT_STYLE + "\n ." + PSEUDO_HIDE_ELEMENT_CLASS_AFTER + PSEUDO_AFTER + PSEUDO_HIDE_ELEMENT_STYLE);
};
var createStyles = function (body, styles) {
var document = body.ownerDocument;
if (document) {
var style = document.createElement('style');
style.textContent = styles;
body.appendChild(style);
}
};
//# sourceMappingURL=document-cloner.js.map