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/**
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* @license Highstock JS v2.1.8 (2015-08-20)
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* Client side exporting module
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*
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* (c) 2015 Torstein Honsi / Oystein Moseng
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*
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* License: www.highcharts.com/license
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*/
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// JSLint options:
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/*global Highcharts, HighchartsAdapter, document, window, Blob, MSBlobBuilder */
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(function (Highcharts) {
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// Dummy object so we can reuse our canvas-tools.js without errors
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Highcharts.CanVGRenderer = {};
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/**
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* Add a new method to the Chart object to perform a local download
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*/
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Highcharts.Chart.prototype.exportChartLocal = function (exportingOptions, chartOptions) {
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var chart = this,
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options = Highcharts.merge(chart.options.exporting, exportingOptions),
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webKit = navigator.userAgent.indexOf('WebKit') > -1 && navigator.userAgent.indexOf("Chrome") < 0, // Webkit and not chrome
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scale = options.scale || 2,
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chartCopyContainer,
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domurl = window.URL || window.webkitURL || window,
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images,
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imagesEmbedded = 0,
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el,
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i,
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l,
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fallbackToExportServer = function () {
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if (options.fallbackToExportServer === false) {
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throw 'Fallback to export server disabled';
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}
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chart.exportChart(options);
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},
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// Get data:URL from image URL
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// Pass in callbacks to handle results. finallyCallback is always called at the end of the process. Supplying this callback is optional.
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// All callbacks receive two arguments: imageURL, and callbackArgs. callbackArgs is used only by callbacks and can contain whatever.
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imageToDataUrl = function (imageURL, callbackArgs, successCallback, taintedCallback, noCanvasSupportCallback, failedLoadCallback, finallyCallback) {
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var img = new Image();
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if (!webKit) {
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img.crossOrigin = 'Anonymous'; // For some reason Safari chokes on this attribute
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}
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img.onload = function () {
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var canvas = document.createElement('canvas'),
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ctx = canvas.getContext && canvas.getContext('2d'),
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dataURL;
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if (!ctx) {
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noCanvasSupportCallback(imageURL, callbackArgs);
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} else {
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canvas.height = img.height * scale;
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canvas.width = img.width * scale;
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ctx.drawImage(img, 0, 0, canvas.width, canvas.height);
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// Now we try to get the contents of the canvas.
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try {
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dataURL = canvas.toDataURL();
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successCallback(dataURL, callbackArgs);
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} catch (e) {
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// Failed - either tainted canvas or something else went horribly wrong
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if (e.name === 'SecurityError' || e.name === 'SECURITY_ERR' || e.message === 'SecurityError') {
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taintedCallback(imageURL, callbackArgs);
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} else {
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throw e;
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}
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}
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}
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if (finallyCallback) {
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finallyCallback(imageURL, callbackArgs);
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}
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};
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img.onerror = function () {
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failedLoadCallback(imageURL, callbackArgs);
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if (finallyCallback) {
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finallyCallback(imageURL, callbackArgs);
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}
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};
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img.src = imageURL;
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},
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// Get blob URL from SVG code. Falls back to normal data URI.
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svgToDataUrl = function (svg) {
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try {
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// Safari requires data URI since it doesn't allow navigation to blob URLs
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if (!webKit) {
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return domurl.createObjectURL(new Blob([svg], { type: 'image/svg+xml;charset-utf-16'}));
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}
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} catch (e) {
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// Ignore
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}
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return 'data:image/svg+xml;charset=UTF-8,' + encodeURIComponent(svg);
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},
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// Download contents by dataURL/blob
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download = function (dataURL, extension) {
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var a = document.createElement('a'),
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filename = (options.filename || 'chart') + '.' + extension,
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windowRef;
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// IE specific blob implementation
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if (navigator.msSaveOrOpenBlob) {
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navigator.msSaveOrOpenBlob(dataURL, filename);
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return;
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}
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// Try HTML5 download attr if supported
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if (typeof a.download !== 'undefined') {
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a.href = dataURL;
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a.download = filename; // HTML5 download attribute
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a.target = '_blank';
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document.body.appendChild(a);
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a.click();
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document.body.removeChild(a);
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} else {
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// No download attr, just opening data URI
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try {
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windowRef = window.open(dataURL, 'chart');
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if (typeof windowRef === 'undefined' || windowRef === null) {
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throw 1;
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}
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} catch (e) {
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// window.open failed, trying location.href
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window.location.href = dataURL;
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}
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}
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},
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// Get data URL to an image of the chart and call download on it
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initiateDownload = function () {
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var svgurl,
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blob,
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svg = chart.sanitizeSVG(chartCopyContainer.innerHTML); // SVG of chart copy
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// Initiate download depending on file type
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if (options && options.type === 'image/svg+xml') {
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// SVG download. In this case, we want to use Microsoft specific Blob if available
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try {
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if (navigator.msSaveOrOpenBlob) {
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blob = new MSBlobBuilder();
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blob.append(svg);
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svgurl = blob.getBlob('image/svg+xml');
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} else {
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svgurl = svgToDataUrl(svg);
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}
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download(svgurl, 'svg');
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} catch (e) {
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fallbackToExportServer();
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}
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} else {
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// PNG download - create bitmap from SVG
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// First, try to get PNG by rendering on canvas
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svgurl = svgToDataUrl(svg);
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imageToDataUrl(svgurl, { /* args */ }, function (imageURL) {
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// Success
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try {
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download(imageURL, 'png');
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} catch (e) {
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fallbackToExportServer();
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}
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}, function () {
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// Failed due to tainted canvas
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// Create new and untainted canvas
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var canvas = document.createElement('canvas'),
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ctx = canvas.getContext('2d'),
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imageWidth = svg.match(/^<svg[^>]*width\s*=\s*\"?(\d+)\"?[^>]*>/)[1] * scale,
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imageHeight = svg.match(/^<svg[^>]*height\s*=\s*\"?(\d+)\"?[^>]*>/)[1] * scale,
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downloadWithCanVG = function () {
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ctx.drawSvg(svg, 0, 0, imageWidth, imageHeight);
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try {
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download(navigator.msSaveOrOpenBlob ? canvas.msToBlob() : canvas.toDataURL('image/png'), 'png');
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} catch (e) {
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fallbackToExportServer();
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}
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};
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canvas.width = imageWidth;
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canvas.height = imageHeight;
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if (window.canvg) {
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// Use preloaded canvg
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downloadWithCanVG();
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} else {
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// Must load canVG first
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chart.showLoading();
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HighchartsAdapter.getScript(Highcharts.getOptions().global.canvasToolsURL, function () {
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chart.hideLoading();
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downloadWithCanVG();
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});
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}
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},
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// No canvas support
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fallbackToExportServer,
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// Failed to load image
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fallbackToExportServer,
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// Finally
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function () {
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try {
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domurl.revokeObjectURL(svgurl);
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} catch (e) {
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// Ignore
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}
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});
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}
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};
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// Hook into getSVG to get a copy of the chart copy's container
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Highcharts.wrap(Highcharts.Chart.prototype, 'getChartHTML', function (proceed) {
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chartCopyContainer = this.container.cloneNode(true);
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return proceed.apply(this, Array.prototype.slice.call(arguments, 1));
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});
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// Trigger hook to get chart copy
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chart.getSVGForExport(options, chartOptions);
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images = chartCopyContainer.getElementsByTagName('image');
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try {
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// If there are no images to embed, just go ahead and start the download process
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if (!images.length) {
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initiateDownload();
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}
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// Success handler, we converted image to base64!
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function embeddedSuccess(imageURL, callbackArgs) {
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++imagesEmbedded;
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// Change image href in chart copy
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callbackArgs.imageElement.setAttributeNS('http://www.w3.org/1999/xlink', 'href', imageURL);
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// Start download when done with the last image
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if (imagesEmbedded === images.length) {
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initiateDownload();
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}
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}
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// Go through the images we want to embed
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for (i = 0, l = images.length; i < l; ++i) {
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el = images[i];
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imageToDataUrl(el.getAttributeNS('http://www.w3.org/1999/xlink', 'href'), { imageElement: el },
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embeddedSuccess,
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// Tainted canvas
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fallbackToExportServer,
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// No canvas support
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fallbackToExportServer,
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// Failed to load source
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fallbackToExportServer
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);
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}
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} catch (e) {
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fallbackToExportServer();
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}
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};
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// Extend the default options to use the local exporter logic
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Highcharts.getOptions().exporting.buttons.contextButton.menuItems = [{
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textKey: 'printChart',
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onclick: function () {
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this.print();
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}
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}, {
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separator: true
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}, {
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textKey: 'downloadPNG',
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onclick: function () {
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this.exportChartLocal();
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}
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}, {
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textKey: 'downloadSVG',
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onclick: function () {
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this.exportChartLocal({
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type: 'image/svg+xml'
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});
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}
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}];
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}(Highcharts));
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