50 lines
1.5 KiB
JavaScript
50 lines
1.5 KiB
JavaScript
/* globals jQuery */
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const $ = jQuery;
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$('a').click(function () {
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const {href} = this;
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const target = window.parent;
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const post = (message) => {
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// Todo: Make origin customizable as set by opening window
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// Todo: If dropping IE9, avoid stringifying
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target.postMessage(JSON.stringify({
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namespace: 'imagelib',
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...message
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}), '*');
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};
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// Convert Non-SVG images to data URL first
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// (this could also have been done server-side by the library)
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// Send metadata (also indicates file is about to be sent)
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post({
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name: $(this).text(),
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id: href
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});
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if (!href.includes('.svg')) {
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const img = new Image();
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img.addEventListener('load', function () {
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const canvas = document.createElement('canvas');
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canvas.width = this.width;
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canvas.height = this.height;
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// load the raster image into the canvas
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canvas.getContext('2d').drawImage(this, 0, 0);
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// retrieve the data: URL
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let data;
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try {
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data = canvas.toDataURL();
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} catch (err) {
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// This fails in Firefox with `file:///` URLs :(
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// Todo: This could use a generic alert library instead
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alert('Data URL conversion failed: ' + err); // eslint-disable-line no-alert
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data = '';
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}
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post({href, data});
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});
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img.src = href;
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} else {
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// Do ajax request for image's href value
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$.get(href, function (data) {
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post({href, data});
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}, 'html'); // 'html' is necessary to keep returned data as a string
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}
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return false;
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});
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