Created
August 21, 2017 08:49
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画像をdata url形式に変換するサンプル
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| <html> | |
| <title></title> | |
| <body> | |
| <script> | |
| window.onload = function() { | |
| var image = document.getElementById("cat_image") | |
| var data_url = imageToBase64(image, "image/jpg") | |
| console.log(data_url) | |
| document.getElementById("hoge").innerHTML = data_url | |
| } | |
| function imageToBase64(img, mime_type) { | |
| // New Canvas | |
| var canvas = document.createElement('canvas'); | |
| console.log(canvas) | |
| canvas.width = img.width; | |
| canvas.height = img.height; | |
| // Draw Image | |
| var ctx = canvas.getContext('2d'); | |
| ctx.drawImage(img, 0, 0); | |
| // To Base64 | |
| return canvas.toDataURL(mime_type); | |
| } | |
| </script> | |
| <img src="http://livedoor.blogimg.jp/fightersmatome/imgs/3/b/3b3b5e2e.png" id="cat_image" style="display: none"> | |
| <div id="hoge"></div> | |
| </body> | |
| </html> |
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Uncaught DOMException: Failed to execute 'toDataURL' on 'HTMLCanvasElement': Tainted canvases may not be exported.