Created
March 3, 2014 17:42
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Paste image from clipboard to canvas. Convert to base64 image string.
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| <!DOCTYPE html> | |
| <html> | |
| <head> | |
| <title>Paste Image</title> | |
| <script type="text/javascript"> | |
| var imageObj = new Image(); | |
| window.onload = function() { | |
| document.getElementById("pasteTarget"). | |
| addEventListener("paste", handlePaste); | |
| var canvas = document.getElementById('canvasTarget'); | |
| var context = canvas.getContext('2d'); | |
| imageObj.onload = function() { | |
| context.drawImage(imageObj, 0, 0); | |
| document.getElementById('base64image').value = canvas.toDataURL('image/png'); | |
| }; | |
| }; | |
| function handlePaste(e) { | |
| for (var i = 0 ; i < e.clipboardData.items.length ; i++) { | |
| var item = e.clipboardData.items[i]; | |
| console.log("Item type: " + item.type); | |
| if (item.type.indexOf("image") != -1) { | |
| //uploadFile(item.getAsFile()); | |
| imageObj.src = URL.createObjectURL(item.getAsFile()); | |
| } else { | |
| console.log("Discarding non-image paste data"); | |
| } | |
| } | |
| } | |
| function uploadFile(file) { | |
| var xhr = new XMLHttpRequest(); | |
| xhr.upload.onprogress = function(e) { | |
| var percentComplete = (e.loaded / e.total) * 100; | |
| console.log("Uploaded: " + percentComplete + "%"); | |
| }; | |
| xhr.onload = function() { | |
| if (xhr.status == 200) { | |
| alert("Sucess! Upload completed"); | |
| } else { | |
| alert("Error! Upload failed"); | |
| } | |
| }; | |
| xhr.onerror = function() { | |
| alert("Error! Upload failed. Can not connect to server."); | |
| }; | |
| xhr.open("POST", "FileUploader", true); | |
| xhr.setRequestHeader("Content-Type", file.type); | |
| xhr.send(file); | |
| } | |
| </script> | |
| </head> | |
| <body> | |
| <div style="width: 200px; height: 200px; background: grey" id="pasteTarget"> | |
| Click and paste here. | |
| </div> | |
| <div style="height:10px;"></div> | |
| <canvas style="width: 200px; height: 200px; background: grey" id="canvasTarget"></canvas> | |
| <h3>base64image</h3> | |
| <textarea id="base64image" style="width:100%;height:300px;"></textarea> | |
| </body> | |
| </html> |
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Credit goes to http://mobiarch.wordpress.com/2013/09/25/upload-image-by-copy-and-paste/ for the original code. I just edited it for my uses.