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Need help in Posting pasted image to PHP via Javascript

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1 Endorsement
Last Modified: 2016-09-12
I'm a total Javascript-illiterate, but I need your help in modifying the following code so that it can

  1. allow users to paste their clipboard image (via Chrome), and
  2. upload the image along with other user input to my PHP script via POST.

I'd much appreciate it if you could help....



<!DOCTYPE html>
<html>
<head>

<title>Paste-able Canvas</title>
<script type="text/javascript">

function enablePasteForCanvas(canvas) {
  var pasteEvent = function(e) {
    (function() {
      var i;
      // Search image data in the clipboard 
      var items = e.clipboardData.items;
      var imageItem = null;
      for(i = 0; i < items.length; i++) {
        if(items[i].type.indexOf("image/") != -1) {
          imageItem = items[i];
          break;
        }
      }
      if(! imageItem) {
        console.log("clipboard does not contain an image.");
        return;
      }
      
      //convert:  clipboardData.items -> Blob -> Image 
      var blob = imageItem.getAsFile();
      var blobUrl = window.URL.createObjectURL(blob);
      var img = new Image();
      img.onload = function() {
        //Draw the image on canvas
        var context = canvas.getContext("2d");
        context.drawImage(img, 0, 0);
		
      };
      img.src = blobUrl;
    }());
    e.preventDefault();
  };
  
  canvas.addEventListener("focus", function(e){
    document.addEventListener("paste", pasteEvent, false);
  }, false);
  canvas.addEventListener("blur", function(e){
    document.removeEventListener("paste", pasteEvent, false);
  }, false);
}

window.addEventListener("load",function(e){
  enablePasteForCanvas(document.getElementById("my_canvas"));
}, false);


</script>

</head>
<body>

  <h2>Paste an image below</h2>(use Cntl + V)
  <br><br>Browswer:  Chrome only.<br>
  <table border=1 width=640><tr><td>
  
     <canvas id="my_canvas" width="640" height="280" tabindex="2"></canvas>

  </table>
  <br><br>
  

  <form type=POST action=drag.php>

     Text:  <input type=textbox name=text_1 width=10><br><br>
     Color: <input type=radio name=radio_1 value=blue> Blue  
	          <input type=radio name=radio_1 value=red> Red  <br><br><br>

   <input type=submit name=submit value=submit>

</form>
  
  
</body>
</html>

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