Convert Dataurl To Blob And Submit Through Ajax

I'm using the imgly image cropper plugin, slightly modified for my app. It currently converts an image to a dataUrland spits out the image as a base64 image that I can save as a jp

Solution 1:

Updated

"Assuming I keep the app in the same form, I'm trying to figure out how to get the dataURL into the post function."

Try, at lines 15 - 103 at http://jsfiddle.net/mattography/Lgduvce1/6/

var blob; // declare `blob`// As soon as the user selects a file...
  fileInput.addEventListener("change", function (event) {
    var file; // declare `file`    var fileToBlob = event.target.files[0];
          blob = newBlob([fileToBlob], {"type":fileToBlob.type});
          // do stuff with blobconsole.log(blob);
    // Find the selected fileif(event.target.files) {
      file = event.target.files[0];
    } else {
      file = event.target.value;
    }

    // Use FileReader to turn the selected// file into a data url. ImglyKit needs// a data url or an imagevar reader = newFileReader();
    reader.onload = (function(file) {
      returnfunction (e) {
        data = e.target.result;

        // Run ImglyKit with the selected filetry {
          imgly.run(data);
        } catch (e) {
          if(e.name == "NoSupportError") {
            alert("Your browser does not support canvas.");
          } elseif(e.name == "InvalidError") {
            alert("The given file is not an image");
          }
        }
      };
    })(file);
    reader.readAsDataURL(file);
  });

  // As soon as the user clicks the render button...// Listen for "Render final image" click
  renderButton.click(function (event) {
    var dataUrl;


    imgly.renderToDataURL("image/jpeg", { size: "1200" }
    , function (err, dataUrl) {
        // `dataUrl` now contains a resized rendered image with// a width of 300 pixels while keeping the ratio// Convert DataURL to Blob to send over Ajax// function dataURItoBlob(dataUrl) {// convert base64 to raw binary data held in a string// doesn't handle URLEncoded DataURIs // - see SO answer #6850276 for code that does this// var byteString = atob(dataUrl.split(',')[1]);// separate out the mime component// var mimeString = dataUrl.split(',')[0].split(':')[1].split(';')[0];// write the bytes of the string to an ArrayBuffer// var ab = new ArrayBuffer(byteString.length);// var ia = new Uint8Array(ab);// for (var i = 0; i < byteString.length; i++) {//    ia[i] = byteString.charCodeAt(i);// }// write the ArrayBuffer to a blob, and you're done// var bb = new BlobBuilder();// bb.append(ab);// return bb.getBlob(mimeString);// }var _data = dataUrl.split(/,/)[1];
    // var fd = new FormData(document.forms[0]);var xhr = newXMLHttpRequest();
        functionsuccess(response) {
            if (response.target.readyState === 4) {
                var data = JSON.parse(response.target.response);
                var image = "data:" + data.type + ";base64," + data.file;
                console.log(image); // `data URI` of resized image
            }
        }
        xhr.onload = success;
    // fd.append("myFile", blob);
    xhr.open("POST", "/echo/json/", true);
    xhr.send("json=" + encodeURIComponent(
                           JSON.stringify({"file": _data,"type":blob.type})
                       )
    );

See also Handling_the_upload_process_for_a_file