Scan Barcodes for Project Cure

scan-barcode.js

var searchInput = document.getElementById("SearchBox");
var scanInput = document.createElement("input");
scanInput.type = "file";
scanInput.accept = "image/*";
scanInput.addEventListener("change", onFileChange);
searchInput.parentElement.insertBefore(scanInput, searchInput);


function onFileChange() {
  readImageData(scanInput.files[0], function(error, imageData) {
    if(error) return console.error(error);

    findBarcode(imageData, function(error, barcode) {
      if(error) return console.error(error);

      searchInput.value = barcode.code;
      searchInput.form.submit();
    });
  })
}

function readImageData(file, callback) {
  var reader = new FileReader();
  
  reader.addEventListener("load", function () {
    callback(null, reader.result);
  }, false);

  if (file) {
    reader.readAsDataURL(file);
  }
}

function findBarcode(imageData, callback) {
  Quagga.decodeSingle({
    decoder: {
        readers: ["code_128_reader"] // List of active readers, may need additions
    },
    locate: true,
    src: imageData
  }, function(result){
    if(result.codeResult) {
      callback(null, result.codeResult);
    } else {
      callback("Found no bar code!")
    }
  });
}