application.js

// This is a manifest file that'll be compiled into application.js, which will include all the files
// listed below.
//
// Any JavaScript file within this directory, lib/assets/javascripts, vendor/assets/javascripts,
// or any plugin's vendor/assets/javascripts directory can be referenced here using a relative path.
//
// It's not advisable to add code directly here, but if you do, it'll appear at the bottom of the
// compiled file. JavaScript code in this file should be added after the last require_* statement.
//
// Read Sprockets README (https://github.com/rails/sprockets#sprockets-directives) for details
// about supported directives.
//
//= require rails-ujs
//= require jquery
//= require popper
//= require bootstrap
//= require bootstrap-select
// require jquery_ujs
//= require filterrific/filterrific-jquery
//= require bootstrap/alert
//= require adminlte.min
//= require cocoon
//= require quagga
//= require_tree .

window.setTimeout(function() {
  // When the user is given an error message, we should not auto-hide it so that
  // they can fully read it and potentially copy/paste it into an issue.
  $(".alert").not(".error").fadeTo(1000, 0).slideUp(1000, function() {
    $(this).remove();
  });
}, 2500);

$(document).ready(function() {
  Filterrific.init();
});

function order_by_occurrence(arr) {
  var counts = {};
  arr.forEach(function (value) {
    if (!counts[value]) {
      counts[value] = 0;
    }
    counts[value]++;
  });

  return Object.keys(counts).sort(function (curKey, nextKey) {
    return counts[curKey] < counts[nextKey];
  });
}

function load_quagga() {
  if ($('#barcode-scanner').length > 0 && navigator.mediaDevices && typeof navigator.mediaDevices.getUserMedia === 'function') {

    var last_result = [];
    if (Quagga.initialized == undefined) {
      Quagga.onDetected(function (result) {
        var last_code = result.codeResult.code;
        last_result.push(last_code);
        if (last_result.length > 20) {
          code = order_by_occurrence(last_result)[0];
          last_result = [];
          Quagga.stop();
          $.ajax({
            type: "POST",
            url: '/products/get_barcode',
            data: { upc: code }
          });
        }
      });
    }

    Quagga.init({
      inputStream: {
        name: "Live",
        type: "LiveStream",
        numOfWorkers: navigator.hardwareConcurrency,
        target: document.querySelector('#barcode-scanner')
      },
      decoder: {
        readers: ['ean_reader', 'ean_8_reader', 'code_39_reader', 'code_39_vin_reader', 'codabar_reader', 'upc_reader', 'upc_e_reader']
      }
    }, function (err) {
      if (err) { console.log(err); return }
      Quagga.initialized = true;
      Quagga.start();
    });

  }
};
$(document).on('turbolinks:load', load_quagga);

/**
 * Handle loading on specified tab in the URL parameter. In case we would like
 * to direct a user to a specific tab on a page rather than the default.
 */

$(document).ready(function () {
  var hash = location.hash.replace(/^#/, '');  // ^ means starting, meaning only match the first hash
  if (hash) {
    $('.nav-tabs a[href="#' + hash + '"]').tab('show');
  }

  // Change hash for page-reload
  $('.nav-tabs a').on('shown.bs.tab', function (e) {
    window.location.hash = e.target.hash;
  })
})