demo.js

window.onload = function() {
  var sequencer = ImageSequencer();

  function refreshOptions() {
    // Load information of all modules (Name, Inputs, Outputs)
    var modulesInfo = sequencer.modulesInfo();

    var addStepSelect = $("#addStep select");
    addStepSelect.html("");

    // Add modules to the addStep dropdown
    for (var m in modulesInfo) {
      addStepSelect.append(
        '<option value="' + m + '">' + modulesInfo[m].name + "</option>"
      );
    }
    // Null option
    addStepSelect.append('<option value="none" disabled selected>More modules...</option>');
  }
  refreshOptions();

  // UI for each step:
  sequencer.setUI(DefaultHtmlStepUi(sequencer));

  // UI for the overall demo:
  var ui = DefaultHtmlSequencerUi(sequencer);

  // find any `src` parameters in URL hash and attempt to source image from them and run the sequencer
  imageSource = "images/tulips.png";
  if (getUrlHashParameter('src')) {
    imageSource = getUrlHashParameter('src');
  }
  sequencer.loadImage(imageSource, ui.onLoad);

  //Inserting previews
  function generatePreview(element, source, filter, steps) {
    function insertImage(src) {
      var img = document.createElement('img');
      img.src = src;
      $(element).append(img); // maybe append img to the element passed in as a parameter?
    }
    var previewSequencer = new ImageSequencer();
    previewSequencer.loadImage(source).addSteps(filter + "," + steps).run(insertImage);
  }
  generatePreview("#saturation", imageSource, "resize:{x: 100, y: 100}", 1);

  //Module button radio selection
  $('.radio-group .radio').on("click", function(){
    $(this).parent().find('.radio').removeClass('selected');
    $(this).addClass('selected');
    newStep = $(this).attr('data-value');
    console.log(newStep);
    //$("#addStep option[value=" + newStep + "]").attr('selected', 'selected');
    $("#addStep select").val(newStep);
    ui.selectNewStepUi();
    ui.addStepUi();
    $(this).removeClass('selected');
  });

  $("#addStep select").on("change", ui.selectNewStepUi);
  $("#addStep #add-step-btn").on("click", ui.addStepUi);
  $('#addStep #download-btn').click(function() {
    $('img:last()').trigger("click");

    return false;
  });
  $('body').on('click', 'button.remove', ui.removeStepUi);
  $('#save-seq').click(() => {
    sequencer.saveSequence(window.prompt("Please give a name to your sequence..."), sequencer.toString());
    sequencer.loadModules();
    refreshOptions();
  });

  var isWorkingOnGifGeneration = false;

  $('.js-view-as-gif').on('click', function(event) {
    // Prevent user from triggering generation multiple times
    if (isWorkingOnGifGeneration) return;

    isWorkingOnGifGeneration = true;

    var button = event.target;
    button.disabled = true;


    try {
      // Select all images from previous steps
      var imgs = document.getElementsByClassName("img-thumbnail");

      var imgSrcs = [];

      for (var i = 0; i < imgs.length; i++) {
        imgSrcs.push(imgs[i].src);
      }

      var options = {
        'gifWidth': imgs[0].width,
        'gifHeight': imgs[0].height,
        'images': imgSrcs,
        'frameDuration': 7,
      }

      gifshot.createGIF(options, function(obj) {
        if(!obj.error) {
          // Final gif encoded with base64 format
          var image = obj.image;
          var animatedImage = document.createElement('img');

          animatedImage.id = "gif_element";
          animatedImage.src = image;


          var modal = $('#js-download-gif-modal');

          $("#js-download-as-gif-button").one("click", function() {
            // Trigger download
            download(image, "index.gif", "image/gif");

            // Close modal
            modal.modal('hide');
          })

          var gifContainer = document.getElementById("js-download-modal-gif-container");

          // Clear previous results
          gifContainer.innerHTML = '';

          // Insert image
          gifContainer.appendChild(animatedImage);


          // Open modal
          modal.modal();

          button.disabled = false;
          isWorkingOnGifGeneration = false;
        }
      });
    }
    catch(e) {
      console.error(e);
      button.disabled = false;
      isWorkingOnGifGeneration = false;

    }
  });

  // image selection and drag/drop handling from examples/lib/imageSelection.js
  sequencer.setInputStep({
    dropZoneSelector: "#dropzone",
    fileInputSelector: "#fileInput",
    onLoad: function onFileReaderLoad(progress) {
      var reader = progress.target;
      var step = sequencer.images.image1.steps[0];
      step.output.src = reader.result;
      sequencer.run({ index: 0 });
      step.options.step.imgElement.src = reader.result;
    }
  });

  if ('serviceWorker' in navigator) {
    navigator.serviceWorker.register('sw.js', { scope: '/examples/' })
      .then(function(registration) {
        const installingWorker = registration.installing;
        installingWorker.onstatechange = () => {
          console.log(installingWorker)
          if (installingWorker.state === 'installed') {
            location.reload();
          }
        }
        console.log('Registration successful, scope is:', registration.scope);
      })
      .catch(function(error) {
        console.log('Service worker registration failed, error:', error);
      });
  }

  if ('serviceWorker' in navigator) {
        caches.keys().then(function(cacheNames) {
          cacheNames.forEach(function(cacheName) {
            $("#clear-cache").append(" " + cacheName);
          });
        });
      }

  $("#clear-cache").click(function() {
      if ('serviceWorker' in navigator) {
        caches.keys().then(function(cacheNames) {
          cacheNames.forEach(function(cacheName) {
            caches.delete(cacheName);
          });
        });
      }
  location.reload();
  });
};