Move all layout files to a "v1" directory.

public/v1/js/ff/export/.htaccess

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+Options -Indexes

public/v1/js/ff/export/index.js

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+/*
+ * index.js
+ * Copyright (c) 2017 thegrumpydictator@gmail.com
+ *
+ * This file is part of Firefly III.
+ *
+ * Firefly III is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * Firefly III is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with Firefly III. If not, see <http://www.gnu.org/licenses/>.
+ */
+
+/** global: jobKey, Modernizr */
+
+var intervalId = 0;
+
+$(function () {
+      "use strict";
+      // on click of export button:
+      // - hide form
+      // - post export command
+      // - start polling progress.
+      // - return false,
+
+      $('#export').submit(startExport);
+
+      if (!Modernizr.inputtypes.date) {
+          $('input[type="date"]').datepicker(
+              {
+                  dateFormat: 'yy-mm-dd'
+              }
+          );
+      }
+  }
+);
+
+function startExport() {
+    "use strict";
+    hideForm();
+    showLoading();
+    hideError();
+
+    // do export
+    callExport();
+
+    return false;
+}
+
+function hideError() {
+    "use strict";
+    $('#export-error').hide();
+}
+
+function hideForm() {
+    "use strict";
+    $('#form-body').hide();
+    $('#do-export-button').hide();
+}
+
+function showForm() {
+    "use strict";
+    $('#form-body').show();
+    $('#do-export-button').show().prop('disabled', false);
+    // enable button again:
+}
+
+function showLoading() {
+    "use strict";
+    $('#export-loading').show();
+}
+
+function hideLoading() {
+    "use strict";
+    $('#export-loading').hide();
+}
+
+function showDownload() {
+    "use strict";
+    $('#export-download').show();
+}
+
+function showError(text) {
+    "use strict";
+    $('#export-error').show().find('p').text(text);
+}
+
+function callExport() {
+    "use strict";
+    var data = $('#export').serialize();
+
+    // call status, keep calling it until response is "finished"?
+    intervalId = window.setInterval(checkStatus, 500);
+
+    $.post('export/submit', data, null, 'json').done(function () {
+        // stop polling:
+        window.clearTimeout(intervalId);
+
+        // call it one last time:
+        window.setTimeout(checkStatus, 500);
+
+        // somewhere here is a download link.
+
+        // keep the loading thing, for debug.
+        hideLoading();
+
+        // show download
+        showDownload();
+
+    }).fail(function (jqXHR) {
+        // show error.
+        // show form again.
+        var response = jqXHR.responseJSON;
+        var errorText = 'The export failed. Please check the log files to find out why.';
+        if (typeof response === 'object') {
+            errorText = response.message;
+        }
+
+        showError(errorText);
+
+
+        // stop polling:
+        window.clearTimeout(intervalId);
+
+        hideLoading();
+        showForm();
+
+    });
+}
+
+function checkStatus() {
+    "use strict";
+    $.getJSON('export/status/' + jobKey).done(function (data) {
+        putStatusText(data.status);
+    });
+}
+
+function putStatusText(status) {
+    "use strict";
+    $('#status-message').text(status);
+}