diff -r 07239de796bb -r e756a8c72c3d cms/drupal/modules/file/file.js
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/cms/drupal/modules/file/file.js	Fri Sep 08 12:04:06 2017 +0200
@@ -0,0 +1,155 @@
+/**
+ * @file
+ * Provides JavaScript additions to the managed file field type.
+ *
+ * This file provides progress bar support (if available), popup windows for
+ * file previews, and disabling of other file fields during Ajax uploads (which
+ * prevents separate file fields from accidentally uploading files).
+ */
+
+(function ($) {
+
+/**
+ * Attach behaviors to managed file element upload fields.
+ */
+Drupal.behaviors.fileValidateAutoAttach = {
+  attach: function (context, settings) {
+    if (settings.file && settings.file.elements) {
+      $.each(settings.file.elements, function(selector) {
+        var extensions = settings.file.elements[selector];
+        $(selector, context).bind('change', {extensions: extensions}, Drupal.file.validateExtension);
+      });
+    }
+  },
+  detach: function (context, settings) {
+    if (settings.file && settings.file.elements) {
+      $.each(settings.file.elements, function(selector) {
+        $(selector, context).unbind('change', Drupal.file.validateExtension);
+      });
+    }
+  }
+};
+
+/**
+ * Attach behaviors to the file upload and remove buttons.
+ */
+Drupal.behaviors.fileButtons = {
+  attach: function (context) {
+    $('input.form-submit', context).bind('mousedown', Drupal.file.disableFields);
+    $('div.form-managed-file input.form-submit', context).bind('mousedown', Drupal.file.progressBar);
+  },
+  detach: function (context) {
+    $('input.form-submit', context).unbind('mousedown', Drupal.file.disableFields);
+    $('div.form-managed-file input.form-submit', context).unbind('mousedown', Drupal.file.progressBar);
+  }
+};
+
+/**
+ * Attach behaviors to links within managed file elements.
+ */
+Drupal.behaviors.filePreviewLinks = {
+  attach: function (context) {
+    $('div.form-managed-file .file a, .file-widget .file a', context).bind('click',Drupal.file.openInNewWindow);
+  },
+  detach: function (context){
+    $('div.form-managed-file .file a, .file-widget .file a', context).unbind('click', Drupal.file.openInNewWindow);
+  }
+};
+
+/**
+ * File upload utility functions.
+ */
+Drupal.file = Drupal.file || {
+  /**
+   * Client-side file input validation of file extensions.
+   */
+  validateExtension: function (event) {
+    // Remove any previous errors.
+    $('.file-upload-js-error').remove();
+
+    // Add client side validation for the input[type=file].
+    var extensionPattern = event.data.extensions.replace(/,\s*/g, '|');
+    if (extensionPattern.length > 1 && this.value.length > 0) {
+      var acceptableMatch = new RegExp('\\.(' + extensionPattern + ')$', 'gi');
+      if (!acceptableMatch.test(this.value)) {
+        var error = Drupal.t("The selected file %filename cannot be uploaded. Only files with the following extensions are allowed: %extensions.", {
+          // According to the specifications of HTML5, a file upload control
+          // should not reveal the real local path to the file that a user
+          // has selected. Some web browsers implement this restriction by
+          // replacing the local path with "C:\fakepath\", which can cause
+          // confusion by leaving the user thinking perhaps Drupal could not
+          // find the file because it messed up the file path. To avoid this
+          // confusion, therefore, we strip out the bogus fakepath string.
+          '%filename': this.value.replace('C:\\fakepath\\', ''),
+          '%extensions': extensionPattern.replace(/\|/g, ', ')
+        });
+        $(this).closest('div.form-managed-file').prepend('<div class="messages error file-upload-js-error" aria-live="polite">' + error + '</div>');
+        this.value = '';
+        return false;
+      }
+    }
+  },
+  /**
+   * Prevent file uploads when using buttons not intended to upload.
+   */
+  disableFields: function (event){
+    var clickedButton = this;
+
+    // Only disable upload fields for Ajax buttons.
+    if (!$(clickedButton).hasClass('ajax-processed')) {
+      return;
+    }
+
+    // Check if we're working with an "Upload" button.
+    var $enabledFields = [];
+    if ($(this).closest('div.form-managed-file').length > 0) {
+      $enabledFields = $(this).closest('div.form-managed-file').find('input.form-file');
+    }
+
+    // Temporarily disable upload fields other than the one we're currently
+    // working with. Filter out fields that are already disabled so that they
+    // do not get enabled when we re-enable these fields at the end of behavior
+    // processing. Re-enable in a setTimeout set to a relatively short amount
+    // of time (1 second). All the other mousedown handlers (like Drupal's Ajax
+    // behaviors) are excuted before any timeout functions are called, so we
+    // don't have to worry about the fields being re-enabled too soon.
+    // @todo If the previous sentence is true, why not set the timeout to 0?
+    var $fieldsToTemporarilyDisable = $('div.form-managed-file input.form-file').not($enabledFields).not(':disabled');
+    $fieldsToTemporarilyDisable.attr('disabled', 'disabled');
+    setTimeout(function (){
+      $fieldsToTemporarilyDisable.attr('disabled', false);
+    }, 1000);
+  },
+  /**
+   * Add progress bar support if possible.
+   */
+  progressBar: function (event) {
+    var clickedButton = this;
+    var $progressId = $(clickedButton).closest('div.form-managed-file').find('input.file-progress');
+    if ($progressId.length) {
+      var originalName = $progressId.attr('name');
+
+      // Replace the name with the required identifier.
+      $progressId.attr('name', originalName.match(/APC_UPLOAD_PROGRESS|UPLOAD_IDENTIFIER/)[0]);
+
+      // Restore the original name after the upload begins.
+      setTimeout(function () {
+        $progressId.attr('name', originalName);
+      }, 1000);
+    }
+    // Show the progress bar if the upload takes longer than half a second.
+    setTimeout(function () {
+      $(clickedButton).closest('div.form-managed-file').find('div.ajax-progress-bar').slideDown();
+    }, 500);
+  },
+  /**
+   * Open links to files within forms in a new window.
+   */
+  openInNewWindow: function (event) {
+    $(this).attr('target', '_blank');
+    window.open(this.href, 'filePreview', 'toolbar=0,scrollbars=1,location=1,statusbar=1,menubar=0,resizable=1,width=500,height=550');
+    return false;
+  }
+};
+
+})(jQuery);