Show spinner using delayed css animation in richtext preview

[rails.git] / app / assets / javascripts / richtext.js

diff --git a/app/assets/javascripts/richtext.js b/app/assets/javascripts/richtext.js
index 0ff25bc0a2a5b788020df235928ccb7394266082..bd00d937e2313068b310681a2be733f04dff0201 100644 (file)
--- a/app/assets/javascripts/richtext.js
+++ b/app/assets/javascripts/richtext.js
@@ -1,39 +1,61 @@
-$(document).ready(function () {
+(function () {
   /*
    * When the text in an edit pane is changed, clear the contents of
    * the associated preview pne so that it will be regenerated when
    * the user next switches to it.
    */
-  $(".richtext_container textarea").change(function () {
+  $(document).on("change", ".richtext_container textarea", function () {
     var container = $(this).closest(".richtext_container");
+    var preview = container.find(".tab-pane[id$='_preview']");
 
-    container.find(".tab-pane[id$='_preview']").empty();
+    preview.children(".richtext_placeholder").attr("hidden", true).removeClass("delayed-fade-in");
+    preview.children(".richtext").empty();
   });
 
   /*
-   * Install a handler to switch to preview mode
+   * Install a handler to set the minimum preview pane height
+   * when switching away from an edit pane
    */
-  $(".richtext_container button[data-bs-target$='_preview']").on("show.bs.tab", function () {
+  $(document).on("hide.bs.tab", ".richtext_container button[data-bs-target$='_edit']", function () {
     var container = $(this).closest(".richtext_container");
     var editor = container.find("textarea");
     var preview = container.find(".tab-pane[id$='_preview']");
     var minHeight = editor.outerHeight() - preview.outerHeight() + preview.height();
 
-    if (preview.contents().length === 0) {
-      preview.oneTime(500, "loading", function () {
-        preview.addClass("loading");
-      });
+    preview.css("min-height", minHeight + "px");
+  });
+
+  /*
+   * Install a handler to switch to preview mode
+   */
+  $(document).on("show.bs.tab", ".richtext_container button[data-bs-target$='_preview']", function () {
+    var container = $(this).closest(".richtext_container");
+    var editor = container.find("textarea");
+    var preview = container.find(".tab-pane[id$='_preview']");
+
+    if (preview.children(".richtext").contents().length === 0) {
+      preview.children(".richtext_placeholder").removeAttr("hidden").addClass("delayed-fade-in");
 
-      preview.load(editor.data("previewUrl"), { text: editor.val() }, function () {
-        preview.stopTime("loading");
-        preview.removeClass("loading");
+      preview.children(".richtext").load(editor.data("previewUrl"), { text: editor.val() }, function () {
+        preview.children(".richtext_placeholder").attr("hidden", true).removeClass("delayed-fade-in");
       });
     }
+  });
 
-    preview.css("min-height", minHeight + "px");
+  $(window).on("resize", updateHelp);
+
+  $(document).on("turbo:load", function () {
+    $(".richtext_container textarea").on("invalid", invalidTextareaListener);
+    updateHelp();
   });
 
-  var updateHelp = function () {
+  function invalidTextareaListener() {
+    var container = $(this).closest(".richtext_container");
+
+    container.find("button[data-bs-target$='_edit']").tab("show");
+  }
+
+  function updateHelp() {
     $(".richtext_container .richtext_help_sidebar:not(:visible):not(:empty)").each(function () {
       var container = $(this).closest(".richtext_container");
       $(this).children().appendTo(container.find(".tab-pane[id$='_help']"));
@@ -45,8 +67,5 @@ $(document).ready(function () {
         container.find("button[data-bs-target$='_edit']").tab("show");
       }
     });
-  };
-
-  updateHelp();
-  $(window).on("resize", updateHelp);
-});
+  }
+}());