uploads: Fix the upload progress bar.

There was already a progress bar set up, but it became non-functional
after refactoring.  This fixes it.

The default animation was getting cut off when `uploadFinished` is
called, so we add a delay before removing the upload bar to make it
get to the end.

Tweaked by tabbott to have a more natural feeling animation setup
(where we don't animate the width adjustments; just the disappearance
of the bar).

Fixes #8863.

frontend_tests/node_tests/upload.js

@@ -33,11 +33,10 @@ var upload_opts = upload.options({ mode: "compose" });
     };
     $("#compose-error-msg").html('');
     var test_html = '<div class="progress progress-striped active">' +
-                    '<div class="bar" id="compose-upload-bar" style="width: 00%;">' +
-                    '</div></div>';
-    $("<p>").after = function (html) {
+                    '<div class="bar" id="compose-upload-bar" style="width: 00%;"></div>' +
+                    '</div>';
+    $("#compose-send-status").append = function (html) {
         assert.equal(html, test_html);
-        return 'fake-html';
     };
 
     upload_opts.drop();
@@ -46,7 +45,6 @@ var upload_opts = upload.options({ mode: "compose" });
     assert($("#compose-send-status").hasClass("alert-info"));
     assert($("#compose-send-status").visible());
     assert.equal($("<p>").text(), 'translated: Uploading…');
-    assert.equal($("#compose-error-msg").html(), 'fake-html');
 }());
 
 (function test_progress_updated() {
@@ -65,6 +63,10 @@ var upload_opts = upload.options({ mode: "compose" });
         $("#compose-send-status").addClass("alert-info");
         $("#compose-send-button").attr("disabled", 'disabled');
         $("#compose-error-msg").text('');
+
+        $("#compose-upload-bar").parent = function () {
+            return { remove: function () {} };
+        };
     }
 
     function assert_side_effects(msg) {
@@ -144,8 +146,17 @@ var upload_opts = upload.options({ mode: "compose" });
             }
         }
 
+        global.patch_builtin('setTimeout', function (func) {
+            func();
+        });
+
+        $("#compose-upload-bar").width = function (width_percent) {
+            assert.equal(width_percent, '100%');
+        };
+
         setup();
         upload_opts.uploadFinished(i, {}, response);
+        upload_opts.progressUpdated(1, '', 100);
         assert_side_effects();
     }
 

static/js/upload.js

@@ -24,6 +24,7 @@ exports.options = function (config) {
     var send_status_close;
     var error_msg;
     var upload_bar;
+    var should_hide_upload_status;
     var file_input;
 
     switch (config.mode) {
@@ -49,18 +50,38 @@ exports.options = function (config) {
         throw Error("Invalid upload mode!");
     }
 
+    var maybe_hide_upload_status = function () {
+        // The first time `maybe_hide_upload_status`, it will not hide the
+        // status; the second time it will. This guarantees that whether
+        // `progressUpdated` or `uploadFinished` is called first, the status
+        // is hidden only after the animation is finished.
+        if (should_hide_upload_status) {
+            setTimeout(function () {
+                send_button.prop("disabled", false);
+                send_status.removeClass("alert-info").hide();
+                $("#" + upload_bar).parent().remove();
+            }, 500);
+        } else {
+            should_hide_upload_status = true;
+        }
+    };
+
     var uploadStarted = function () {
         send_button.attr("disabled", "");
         send_status.addClass("alert-info").show();
         send_status_close.one('click', compose.abort_xhr);
-        error_msg.html($("<p>").text(i18n.t("Uploading…"))
-            .after('<div class="progress progress-striped active">' +
+        error_msg.html($("<p>").text(i18n.t("Uploading…")));
+        send_status.append('<div class="progress progress-striped active">' +
                            '<div class="bar" id="' + upload_bar + '" style="width: 00%;"></div>' +
-                   '</div>'));
+                           '</div>');
+        should_hide_upload_status = false;
     };
 
     var progressUpdated = function (i, file, progress) {
         $("#" + upload_bar).width(progress + "%");
+        if (progress === 100) {
+            maybe_hide_upload_status();
+        }
     };
 
     var uploadError = function (error_code, server_response, file) {
@@ -68,6 +89,7 @@ exports.options = function (config) {
         send_status.addClass("alert-error")
             .removeClass("alert-info");
         send_button.prop("disabled", false);
+        $("#" + upload_bar).parent().remove();
         switch (error_code) {
         case 'BrowserNotSupported':
             msg = i18n.t("File upload is not yet available for your browser.");
@@ -120,8 +142,8 @@ exports.options = function (config) {
             compose_ui.insert_syntax_and_focus(filename_uri, textarea);
         }
         compose_ui.autosize_textarea();
-        send_button.prop("disabled", false);
-        send_status.removeClass("alert-info").hide();
+
+        maybe_hide_upload_status();
 
         // In order to upload the same file twice in a row, we need to clear out
         // the file input element, so that the next time we use the file dialog,