on branch deletion show loading icon and disabled the button

after user click delete branch, there is no processing indication, and user can click many times till. It seems flaw in UX. this will fix it

fix bug in branch deletion link

6 files changed, 103 insertions, 1 deletions

diff --git a/app/assets/javascripts/ajax_loading_spinner.js b/app/assets/javascripts/ajax_loading_spinner.js
new file mode 100644
index 00000000000..38a8317dbd7
--- /dev/null
+++ b/app/assets/javascripts/ajax_loading_spinner.js
@@ -0,0 +1,35 @@
+class AjaxLoadingSpinner {
+  static init() {
+    const $elements = $('.js-ajax-loading-spinner');
+
+    $elements.on('ajax:beforeSend', AjaxLoadingSpinner.ajaxBeforeSend);
+    $elements.on('ajax:complete', AjaxLoadingSpinner.ajaxComplete);
+  }
+
+  static ajaxBeforeSend(e) {
+    e.target.setAttribute('disabled', '');
+    const iconElement = e.target.querySelector('i');
+    // get first fa- icon
+    const originalIcon = iconElement.className.match(/(fa-)([^\s]+)/g).first();
+    iconElement.dataset.icon = originalIcon;
+    AjaxLoadingSpinner.toggleLoadingIcon(iconElement);
+    $(e.target).off('ajax:beforeSend', AjaxLoadingSpinner.ajaxBeforeSend);
+  }
+
+  static ajaxComplete(e) {
+    e.target.removeAttribute('disabled');
+    const iconElement = e.target.querySelector('i');
+    AjaxLoadingSpinner.toggleLoadingIcon(iconElement);
+    $(e.target).off('ajax:complete', AjaxLoadingSpinner.ajaxComplete);
+  }
+
+  static toggleLoadingIcon(iconElement) {
+    const classList = iconElement.classList;
+    classList.toggle(iconElement.dataset.icon);
+    classList.toggle('fa-spinner');
+    classList.toggle('fa-spin');
+  }
+}
+
+window.gl = window.gl || {};
+gl.AjaxLoadingSpinner = AjaxLoadingSpinner;
diff --git a/app/assets/javascripts/dispatcher.js.es6 b/app/assets/javascripts/dispatcher.js.es6
index 45aa6050aed..56610544f63 100644
--- a/app/assets/javascripts/dispatcher.js.es6
+++ b/app/assets/javascripts/dispatcher.js.es6
@@ -108,6 +108,9 @@ const ShortcutsBlob = require('./shortcuts_blob');
         case 'projects:compare:show':
           new gl.Diff();
           break;
+        case 'projects:branches:index':
+          gl.AjaxLoadingSpinner.init();
+          break;
         case 'projects:issues:new':
         case 'projects:issues:edit':
           shortcut_handler = new ShortcutsNavigation();
diff --git a/app/views/projects/branches/_branch.html.haml b/app/views/projects/branches/_branch.html.haml
index 19ffe73a08d..ae63f8184df 100644
--- a/app/views/projects/branches/_branch.html.haml
+++ b/app/views/projects/branches/_branch.html.haml
@@ -31,7 +31,7 @@
 
       - if can?(current_user, :push_code, @project)
         = link_to namespace_project_branch_path(@project.namespace, @project, branch.name),
-          class: "btn btn-remove remove-row #{can_remove_branch?(@project, branch.name) ? '' : 'disabled'}",
+          class: "btn btn-remove remove-row js-ajax-loading-spinner #{can_remove_branch?(@project, branch.name) ? '' : 'disabled'}",
           method: :delete,
           data: { confirm: "Deleting the '#{branch.name}' branch cannot be undone. Are you sure?" },
           remote: true,
diff --git a/changelogs/unreleased/branch_deletion.yml b/changelogs/unreleased/branch_deletion.yml
new file mode 100644
index 00000000000..dbc9265a1fb
--- /dev/null
+++ b/changelogs/unreleased/branch_deletion.yml
@@ -0,0 +1,4 @@
+---
+title: on branch deletion show loading icon and disabled the button
+merge_request: 6761
+author: wendy0402
diff --git a/spec/javascripts/ajax_loading_spinner_spec.js b/spec/javascripts/ajax_loading_spinner_spec.js
new file mode 100644
index 00000000000..a68bccb16f4
--- /dev/null
+++ b/spec/javascripts/ajax_loading_spinner_spec.js
@@ -0,0 +1,58 @@
+require('~/extensions/array');
+require('jquery');
+require('jquery-ujs');
+require('~/ajax_loading_spinner');
+
+describe('Ajax Loading Spinner', () => {
+  const fixtureTemplate = 'static/ajax_loading_spinner.html.raw';
+  preloadFixtures(fixtureTemplate);
+
+  beforeEach(() => {
+    loadFixtures(fixtureTemplate);
+    gl.AjaxLoadingSpinner.init();
+  });
+
+  it('change current icon with spinner icon and disable link while waiting ajax response', (done) => {
+    spyOn(jQuery, 'ajax').and.callFake((req) => {
+      const xhr = new XMLHttpRequest();
+      const ajaxLoadingSpinner = document.querySelector('.js-ajax-loading-spinner');
+      const icon = ajaxLoadingSpinner.querySelector('i');
+
+      req.beforeSend(xhr, { dataType: 'text/html' });
+
+      expect(icon).not.toHaveClass('fa-trash-o');
+      expect(icon).toHaveClass('fa-spinner');
+      expect(icon).toHaveClass('fa-spin');
+      expect(icon.dataset.icon).toEqual('fa-trash-o');
+      expect(ajaxLoadingSpinner.getAttribute('disabled')).toEqual('');
+
+      req.complete({});
+
+      done();
+      const deferred = $.Deferred();
+      return deferred.promise();
+    });
+    document.querySelector('.js-ajax-loading-spinner').click();
+  });
+
+  it('use original icon again and enabled the link after complete the ajax request', (done) => {
+    spyOn(jQuery, 'ajax').and.callFake((req) => {
+      const xhr = new XMLHttpRequest();
+      const ajaxLoadingSpinner = document.querySelector('.js-ajax-loading-spinner');
+
+      req.beforeSend(xhr, { dataType: 'text/html' });
+      req.complete({});
+
+      const icon = ajaxLoadingSpinner.querySelector('i');
+      expect(icon).toHaveClass('fa-trash-o');
+      expect(icon).not.toHaveClass('fa-spinner');
+      expect(icon).not.toHaveClass('fa-spin');
+      expect(ajaxLoadingSpinner.getAttribute('disabled')).toEqual(null);
+
+      done();
+      const deferred = $.Deferred();
+      return deferred.promise();
+    });
+    document.querySelector('.js-ajax-loading-spinner').click();
+  });
+});
diff --git a/spec/javascripts/fixtures/ajax_loading_spinner.html.haml b/spec/javascripts/fixtures/ajax_loading_spinner.html.haml
new file mode 100644
index 00000000000..09d8c9df3b2
--- /dev/null
+++ b/spec/javascripts/fixtures/ajax_loading_spinner.html.haml
@@ -0,0 +1,2 @@
+%a.js-ajax-loading-spinner{href: "http://goesnowhere.nothing/whereami", data: {remote: true}}
+  %i.fa.fa-trash-o