From 415b032ba1d003bb407581ce3069c95ac178bfd4 Mon Sep 17 00:00:00 2001
From: Fatih Acet <acetfatih@gmail.com>
Date: Wed, 15 Jun 2016 00:15:46 +0300
Subject: Prevent default disabled buttons and links.

---
 CHANGELOG                                         |  1 +
 app/assets/javascripts/application.js.coffee      |  1 +
 app/assets/javascripts/lib/common_utils.js.coffee |  7 ++++++
 spec/javascripts/application_spec.js.coffee       | 30 +++++++++++++++++++++++
 spec/javascripts/fixtures/application.html.haml   |  2 ++
 5 files changed, 41 insertions(+)
 create mode 100644 spec/javascripts/application_spec.js.coffee
 create mode 100644 spec/javascripts/fixtures/application.html.haml

diff --git a/CHANGELOG b/CHANGELOG
index a215d794670..bb5bde9b08b 100644
--- a/CHANGELOG
+++ b/CHANGELOG
@@ -77,6 +77,7 @@ v 8.9.0 (unreleased)
   - RepositoryCheck::SingleRepositoryWorker public and private methods are now instrumented
   - Improve issuables APIs performance when accessing notes !4471
   - External links now open in a new tab
+  - Prevent default actions of disabled buttons and links
   - Markdown editor now correctly resets the input value on edit cancellation !4175
   - Toggling a task list item in a issue/mr description does not creates a Todo for mentions
   - Improved UX of date pickers on issue & milestone forms
diff --git a/app/assets/javascripts/application.js.coffee b/app/assets/javascripts/application.js.coffee
index 69d4c4f5dd3..6c16f89cef6 100644
--- a/app/assets/javascripts/application.js.coffee
+++ b/app/assets/javascripts/application.js.coffee
@@ -125,6 +125,7 @@ window.onload = ->
     setTimeout shiftWindow, 100
 
 $ ->
+  gl.utils.preventDisabledButtons()
   bootstrapBreakpoint = bp.getBreakpointSize()
 
   $(".nicescroll").niceScroll(cursoropacitymax: '0.4', cursorcolor: '#FFF', cursorborder: "1px solid #FFF")
diff --git a/app/assets/javascripts/lib/common_utils.js.coffee b/app/assets/javascripts/lib/common_utils.js.coffee
index 5e3a802f45f..4f1779b8483 100644
--- a/app/assets/javascripts/lib/common_utils.js.coffee
+++ b/app/assets/javascripts/lib/common_utils.js.coffee
@@ -32,5 +32,12 @@
       .attr    'title', newTitle
       .tooltip 'fixTitle'
 
+  gl.utils.preventDisabledButtons = ->
+
+    $('.btn').click (e) ->
+      if $(this).hasClass 'disabled'
+        e.preventDefault()
+        e.stopImmediatePropagation()
+        return false
 
 ) window
diff --git a/spec/javascripts/application_spec.js.coffee b/spec/javascripts/application_spec.js.coffee
new file mode 100644
index 00000000000..8af39c41f2f
--- /dev/null
+++ b/spec/javascripts/application_spec.js.coffee
@@ -0,0 +1,30 @@
+#= require lib/common_utils
+
+describe 'Application', ->
+  describe 'disable buttons', ->
+    fixture.preload('application.html')
+
+    beforeEach ->
+      fixture.load('application.html')
+
+    it 'should prevent default action for disabled buttons', ->
+
+      gl.utils.preventDisabledButtons()
+
+      isClicked = false
+      $button   = $ '#test-button'
+
+      $button.click -> isClicked = true
+      $button.trigger 'click'
+
+      expect(isClicked).toBe false
+
+
+    it 'should be on the same page if a disabled link clicked', ->
+
+      locationBeforeLinkClick = window.location.href
+      gl.utils.preventDisabledButtons()
+
+      $('#test-link').click()
+
+      expect(window.location.href).toBe locationBeforeLinkClick
diff --git a/spec/javascripts/fixtures/application.html.haml b/spec/javascripts/fixtures/application.html.haml
new file mode 100644
index 00000000000..3fc6114407d
--- /dev/null
+++ b/spec/javascripts/fixtures/application.html.haml
@@ -0,0 +1,2 @@
+%a#test-link.btn.disabled{:href => "/foo"} Test link
+%button#test-button.btn.disabled Test Button
-- 
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