Added eventHub events to change the showForm value

app/assets/javascripts/issue_show/index.js

 import Vue from 'vue';
+import eventHub from './event_hub';
 import issuableApp from './components/app.vue';
 import '../vue_shared/vue_resource_interceptor';
 
-document.addEventListener('DOMContentLoaded', () => new Vue({
+document.addEventListener('DOMContentLoaded', () => {
+  $('.issuable-edit').on('click', (e) => {
+    e.preventDefault();
+
+    eventHub.$emit('open.form');
+  });
+
+  return new Vue({
     el: document.getElementById('js-issuable-app'),
     components: {
       issuableApp,
@@ -25,8 +33,21 @@ document.addEventListener('DOMContentLoaded', () => new Vue({
         initialTitle: issuableTitleElement.innerHTML,
         initialDescriptionHtml: issuableDescriptionElement ? issuableDescriptionElement.innerHTML : '',
         initialDescriptionText: issuableDescriptionTextarea ? issuableDescriptionTextarea.textContent : '',
+        showForm: false,
       };
     },
+    methods: {
+      openForm() {
+        this.showForm = true;
+        console.log(this.showForm);
+      },
+    },
+    created() {
+      eventHub.$on('open.form', this.openForm);
+    },
+    beforeDestroy() {
+      eventHub.$off('open.form', this.openForm);
+    },
     render(createElement) {
       return createElement('issuable-app', {
         props: {
@@ -39,4 +60,5 @@ document.addEventListener('DOMContentLoaded', () => new Vue({
         },
       });
     },
-}));
+  });
+});

app/views/projects/issues/show.html.haml

@@ -35,7 +35,7 @@
             %li
               = link_to 'Close issue', issue_path(@issue, issue: { state_event: :close }, format: 'json'), data: {no_turbolink: true}, class: "btn-close #{issue_button_visibility(@issue, true)}", title: 'Close issue'
             %li
-              = link_to 'Edit', edit_namespace_project_issue_path(@project.namespace, @project, @issue)
+              = link_to 'Edit', edit_namespace_project_issue_path(@project.namespace, @project, @issue), class: 'issuable-edit'
           - if @issue.submittable_as_spam_by?(current_user)
             %li
               = link_to 'Submit as spam', mark_as_spam_namespace_project_issue_path(@project.namespace, @project, @issue), method: :post, class: 'btn-spam', title: 'Submit as spam'