FIX: Jump to post on iOS was broken - replace with prompt

app/assets/javascripts/discourse/components/topic-progress.js.es6

@@ -168,26 +168,8 @@ export default Ember.Component.extend({
     }
   },
 
-  actions: {
+  _jumpTo(postIndex) {
-    toggleExpansion(opts) {
+    postIndex = parseInt(postIndex, 10);
-      this.toggleProperty('expanded');
-      if (this.get('expanded')) {
-        this.set('userWantsToJump', false);
-        this.set('toPostIndex', this.get('progressPosition'));
-        if(opts && opts.highlight){
-          // TODO: somehow move to view?
-          Em.run.next(function(){
-            $('.jump-form input').select().focus();
-          });
-        }
-        if (!this.site.mobileView && !this.capabilities.isIOS) {
-          Ember.run.schedule('afterRender', () => this.$('input').focus());
-        }
-      }
-    },
-
-    jumpPost() {
-      let postIndex = parseInt(this.get('toPostIndex'), 10);
 
     // Validate the post index first
     if (isNaN(postIndex) || postIndex < 1) {
@@ -201,6 +183,31 @@ export default Ember.Component.extend({
     this.sendAction('jumpToIndex', postIndex);
   },
 
+  actions: {
+    toggleExpansion(opts) {
+      this.toggleProperty('expanded');
+      if (this.get('expanded')) {
+        this.set('userWantsToJump', false);
+        this.set('toPostIndex', this.get('progressPosition'));
+        if (opts && opts.highlight) {
+          Ember.run.next(() => $('.jump-form input').select().focus());
+        }
+        if (!this.site.mobileView && !this.capabilities.isIOS) {
+          Ember.run.schedule('afterRender', () => this.$('input').focus());
+        }
+      }
+    },
+
+    jumpPrompt() {
+      const postIndex = prompt(I18n.t('topic.progress.jump_prompt_long'));
+      if (postIndex === null) { return; }
+      this._jumpTo(postIndex);
+    },
+
+    jumpPost() {
+      this._jumpTo(this.get('toPostIndex'));
+    },
+
     jumpTop() {
       this._beforeJump();
       this.sendAction('jumpTop');

app/assets/javascripts/discourse/templates/components/topic-progress.hbs

@@ -6,10 +6,15 @@
                  class="full no-text"
                  icon="caret-up"
                  label="topic.progress.go_top"}}
+      {{#unless capabilities.isIOS}}
         <div class='jump-form'>
           {{input value=toPostIndex}}
           {{d-button action="jumpPost" label="topic.progress.go"}}
         </div>
+      {{else}}
+        {{d-button action="jumpPrompt" class="full jump-prompt" label="topic.progress.jump_prompt"}}
+      {{/unless}}
+
       {{d-button action="jumpBottom"
                  disabled=jumpBottomDisabled
                  class="full no-text jump-bottom"

app/assets/stylesheets/desktop/topic.scss

@@ -133,6 +133,10 @@
       width: 55px;
     }
   }
+  button.btn.jump-prompt {
+    margin: 0;
+  }
+
   button.btn.jump-bottom {
     margin: 5px 0 0 0;
   }

config/locales/client.en.yml

@@ -1349,6 +1349,8 @@ en:
         go_bottom: "bottom"
         go: "go"
         jump_bottom: "jump to last post"
+        jump_prompt: "jump to post"
+        jump_prompt_long: "What post would you like to jump to?"
         jump_bottom_with_number: "jump to post %{post_number}"
         total: total posts
         current: current post