Resolving issue 140

app/concepts/matestack/ui/core/async/async.js

@@ -58,6 +58,9 @@ const componentDef = {
         }
       }
     }
+    if(this.componentConfig["init_show"] == true){
+      this.showing = true
+    }
   },
   beforeDestroy: function() {
     const self = this

docs/components/async.md

@@ -26,13 +26,13 @@ end
 
 **Note:** The `rerender_on` option lets you rerender parts of your UI asynchronously, which is cool. But please consider that, if not configured differently, it a) is **not** _lazily loaded_ and b) does get displayed on initial pageload.
 
-Lazy (or defered) loading is a feature we're working on right now, for details see [here](https://github.com/basemate/matestack-ui-core/issues/58).
+Lazy (or defered) loading can be configured like shown  [here](#defer).
 
-If you want to hide the async component on initial pageload and display it later on, read below as this option (`show_on`) is already implemented (and can be combined with `rerender_on`)!
+If you want to simply hide the async component on initial pageload and display it later on, read below how to use `show_on`, which can be combined with `rerender_on`.
 
 ### Show_on
 
-The `show_on` option lets us define an event on which the component gets shown.
+The `show_on` option lets us define an event on which the component gets shown. The content is still rendered on init pageload, but simply hidden in the browser until the event is emitted. If you want to have proper deferred loading, please refer to [defer](#defer)
 
 ```ruby
 async show_on: 'my_event' do
@@ -66,6 +66,30 @@ async hide_after: 1000 do
 end
 ```
 
+### Shown_on/Hide_on Combination
+
+If you combine `shown_on` and `hide_on`, you can toggel the view state of the `async` component explicitly.
+
+By default, the content is initially hidden until the show event is emitted when `shown_on` is applied.
+
+```ruby
+async shown_on: "my_show_event", hide_on: 'my_hide_event' do
+  div id: 'my-div' do
+    plain 'You will not see me after the event'
+  end
+end
+```
+
+ If you want to display the content initially, simply add `init_show: true`
+
+```ruby
+async shown_on: "my_show_event", hide_on: 'my_hide_event', init_show: true do
+  div id: 'my-div' do
+    plain 'You will not see me after the event'
+  end
+end
+```
+
 ### Defer
 
 The `defer` option may be used in two ways:
@@ -203,6 +227,69 @@ end
 
 As expected, the timestamp is only visible _before_ our event was fired and is hidden/invisible _after_ the event!
 
+### Example 3.1: Rerender/Show/Hide Combination for inline editing
+
+Imagine, you want to create an inline edit form. Using a combination of `show_on`, `hide_on`, `init_show:true` and `rerender_on` allows you to implement this easily like shown below:
+
+
+```ruby
+class ExamplePage < Matestack::Ui::Page
+
+  def prepare
+    @my_model = MyModel.find(42)
+  end
+
+  def response
+    components {
+      partial :show_value
+      partial :show_form
+    }
+  end
+
+  def show_value
+    partial {
+      async rerender_on: "item_updated", show_on: "item_updated", hide_on: "update_item", init_show: true do
+        onclick emit: "update_item" do
+          plain @my_model.title
+        end
+      end
+    }
+  end
+
+  def show_form
+    partial {
+      async rerender_on: "item_updated", show_on: "update_item", hide_on: "item_updated" do
+        form some_form_config, :include do
+          form_input key: :title, type: :text
+          form_submit do
+            button text: "save"
+          end
+        end
+        onclick emit: "item_updated" do
+          button text: "abort"
+        end
+      end
+    }
+  end
+
+  def some_form_config
+    {
+      for: @my_model,
+      method: :post,
+      path: :inline_form_action_path, #or any other rails route
+      params: {
+        id: @my_model.id
+      },
+      success:{
+        emit: "item_updated"
+      }
+    }
+  end
+
+end
+```
+ If you click on the attribute value, the form gets shown. After successful form submission, the form gets hidden again and only the simple value is shown.
+
 ### Example 4: Hide after show on event
 
 On our example page, we wrap a simple timestamp in an async component and tell it to show up when the event `my_event` gets triggered and be hidden after 1000ms.

spec/dummy/app/controllers/my_app_controller.rb

@@ -30,6 +30,10 @@ def collection
     responder_for(Pages::MyApp::Collection)
   end
 
+  def inline_edit
+    responder_for(Pages::MyApp::InlineEdit)
+  end
+
   def some_action
     render json: {}, status: :ok
   end
@@ -47,6 +51,20 @@ def form_action
     end
   end
 
+  def inline_form_action
+    @dummy_model = DummyModel.find(params[:id])
+    @dummy_model.update(dummy_model_params)
+    if @dummy_model.errors.any?
+      render json: {
+        errors: @dummy_model.errors,
+        message: "Test Model could not be saved!"
+      }, status: :unproccessable_entity
+    else
+      broadcast "test_model_created"
+      render json: @dummy_model, status: :created
+    end
+  end
+
   def delete_dummy_model
     @dummy_model = DummyModel.find(params[:id])
     if @dummy_model.destroy

spec/dummy/app/matestack/apps/my_app.rb

@@ -39,6 +39,9 @@ def navigation_section
         transition path: :collection_path do
           button text: "Collection"
         end
+        transition path: :inline_edit_path do
+          button text: "Inline Edit"
+        end
       end
     }
   end

spec/dummy/app/matestack/pages/my_app/inline_edit.rb

@@ -0,0 +1,58 @@
+class Pages::MyApp::InlineEdit < Matestack::Ui::Page
+
+  def prepare
+    @my_model = DummyModel.last
+  end
+
+  def response
+    components {
+      heading size: 2, text: "Inline Edit"
+
+      partial :show_value
+      partial :show_form
+    }
+  end
+
+  def show_value
+    partial {
+      async rerender_on: "item_updated", show_on: "item_updated", hide_on: "update_item", init_show: true do
+        onclick emit: "update_item" do
+          plain @my_model.title
+          plain "(click me)"
+        end
+      end
+    }
+  end
+
+  def show_form
+    partial {
+      async rerender_on: "item_updated", show_on: "update_item", hide_on: "item_updated" do
+        form some_form_config, :include do
+          form_input key: :title, type: :text
+          form_submit do
+            button text: "save"
+          end
+        end
+        onclick emit: "item_updated" do
+          button text: "abort"
+        end
+      end
+    }
+  end
+
+  def some_form_config
+    {
+      for: @my_model,
+      method: :post,
+      path: :inline_form_action_path,
+      params: {
+        id: @my_model.id
+      },
+      success:{
+        emit: "item_updated"
+      }
+    }
+  end
+
+
+end

spec/dummy/app/matestack/pages/my_app/my_first_page.rb

@@ -1,5 +1,9 @@
 class Pages::MyApp::MyFirstPage < Matestack::Ui::Page
 
+  def prepare
+    @my_model = DummyModel.last
+  end
+
   def response
     components {
       heading size: 2, text: "This is Page 1"

spec/dummy/config/routes.rb

@@ -27,9 +27,11 @@
     get 'my_fifth_page', to: 'my_app#my_fifth_page'
     get 'my_sixth_page', to: 'my_app#my_sixth_page'
     get 'collection', to: 'my_app#collection'
+    get 'inline_edit', to: 'my_app#inline_edit'
 
     post 'some_action', to: 'my_app#some_action'
     post 'form_action', to: 'my_app#form_action'
+    post 'inline_form_action/:id', to: 'my_app#inline_form_action', as: "inline_form_action"
 
     delete 'delete_dummy_model', to: 'my_app#delete_dummy_model'
   end

spec/usage/components/async_spec.rb

@@ -143,7 +143,66 @@ def response
     expect(page).not_to have_selector "#my-div"
   end
 
-  it "Example 3 - hide after show on event" do
+  it "Example 3.1 - Show on / Hide on combination init not shown by default" do
+
+    class ExamplePage < Matestack::Ui::Page
+
+      def response
+        components {
+          async show_on: "my_show_event", hide_on: "my_hide_event" do
+            div id: "my-div" do
+              plain "#{DateTime.now.strftime('%Q')}"
+            end
+          end
+        }
+      end
+
+    end
+
+    visit "/example"
+
+    expect(page).not_to have_selector "#my-div"
+
+    page.execute_script('MatestackUiCore.matestackEventHub.$emit("my_show_event")')
+
+    expect(page).to have_selector "#my-div"
+
+    page.execute_script('MatestackUiCore.matestackEventHub.$emit("my_hide_event")')
+
+    expect(page).not_to have_selector "#my-div"
+  end
+
+  it "Example 3.2 - Show on / Hide on combination init shown if configured" do
+
+    class ExamplePage < Matestack::Ui::Page
+
+      def response
+        components {
+          async show_on: "my_show_event", hide_on: "my_hide_event", init_show: true do
+            div id: "my-div" do
+              plain "#{DateTime.now.strftime('%Q')}"
+            end
+          end
+        }
+      end
+
+    end
+
+    visit "/example"
+
+    expect(page).to have_selector "#my-div"
+
+    page.execute_script('MatestackUiCore.matestackEventHub.$emit("my_hide_event")')
+
+    expect(page).not_to have_selector "#my-div"
+
+    page.execute_script('MatestackUiCore.matestackEventHub.$emit("my_show_event")')
+
+    expect(page).to have_selector "#my-div"
+  end
+
+
+  it "Example 3.3 - hide after show on event" do
 
     class ExamplePage < Matestack::Ui::Page