[FEATURE] Add support for public in-element

packages/@ember/-internals/glimmer/lib/syntax/in-element.ts

@@ -0,0 +1,38 @@
+/**
+ @module ember
+ */
+
+/**
+ The `in-element` helper renders its block content outside of the regular flow,
+ into a DOM element given by its `destinationElement` positional argument.
+
+ Common use cases - often referred to as "portals" or "wormholes" - are rendering
+ dropdowns, modals or tooltips close to the root of the page to bypass CSS overflow
+ rules, or to render content to parts of the page that are outside of the control
+ of the Ember app itself (e.g. embedded into a static or server rendered HTML page).
+
+ ```handlebars
+ {{#in-element this.destinationElement}}
+   <div>Some content</div>
+ {{/in-element}}
+ ```
+
+ ### Arguments
+
+ `{{in-element}}` requires a single positional argument:
+
+ - `destinationElement` -- the DOM element to render into. It must exist at the time
+ of rendering.
+
+ It also supports an optional named argument:
+
+ - `insertBefore` -- by default the DOM element's content is replaced when used as
+ `destinationElement`. Passing `null` changes the behaviour to appended at the end
+ of any existing content. Any other value than `null` is currently not supported.
+
+ ```
+
+ @method in-element
+ @for Ember.Templates.helpers
+ @public
+ */

packages/@ember/-internals/glimmer/tests/integration/syntax/in-element-test.js → packages/@ember/-internals/glimmer/tests/integration/syntax/deprecated-in-element-test.js

@@ -1,12 +1,14 @@
 import { moduleFor, RenderingTestCase, strip, equalTokens, runTask } from 'internal-test-helpers';
-
 import { Component } from '@ember/-internals/glimmer';
 import { set } from '@ember/-internals/metal';
+import { EMBER_GLIMMER_IN_ELEMENT } from '@ember/canary-features';
+
+const deprecationMessage = /The use of the private `{{-in-element}}` is deprecated, please refactor to the public `{{in-element}}`/;
 
 moduleFor(
   '{{-in-element}}',
   class extends RenderingTestCase {
-    ['@test using {{#in-element whatever}} asserts']() {
+    ['@feature(!EMBER_GLIMMER_IN_ELEMENT) using {{#in-element whatever}} asserts']() {
       // the in-element keyword is not yet public API this test should be removed
       // once https://github.com/emberjs/rfcs/pull/287 lands and is enabled
 
@@ -17,6 +19,10 @@ moduleFor(
     }
 
     ['@test allows rendering into an external element']() {
+      if (EMBER_GLIMMER_IN_ELEMENT) {
+        expectDeprecation(deprecationMessage);
+      }
+
       let someElement = document.createElement('div');
 
       this.render(
@@ -47,7 +53,11 @@ moduleFor(
       equalTokens(someElement, 'Whoop!');
     }
 
-    ['@test it appends to the extenal element by default']() {
+    ['@test it appends to the external element by default']() {
+      if (EMBER_GLIMMER_IN_ELEMENT) {
+        expectDeprecation(deprecationMessage);
+      }
+
       let someElement = document.createElement('div');
       someElement.appendChild(document.createTextNode('foo '));
 
@@ -80,6 +90,10 @@ moduleFor(
     }
 
     ['@test allows appending to the external element with insertBefore=null']() {
+      if (EMBER_GLIMMER_IN_ELEMENT) {
+        expectDeprecation(deprecationMessage);
+      }
+
       let someElement = document.createElement('div');
       someElement.appendChild(document.createTextNode('foo '));
 
@@ -112,6 +126,10 @@ moduleFor(
     }
 
     ['@test allows clearing the external element with insertBefore=undefined']() {
+      if (EMBER_GLIMMER_IN_ELEMENT) {
+        expectDeprecation(deprecationMessage);
+      }
+
       let someElement = document.createElement('div');
       someElement.appendChild(document.createTextNode('foo '));
 
@@ -144,6 +162,10 @@ moduleFor(
     }
 
     ['@test does not allow insertBefore=non-null-value']() {
+      if (EMBER_GLIMMER_IN_ELEMENT) {
+        expectDeprecation(deprecationMessage);
+      }
+
       let someElement = document.createElement('div');
 
       expectAssertion(() => {
@@ -162,6 +184,10 @@ moduleFor(
     }
 
     ['@test components are cleaned up properly'](assert) {
+      if (EMBER_GLIMMER_IN_ELEMENT) {
+        expectDeprecation(deprecationMessage);
+      }
+
       let hooks = [];
 
       let someElement = document.createElement('div');
@@ -229,7 +255,11 @@ moduleFor(
       assert.deepEqual(hooks, ['didInsertElement', 'willDestroyElement']);
     }
 
-    ['@test appending to the root element should not cause double clearing  are cleaned up properly']() {
+    ['@test appending to the root element should not cause double clearing']() {
+      if (EMBER_GLIMMER_IN_ELEMENT) {
+        expectDeprecation(deprecationMessage);
+      }
+
       this.render(
         strip`
           Before

packages/@ember/-internals/glimmer/tests/integration/syntax/public-in-element-test.js

@@ -0,0 +1,216 @@
+import { moduleFor, RenderingTestCase, strip, equalTokens, runTask } from 'internal-test-helpers';
+
+import { Component } from '@ember/-internals/glimmer';
+import { set } from '@ember/-internals/metal';
+
+moduleFor(
+  '{{in-element}}',
+  class extends RenderingTestCase {
+    ['@feature(EMBER_GLIMMER_IN_ELEMENT) allows rendering into an external element']() {
+      let someElement = document.createElement('div');
+
+      this.render(
+        strip`
+          {{#in-element someElement}}
+            {{text}}
+          {{/in-element}}
+        `,
+        {
+          someElement,
+          text: 'Whoop!',
+        }
+      );
+
+      equalTokens(this.element, '<!---->');
+      equalTokens(someElement, 'Whoop!');
+
+      this.assertStableRerender();
+
+      runTask(() => set(this.context, 'text', 'Huzzah!!'));
+
+      equalTokens(this.element, '<!---->');
+      equalTokens(someElement, 'Huzzah!!');
+
+      runTask(() => set(this.context, 'text', 'Whoop!'));
+
+      equalTokens(this.element, '<!---->');
+      equalTokens(someElement, 'Whoop!');
+    }
+
+    ["@feature(EMBER_GLIMMER_IN_ELEMENT) it replaces the external element's content by default"]() {
+      let someElement = document.createElement('div');
+      someElement.appendChild(document.createTextNode('foo '));
+
+      this.render(
+        strip`
+          {{#in-element someElement insertBefore=undefined}}
+            {{text}}
+          {{/in-element}}
+        `,
+        {
+          someElement,
+          text: 'bar',
+        }
+      );
+
+      equalTokens(this.element, '<!---->');
+      equalTokens(someElement, 'bar');
+
+      this.assertStableRerender();
+
+      runTask(() => set(this.context, 'text', 'bar!!'));
+
+      equalTokens(this.element, '<!---->');
+      equalTokens(someElement, 'bar!!');
+
+      runTask(() => set(this.context, 'text', 'bar'));
+
+      equalTokens(this.element, '<!---->');
+      equalTokens(someElement, 'bar');
+    }
+
+    ['@feature(EMBER_GLIMMER_IN_ELEMENT) allows appending to the external element with insertBefore=null']() {
+      let someElement = document.createElement('div');
+      someElement.appendChild(document.createTextNode('foo '));
+
+      this.render(
+        strip`
+          {{#in-element someElement insertBefore=null}}
+            {{text}}
+          {{/in-element}}
+        `,
+        {
+          someElement,
+          text: 'bar',
+        }
+      );
+
+      equalTokens(this.element, '<!---->');
+      equalTokens(someElement, 'foo bar');
+
+      this.assertStableRerender();
+
+      runTask(() => set(this.context, 'text', 'bar!!'));
+
+      equalTokens(this.element, '<!---->');
+      equalTokens(someElement, 'foo bar!!');
+
+      runTask(() => set(this.context, 'text', 'bar'));
+
+      equalTokens(this.element, '<!---->');
+      equalTokens(someElement, 'foo bar');
+    }
+
+    ['@feature(EMBER_GLIMMER_IN_ELEMENT) does not allow insertBefore=non-null-value']() {
+      let someElement = document.createElement('div');
+
+      expectAssertion(() => {
+        this.render(
+          strip`
+            {{#in-element someElement insertBefore=".foo"}}
+              {{text}}
+            {{/in-element}}
+          `,
+          {
+            someElement,
+            text: 'Whoop!',
+          }
+        );
+      }, /Can only pass null to insertBefore in in-element, received:/);
+    }
+
+    ['@feature(EMBER_GLIMMER_IN_ELEMENT) components are cleaned up properly'](assert) {
+      let hooks = [];
+
+      let someElement = document.createElement('div');
+
+      this.registerComponent('modal-display', {
+        ComponentClass: Component.extend({
+          didInsertElement() {
+            hooks.push('didInsertElement');
+          },
+
+          willDestroyElement() {
+            hooks.push('willDestroyElement');
+          },
+        }),
+
+        template: `{{text}}`,
+      });
+
+      this.render(
+        strip`
+          {{#if showModal}}
+            {{#in-element someElement}}
+              {{modal-display text=text}}
+            {{/in-element}}
+          {{/if}}
+        `,
+        {
+          someElement,
+          text: 'Whoop!',
+          showModal: false,
+        }
+      );
+
+      equalTokens(this.element, '<!---->');
+      equalTokens(someElement, '');
+
+      this.assertStableRerender();
+
+      runTask(() => set(this.context, 'showModal', true));
+
+      equalTokens(this.element, '<!---->');
+      this.assertComponentElement(someElement.firstChild, {
+        content: 'Whoop!',
+      });
+
+      runTask(() => set(this.context, 'text', 'Huzzah!'));
+
+      equalTokens(this.element, '<!---->');
+      this.assertComponentElement(someElement.firstChild, {
+        content: 'Huzzah!',
+      });
+
+      runTask(() => set(this.context, 'text', 'Whoop!'));
+
+      equalTokens(this.element, '<!---->');
+      this.assertComponentElement(someElement.firstChild, {
+        content: 'Whoop!',
+      });
+
+      runTask(() => set(this.context, 'showModal', false));
+
+      equalTokens(this.element, '<!---->');
+      equalTokens(someElement, '');
+
+      assert.deepEqual(hooks, ['didInsertElement', 'willDestroyElement']);
+    }
+
+    ['@feature(EMBER_GLIMMER_IN_ELEMENT) appending to the root element should not cause double clearing']() {
+      this.render(
+        strip`
+          Before
+          {{#in-element this.rootElement insertBefore=null}}
+            {{this.text}}
+          {{/in-element}}
+          After
+        `,
+        {
+          rootElement: this.element,
+          text: 'Whoop!',
+        }
+      );
+
+      equalTokens(this.element, 'BeforeWhoop!<!---->After');
+
+      this.assertStableRerender();
+
+      runTask(() => set(this.context, 'text', 'Huzzah!'));
+
+      equalTokens(this.element, 'BeforeHuzzah!<!---->After');
+
+      // teardown happens in afterEach and should not cause double-clearing error
+    }
+  }
+);

packages/@ember/canary-features/index.ts

@@ -20,6 +20,7 @@ export const DEFAULT_FEATURES = {
   EMBER_CUSTOM_COMPONENT_ARG_PROXY: true,
   EMBER_GLIMMER_SET_COMPONENT_TEMPLATE: true,
   EMBER_ROUTING_MODEL_ARG: true,
+  EMBER_GLIMMER_IN_ELEMENT: null,
 };
 
 /**
@@ -79,3 +80,4 @@ export const EMBER_GLIMMER_SET_COMPONENT_TEMPLATE = featureValue(
   FEATURES.EMBER_GLIMMER_SET_COMPONENT_TEMPLATE
 );
 export const EMBER_ROUTING_MODEL_ARG = featureValue(FEATURES.EMBER_ROUTING_MODEL_ARG);
+export const EMBER_GLIMMER_IN_ELEMENT = featureValue(FEATURES.EMBER_GLIMMER_IN_ELEMENT);