fix(accordion): improve functionality with nested accordions

core/src/components/accordion-group/accordion-group.tsx

@@ -199,7 +199,7 @@ export class AccordionGroup implements ComponentInterface {
    */
   @Method()
   async getAccordions() {
-    return Array.from(this.el.querySelectorAll('ion-accordion'));
+    return Array.from(this.el.querySelectorAll(':scope > ion-accordion')) as HTMLIonAccordionElement[];
   }
 
   render() {

core/src/components/accordion/test/accordion.e2e.ts

@@ -0,0 +1,55 @@
+import { newE2EPage } from '@stencil/core/testing';
+
+test('should properly set readonly on child accordions', async () => {
+  const page = await newE2EPage({
+    html: `
+      <ion-accordion-group animated="false">
+        <ion-accordion>
+          <ion-item slot="header">Label</ion-item>
+          <div slot="content">Content</div>
+        </ion-accordion>
+      </ion-accordion-group>
+    `
+  });
+
+  const accordion = await page.find('ion-accordion');
+  const value = await accordion.getProperty('readonly');
+
+  expect(value).toBe(false);
+
+  await page.$eval('ion-accordion-group', (el: HTMLIonAccordionGroupElement) => {
+    el.readonly = true;
+  });
+
+  await page.waitForChanges();
+
+  const valueAgain = await accordion.getProperty('readonly');
+  expect(valueAgain).toBe(true);
+});
+
+test('should properly set disabled on child accordions', async () => {
+  const page = await newE2EPage({
+    html: `
+      <ion-accordion-group animated="false">
+        <ion-accordion>
+          <ion-item slot="header">Label</ion-item>
+          <div slot="content">Content</div>
+        </ion-accordion>
+      </ion-accordion-group>
+    `
+  });
+
+  const accordion = await page.find('ion-accordion');
+  const value = await accordion.getProperty('disabled');
+
+  expect(value).toBe(false);
+
+  await page.$eval('ion-accordion-group', (el: HTMLIonAccordionGroupElement) => {
+    el.disabled = true;
+  });
+
+  await page.waitForChanges();
+
+  const valueAgain = await accordion.getProperty('disabled');
+  expect(valueAgain).toBe(true);
+});

core/src/components/accordion/test/accordion.spec.ts

@@ -3,64 +3,6 @@ import { AccordionGroup } from '../../accordion-group/accordion-group.tsx';
 import { Accordion } from '../accordion.tsx';
 import { Item } from '../../item/item.tsx';
 
-it('should properly set readonly on child accordions', async () => {
-  const page = await newSpecPage({
-    components: [Item, Accordion, AccordionGroup],
-    html: `
-      <ion-accordion-group animated="false">
-        <ion-accordion>
-          <ion-item slot="header">Label</ion-item>
-          <div slot="content">Content</div>
-        </ion-accordion>
-      </ion-accordion-group>
-    `
-  });
-
-  const accordionGroup = page.body.querySelector('ion-accordion-group');
-  const accordions = accordionGroup.querySelectorAll('ion-accordion');
-
-  expect(accordions.length).toEqual(1);
-  accordions.forEach(accordion => {
-    expect(accordion.readonly).toEqual(false);
-  });
-
-  accordionGroup.readonly = true;
-  await page.waitForChanges();
-
-  accordions.forEach(accordion => {
-    expect(accordion.readonly).toEqual(true);
-  });
-});
-
-it('should properly set disabled on child accordions', async () => {
-  const page = await newSpecPage({
-    components: [Item, Accordion, AccordionGroup],
-    html: `
-      <ion-accordion-group animated="false">
-        <ion-accordion>
-          <ion-item slot="header">Label</ion-item>
-          <div slot="content">Content</div>
-        </ion-accordion>
-      </ion-accordion-group>
-    `
-  });
-
-  const accordionGroup = page.body.querySelector('ion-accordion-group');
-  const accordions = accordionGroup.querySelectorAll('ion-accordion');
-
-  expect(accordions.length).toEqual(1);
-  accordions.forEach(accordion => {
-    expect(accordion.disabled).toEqual(false);
-  });
-
-  accordionGroup.disabled = true;
-  await page.waitForChanges();
-
-  accordions.forEach(accordion => {
-    expect(accordion.disabled).toEqual(true);
-  });
-});
-
 it('should open correct accordions', async () => {
   const page = await newSpecPage({
     components: [Item, Accordion, AccordionGroup],

core/src/components/accordion/test/nested/e2e.ts

@@ -0,0 +1,10 @@
+import { newE2EPage } from '@stencil/core/testing';
+
+test('nested: basic', async () => {
+  const page = await newE2EPage({
+    url: '/src/components/accordion/test/nested?ionic:_testing=true'
+  });
+
+  const compare = await page.compareScreenshot();
+  expect(compare).toMatchScreenshot();
+});

core/src/components/accordion/test/nested/index.html

@@ -0,0 +1,81 @@
+<!DOCTYPE html>
+<html lang="en" dir="ltr">
+  <head>
+    <meta charset="UTF-8">
+    <title>Accordion - Nested</title>
+    <meta name="viewport"
+      content="width=device-width, initial-scale=1.0, minimum-scale=1.0">
+    <link href="../../../../../css/ionic.bundle.css" rel="stylesheet">
+    <link href="../../../../../scripts/testing/styles.css" rel="stylesheet">
+    <script src="../../../../../scripts/testing/scripts.js"></script>
+    <script type="module" src="../../../../../dist/ionic/ionic.esm.js"></script>
+    <style>
+      .grid {
+        display: grid;
+        grid-template-columns: repeat(auto-fill, minmax(250px, 1fr));
+        grid-row-gap: 20px;
+        grid-column-gap: 20px;
+      }
+      h2 {
+        font-size: 12px;
+        font-weight: normal;
+
+        color: #6f7378;
+
+        margin-top: 10px;
+        margin-left: 5px;
+      }
+    </style>
+  </head>
+  <body>
+    <ion-app>
+      <ion-header translucent="true">
+        <ion-toolbar>
+          <ion-title>Accordion - Nested</ion-title>
+        </ion-toolbar>
+      </ion-header>
+      <ion-content fullscreen="true" color="light">
+        <ion-header collapse="condense">
+          <ion-toolbar color="light">
+            <ion-title size="large">Accordion - Basic</ion-title>
+          </ion-toolbar>
+        </ion-header>
+
+        <div class="grid ion-padding">
+          <div class="grid-item">
+            <h2>Nested</h2>
+            <ion-accordion-group expand="inset" value="attractions">
+              <ion-accordion value="attractions">
+                <ion-item color="primary" slot="header" button detail="false">
+                  <ion-icon slot="start" ios="film-outline" md="film"></ion-icon>
+                  <ion-label> Attractions</ion-label>
+                </ion-item>
+
+                <ion-accordion-group slot="content" value="second">
+                  <ion-accordion value="first">
+                    <ion-item color="primary" slot="header" button detail="false">
+                      <ion-label>First Item</ion-label>
+                    </ion-item>
+                    <div slot="content">First item content!</div>
+                  </ion-accordion>
+                  <ion-accordion value="second">
+                    <ion-item color="warning" slot="header" button detail="false">
+                      <ion-label>Second Item</ion-label>
+                    </ion-item>
+                    <div slot="content">Second item content!</div>
+                  </ion-accordion>
+                  <ion-accordion value="third">
+                    <ion-item color="tertiary" slot="header" button detail="false">
+                      <ion-label>Third Item</ion-label>
+                    </ion-item>
+                    <div slot="content">Third item content!</div>
+                  </ion-accordion>
+                </ion-accordion-group>
+              </ion-accordion>
+            </ion-accordion-group>
+          </div>
+        </div>
+      </ion-content>
+    </ion-app>
+  </body>
+</html>

core/src/css/core.scss

@@ -274,19 +274,19 @@ ion-card-header.ion-color .ion-inherit-color {
 }
 
 // Accordion Styles
-ion-accordion-group.accordion-group-expand-inset ion-accordion:first-of-type {
+ion-accordion-group.accordion-group-expand-inset > ion-accordion:first-of-type {
   border-top-left-radius: 8px;
   border-top-right-radius: 8px;
 }
-ion-accordion-group.accordion-group-expand-inset ion-accordion:last-of-type {
+ion-accordion-group.accordion-group-expand-inset > ion-accordion:last-of-type {
   border-bottom-left-radius: 8px;
   border-bottom-right-radius: 8px;
 }
-ion-accordion-group ion-accordion:last-of-type ion-item {
+ion-accordion-group > ion-accordion:last-of-type ion-item {
   --border-width: 0px;
 }
 
-ion-accordion.accordion-animated .ion-accordion-toggle-icon {
+ion-accordion.accordion-animated > [slot="header"] .ion-accordion-toggle-icon {
   transition: 300ms transform cubic-bezier(0.25, 0.8, 0.5, 1);
 }
 
@@ -296,18 +296,24 @@ ion-accordion.accordion-animated .ion-accordion-toggle-icon {
     transition: none !important;
   }
 }
-
-ion-accordion.accordion-expanding .ion-accordion-toggle-icon,
-ion-accordion.accordion-expanded .ion-accordion-toggle-icon {
+/**
+ * The > [slot="header"] selector ensures that we do
+ * not modify toggle icons for any nested accordions. The state
+ * of one accordion should not affect any accordions inside
+ * of a nested accordion group.
+ */
+ion-accordion.accordion-expanding > [slot="header"] .ion-accordion-toggle-icon,
+ion-accordion.accordion-expanded > [slot="header"] .ion-accordion-toggle-icon {
   transform: rotate(180deg);
 }
-ion-accordion-group.accordion-group-expand-inset.md ion-accordion.accordion-previous ion-item[slot="header"] {
+
+ion-accordion-group.accordion-group-expand-inset.md > ion-accordion.accordion-previous ion-item[slot="header"] {
   --border-width: 0px;
   --inner-border-width: 0px;
 }
 
-ion-accordion-group.accordion-group-expand-inset.md ion-accordion.accordion-expanding:first-of-type,
-ion-accordion-group.accordion-group-expand-inset.md ion-accordion.accordion-expanded:first-of-type {
+ion-accordion-group.accordion-group-expand-inset.md > ion-accordion.accordion-expanding:first-of-type,
+ion-accordion-group.accordion-group-expand-inset.md > ion-accordion.accordion-expanded:first-of-type {
   margin-top: 0;
 }