fix(router-outlet): add ability to active the same component.

core/api.txt

@@ -1045,7 +1045,7 @@ ion-router,none
 ion-router,prop,root,string,'/',false,false
 ion-router,prop,useHash,boolean,true,false,false
 ion-router,method,back,back() => Promise<void>
-ion-router,method,push,push(url: string, direction?: RouterDirection, animation?: AnimationBuilder | undefined) => Promise<boolean>
+ion-router,method,push,push(path: string, direction?: RouterDirection, animation?: AnimationBuilder | undefined) => Promise<boolean>
 ion-router,event,ionRouteDidChange,RouterEventDetail,true
 ion-router,event,ionRouteWillChange,RouterEventDetail,true
 

core/src/components/nav/view-controller.ts

@@ -1,6 +1,6 @@
 import { AnimationBuilder, ComponentProps, FrameworkDelegate, NavComponentWithProps } from '../../interface';
 import { attachComponent } from '../../utils/framework-delegate';
-import { assert } from '../../utils/helpers';
+import { assert, shallowEqualStringMap } from '../../utils/helpers';
 
 export const VIEW_STATE_NEW = 1;
 export const VIEW_STATE_ATTACHED = 2;
@@ -54,29 +54,8 @@ export const matches = (view: ViewController | undefined, id: string, params: Co
   if (view.component !== id) {
     return false;
   }
-  const currentParams = view.params;
-  if (currentParams === params) {
-    return true;
-  }
-  if (!currentParams && !params) {
-    return true;
-  }
-  if (!currentParams || !params) {
-    return false;
-  }
-  const keysA = Object.keys(currentParams);
-  const keysB = Object.keys(params);
-  if (keysA.length !== keysB.length) {
-    return false;
-  }
 
-  // Test for A's keys different from B.
-  for (const key of keysA) {
-    if (currentParams[key] !== params[key]) {
-      return false;
-    }
-  }
-  return true;
+  return shallowEqualStringMap(view.params, params);
 };
 
 export const convertToView = (page: any, params: ComponentProps | undefined): ViewController | null => {

core/src/components/router-outlet/route-outlet.tsx

@@ -5,6 +5,7 @@ import { getIonMode } from '../../global/ionic-global';
 import { Animation, AnimationBuilder, ComponentProps, ComponentRef, FrameworkDelegate, Gesture, NavOutlet, RouteID, RouteWrite, RouterDirection, RouterOutletOptions, SwipeGestureHandler } from '../../interface';
 import { getTimeGivenProgression } from '../../utils/animation/cubic-bezier';
 import { attachComponent, detachComponent } from '../../utils/framework-delegate';
+import { shallowEqualStringMap } from '../../utils/helpers';
 import { transition } from '../../utils/transition';
 
 @Component({
@@ -159,7 +160,7 @@ export class RouterOutlet implements ComponentInterface, NavOutlet {
   }
 
   private async setRoot(component: ComponentRef, params?: ComponentProps, opts?: RouterOutletOptions): Promise<boolean> {
-    if (this.activeComponent === component) {
+    if (this.activeComponent === component && shallowEqualStringMap(params, this.activeParams)) {
       return false;
     }
 

core/src/components/router-outlet/test/basic/e2e.ts

@@ -26,4 +26,18 @@ test('getRouteId() should return the route parameters', async () => {
 
   expect(routeId.id).toEqual('PAGE-THREE');
   expect(routeId.params).toEqual({ param: 'route' });
+});
+
+test('it should be possible to activate the same component provided parameters are different', async () => {
+  const page = await newE2EPage({
+    url: '/src/components/router-outlet/test/basic?ionic:_testing=true'
+  });  
+
+  await page.$eval('ion-item[href="#/page-4.1/foo"] ion-label', (el: any) => el.click());
+  await page.waitForChanges();
+  expect(await page.$eval('ion-router-outlet', (el) => el.textContent)).toMatch(/text = foo/);
+
+  await page.$eval('ion-item[href="#/page-4.2/bar"] ion-label', (el: any) => el.click());
+  await page.waitForChanges();
+  expect(await page.$eval('ion-router-outlet', (el) => el.textContent)).toMatch(/text = bar/);
 });

core/src/components/router-outlet/test/basic/index.html

@@ -58,9 +58,24 @@ <h1>Page Three</h1>
         `;
       }
     }
+    class PageFour extends HTMLElement {
+      connectedCallback() {
+        this.innerHTML = `
+          <ion-header>
+            <ion-toolbar>
+              <ion-title>Page Four</ion-title>
+            </ion-toolbar>
+          </ion-header>
+          <ion-content class="ion-padding">
+            <h1>text = ${this.text}</h1>
+          </ion-content>
+        `;
+      }
+    }    
     customElements.define('page-one', PageOne);
     customElements.define('page-two', PageTwo);
     customElements.define('page-three', PageThree);
+    customElements.define('page-four', PageFour);
   </script>
 </head>
 
@@ -70,6 +85,8 @@ <h1>Page Three</h1>
       <ion-route url="/" component="page-one"> </ion-route>
       <ion-route url="/two/:param" component="page-two"> </ion-route>
       <ion-route url="/page-3" component="page-three"> </ion-route>
+      <ion-route url="/page-4.1/:text" component="page-four"> </ion-route>
+      <ion-route url="/page-4.2/:text" component="page-four"> </ion-route>
     </ion-router>
 
     <ion-split-pane content-id="main">
@@ -89,6 +106,12 @@ <h1>Page Three</h1>
           <ion-item href="#/page-3">
             <ion-label>Page 3</ion-label>
           </ion-item>
+          <ion-item href="#/page-4.1/foo">
+            <ion-label>Page 4 (foo)</ion-label>
+          </ion-item>
+          <ion-item href="#/page-4.2/bar">
+            <ion-label>Page 4 (bar)</ion-label>
+          </ion-item>                    
         </ion-content>
       </ion-menu>
       <ion-router-outlet id="main"></ion-router-outlet>

core/src/utils/helpers.ts

@@ -348,3 +348,36 @@ export const debounce = (func: (...args: any[]) => void, wait = 0) => {
     timer = setTimeout(func, wait, ...args);
   };
 };
+
+/**
+ * Check whether the two string maps are shallow equal.
+ *
+ * undefined is treated as an empty map.
+ *
+ * @returns whether the keys are the same and the values are shallow equal.
+ */
+export const shallowEqualStringMap = (map1: {[k: string]: any} | undefined, map2: {[k: string]: any} | undefined): boolean => {
+  map1 ??= {};
+  map2 ??= {};
+
+  if (map1 === map2) {
+    return true;
+  }
+
+  const keys1 = Object.keys(map1);
+
+  if (keys1.length !== Object.keys(map2).length) {
+    return false;
+  }
+
+  for (const k1 of keys1) {
+    if (!(k1 in map2)) {
+      return false;
+    }
+    if (map1[k1] !== map2[k1]) {
+      return false;
+    }
+  }
+
+  return true;
+}