feat(router): add hash-based navigation option to setUpLocationSync (#28609)

The `setUpLocationSync` function in @angular/router/upgrade didn't previously let you sync hash-based navigations. With this change, you can now pass an option to `setUpLocationSync` that will make sure location changes run in Angular in hash-based apps.

Fixes #24429 #21995

PR Close #28609

packages/router/upgrade/src/upgrade.ts

@@ -58,7 +58,7 @@ export function locationSyncBootstrapListener(ngUpgrade: UpgradeModule) {
  *
  * @publicApi
  */
-export function setUpLocationSync(ngUpgrade: UpgradeModule) {
+export function setUpLocationSync(ngUpgrade: UpgradeModule, urlType: 'path' | 'hash' = 'path') {
   if (!ngUpgrade.$injector) {
     throw new Error(`
         RouterUpgradeInitializer can be used only after UpgradeModule.bootstrap has been called.
@@ -71,7 +71,16 @@ export function setUpLocationSync(ngUpgrade: UpgradeModule) {
 
   ngUpgrade.$injector.get('$rootScope')
       .$on('$locationChangeStart', (_: any, next: string, __: string) => {
-        const url = resolveUrl(next);
+        let url;
+        if (urlType === 'path') {
+          url = resolveUrl(next);
+        } else if (urlType === 'hash') {
+          // Remove the first hash from the URL
+          const hashIdx = next.indexOf('#');
+          url = resolveUrl(next.substring(0, hashIdx) + next.substring(hashIdx + 1));
+        } else {
+          throw 'Invalid URLType passed to setUpLocationSync: ' + urlType;
+        }
         const path = location.normalize(url.pathname);
         router.navigateByUrl(path + url.search + url.hash);
       });

packages/router/upgrade/test/upgrade.spec.ts

@@ -79,6 +79,30 @@ describe('setUpLocationSync', () => {
     expect(RouterMock.navigateByUrl).toHaveBeenCalledWith(normalizedPathname + query + hash);
   });
 
+  it('should allow configuration to work with hash-based routing', () => {
+    const url = 'https://google.com';
+    const pathname = '/custom/route';
+    const normalizedPathname = 'foo';
+    const query = '?query=1&query2=3';
+    const hash = '#new/hash';
+    const combinedUrl = url + '#' + pathname + query + hash;
+    const $rootScope = jasmine.createSpyObj('$rootScope', ['$on']);
+
+    upgradeModule.$injector.get.and.returnValue($rootScope);
+    LocationMock.normalize.and.returnValue(normalizedPathname);
+
+    setUpLocationSync(upgradeModule, 'hash');
+
+    const callback = $rootScope.$on.calls.argsFor(0)[1];
+    callback({}, combinedUrl, '');
+
+    expect(LocationMock.normalize).toHaveBeenCalledTimes(1);
+    expect(LocationMock.normalize).toHaveBeenCalledWith(pathname);
+
+    expect(RouterMock.navigateByUrl).toHaveBeenCalledTimes(1);
+    expect(RouterMock.navigateByUrl).toHaveBeenCalledWith(normalizedPathname + query + hash);
+  });
+
   it('should work correctly on browsers that do not start pathname with `/`', () => {
     const anchorProto = HTMLAnchorElement.prototype;
     const originalDescriptor = Object.getOwnPropertyDescriptor(anchorProto, 'pathname');
@@ -98,4 +122,5 @@ describe('setUpLocationSync', () => {
       Object.defineProperty(anchorProto, 'pathname', originalDescriptor !);
     }
   });
+
 });

tools/public_api_guard/router/upgrade.d.ts

@@ -5,4 +5,4 @@ export declare const RouterUpgradeInitializer: {
     deps: (typeof UpgradeModule)[];
 };
 
-export declare function setUpLocationSync(ngUpgrade: UpgradeModule): void;
+export declare function setUpLocationSync(ngUpgrade: UpgradeModule, urlType?: 'path' | 'hash'): void;