feat(demo): add a navigation ping-pong to the Routes lab by erkamyaman · Pull Request #191 · santoshyadavdev/angular-devtools

erkamyaman · 2026-10-01T09:41:52Z

Adds a Navigation ping-pong button to the Routes lab (/examples/routes). Its code navigates between Details and Summary six times in a row, starting from whichever of the two the page is not on. The Guard loop link already covered redirect loops, so this is the case for code-driven navigation loops.

Fixes #102

Checks

Ran the devtools' loop detection (watchRouter, instrument, captureCallers, detectLoops) on a real Router with the same function: it reports a navigation loop, summary → details → summary, 3 bounces
Two new demo tests for the hop order; one fails with the starting-page logic removed
nx test angular-devtools, pnpm typecheck, pnpm format:check and the docs build pass

Summary by CodeRabbit

New Features
- Added a “Navigation ping-pong” button to the Routes example. It navigates between the Details and Summary views six times, demonstrating how a navigation loop appears.
Documentation
- Updated the Routes and router inspector guides with the Navigation ping-pong example and clarified that Guard loop demonstrates a redirect loop.
Style
- Buttons in the navigation examples now have link-style appearance, hover states, visible focus outlines, and pointer cursors.

The Routes lab had a guard loop for redirect loops but nothing that triggers a navigation loop, so testing that detection meant writing one by hand. A Navigation ping-pong button now navigates between Details and Summary from code six times in a row, which the Navigations view flags as a navigation loop. Fixes santoshyadavdev#102

coderabbitai · 2026-10-01T09:42:15Z

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📥 Commits

Reviewing files that changed from the base of the PR and between b625fba and 7a8a3dd.

📒 Files selected for processing (2)

src/app/examples/routes-example.spec.ts
src/app/examples/routes-example.ts

📝 Walkthrough

Walkthrough

The Routes lab adds a button that navigates between Details and Summary for a bounded number of hops. The helper defaults to six hops. Tests check navigation sequences from both routes, and documentation describes the scenario.

Changes

Navigation ping-pong

Layer / File(s)	Summary
Bounded navigation helper and tests `src/app/examples/ping-pong.ts`, `src/app/examples/route-guards.spec.ts`	The helper alternates between Details and Summary and awaits each navigation. Tests check navigation sequences starting from each route.
Routes lab integration and documentation `src/app/examples/routes-example.ts`, `apps/docs/src/content/contributing/demo-apps.md`, `apps/docs/src/content/inspectors/router.md`	The Routes example adds a button that runs the helper and applies navigation styling to buttons. The lab table and router guide describe the scenario.

Priority: ➖ Normal

Estimated code review effort: 2 (Simple) | ~12 minutes

Change: Feature · Severity of issue fixed: Medium

Sequence Diagram(s)

sequenceDiagram
  participant RoutesExample
  participant pingPong
  participant Router
  RoutesExample->>pingPong: Start ping-pong with Router
  loop Up to the configured number of hops
    pingPong->>Router: Navigate to the opposite route
    Router-->>pingPong: Complete navigation
  end

Suggested labels: enhancement

Merge Risk: 🔵 Low · up to b625f

Rapid clicks can disrupt the demo’s six-hop sequence. This is a bounded, demo-only issue; disabling the button during a run would make the demonstration reliable.

🚥 Pre-merge checks | ✅ 4 | ❓ 1

❌ Failed checks (1 inconclusive)

Check name	Status	Explanation	Resolution
Linked Issues check	❓ Inconclusive	The PR implements the optional Navigation ping-pong with bounded, alternating `router.navigate` calls and adds hop-order tests. It updates both requested documentation files. The existing Guard loop i…	Provide reviewable evidence for the relevant entries in `src/app/app.routes.server.ts` and the lab route definitions. The evidence must show that the routes covered by issue `#102` use `RenderMode.Client`.

✅ Passed checks (4 passed)

Check name	Status	Explanation
Description Check	✅ Passed	Check skipped - CodeRabbit’s high-level summary is enabled.
Title check	✅ Passed	The title clearly and concisely describes the main change: adding a navigation ping-pong scenario to the Routes lab.
Out of Scope Changes check	✅ Passed	The changed files support issue `#102`. The button and `pingPong` helper implement the optional navigation scenario. The tests verify bounded hop order. The documentation and style changes support the R…
Docstring Coverage	✅ Passed	Docstring coverage is 100.00% which is sufficient. The required threshold is 80.00%. Docstring coverage is scoped to functions touched by this diff. Analyzed 1 functions across 3 files. (2 skipped: 2 …

Full details: Linked Issues check

Explanation

The PR implements the optional Navigation ping-pong with bounded, alternating router.navigate calls and adds hop-order tests. It updates both requested documentation files. The existing Guard loop is unchanged, so this PR does not need to reimplement it. The available evidence does not establish whether the lab routes use RenderMode.Client in src/app/app.routes.server.ts, which is a coding requirement in issue #102.

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_{A rabbit taps the route button with care,
From Details to Summary, then back through the air.
Six hops are counted, each journey complete,
The tests trace the paths with a steady beat.
The guide names the loop for explorers to see.}

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nx-cloud · 2026-10-01T09:44:43Z

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☁️ Nx Cloud last updated this comment at 2026-10-01 10:39:00 UTC

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Inline comments:
Review comments at @src/app/examples/routes-example.ts:
- Around line 84-86: Update the pingPong action to track in-flight work with a
busy signal, return early on repeated calls, and reset the signal in a finally
block after awaiting pingPong(this.router). Import signal from @angular/core and
bind the corresponding template button’s disabled state to busy().

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Reviewing files that changed from the base of the PR and between 28e51ce and b625fba.

📒 Files selected for processing (5)

apps/docs/src/content/contributing/demo-apps.md
apps/docs/src/content/inspectors/router.md
src/app/examples/ping-pong.ts
src/app/examples/route-guards.spec.ts
src/app/examples/routes-example.ts

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A second click on Navigation ping-pong started another chain that ran over the first. The button now ignores clicks while a chain runs and marks itself aria-disabled, staying focusable so keyboard focus is not lost.

Brings in santoshyadavdev#189, santoshyadavdev#191, santoshyadavdev#193 and santoshyadavdev#194. Keeps the one-path loop paragraph next to the new Routes lab sentence in the router docs, adds the santoshyadavdev#194 upgrade note to the 0.0.6 changelog, and rebuilds extension/ui.

erkamyaman requested a review from santoshyadavdev as a code owner October 1, 2026 09:41

github-actions Bot added area: demo The demo apps area: docs The documentation site labels Oct 1, 2026

coderabbitai Bot added the enhancement label Oct 1, 2026

coderabbitai Bot reviewed Oct 1, 2026

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Comment thread src/app/examples/routes-example.ts Outdated

fix(demo): run one navigation ping-pong at a time

7a8a3dd

A second click on Navigation ping-pong started another chain that ran over the first. The button now ignores clicks while a chain runs and marks itself aria-disabled, staying focusable so keyboard focus is not lost.

erkamyaman merged commit 9169b80 into santoshyadavdev:main Oct 1, 2026
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feat(demo): add a navigation ping-pong to the Routes lab - #191

feat(demo): add a navigation ping-pong to the Routes lab#191
erkamyaman merged 2 commits into
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erkamyaman:feat/demo-ping-pong

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