Fix after first render issues of BitCarousel (#10252)

[msynk]

closes #10252

Summary by CodeRabbit

• Refactor

  • Streamlined the carousel component’s initial loading behavior for smoother visual adjustments.

• Bug Fixes

  • Improved error handling and validations during UI resize events to ensure a more robust and responsive display experience.

[coderabbitai]

Walkthrough

This pull request refactors the BitCarousel component’s OnAfterRenderAsync method by consolidating all first-render operations into a single conditional block. The changes ensure that during the initial render, operations including JavaScript resize observer registration, scroll item count adjustments, dimension resets, and page visibility initialization occur once. Additionally, the PR enhances the Observers.ts functionality by adding input validation and error handling in both the registerResize and unregisterResize methods. No modifications were made to public or exported entities.

Changes

File(s)	Summary
src/BlazorUI/.../Carousel/BitCarousel.razor.cs	Refactored OnAfterRenderAsync by consolidating first-render logic into one conditional block; removed redundant checks and streamlined initialization.
src/BlazorUI/.../Scripts/Observers.ts	Added input validation (ensuring element is valid) and wrapped registerResize and unregisterResize logic in try/catch blocks for improved error handling.

Sequence Diagram(s)

sequenceDiagram
    participant Carousel as BitCarousel
    participant JS as Observers.js

    Carousel->>Carousel: OnAfterRenderAsync(firstRender)
    alt firstRender = true
        Carousel->>JS: registerResize(element, callback)
        JS-->>Carousel: Observer registered (or error logged)
        Carousel->>Carousel: Adjust scroll items and reset dimensions
        Carousel->>Carousel: Initialize page visibility
    else
        Carousel->>Carousel: Execute subsequent rendering logic
    end

Loading

Poem

Hop, hop, I’m a coding bunny,
Tapping keys, making logic sunny.
I see first renders now quite clear,
With observers guarding far and near.
A nibble of code, a hop of cheer —
ASCII bops and joyful gear!
🐰💻 Hop on, dear code, hop on!

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📜 Recent review details

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📥 Commits

Reviewing files that changed from the base of the PR and between 0eef15e and de17341.

📒 Files selected for processing (2)

• src/BlazorUI/Bit.BlazorUI/Components/Lists/Carousel/BitCarousel.razor.cs (2 hunks)
• src/BlazorUI/Bit.BlazorUI/Scripts/Observers.ts (1 hunks)

⏰ Context from checks skipped due to timeout of 90000ms (1)

• GitHub Check: build and test

🔇 Additional comments (5)

src/BlazorUI/Bit.BlazorUI/Components/Lists/Carousel/BitCarousel.razor.cs (2)

213-225: Improved first render handling with better control flow.

This refactoring consolidates all first-render operations into a single conditional block, which improves code clarity and ensures that initialization tasks only execute once. The structured approach prevents potential duplicate operations that could occur if these checks were scattered throughout the method.

---

243-243: Good practice moving base method call to the end.

Moving the base.OnAfterRenderAsync call to the end of the method follows best practices by ensuring that all component-specific logic completes before the base implementation runs.

src/BlazorUI/Bit.BlazorUI/Scripts/Observers.ts (3)

6-6: Good defensive programming with input validation.

Adding validation to check that the element exists and is an instance of Element prevents potential runtime errors when invalid parameters are passed.

---

8-20: Enhanced error handling with try-catch block.

Wrapping the resize observer creation and registration in a try-catch block improves robustness by gracefully handling potential exceptions during the observer setup process. The error logging will help with debugging if issues occur.

---

24-35: Consistent error handling in unregister method.

The unregister method now has the same robust error handling as the register method, with proper validation and exception handling. This symmetry ensures both operations are equally protected against failures.

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