use-js-interop

Manage JavaScript interop in Blazor components with lifecycle timing and typed wrappers.

Updated May 28, 2026
One-click install
npx skills add https://github.com/ojrojas/AgentsInstructions --skill use-js-interop
Or copy as Structured Prompt for Agent
Please help me install this Agent Skill.
Skill: use-js-interop
Source: https://github.com/ojrojas/AgentsInstructions/tree/main/.claude/skills/dotnet-blazor/skills/use-js-interop
Command: npx skills add https://github.com/ojrojas/AgentsInstructions --skill use-js-interop

SYSTEM DOCUMENTATION & REQUIREMENTS

💡 This Skill includes scripts (resource) components.

What problem does it solve?

This Skill helps developers efficiently manage JavaScript interop in Blazor components, simplifying the process of calling JavaScript from Blazor and vice versa.

Core Features & Use Cases

  • Collocated JS Modules: Ensures that JavaScript interop is done through collocated .razor.js files for better maintainability.
  • Lifecycle Timing: Provides guidelines on when to perform JS interop, ensuring that it only happens when JavaScript is available.
  • Batch Operations: Offers strategies for batching interop calls to minimize cross-boundary communication.
  • Typed Interop Wrapper: Recommends the use of typed interop wrappers for a cleaner and more robust interop experience.
  • DotNetObjectReference: Explains how to use DotNetObjectReference for JavaScript-to-.NET callbacks.
  • Disposal and Server Safety: Ensures that all interop operations are properly disposed of to prevent memory leaks and handle server-side scenarios safely.
  • ElementReference: Emphasizes the use of ElementReference for passing DOM elements to JavaScript.

Quick Start

Use the use-js-interop skill to initialize a chart interop in your Blazor component.

Frequently Asked Questions about use-js-interop

High-intent search queries and answers about installing and using this skill.

FAQPage Schema
How do I call JavaScript functions from Blazor components?

You call JavaScript functions from Blazor by setting up typed interop wrappers and collocated `.razor.js` files. This approach minimizes cross-boundary communication and maintains a clean structure for function execution.

When is JavaScript available for interop during the Blazor component lifecycle?

JavaScript is available for interop only during specific Blazor component lifecycle stages. Following proper lifecycle timing guidelines ensures that interop operations execute safely only when the JavaScript runtime is fully accessible.

What is the best way to handle JavaScript-to-.NET callbacks in Blazor?

The best way to handle JavaScript-to-.NET callbacks in Blazor is by using `DotNetObjectReference`. This allows JavaScript to invoke .NET methods directly, ensuring robust and properly managed cross-boundary communication.

How do I prevent memory leaks when doing Blazor JavaScript interop?

To prevent memory leaks during Blazor JavaScript interop, you must ensure all operations are properly disposed of. Implementing correct disposal and server safety handling prevents memory leaks and manages server-side scenarios securely.

Can I pass DOM elements directly to JavaScript from Blazor?

Yes, you can pass DOM elements to JavaScript from Blazor by using `ElementReference`. This approach provides a safe and direct way to reference and manipulate specific HTML elements within your interop operations.

Does Blazor Server require special handling for JavaScript interop operations?

Blazor Server requires specific safety handling for JavaScript interop operations. Implementing proper disposal and server safety guidelines ensures that cross-boundary communication remains stable and prevents memory leaks in server-side scenarios.