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use-js-interop

Add, review, or fix JavaScript interop in Blazor components. USE FOR: calling JavaScript from Blazor, calling .NET from JavaScript, collocated .razor.js modules, IJSRuntime, IJSObjectReference lifecycle, DotNetObjectReference, ElementReference, timing rules for when JS is available, IAsyncDisposable disposal of JS references, server-side JS interop safety. DO NOT USE FOR: general Blazor component authoring without JS interop needs (use author-component), forms (use collect-user-input).

plugins/dotnet-blazor/skills/use-js-interop/SKILL.md

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Nov 8, 2026
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# JS Interop in Blazor

## 1. Collocated JS Modules

Always use collocated `.razor.js` files with `export` — never global `window.*` functions or `<script>` tags.

```javascript
// ChartPanel.razor.js — placed next to ChartPanel.razor
export function initialize(canvas, dotNetRef) { /* ... */ }
export function updateData(points) { /* ... */ }
export function dispose() { /* ... */ }
```

Import paths: same project = `"./Components/ChartPanel.razor.js"`, RCL = `"./_content/{AssemblyName}/..."`.