@loopback/docs/site/apidocs/context.contextview.observe.md

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---
lang: en
title: 'API docs: context.contextview.observe'
keywords: LoopBack 4.0, LoopBack 4, Node.js, TypeScript, OpenAPI
sidebar: lb4_sidebar
editurl: https://github.com/loopbackio/loopback-next/tree/master/packages/context
permalink: /doc/en/lb4/apidocs.context.contextview.observe.html
---

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[Home](./index.md) &gt; [@loopback/context](./context.md) &gt; [ContextView](./context.contextview.md) &gt; [observe](./context.contextview.observe.md)

## ContextView.observe() method

Listen on `bind` or `unbind` and invalidate the cache

**Signature:**

```typescript
observe(event: ContextEventType, binding: Readonly<Binding<unknown>>, context: Context): void;
```

## Parameters

<table><thead><tr><th>

Parameter


</th><th>

Type


</th><th>

Description


</th></tr></thead>
<tbody><tr><td markdown="1">

event


</td><td markdown="1">

[ContextEventType](./context.contexteventtype.md)


</td><td markdown="1">


</td></tr>
<tr><td markdown="1">

binding


</td><td markdown="1">

Readonly&lt;[Binding](./context.binding.md)<!-- -->&lt;unknown&gt;&gt;


</td><td markdown="1">


</td></tr>
<tr><td markdown="1">

context


</td><td markdown="1">

[Context](./context.context.md)


</td><td markdown="1">


</td></tr>
</tbody></table>

**Returns:**

void