---
lang: en
title: 'API docs: context.binding.on_1'
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.binding.on_1.html
---

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[Home](./index.md) &gt; [@loopback/context](./context.md) &gt; [Binding](./context.binding.md) &gt; [on](./context.binding.on_1.md)

## Binding.on() method

**Signature:**

```typescript
on(event: string | symbol, listener: (...args: any[]) => void): this;
```

## 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">

string \| symbol


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


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

listener


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

(...args: any\[\]) =&gt; void


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


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

**Returns:**

this