react-auto-bind

Automatically bind methods to their class instance. This is optimized for react. It doesn't bind render and other lifecycle methods.

Install

$ npm install --save react-auto-bind

Usage

const autoBind = require('react-auto-bind');

class Unicorn {
    constructor(name) {
        this.name = name;
        autoBind(this);
    }
    message() {
        return `${this.name} is awesome!`;
    }
}

const unicorn = new Unicorn('Rainbow');

// Grab the method off the class instance
const message = unicorn.message;

// Still bound to the class instance
message();
//=> 'Rainbow is awesome!'

// While message() would not be bound & would have resulted in
message();
//=> Error: Cannot read property 'name' of undefined

Bind only some methods

const autoBind = require('react-auto-bind');

class Griffin {
    constructor(name) {
        this.name = name;
        autoBind(this, 'amaze');
    }
    amaze() {
        return `${this.name} is amazing!`;
    }
    message() {
        return `${this.name} is undefined!`;
    }
}

const buckbeak = new Griffin('Buckbeak');

// Grab the method off the class instance
const message = buckbeak.message;
const amaze = buckbeak.amaze;

// Still bound to the class instance
amaze();
//=> 'Buckbeak is amazing!'

// Without `autoBind(this)`, the above would have resulted in
message();
//=> Error: Cannot read property 'name' of undefined

API

autoBind(self, [...bindOnly])

Bind methods in self to their class instance. Returns the self object.

self

Type: Object

Object with methods to bind.

bindOnly

Type: Strings

If more than one parameters are passed then only those methods are bound.

Related

• bind-methods - Bind all methods in an object to itself or a specified context
• auto-bind - Automatically bind all methods to their class instance.