GSAP Draggable with react ES6 actual this

Question

Im using gsap Draggable with reactjs ES6, I create new draggable like this in react component componentDidUpdate lifecycle method

import React, { Component } from 'react'
import Draggable from 'gsap/Draggable'

class DraggableContainer extends Component {

    render(){
        ...
    }
    componentDidUpdate(){
        const draggable = Draggable.create('.box', {
            onPress: ()=>{
                // currentElement suppost to contain dom element of clicked, but its undefined because 'this' is 'DraggableContainer'
                const currentElement = this.target

            }   
        })
    }
}

inside method body of onPress this.target should give current element but its undefined and this is wrong context.

How can i access current elent inside this method?

Mayank Shukla · Accepted Answer · 2017-05-31T09:29:59.980

You are using arrow function, it will automatically bind the context of that object which will call that method. To access the target element use event object.

In JavaScript, the thing called this, is the object that "owns" the JavaScript code. The value of this, when used in a function, is the object that "owns" the function.

Write it like this to access the target element:

const draggable = Dragable.create('.box', {
   ...,
   onPress:(e) => {
     //now this.target is wrong
     const el = e.target;
   }
})

Check this answer for more details about this keyword.

GSAP Draggable with react ES6 actual this

1 Answers1