VueJS this in lodash throttled method

Question

I am trying to throttle a method in my VueJS application. I tried the following at first:

export default {
    data () {
        return {
            foo: 'bar'
        }
    },
    methods: {
        doSomething () {
            console.log('olas')
        }
    },
    created () {
        _.throttle(this.doSomething,200)
    }
}

But the doSomething method was just not fired: https://jsfiddle.net/z4peade0/

Then, I tried this:

export default {
    data () {
        return {
            foo: 'bar'
        }
    },
    methods: {
        doSomething: _.throttle( () => {
            console.log('olas')
        },200)
    },
    created () {
        this.doSomething()
    }
}

And the functiong gets triggered: https://jsfiddle.net/z4peade0/1/

Problem is, I can't access the foo property inside the throttled method:

export default {
    data () {
        return {
            foo: 'bar'
        }
    },
    methods: {
        doSomething: _.throttle( () => {
            console.log(this.foo) // undefined
        },200)
    },
    created () {
        this.doSomething()
    }
}

I tried to do something like:

const self = {
    ...
    methods: {
        doSomething: _.throttle( () => {
            console.log(self.foo) 
        },200)
    },
    ...
}

export default self

without success

How could I use lodash throttled method on a VueJS method, and using this context?

Answer 1

You're using an arrow function, which binds the wrong context (this). You should use a plain function:

    doSomething: _.throttle( function () {
        console.log('olas', this.foo);
    },200)