CODEWITHSUNDEEP
javascriptreactjs
Hakan Karaduman
Hakan Karaduman

Reputation: 149

Passing parameters to a props function in React

I wrote two sample components to show what I'm trying to do. If the call was from the same class, I could do like below.

onClick={this.myFunc.bind(this, param1, param2)}

How do I do the same thing from a stateless component without the need to mess with binding 'this'.

onClick={props.onClick['need to add params']}


import React from 'react';
 
class BigComponent extends React.Component{
    constructor(props){
        super(props);
        this.handleClick = this.handleClick.bind(this);
    }
    
    handleClick(param1, param2){
        // do something with parameters
    }

    render(){
        return(
            <div>
                <SmallComponent handleClick={this.handleClick}/>
            </div>
        );
    }
}

function SmallComponent(props){
	return(
        <div>
            <button onClick={ () => {props.handleClick('value_1', 'value_2')}}></button>
            <button onClick={ () => {props.handleClick('value_3', 'value_4')}}></button> 
            {/* how to do above without arrow functions, because I read that it's not optimized*/}
        </div>
    );
}

Upvotes: 3

Views: 13502

Answers (1)

pkuzhel
pkuzhel

Reputation: 337

Add a callback inside of this.myFunc.

this.myFunc = event => (param1, param2) => { ... do stuff }

In your top level component you can do:

handleClick={this.myFunc}

In your child, just do:

onClick={handleClick(param1, param2)}

Hope this is helps.

Alternatively you can do the following:

function SmallComponent(props){
    const handleClick = (param1, param2) => (event) => props.handleClick(param1, param2);

    return(
        <div>
            <button onClick={handleClick(param1, param2)}></button>
            ...
    );
}

Upvotes: 4

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