How to loop through and display buttons that have an onClick and pass a different variable to another function?

Question

I have the following ReactJS code which I am using to render a number of buttons which will allow the user to navigate around the data returned from an API (a bunch of paginated images).

I have the multiple buttons displaying but they send i as 19 (the end value in the loop) to the handlePageClick() function.

How can I get the value of i to be passed to my handlePageClick() function?

handlePageClick( button ) {

    console.log( button );

    this.setState( prevState => {
        return {
            currentPage: button
        }
    }, () => {
        this.loadMedia();
    });

}

render() {

    // figure out number of pages

    const mediaButtonsNeeded = parseInt( this.state.totalMedia / this.state.perPage )

    var mediaButtons = [];
    for (var i = 0; i < mediaButtonsNeeded; i++) {
        mediaButtons.push(<button  onClick={() => this.handlePageClick(i)}>{i}</button>);
    }


    return (

        <div>

            <div>
                <h1>Media test</h1>
                {media}
                {mediaButtons}
            </div>

        </div>

    )

Artem Mirchenko · Accepted Answer · 2019-05-15 12:03:37Z

2

Since var is global scope variable declaration, your loop always rewrite i to next value.

Easiest solution is just replacing from var to let.

 for (let i = 0; i < mediaButtonsNeeded; i++) {// your code...

answered May 15, 2019 at 12:03

Artem Mirchenko

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Comments

François Huppé · Accepted Answer · 2019-05-15 12:05:25Z

0

This should work:

for (var i = 0; i < mediaButtonsNeeded; i++) {
        mediaButtons.push(<button  onClick={() => this.handlePageClick(i+"")}>{i}</button>);
}

answered May 15, 2019 at 12:05

François Huppé

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