How to switch className between different buttons

Question

I want to switch class of buttons when clicked to change its color accordingly. Color of particular button should change on click in react js

I have tried

{"classname" isActive: "included classname"}

here is my code...

const handlePaging=()=> {

    let totalPages = listProduct.length / entriesPerPage;
    let pageNumber = [];

    for (let i = 0; i < totalPages; i++) {

        pageNumber[i] = <li><a href={()=> false} onClick={() => handlePageNumber(i, entriesPerPage)} className={"pagination-link"}>{i+1}</a></li>
    }

    return (pageNumber)
}

const handlePageNumber=(entryNumber, entriesPerPage)=> {

    setEntryStart(entryNumber * entriesPerPage);
    setEntryEnd(((entryNumber+1)*entriesPerPage) < listProduct.length ? ((entryNumber+1)*entriesPerPage) : listProduct.length );
}

I want to add classname is-current to the button which is clicked, I am managing the pagination actually.

Answer 1

You will need some information about which page is selected.

// you need somewhere stored the active page.
let selectedPage = 1;

let totalPages = listProduct.length / entriesPerPage;
let pageNumber = [];

for (let i = 0; i < totalPages; i++) {
    pageNumber[i] = <li>
      <a href={()=> false} 
          onClick={() => handlePageNumber(i, entriesPerPage)} 
          className={"pagination-link " + (i === selectedPage ? "is-current" : "")}>{i+1}</a>
    </li>
}

return (pageNumber)