Question 189131 in Javascript Question posted in
A very good W3school tutorial can be found here.

Calculate the page number on which item is present using javascript

I have 20 items in total, per page 5 items

How to calculate the page number if know id of item in general using javascript.

Possible formula or way to calculate the page number by id value

example:

let itemsTotal = 20;
let perPage = 5;
let itemId=25;
let pageForThisProduct = Math.ceil(itemId/itemsTotal);
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2

Answers


  1. 0

    You’re close. You don’t divide the current item in the list by the number of items – you divide the current item by the number of items allowed per page (or limit).

    function getPageNum(item, limit = 5) {
  return Math.ceil(item / limit);
}

console.log(`Item 1 is on page ${getPageNum(1)}`);
console.log(`Item 5 is on page ${getPageNum(5)}`);
console.log(`Item 7 is on page ${getPageNum(7)}`);
console.log(`Item 10 is on page ${getPageNum(10)}`);
console.log(`Item 13 is on page ${getPageNum(13)}`);
console.log(`Item 15 is on page ${getPageNum(15)}`);
console.log(`Item 16 is on page ${getPageNum(16)}`);
console.log(`Item 20 is on page ${getPageNum(20)}`);
console.log(`Item 21 is on page ${getPageNum(21)}`);
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  2. 0

    You can use the following code to get the page number based on ID:

    let itemsTotal = 20;
let perPage = 5;
let itemId = 25;
let pageForThisProduct = Math.ceil(itemId / perPage);

    The variable pageForThisProduct will store the page number and you can display based on your functionality.

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