Question

48

Node pagination with express

rated 0 times [ 52] [ 4] / answers: 1 / hits: 24380 / 7 Years ago, wed, december 13, 2017, 12:00:00

I have to build and API as server side, that should provide results in pages of 10 entries, using only Node with express (no other packages).

A query parameter p specifies which page to return, starting with 1. If the p parameter is omitted, the default value is 1.

If the client side asks for /api/stories?p=1, they should only get 10 stories, starting from the newest one.

If p=2, the API must return the second batch of 10 stories.
When a page of stories is returned it must be ordered with the most recent story first.

If p is greater than the last page number, the API must return the last available page.

The page value is the currently returned page. If the requested page p is greater than the last page number, the returned page value will indicate the last page number.

The pageCount value is the number of the last non-empty page.*

This is what I have for pagination...

//pagination

const pageLimit = 10;

app.get('/api/posts', function(req, res) {

  res.json({

    posts: posts.slice(-pageLimit).reverse(),

    page: 1,

    pageCount: Math.ceil(posts.length / 10)

  });

});

The return is correct as 10 posts per page, 11th, 21st, 31st posts are pushed on 2nd ,3rd page etc...
Now my problem comes when I try to advance from page 1 to page 2 (as a next page) nothing happens...

I'm guessing I have to implement something like a a next but I don't have any idea how to do it

Any help would be appreciated...

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benitoh

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4 Years ago

answered 7 Years ago daja · Accepted Answer

after scratching my head 2 days, I found a solution that works for me..Thank you num8er for pointing me in right direction...

app.get('/api/posts', (req, res) => {

  const pageCount = Math.ceil(posts.length / 10);

  let page = parseInt(req.query.p);

  if (!page) { page = 1;}

  if (page > pageCount) {

    page = pageCount

  }

  res.json({

    page: page,

    pageCount: pageCount,

    posts: posts.slice(page * 10 - 10, page * 10)

  });

});