How to target the first id in row - html

Question

I am trying to do web scraping and i would like to display the data in JSON format.
My task is to extract each post from the website and display its relevant data in JSON format. My issue is that i cannot seem to target the row () and then target each id. I can input the id in my code but i would like for the program to seacrh for the id and console log the data of each id in the row.
Example: I want to get the title for the first post by id.
I hope i am making sense.
The website i am trying to extract data from:
My code:
var express = require('express');
var path = require('path');
var request = require('request');
var cheerio = require('cheerio');
var fs = require('fs');
var app = express();
var port = 8080;
var url= "https://news.ycombinator.com/";
request(url, function(err,resp,body){
var $ = cheerio.load(body);
var title = $('tr');
var uri
var author
var points
var comments
var rank
var posts = {
postTitle : title,
postUri : uri,
postAuthor : author,
postPoints : points,
postComments : comments,
postRank : rank
}
console.log(posts)
})
app.listen(port);
console.log('server is listening on' + port);

Answer 1

The trick with hackernews is that three tr elements display one row. Thats why each element of rows inherits three subsequent elements of tr. Inside rows.map each item is one row and you can access the attributes "rowwise".
let cheerio = require('cheerio')
let request = require('request');
const url = "https://news.ycombinator.com/";
request(url, function(err,resp,body){
let $ = cheerio.load(body);
const tr = $('.itemlist > tr');
let rows = Array((tr.length - 2)/3); //the last two are the More button
for (var i = 0; i < (tr.length - 2)/3; ++i){
rows[i] = tr.slice(3*i, 3*(i+1));
}
res = rows.map(function(item, index) {
return {
postTitle: $(item).find('.storylink').text(),
postUri: $(item).find('.storylink').attr('href'),
postComments: $(item).find('a+ a').text(),
}
})
console.log(res);
})
Which gives you:
[ { postTitle: 'CockroachDB beta-20161013',
postUri: 'https://jepsen.io/analyses/cockroachdb-beta-20161013',
postComments: '10 comments' },
{ postTitle: 'Attacking the Windows Nvidia Driver',
postUri: 'https://googleprojectzero.blogspot.com/2017/02/attacking-windows-nvidia-driver.html',
postComments: '7 comments' },
{ postTitle: 'DuckDuckGo Donates $300K to Raise the Standard of Trust Online',
postUri: 'https://spreadprivacy.com/2017-donations-d6e4e4230b88#.kazx95v27',
postComments: '25 comments' },
... ]