Hello,
I am extremely new to Javascript and I am trying to make a simple web
scraper that will get vendor titles from a website (www.zinc.docking.org).
The problem is that I cannot get request() to work inside a for loop (I
still don't understand why I can't do this). One solution someone suggested
was for me to use callback functions. I tried this but now I cannot get the
bodies array to be returned from getZincBody(). I would like some help or
insight as to why I cannot get this array returned.
This is my code:
var request = require('request'),
cheerio = require('cheerio'),
http = require('http');
var numZinc = ["17", "200", "193"], // arbitrary; can be any number/zinc id
bodies = [];
getZincUrls(numZinc);
function getZincUrls(arr){
for(var x=0; x<arr.length; x++){
getZincBody(x);
// get information from the bodies (purchasable catalogs)
}
}
function getZincBody(x) {
var url = 'http://zinc.docking.org/substance/'+numZinc[x];
return request(url, function(err, resp, body){
if (!err && resp.statusCode==200) {
// return body for each url so body can be manipulated in
getZincUrls()
bodies.push(body) // does not work
console.log(body) // displays body properly
}
else{
console.error("Something went wrong!");
}
});
return bodies;
}
Any help is very much appreciated. Thank you.
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