Get variable outside module request when asynchronous

Question

Hi I'm trying to get the id variable that it's returned inside request in an asynchronous process using request and cheerio.

I've tried by returning a Promise but that didn't work.

let id;

    request(mainUrl, function(err, res, body) {  
                
        let $ = cheerio.load(body)

        var links= $(".book").map(function(){
            return $(this).attr("href");
        }).get()

           
        var url= links[0]


        var getId= url.match(/book\/show\/(\d+)/)


        id= getId[1]
        //This is the id I'm getting: "36474"
           
        return Promise.resolve(id)

    });


    .then((value)=>{
     console.log(id)

    })

what request lib are you using? looks like you're using a callback-based one, might not support `.then` — Daniel Lizik, Apr 10 '17 at 17:02

score 0 · Answer 1 · answered Apr 10 '17 at 17:05

Ok, I did it:

let id;

let promise= new Promise((resolve, reject)=>{
   request(mainUrl, function(err, res, body) {  
            
      let $ = cheerio.load(body)

      var links= $(".book").map(function(){
       return $(this).attr("href");
     }).get()

       
      var url= links[0]


      var getId= url.match(/book\/show\/(\d+)/)


      id= getId[1]
      //Ex: => "36474"
       

      return resolve(id)

});
})


promise
.then((value)=>{
 console.log(id)

})

Get variable outside module request when asynchronous

1 Answers1