CODEWITHSUNDEEP
node.js
Mitul Maheshwari
Mitul Maheshwari

Reputation: 2647

node.js request module, how to pass body of requested url to the next function using step

I want to download a html page & forward the body part of it to the next function. I have used step to serialize the functions. I am using request module for downloading the page. 

    var Step = require('step');
    var request = require('request');

    Step(
     function getHtml() {
    if (err) throw err;
    var url = "my url here";
    request(url, function (error, response, html) {
    // i want to pass the html object to the next function view
    }); 

    },
    function view(err, html) {
    if (err) throw err;
    console.log(html);
    }
    );

If I do request(url, this) then it is passing the whole page data(response & html) to the next function.

How do I change the above code to only pass the html to next function?

Upvotes: 3

Views: 272

Answers (1)

juanpaco
juanpaco

Reputation: 6433

Remember from the Step documentation:

It accepts any number of functions as arguments and runs them in serial order using the passed in this context as the callback to the next step.

So when each step gets called, this is your callback to the next step. But, you're entering a callback with your request call, so this will change by that point. So, we just cache it.

var Step = require('step');
var request = require('request');

Step(
  function getHtml() {
    //if (err) throw err; <----- this line was causing errors
    var url = "my url here"
      , that = this   // <----- storing reference to current this in closure
    request(url, function (error, response, html) {
      // i want to pass the html object to the next function view
      that(error,html)    // <----- magic sauce
    }); 

  },
  function view(err, html) {
    if (err) throw err;
    console.log(html);
  }
);

My additions are on the lines with "<------". Happy coding!

Upvotes: 1

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