Javascript: How do you take user input and store into a variable without any HTML?

Question

I want to ask the user through the console to enter a number. I then want to store it into a variable to have it used for a function etc. Here is an example of what I have done. When i do this it says ReferenceError: readline is not defined

console.log("Enter your guess and press <Enter>: /t" );
var userNumber = readline();

I am just trying to create an interactive js console app for now.

Edit: Here is my source code http://repl.it/NeI/4

Of course readline is not defined. You can't make stuff up :| — user2864740, Jan 14 '14 at 02:08
"console" as in browser's console (does not provide any "read" capabilities) or regular OS console (like CMD in Windows with running script via CScript)? — Alexei Levenkov, Jan 14 '14 at 02:12
For some reason, i thought readline() was a built in function. — Beast_Code, Jan 14 '14 at 02:23
Do you mean a terminal console? If so - then you need to be running this with node.js. — Kelly J Andrews, Jan 14 '14 at 02:49
Also the reason why your code isn't working [here](http://repl.it/NeI/4) is the unresolved while loop... — Kelly J Andrews, Jan 14 '14 at 02:55
i know there is some logical error in the while loop but i cant figure out what the issue is. — Beast_Code, Jan 14 '14 at 03:03

score 12 · Accepted Answer · answered Jan 14 '14 at 02:09

12

Try doing this:

var guess = window.prompt("Enter your guess", "Number from 1 to 9");
console.log(guess);

answered Jan 14 '14 at 02:09

Alex Shilman

1,547
1
11
15

Yeah I wasn't sure about that either – scrblnrd3 Jan 14 '14 at 02:10
Well it's mostly fine, +20-2 is still +18. – scrblnrd3 Jan 14 '14 at 02:11

score 3 · Answer 2 · answered Jan 14 '14 at 02:14

The console does not do what you are hoping it will in this situation.

Here is the API documentation from Mozilla, and here are the Chrome docs.

The console intent is to display information from your application for debugging purposes, with some minor helper functions.

score 0 · Answer 3 · edited May 23 '17 at 10:31

0

Developer tools or Firebug console can't receive user data this way, there's no read or readline methods. You have to use a window method called "prompt" .

var data = prompt("Type something to me baby!");
console.log(data);

Here's another question addressing this same doubt.

edited May 23 '17 at 10:31

Community

1
1

answered Jan 14 '14 at 02:13

Alcides Queiroz

9,456
3
28
43

Javascript: How do you take user input and store into a variable without any HTML?

3 Answers3