CODEWITHSUNDEEP
node.js
Jax-p
Jax-p

Reputation: 8531

Readline works only for the first time

I'm using Node's readline but it works only for the first time. At the first try everything works well (answer is logged and readline is closed) but another time it looks like the readline is not being closed (answer is never logged and console is still waiting for my input even if I've already sent it).

I've class in Node.js (using ES6 with Babel and Nodemon) which has readline in constructor.

class SomeClass
{
    constructor(readline) {
        this.readline = readline;
    }

    askPath() {
        this.readline.question('Question: ', (answer) => {
            console.log(answer);
            this.readline.close();
            this.askPath();
        });
    }
}

const rl = readline.createInterface({
    input: process.stdin,
    output: process.stdout
});

let someClass = new SomeClass(rl);
someClass.askPath();

Console looks like:

> Question: answer
> answer
> Question: second answer
> I can still write
> nothing happens...

Upvotes: 2

Views: 494

Answers (1)

Krzysztof Krzeszewski
Krzysztof Krzeszewski

Reputation: 6714

Just don't call the .close() function, inside of your callback as it closes the entire readline interface

askPath() {
    this.readline.question('Question: ', (answer) => {
        console.log(answer);
        this.askPath();
    });
}

As the documentation says:

The rl.close() method closes the readline.Interface instance and relinquishes control over the input and output streams. [source:nodejs.org]

Upvotes: 3

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