CODEWITHSUNDEEP
node.js
Gabriel Llamas
Gabriel Llamas

Reputation: 18427

How to erase characters printed in console

I've been searching how to do it in other languages and I've found that I have to use the special character \b to remove the last character. (how-do-i-erase-printed-characters-in-a-console-applicationlinux)

This doesn't work for node.js in multiple calls to console.log ();

If I write a single log:

console.log ("abc\bd");

I get the result: abd

But if I write:

console.log ("abc");
console.log ("\bd");

I get the result:

abc
d

My goal is to print a waiting message like:

Waiting
Waiting.
Waiting..
Waiting...

and again:

Waiting
Waiting.
etc

all in the same line.

Upvotes: 85

Views: 57345

Answers (6)

Lolo
Lolo

Reputation: 53

Using a Carriage Return

The carriage return character places the cursor back at the beginning of the current line.

process.stdout.write("\r");

This solution worked for me — I only tested it with a single character.

Upvotes: 1

pimvdb
pimvdb

Reputation: 154878

There are functions available for process.stdout:

var i = 0;  // dots counter
setInterval(function() {
  process.stdout.clearLine();  // clear current text
  process.stdout.cursorTo(0);  // move cursor to beginning of line
  i = (i + 1) % 4;
  var dots = new Array(i + 1).join(".");
  process.stdout.write("Waiting" + dots);  // write text
}, 300);

It is possible to provide arguments to clearLine(direction, callback)

/**
 * -1 - to the left from cursor
 *  0 - the entire line // default
 *  1 - to the right from cursor
 */

Update Dec 13, 2015: although the above code works, it is no longer documented as part of process.stdin. It has moved to readline

Upvotes: 147

Michael Yurin
Michael Yurin

Reputation: 1060

This works for me:

process.stdout.write('\033c');
process.stdout.write('Your text here');

Upvotes: 3

Sergey Kamardin
Sergey Kamardin

Reputation: 1730

Now you could use readline library and its API to do this stuff.

Upvotes: 20

daremkd
daremkd

Reputation: 8424

Try by moving the \r at the start of the string, this worked on Windows for me:

for (var i = 0; i < 10000; i+=1) {
    setTimeout(function() {
        console.log(`\r ${i}`);
    }, i);
}

Upvotes: -3

jonnysamps
jonnysamps

Reputation: 1086

The easiest way to overwrite the same line is 

var dots = ...
process.stdout.write('Progress: '+dots+'\r');

the \r is the key. It will move the cursor back to the beginning of the line.

Upvotes: 21

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