How to insert a newline character after every 200 characters with jQuery

Question

I have a textbox that I use to insert some information. I want to insert a newline character after every 200 characters using jQuery or JavaScript.

For instance:

aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa
aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa
aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa
aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa

In this example, I want to insert a newline chracter after every 200 characters. How can I do this?

Answer 1

Break the string after every 200 characters, add a newline, and repeat this process with the remaining string:

function addNewlines(str) {
  var result = '';
  while (str.length > 0) {
    result += str.substring(0, 200) + '\n';
    str = str.substring(200);
  }
  return result;
}