How to stop “setInterval” [duplicate]

Answer 1

This is based on CMS's answer. The question asked for the timer to be restarted on the blur and stopped on the focus, so I moved it around a little:

$(function () {
  var timerId = 0;

  $('textarea').focus(function () {
    clearInterval(timerId);
  });

  $('textarea').blur(function () {
    timerId = setInterval(function () {
     //some code here 
    }, 1000);
  });
});