How do I listen for triple clicks in JavaScript?

it's very simple if you do it right, and you can even catch single, double, triple, ... clicks as you like. plain javascript, customizable click delay (timeout):

var clicks = 0;
var timer, timeout = 350; // time between each click

var doubleClick = function(e) {
  console.log('doubleClick');
}

var tripleClick = function(e) {
  console.log('tripleClick');
}

// click timer
yourcontainer.addEventListener('click', function(e) {
  clearTimeout(timer);
  clicks++;
  var evt = e;
  timer = setTimeout(function() {
    if(clicks==2) doubleClick(evt);
    if(clicks==3) tripleClick(evt);
    clicks = 0;
  }, timeout);
});

Configurable n-clicks event detector factory

const nClicks = (minClickStreak, maxClickInterval = 500, resetImmediately = true) => {
  let timerId = 0
  let clickCount = 0
  let lastTarget = null
  const reset = () => {
    timerId = 0
    clickCount = 0
    lastTarget = null
  }
  
  return (originalEventHandler) => (e) => {
    if (lastTarget == null || lastTarget == e.target) { // 2. unless we clicked same target
      clickCount++ // 3. then increment click count
      clearTimeout(timerId)
    }
    lastTarget = e.target
    timerId = setTimeout(reset, maxClickInterval) // 1. reset state within set time
    if (clickCount >= minClickStreak) {
      originalEventHandler(e)
      if (resetImmediately) {
        clickCount = 0
      }
    }
  }
  
}

Usage

  table.addEventListener('click', nClicks(2)(e => { // double click
    selectCell(e.target)
  }))

  table.addEventListener('click', nClicks(3)(e => { // triple click
    selectRow(e.target)
  }))