Push numbers into array on click event

Question

I'm trying to build a calculator and at this point, need to "collect" any numbers that get clicked in an array. Right now I'm unsure of where to build that array (should it be in a different function all together?). I think I'll need to use .push(), but know I need to use it on an array and am not sure where to define that. When I console.log(gridItems), clearly I get everything, but only want the numbers...

/*Calculator 

function add(n, x) {
  return n + x;
}
console.log(add(3, 8));

function subtract(n, x) {
  return n - x;
}
console.log(subtract(3, 8));

function multiply(n, x) {
  return n * x;
}
console.log(multiply(3, 8));

function divide(n, x) {
  return n / x;
}
console.log(divide(3, 8));*/

// console.log number when button is clicked

function getValue(e){
  var divValue = parseInt(e.target.textContent);
    console.log(divValue);
   }

function numberTrack() {
  
  var gridItems = document.getElementsByClassName('grid');

  for (var i = 0; i < gridItems.length; i ++) {
      gridItems[i].onclick = getValue;
  }
}

numberTrack();

#grid-container {
  width: 200px;
}

.grid {
  width: 50px;
  height: 50px;
  display: inline-block;
  text-align: center;
}

.gray {
  background-color: #ccc;
}

.pink {
  background-color: pink;
}

<!DOCTYPE html>
<html>
<head>
  <meta charset="utf-8">
  <title>JS Bin</title>
  <div id="grid-container" data-value="1">
    <div class="grid gray">0</div>
    <div class ="grid pink">1</div>
    <div class="grid gray">2</div>
    <div class ="grid pink">3</div>
    <div class="grid gray">4</div>
    <div class ="grid pink">5</div>
    <div class="grid gray">6</div>
    <div class ="grid pink">7</div>
    <div class="grid gray">8</div>
    <div class ="grid pink">9</div>
  </div>
  </head>
<body>

</body>
</html>

It depends where you will use that array, will you need to use it in several other functions? If so you can just make it global. — Spencer Wieczorek
– Spencer Wieczorek, Commented Nov 18, 2015 at 18:14
Well, I want to push the numbers to an array for storage and will need to convert them to integers to later do math on them. I'm thinking this will be a separate function.... — CrystalH
– CrystalH, Commented Nov 18, 2015 at 18:16
What about just converting them before you store them? Something like myArray.push(+divValue) or myArray.push(parseInt(divValue))? — Spencer Wieczorek
– Spencer Wieczorek, Commented Nov 18, 2015 at 18:18
OP is already converting them before storing. divValue is an integer because of parseInt() — Adjit
– Adjit, Commented Nov 18, 2015 at 18:19
I'm a bit new to this, so could you explain (+divValue)? I don't know what the + does. — CrystalH
– CrystalH, Commented Nov 18, 2015 at 18:19

Long Nguyen · Accepted Answer · 2015-11-18 18:39:43Z

1

You can define it in global scope like this:

var clickedNumbers = []

function getValue(e) {
    var divValue = parseInt(e.target.textContent);
    clickedNumbers.push(divValue);
}

function numberTrack() {
    var gridItems = document.getElementsByClassName('grid');

    for (var i = 0; i < gridItems.length; i++) {
        gridItems[i].onclick = getValue;
    }
}

numberTrack();

Then push clicked number to array clickedNumbers by clickedNumbers.push(divValue)

edited Nov 18, 2015 at 18:39

answered Nov 18, 2015 at 18:17

Long Nguyen

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1 Comment

CrystalH Over a year ago

Thank you! I was playing around with something like this, but could not get it to work! I had defined my array inside getValue (not sure if that has anything to do with it) and don't think I was using .push() properly.

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