Incrementing the value when button is clicked.

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I am trying to increase the value written on the button starting from 0 and increment till the user stop clicking the button.
For Example: If User clicked the button one time, the value should increase from 0 to 1 and then if clicked again, then the value should be 1 to 2.

What I have tried:

Here is my HTML:

<div class="button">
  <button type="button" class="btn">0</button>
</div>

And my Javascript File:

var buttonTarget = document.getElementsByClassName("btn");
var counter = 0;

function incrementer(){
  buttonTarget.innerHTML = counter.toString();
  counter++;
  return counter;
}

What I am doing wrong? Any help would be appreciated :)

Posted 15-Jan-19 14:44pm

LeWarEnds

Updated 15-Jan-19 18:05pm

v2

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GKP1992 15-Jan-19 22:44pm

Try calling the incrementer function on the button click.

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Bryian Tan · Accepted Answer · 2019-01-15T18:06:00

Here are my comments.

1. As suggested by other member, you need to update the code to hook up the button click event.

2. getElementsByClassName return array of object, assuming you want the code to access the first button, then the code should look like document.getElementsByClassName("btn")[0];

3. The button initial text value is 0 on page load, so on button click, the counter should show 1, either move the counter++; to the top or start the counter from 1

4. You can also update the button to include an id attribute i and the JavaScript to use getElementById method

HTML

<div class="button">
  <button type="button" class="btn" id="btn" onclick="incrementer()">0</button>
</div>

JavaScript

var buttonTarget = document.getElementsByClassName("btn")[0];
var counter = 1;

function incrementer(){
//document.getElementById("btn").innerHTML = counter.toString();
  buttonTarget.innerHTML  = counter.toString();
  counter++;
  return counter;
}

Document.getElementsByClassName() | MDN[^]