Javascript, increment a counter on button click - Stack Overflow

In javascript, I want to make a counter that increases the value when you click a button.

When I click the add button the first time, the number doesn't increase.

But when I print the value to the console, the result increases.

The fiddle: /

  $(function() {
    var //valueCount = $("counter").value(),
        counter = $("#counter"),
        addBtn = $("#add"),
        value = $("#counter").html();

      addBtn.on("click", function() {

      counter.html(value ++);  //this value is not incremented.
      console.log(value);      //this value gets incremented.
      return

    });

  });​

How do I make the value show the same for both lines?

In javascript, I want to make a counter that increases the value when you click a button.

When I click the add button the first time, the number doesn't increase.

But when I print the value to the console, the result increases.

The fiddle: http://jsfiddle/techydude/H63As/

  $(function() {
    var //valueCount = $("counter").value(),
        counter = $("#counter"),
        addBtn = $("#add"),
        value = $("#counter").html();

      addBtn.on("click", function() {

      counter.html(value ++);  //this value is not incremented.
      console.log(value);      //this value gets incremented.
      return

    });

  });​

How do I make the value show the same for both lines?

• javascript
• counter
• increment

Share Improve this question Follow edited Jul 7, 2013 at 0:08 Eric Leschinski 154k9696 gold badges422422 silver badges337337 bronze badges asked Nov 11, 2012 at 4:58 TechyDudeTechyDude 1,16544 gold badges1616 silver badges2424 bronze badges 0

Add a ment  | 

4 Answers 4

Sorted by: Reset to default 3

You are doing a Post Increment. Make it pre-increment:

addBtn.on("click", function() {
  counter.html(++value);
  console.log(value);
  return
});

Explanation:

// Increment operators
x = 1;
y = ++x;    // x is now 2, y is also 2
y = x++;    // x is now 3, y is 2

// Decrement operators
x = 3;
y = x--;    // x is now 2, y is 3
y = --x;    // x is now 1, y is also 1

do you mean:

addBtn.on("click", function() {
    counter.html(++value);
    return;          
});

use

 value = parseInt($("#counter").html());

LIVE jSFiddle

  $(function() {
    var //valueCount = $("counter").value(),
        counter = $("#counter"),
        addBtn = $("#add"),
        value =    parseInt($("#counter").html());


    addBtn.on("click", function() {

      counter.html(++value );
      console.log(value);
      return

    });

  });

Try this:

  $(function() {
    var //valueCount = $("counter").value(),
        counter = $("#counter"),
        addBtn = $("#add"),
        value = $("#counter").html();


    addBtn.on("click", function() {

      counter.html(++value);
      console.log(value);
      return

    });

  });

Take a look in this link about the operator description of ++ in JavaScript.

Only one line actually changed; however, here is the fiddler link if you want to test it.