jquery - Run javascript function only once

Question

I have this simple javascript function:

<script type="text/javascript">
    var popup = '0';
    if(popup == '0') {
       $(document).ready(function () {     
            $(document).on('click', '.button', function(){
                  alert('test');
                  popup = '1';
            });
       }); 
    }
</script>

<button class="button">Test</button>

I want the function to alert only on the first click but it keeps working although I changed the value of popup to 1

Answer 1

What you need is .one() function. It makes sure the code is triggered only once for you.

Docs: http://api.jquery.com/one/

Docs example:

$( "#foo" ).one( "click", function() {
  alert( "This will be displayed only once." );
});