Call a javascript function before action in html Form

Question

Can I intercept a form submit action and do some JavaScript function before sending it to post/get?

For example:

<form action="something.php" method="post">
     <input type="text" value="Some data"/>
     <input ... ... ... />
     <input type="submit" value="Send"/>

</form>

Is there a way I can call a JavaScript function before calling action when I click the submit button?

javascriptFunction();
//now go to form action...

Answer 1

    <form action="something.php" method="post" onsubmit="return myFunction()">
 <input type="text" value="Some data"/>
 <input ... ... ... />
 <input type="submit" value="Send"/>

<script type="text/javascript">
 function myFunction(){
//do something here
//if you want to submit form
  return true;
//if don't want to submit
  return false;
  } 
</script>

Answer 2

Try to add an onclick event to the button

onclick="yourfunction()"

and submit the form at the end of the function

document.getElementById("yourform").submit()