Stopping submit if form invalid

[Iceman Luch]

I wrote a form and a JavaScript to valid the form. I cannot figure out however how to stop the form from submitting if the form is invalid.

[CODE]
function validateForm()
{

if(""==document.test.custName.value)
{
alert("Please enter your name.");
return false;
}

if(""==document.test.email.value)
{
alert("Please enter your email address.");
return false;
}

if(""==document.test.custComment.value)
{
alert("Please enter your comment.");
return false;
}

return true;
}
[CODE]

[DJCMBear]

Try putting the if's the other way around.

if(document.test.custComment.value === "")

EXAMPLE:

function validateForm() {
  var e=false,w=[];
  if(document.test.custName.value === '') {
    w[0] = "Please enter your name.";
    e = true;
  }
  if(document.test.email.value === '') {
    w[1] = "Please enter your email address.";
    e = true;
  }
  if(document.test.custComment.value === '') {
    w[2] = "Please enter your comment.";
    e = true;
  }
  if(e) {
    alert(w.join("\n"));
    return false;
  }
}

EDIT:
Are you using the function in a button onclick action or the form onsubmit action?

[jmrker]

Originally Posted by Iceman Luch

I wrote a form and a JavaScript to valid the form. I cannot figure out however how to stop the form from submitting if the form is invalid.

function validateForm() {
  if(""==document.test.custName.value) {
    alert("Please enter your name.");
    return false;
  }
  if(""==document.test.email.value) {
    alert("Please enter your email address.");
    return false;
  }
  if(""==document.test.custComment.value) {
    alert("Please enter your comment.");
    return false;
  }
  return true;
}

If using <form> tag:

<form name="my_form" action='' onsubmit="return validateForm">