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validação de formulários - javascript
<HTML>
<HEAD>
<script language="javascript">
<!--
function validateForm()
{
if (document.entryForm.yourname.value=="")
{
alert("You haven't entered your name !");
return false;
}
document.entryForm.submit();
return true;
}
// -->
</script>
</HEAD>
<BODY>
<FORM METHOD=POST ACTION="/servlets/demoServlets.MyNameServlet" NAME="entryForm">
<INPUT TYPE="TEXT" SIZE="30" NAME="yourname">
<INPUT TYPE="BUTTON" VALUE=" Submit " OnClick="validateForm()">
</FORM>
</BODY>
</HTML>
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