Quickest way to validate form input fields with JS - forms

Question

What is the quickest way to validate al my input fields with javaScript?
I want to check if the fields are filled in or not.
Thx

Answer 1

following is my javascript code :
<script>
function Check(frm)
{
var input, EmptyFound=false;
var elem = document.getElementById('frmMain').elements;
for(var i=0;i<elem.length;i++)
{
input = elem[i];
if(input.type == "text")
{
if(input.value == "")
{
EmptyFound = true;
break;
}
}
return notEmpty;
}
</script>

Answer 2

I would use jQuery Validate.
A single line of jQuery to select the form and apply the validation
plugin. And a bit of metadata on each element to specify the
validation rules.
The docs specifically for enforcing required are at
http://docs.jquery.com/Plugins/Validation/Methods/required
It requires adding jQuery (if you don't use it already) but provides a fast and powerful validation framework.

Answer 3

you can use this to distinguish between input different types
this is just a sample from my project
//var frm_elements = document.mainForm.elements;
//var frm_elements =document.getElementById('mainForm').elements;
for (var i = 0; i < document.mainForm.elements.length; i++)
{document.mainForm.elements[i];
if(document.mainForm.elements[i]!=null)
{
var field_type = document.mainForm.elements[i].type;
switch (field_type)
{
case "text":
if(document.mainForm.elements[i].name.indexOf("from")!='-1' &&
document.mainForm.elements[i].name.indexOf("frotom")!='-1' &&
!document.mainForm.elements[i].name.indexOf("serNo")!='-1' &&
!document.mainForm.elements[i].name.indexOf("repKey")!='-1' &&
!document.mainForm.elements[i].name.indexOf("orderKey")!='-1' &&
!document.mainForm.elements[i].name.indexOf("formatKey")!='-1' )
{
document.mainForm.elements[i].value = "";
}
break;
case "password":
case "textarea":
case "hidden":
/* frm_elements[i].value = "";
break;*/
case "radio":
case "checkbox":
/*if (frm_elements[i].checked)
{
frm_elements[i].checked = false;
}
break;*/
case "select-one":
case "select-multi":
if(document.mainForm.elements[i].name.indexOf("ddlMainSubModule")=='-1')
document.mainForm.elements[i].selectedIndex = 0;
break;
default:
break;
}
}
}