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A Simple Form Validation Script

Article by:

Syed Zulfi (5/19/2003)

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Summary:

A Simple Javascript function which validates the data in the html forms.

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A Simple Form Validation Script

The Javascript Form Object Properties and Methods can be used to Validate the Html Form.The Multiple Forms in the Html Page are Held as Forms Array.The Javascript Forms Array also holds Information about each Object within the Form tag.

Select All Code


<HTML>
<HEAD>
<TITLE>Form Validation Example </TITLE>
<SCRIPT LANGUAGE="JavaScript">
<!--
function validateForm()
{
var count=0;
var msg="";

    for(i=0;i<=4;i++)
    {
        if(document.UD.elements[i].value=="")
        {
        count=1;
        msg=msg+"\n"+document.UD.elements[i].name;
        }
        else if((i>3) && (count==0))
        {
            return(true);
        }
    }
    for(i=0;i<=4;i++)
    {
        if(document.UD.elements[i].value=="")
        {
        alert("PLEASE FILL IN THE FOLLOWING FIELD(S)\n "+msg);
        document.UD.elements[i].focus();
        return(false);
        }

    }


}
//-->
</SCRIPT>
</HEAD>

<BODY>
<CENTER>
<FONT SIZE="5" COLOR="#006600" FACE="verdana">Form Validation</FONT>
</CENTER><BR><BR>
<FORM METHOD=POST ACTION="http://www.mysite.com" NAME="UD">
<TABLE ALIGN="CENTER">
<TR>
    <TD>First Name</TD>
    <TD><INPUT TYPE="TEXT" NAME="FIRST NAME"></TD>
</TR>
<TR>
    <TD>Last Name</TD>
    <TD><INPUT TYPE="TEXT" NAME="LAST NAME"></TD>
</TR>
<TR>
    <TD>Date of Birth</TD>
    <TD><INPUT TYPE="TEXT" NAME="DATE OF BIRTH"></TD>
</TR>
<TR>
    <TD>Email</TD>
    <TD><INPUT TYPE="TEXT" NAME="EMAIL"></TD>
</TR>
<TR>
    <TD><INPUT TYPE="SUBMIT" VALUE="Submit Form"
    onClick="return validateForm()"></TD>
    <TD><INPUT TYPE="RESET" VALUE="Reset"></TD>
</TR>
</TABLE>
</FORM>
</BODY>
</HTML>

The Multiple Forms in the Html page can be accessed by refering to its Array Index. document.forms[0] refers to the First Form in the Html Page.Similarly the Elements within the Form Tag can be accessed by refering to the elements Array Index. document.forms[0].elements[0] refers to the First element in the First Form in the Html Page.
In the Above Example,the function 'validateForm()' has two loops.The first loop runs thru all the elements in the form and if it encounters any empty elements it append the field name to the message.The Second loop runs thru all the form elements and alerts the user to fill the empty field.

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User Comments on 'A Simple Form Validation Script'

Posted by : Archive Import (jeelani shaik) at 13:13 on Saturday, May 24, 2003

great script buddy...
keep coding

Posted by : Archive Import (Agnes) at 23:54 on Sunday, August 03, 2003

yeah ... really simple ... but can't validate the values e.g. email validation ...

Posted by : Archive Import (paul) at 18:31 on Wednesday, August 20, 2003

wikkid script i would like something like this :)

Posted by : Archive Import (javadym) at 07:14 on Sunday, September 07, 2003

Hello

I'am software engineering

and Like javaScript Programing

Please send me Simple javascript that

insert and update to xml file

Tanks.

Posted by : apurva_007 at 01:00 on Thursday, March 11, 2004

nice script.. keep up the good work

Posted by : pixelhub at 08:38 on Tuesday, April 13, 2004

Hi

is there any way i can skip a field(s) from being checked.

thanks

Posted by : rubyarasi at 05:19 on Friday, September 29, 2006

Hi,
I am an engineering student doing my project in Jsp...
Could you please send me the jsp code to connect the textfields in a form to the database(Ms-Access)..

Posted by : cg at 10:25 on Monday, June 18, 2007

is there any way i can skip a field(s) from being checked?

Posted by : SweetKillerBunny at 15:38 on Wednesday, September 30, 2009

This helped me with a problem I had validating a form.

Thanks.

Posted by : nancy16788 at 09:41 on Wednesday, October 07, 2009

hi,
i am doing a casestudy on "Birds is different countries".i have created a text box and if i give a bird name it must display the page in which it contains the details of the bird.....i need an idea of how validation can be done using javascript.

thank you.

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