JavaScript validation

Hi Experts,
How could I have only one alert window pop up if the fields are left empty?
The way it is now the alert window pops up three times when all three fields are left empty.
<script type="text/javascript">
<!--
function validate_form ( )
{
	valid = true;

        if ( document.OT_Request.Phone1.value == "" )
        {
                alert ( "Please enter your 'Area Code'." );
                valid = false;
        }

        if ( document.OT_Request.Phone2.value == "" )
        {
                alert ( "Please enter the first three digits of your  'Phone Number'." );
                valid = false;
        }

        if ( document.OT_Request.Phone3.value == "" )
        {
                alert ( "Please enter the last four digits of your  'Phone Number'." );
                valid = false;
        }

        return valid;
}

//-->

</script>

Open in new window

Thank you for your help.
romsomIT DeveloperAsked:
Who is Participating?
I wear a lot of hats...

"The solutions and answers provided on Experts Exchange have been extremely helpful to me over the last few years. I wear a lot of hats - Developer, Database Administrator, Help Desk, etc., so I know a lot of things but not a lot about one thing. Experts Exchange gives me answers from people who do know a lot about one thing, in a easy to use platform." -Todd S.

Ahmed MerghaniSoftware EngineerCommented:
Try this:
<script type="text/javascript">
<!--
function validate_form ( )
{
	valid = true;

        if ( document.OT_Request.Phone1.value == "" )
        {
                alert ( "Please enter your 'Area Code'." );
                valid = false;
        }

        if ( document.OT_Request.Phone2.value == ""  && valid == true)
        {
                alert ( "Please enter the first three digits of your  'Phone Number'." );
                valid = false;
        }

        if ( document.OT_Request.Phone3.value == ""  && valid == true )
        {
                alert ( "Please enter the last four digits of your  'Phone Number'." );
                valid = false;
        }

        return valid;
}

//-->

</script>
                                  

Open in new window

Julian HansenCommented:
Just add else to your 2nd and 3rd if like so
<script type="text/javascript">
<!--
function validate_form ( )
{
	valid = true;

        if ( document.OT_Request.Phone1.value == "" )
        {
                alert ( "Please enter your 'Area Code'." );
                valid = false;
        }

        else if ( document.OT_Request.Phone2.value == "" )
        {
                alert ( "Please enter the first three digits of your  'Phone Number'." );
                valid = false;
        }

        else if ( document.OT_Request.Phone3.value == "" )
        {
                alert ( "Please enter the last four digits of your  'Phone Number'." );
                valid = false;
        }

        return valid;
}

//-->

</script>
                                  

Open in new window

Experts Exchange Solution brought to you by

Your issues matter to us.

Facing a tech roadblock? Get the help and guidance you need from experienced professionals who care. Ask your question anytime, anywhere, with no hassle.

Start your 7-day free trial
Albert Van HalenAnalyst developerCommented:
Or display all messages in one alert
function validate_form ( )
{
	var msgs = [];

        if ( document.OT_Request.Phone1.value == "" )
                msgs.push ( "Please enter your 'Area Code'." );

        if ( document.OT_Request.Phone2.value == "" )
                msgs.push ( "Please enter the first three digits of your  'Phone Number'." );

        if ( document.OT_Request.Phone3.value == "" )
                msgs.push ( "Please enter the last four digits of your  'Phone Number'." );

	if ( msgs.length > 0 ) {
		alert ( msgs.join ( "\n" ) );
		return false;
	}

        return true;
}

Open in new window

Big Business Goals? Which KPIs Will Help You

The most successful MSPs rely on metrics – known as key performance indicators (KPIs) – for making informed decisions that help their businesses thrive, rather than just survive. This eBook provides an overview of the most important KPIs used by top MSPs.

romsomIT DeveloperAuthor Commented:
Thank you very much all of you!
romsomIT DeveloperAuthor Commented:
Albert, I really like your solution, thank you very much
Julian HansenCommented:
You are welcome - good luck with your project.
It's more than this solution.Get answers and train to solve all your tech problems - anytime, anywhere.Try it for free Edge Out The Competitionfor your dream job with proven skills and certifications.Get started today Stand Outas the employee with proven skills.Start learning today for free Move Your Career Forwardwith certification training in the latest technologies.Start your trial today
JavaScript

From novice to tech pro — start learning today.