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>

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Thank you for your help.
romsomIT DeveloperAsked:
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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

0
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

0

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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;
}

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0
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romsomIT DeveloperAuthor Commented:
Thank you very much all of you!
0
romsomIT DeveloperAuthor Commented:
Albert, I really like your solution, thank you very much
0
Julian HansenCommented:
You are welcome - good luck with your project.
0
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