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Dynamic Text Using JavaScript?

Posted on 2009-04-08
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Last Modified: 2012-05-06
I am trying to write a portion of my webpage so that when the user enters in a year into a textbox, next to it, the test changes to show the next year.  Ultimately it should liike like a year range, specifically for a school year (ie: 2000 - 2001, 2008 - 2009).  Additionally, I would like to be able to have the "dynamic year" say "[Invalid]" if the user had not typed in a complete year yet.. (ie: 200 - [Invalid]).  Once the user types in 4 digits, then the year range should display properly.

I know VB and and currently writing ASP pages...unfortunately, I am not very familer with JavaScript.  Below is the code I have, but I have no clue how to write the JavaScript part...can anyone help?
<span id="ctl00_MainContent_lblSchoolYear" style="display:inline-block;width:88px;">School-Year Start:</span>

<input name="ctl00$MainContent$txtSchoolYear" type="text" value="0000" maxlength="4" id="ctl00_MainContent_txtSchoolYear" style="width:32px;" />

<span id="ctl00_MainContent_lblSchoolYearRange"> - [EndYear]</span>

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Question by:Ben Santiardo
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3 Comments
 
LVL 41

Accepted Solution

by:
HonorGod earned 500 total points
ID: 24097258
Something like this perhaps?
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01//EN" "http://www.w3.org/TR/html4/strict.dtd">

<html>

<head>

<title> Years </title>

<script type='text/javascript'>

  function field( id ) {

    return document.getElementById( id )

  }
 

  function checkYear( obj, id ) {

    var target = field( id )

    if ( target ) {

      if ( target.nodeName == 'SPAN' ) {

        target = target.firstChild

      }

      if ( obj ) {

        if ( obj.nodeName == 'INPUT' ) {

          var val = obj.value

          var msg = '- [Invalid]'

          if ( /^\d+$/.test( val ) ) {

            if ( val == '0000' ) {

              msg = '- [EndYear]'

            } else {

              if ( val.length == 4 ) {

                msg = '- ' + ( ( val - 0 ) + 1 )

              }

            }

          } else {

            alert( 'checkYear() - non-numeric value entered.' )

          }

          target.nodeValue = msg

        } else {

          alert( 'checkYear() - parameter error. "INPUT" expected, "' + obj.nodeName + '" provided' )

        }

      } else {

        alert( 'checkYear() - parameter error. Document element required.' )

      }

    }

  }

</script>

</head>

<body>
 

<span id="ctl00_MainContent_lblSchoolYear" style="display:inline-block;width:88px;">School-Year Start:</span>

<input name="ctl00$MainContent$txtSchoolYear" type="text" value="0000" maxlength="4" id="ctl00_MainContent_txtSchoolYear" style="width:32px;" onkeyup='checkYear(this,"ctl00_MainContent_lblSchoolYearRange")' />

<span id="ctl00_MainContent_lblSchoolYearRange"> - [EndYear]</span>
 

</body>

</html>

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Author Comment

by:Ben Santiardo
ID: 24097563
PERFECT!!  That was exactly what I needed.
Thank you so much!
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LVL 41

Expert Comment

by:HonorGod
ID: 24097700
You are very welcome.  Thanks for the grade & points.

Good luck & have a great day
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