Validate input to be only positive integer number - is there a simple script (build in JavaScript function)? RSS

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  Naom

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  Validate input to be only positive integer number - is there a simple script (build in JavaScript...

  Apr 30, 2009 05:31 PM|LINK

  Hi everybody,

  I have the following JavaScript

  /*ValidateDate
    This functions accepts a date string in the form MM/DD/CCYY and
   Checks wether the date is valid. If the passed string is not formated
   correctly it will be invalid.
   The function always checks for '/' or '-' as a separator character in
   addition to the passed separator character.
   
   
   Parameters:
    tcDate    - The date string you want to verify
    toControl   - The control object that is assosiated with the date
    tcUserMsg   - Massage to display if validation fails. Leave blank if you don't want to notify the user.
    tlStayOnF   - Stay (don't loose focus) on control if validation fails
    tlAllowBlank - Allow blank tcDate passed
    tlBlankOnF  - Blank control value if validation fails
    tcSepChar   - Separator Character i.e. '/' or '-' or whatever default is '/'
    
   Return:      true or false

   Author: Einar Kvandahl
   Date: 1/26/2004                                 */
  function ValidateDate (tcDate,toControl,tcUserMsg,tlStayOnF,tlAllowBlank,tlBlankOnF,tcSepChar)
  {
   focusField=toControl; // Global variable to fix a bug with focus in Firefox when called after an alert.

   if (tlAllowBlank && tcDate.length==0)
   {
    return true
   }
   
   if (tcSepChar==undefined || tcSepChar=='' || tcSepChar.length > 1)
   {
    tcSepChar = '/';
   }
   
   if (tcUserMsg == 'default')
   {
    tcUserMsg = 'Invalid Date. Please enter valid date in the form (MM'+tcSepChar+'DD'+tcSepChar+'YYYY)';
   }
   
   // Check if the date is on the form MM/DD/CCYY
   firstslash = tcDate.indexOf("/");
   secondslash = tcDate.indexOf("/",firstslash+1);
   
   // Check if the date is on the form MM-DD-CCYY
   if ( firstslash == -1 && secondslash == -1 )
   {
    firstslash = tcDate.indexOf("-");
    secondslash = tcDate.indexOf("-",firstslash+1);
   }
   
   // Check if the date is on the form MM'tcSepChar'DD'tcSepChar'CCYY
   if ( firstslash == -1 && secondslash == -1 )
   {
    firstslash = tcDate.indexOf(tcSepChar);
    secondslash = tcDate.indexOf(tcSepChar,firstslash+1);
   }
   
   if ( firstslash == -1 || secondslash == -1 )
   {
     if (!(toControl==undefined || toControl=='') && tlBlankOnF){toControl.value = ""}
    if (!(tcUserMsg==undefined || tcUserMsg=='')){alert(tcUserMsg)}
    if (!(toControl==undefined || toControl=='') && tlStayOnF){setTimeout("focusField.focus();",1);}
    return false
   }
   else
   {
    // separate month, day and year from the string
    cMonth = tcDate.substring(0,firstslash);
    cDay = tcDate.substring(firstslash+1,secondslash);
    cYear = tcDate.substring(secondslash+1,tcDate.length);
    
    // add 0 before if only one digit for the month is given
    if (cMonth.length == 1){cMonth = "0"+cMonth};
    
    // add 0 before if only one digit for the day is given
    if (cDay.length == 1){cDay = "0"+cDay};
    
    // if only two digits for the year is given assume that it is 2000 something 
    if (cYear.length == 2){cYear = "20"+cYear};
   
    // Warning! the getMonth() function starts with 0 as Jan 
     var test = new Date(cYear,cMonth-1,cDay);
    if ( (test.getFullYear() == cYear) &&
        (cMonth == test.getMonth()+1) &&
        (cDay == test.getDate()) )
     {
      if (!(toControl==undefined || toControl==''))
     {
      toControl.value = cMonth+tcSepChar+cDay+tcSepChar+cYear;
      return true
     }
    }
     else
     {
      if (!(toControl==undefined || toControl=='') && tlBlankOnF){toControl.value = ""}
     if (!(tcUserMsg==undefined || tcUserMsg=='')){alert(tcUserMsg)}
     if (!(toControl==undefined || toControl=='') && tlStayOnF){setTimeout("focusField.focus();",1);}
     return false
    }
   }
  }

  I need to create something similar (unless built-in function exists) that would validate an input to be positive integer number. Any ideas?

  Thanks a lot in advance.

  Beware of bugs in the above code; I have only proved it correct, not tried it.
  (Donald Knuth)
  
  Visit my blog
  
  Microsoft Community Contributor 2011-12
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  om_prakashp

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  Re: Validate input to be only positive integer number - is there a simple script (build in JavaSc...

  Apr 30, 2009 05:39 PM|LINK

  Javascript to check for Positive numbers:

  function CheckPositive()
  {
   if(parseInt(document.getElementById('TEXTBOX').value) > 0)
    alert('Number is positive');
   else
    alert('Number is not positive');

  }
  

  Om Prakash
  • Marked as answer by Naom on Apr 30, 2009 08:41 PM
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  budugu

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  Re: Validate input to be only positive integer number - is there a simple script (build in JavaSc...

  Apr 30, 2009 05:54 PM|LINK

  Naom

  I need to create something similar (unless built-in function exists) that would validate an input to be positive integer number. Any ideas?

  Here is one of doing with regex.. 

  <script type = "text/javascript" language = "javascript">
  
  
  function CheckTextBox(i)
  {
      if(i.value.length>0)
      {
      i.value = i.value.replace(/[^\d]+/g, '');
      }
  }
  
  
  </Script>

    

  //In Code behind add this function to "onkeyup" event for TextBox 
  
  TextBox1.Attributes.Add("onkeypress", "CheckTextBox(this)"); 
  

   

  Vijay Kodali || My Blog
  
  "Don't be afraid to be wrong; otherwise you'll never be right."
  • Marked as answer by Naom on Apr 30, 2009 08:41 PM
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  Naom

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  Re: Validate input to be only positive integer number - is there a simple script (build in JavaSc...

  Apr 30, 2009 05:59 PM|LINK

  I see, the second function removes all entries except for positive digits from the user input. I'm going to try ParseInt, right now writing the adaptation on this using as much of original ValidateDate function as possible.

  Thank you both, give me some time to try it out. 

   

  Beware of bugs in the above code; I have only proved it correct, not tried it.
  (Donald Knuth)
  
  Visit my blog
  
  Microsoft Community Contributor 2011-12
  • Edited by Naom on Apr 30, 2009 06:00 PM
  • Edited by Naom on Apr 30, 2009 08:41 PM
  • Edited by Naom on Apr 30, 2009 08:41 PM
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  Naom

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  Re: Validate input to be only positive integer number - is there a simple script (build in JavaSc...

  Apr 30, 2009 07:11 PM|LINK

  Thanks a lot, parseInt did the trick.

  Beware of bugs in the above code; I have only proved it correct, not tried it.
  (Donald Knuth)
  
  Visit my blog
  
  Microsoft Community Contributor 2011-12
  • Edited by Naom on Apr 30, 2009 08:42 PM