javascript + user controls

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mike55

Contributor
Joined
Mar 26, 2004
Messages
727
Location
Ireland
Hi all,

A standard web page has a opening and closing head, body, and form tag. I have a some javascript, that calculates the number of characters that each user left, given that the user cannot enter more that 254 characters.

The problem that I am new experiencing is that the java script has to reference the id property of the Form tags. Unfortunately no such tags, (from my previous attempts) exists in user controls. I was using the id property to access other controls on the web page, using the following code:

Code: 
  'document.' + FormName + '.' + TextFieldName + '.value';
Is their any possible means of repeating this functionality using the web control. I cannot set the textbox control properties "MaxLength" as the textbo is a multi-line text area. Here is the entire javascript:

Code: 
  var MaximumCharacters = "254";    
  var MaximumWords = "0";    
  var FormName = "usrctrlHistory1";    
  var TextFieldName = "txtComment";    
  var CharactersTypedFieldName = "";    
  var CharactersLeftFieldName = "CharsLeft";    
  var WordsTypedFieldName = "";    
  var WordsLeftFieldName = "";    
  var WordsMonitor = 0;    
  var MaxWords = parseInt(MaximumWords);    
  var MaxChars = parseInt(MaximumCharacters);    
  var textfield = 'document.' + FormName + '.' + TextFieldName + '.value';

  function WordLengthCheck(s,l) {       
    WordsMonitor = 0;       
    var f = false;       
    var ts = new String();       
    for(var vi = 0; vi < s.length; vi++) {          
      vs = s.substr(vi,1);          
      if((vs >= 'A' && vs <= 'Z') || (vs >= 'a' && vs <= 'z') || (vs >= '0' && vs <= '9')) {             
        if(f == false) {                
          f = true;                
          WordsMonitor++;                
          if((l > 0) && (WordsMonitor > l)) {                   
            s = s.substring(0,ts.length);                   
            vi = s.length; WordsMonitor--;                
          }             
        }             
      }          
      else {             
        f = false;          
      }          
      ts += vs;       
    }       
    return s;    
  } // function WordLengthCheck()    

  function CharLengthCheck(s,l) {       
    if(s.length > l) {          
      s = s.substring(0,l);       
    }       
    return s;    
  } // function CharLengthCheck()    

  function InputCharacterLengthCheck() {       
    if(MaxChars <= 0) {          
      return;       
    }       
    var currentstring = new String();       
    eval('currentstring = ' + textfield);       
    var currentlength = currentstring.length;       
    eval('currentstring = CharLengthCheck(' + textfield + ',' + MaxChars + ')');       
    if(CharactersLeftFieldName.length > 0) {          
      var left = 0;          
      eval('left = ' + MaxChars + ' - ' + textfield + '.length');          
      if(left < 0) {             
        left = 0;          
      }          
      eval('document.' + FormName + '.' + CharactersLeftFieldName + '.value = ' + left);          
      if(currentstring.length < currentlength) {             
        eval(textfield + ' = currentstring.substring(0)');          
      }       
    }             
    
    if(CharactersTypedFieldName.length > 0) {          
      eval('document.' + FormName + '.' + CharactersTypedFieldName + '.value = ' + textfield + '.length');          
      if(currentstring.length < currentlength) {             
        eval(textfield + ' = currentstring.substring(0)');          
      }       
    }    
  } // function InputCharacterLengthCheck()    

  function InputWordLengthCheck() {       
    if(MaxWords <= 0) {          
      return;       
    }       
    var currentstring = new String();       
    eval('currentstring = ' + textfield);       
    var currentlength = currentstring.length;       
    eval('currentstring = WordLengthCheck(' + textfield + ',' + MaxWords + ')');       
    if (WordsLeftFieldName.length > 0) {          
      var left = MaxWords - WordsMonitor;          
      if(left < 0) {             
        left = 0;          
      }          
      eval('document.' + FormName + '.' + WordsLeftFieldName + '.value = ' + left);          
      if(currentstring.length < currentlength) {             
        eval(textfield + ' = currentstring.substring(0)');          
      }       
    }       
    if (WordsTypedFieldName.length > 0) {          
      eval('document.' + FormName + '.' + WordsTypedFieldName + '.value = ' + WordsMonitor);          
      if(currentstring.length < currentlength) {             
        eval(textfield + ' = currentstring.substring(0)');          
      }       
    }    
  } // function InputWordLengthCheck()    

  function InputLengthCheck() {       
    InputCharacterLengthCheck();       
    InputWordLengthCheck();    
  } // function InputLengthCheck()

Mike55.
 
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