20 Dec 2005, 4:02
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mike55
Joined on 01-20-2005
Posts 42
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Javascript + user controls
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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:
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'document.' + FormName + '.' + TextFieldName + '.value';
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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:
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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()
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Mike55.
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