TextUtil and EventUtil

JasonF430 · December 7th, 2008, 10:59 AM

I'm reading <<Profession javascript for web developers>>.

I have seen for a Script contain "TextUtil" class and "EventUtil" class, but I dont know where are they from?

code fragment:

Code:

TextUtil.allowChars = function(objTextbox, objEvent, blnBloackPaste){
    objEvent = EventUtil.formatEvent(objEvent);

    var strValidChars = objTextbox.getAttribute("validchars");
    var strChar = String.fromCharCode(objEvent.charCode);

    var blnIsValidChar = strValidChars.indexOf(strChar) > -1;

    if(blnBloackPaste){
        return blnIsValidChar && !(objEvent.ctrlKey && strChar == "v");
    }
    else{
        return blnIsValidChar || objEvent.ctrlKey;
    }
}