Need help with a javascript virtual keyboard for TextBox

[lolly]

hi i recently used a virtual keyboard from www.codeproject.com/jscript/jvk.asp.
However this part of the code

function keyb_callback(ch)
   {
     var text = document.getElementById("textfield"), val = text.value;
 
     switch(ch)
     {
       case "BackSpace":
         if(val.length)
         {
           var span = null;
 
           if(document.selection)
             span = document.selection.createRange().duplicate();
 
           if(span && span.text.length > 0)
           {
             span.text = "";
             getCaretPositions(text);
           }
           else
             deleteAtCaret(text);
         }
 
         break;
 
       default:
         insertAtCaret(text, (ch == "Enter" ? (window.opera ? '\r\n' : '\n') : ch));
     }
   }
 
   // This function retrieves the position (in chars, relative to
   // the start of the text) of the edit cursor (caret), or, if
   // text is selected in the TEXTAREA, the start and end positions
   // of the selection.
   //
   function getCaretPositions(ctrl)
   {
     var CaretPosS = -1, CaretPosE = 0;
     ctrl.focus();
 
     // Mozilla way:
     if(ctrl.selectionStart || (ctrl.selectionStart == '0'))
     {
       CaretPosS = ctrl.selectionStart;
       CaretPosE = ctrl.selectionEnd;
 
       insertionS = CaretPosS == -1 ? CaretPosE : CaretPosS;
       insertionE = CaretPosE;
     }
     // IE way:
     else if(document.selection && ctrl.createTextRange)
     {
       // The current selection:
       var range;
       if(ctrl.tagName.toLowerCase() == "input")
       {
         range = ctrl.createTextRange();
       }
       else if(ctrl.tagName.toLowerCase() == "textarea")
       {
         range = document.selection.createRange();
       }
 
       // We'll use this as a 'dummy':
       var stored_range = range.duplicate();
 
       // Select all text:
       stored_range.moveToElementText(ctrl);
 
       // Now move 'dummy' end point to end point of original range:
       stored_range.setEndPoint('EndToEnd', range);
 
       // Now we can calculate start and end points:
       insertionS = stored_range.text.length - range.text.length;
       insertionE = insertionS + range.text.length;
     }
   }
 
   function setRange(ctrl, start, end)
   {
     if(ctrl.setSelectionRange) // Standard way (Mozilla, Opera, ...)
     {
       ctrl.setSelectionRange(start, end);
     }
     else // MS IE
     {
       ctrl.focus();
 
       var range;
 
       try
       {
         range = ctrl.createTextRange();
       }
       catch(e)
       {
         try
         {
           range = document.body.createTextRange();
           range.moveToElementText(ctrl);
         }
         catch(e)
         {
           range = null;
         }
       }
 
       if(!range) return;
 
       range.collapse(true);
       range.moveStart("character", start);
       range.moveEnd("character", end - start);
       range.select();
     }
 
     insertionS = start;
     insertionE = end;
   }
 
   function deleteSelection(ctrl)
   {
     if(insertionS == insertionE) return;
 
     var tmp = (document.selection && !window.opera) ? ctrl.value.replace(/\r/g,"") : ctrl.value;
     ctrl.value = tmp.substring(0, insertionS) + tmp.substring(insertionE, tmp.length);
 
     setRange(ctrl, insertionS, insertionS);
   }
 
   function deleteAtCaret(ctrl)
   {
     // if(insertionE < insertionS) insertionE = insertionS;
     if(insertionS != insertionE)
     {
       deleteSelection(ctrl);
       return;
     }
 
     if(insertionS == insertionE)
       insertionS = insertionS - 1;
 
     var tmp = (document.selection && !window.opera) ? ctrl.value.replace(/\r/g,"") : ctrl.value;
     ctrl.value = tmp.substring(0, insertionS) + tmp.substring(insertionE, tmp.length);
 
     setRange(ctrl, insertionS, insertionS);
   }
 
   // This function inserts text at the caret position:
   //
   function insertAtCaret(ctrl, val)
   {
     if(insertionS != insertionE) deleteSelection(ctrl);
 
     if(document.createEvent && !window.opera)
     {
       var e = document.createEvent("KeyboardEvent");
 
       if(e.initKeyEvent)
       {
         e.initKeyEvent("keypress",        // in DOMString typeArg,
                        false,             // in boolean canBubbleArg,
                        true,              // in boolean cancelableArg,
                        null,              // in nsIDOMAbstractView viewArg, specifies UIEvent.view. This value may be null;
                        false,             // in boolean ctrlKeyArg,
                        false,             // in boolean altKeyArg,
                        false,             // in boolean shiftKeyArg,
                        false,             // in boolean metaKeyArg,
                        null,              // key code;
                        val.charCodeAt(0));// char code.
 
         ctrl.dispatchEvent(e);
       }
     }
     else
     {
       var tmp = (document.selection && !window.opera) ? ctrl.value.replace(/\r/g,"") : ctrl.value;
       ctrl.value = tmp.substring(0, insertionS) + val + tmp.substring(insertionS, tmp.length);
     }
 
     setRange(ctrl, insertionS + val.length, insertionS + val.length);
   }

work well with textarea on IE but many errors arise when used on a textbox

Some errors include
The words are appended to the front of the orginals word
Insertion/delete in the middle does not work

I am on a tight schedule so i hope u guys can help me solve my problem asap.
Thanks

[Dmitry Khudorozhkov]

Hi,

the script you're talking about was updated:

http://www.codeproject.com/jscript/jvk.asp

Advanced callback function (that you quote) was updated too; it doesn't have any problems with either TEXTAREA and INPUT of type="text".

Best regards.