Allow only Upper Case Characters and Space

function UpperCaseCharacter(object,e)//onkeyup

{

var Val=object.value;

var ValLen=object.value.length;

var allowChar=UpperChar+" ";

for (i=0; i<ValLen; i++)

{

if(allowChar.indexOf(Val.charAt(i)) == -1)

{

object.value=Val.substring(0,i);

break;

}

}

/*var KeyCode =getKeyCode(e);

var keyChar = String.fromCharCode(KeyCode);

if ((keyChar >= "A" && keyChar <= "Z" ) (KeyCode ==8)(KeyCode ==32))

{

return true;

}

else

{

return false;

}

*/

}

<input name="txtUpperCharacters" type="text" id="txtUpperCharacters" onkeyup="javascript:UpperCaseCharacter(this,event);" />