Onkeypress, javascript is not validating special character -

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javascript function avoid special characters. working expected alpha & numbers.only problem is, when need include -,. (k >= 188 && k <= 190) - not working. doing wrong?

    var k;     document.all ? k = e.keycode : k = e.which;     return ((k > 64 && k < 91) || (k > 96 && k < 123) || (k >= 188 && k <= 190)|| k == 8 || k == 32 || (k >= 48 && k <= 57));

this latest code,it support browser. function isalphanumeric(evtget) {

    var browser = navigator.appname;     if (browser == "microsoft internet explorer" || browser == "mozilla firefox") {         var keyget = evtget.keycode;     } else {         var keyget = evtget.which; //(window.event) ? evtget.which : evtget.keycode;     }     alert(keyget);         if ((keyget > 47 && keyget < 58) || (keyget > 64 && keyget < 91) || (keyget > 96 && keyget < 123) || (keyget == 9) || (keyget == 32) || (keyget == 8) || (keyget == 0) || (keyget == 13)||(keyget==110))             return;         else             if (browser == "microsoft internet explorer" || browser == "mozilla firefox")             window.event.returnvalue = null;         else             evtget.preventdefault(); }

put above code in header of jsp

and call input field onkeypress="return isalphanumeric(event,this.value);">

suppose want change in code per requirement,there alert box please run code 1st click on key board show keycode per requirement

example-you want enter (.)in field show keycode dot id 47 , can write (keyget==47)


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