onKeyDown code not working on android mobile browsers

Below code is not working properly on mobile browsers, the reason is event.keyCode or event.which is not returning proper value on mobile browser

 onKeyDown: function (event) {
	        var owner = this, pps = owner.properties,
	            charCode = event.which || event.keyCode;

	        // hit backspace when last character is delimiter
	        if (charCode === 8 && Cleave.Util.isDelimiter(owner.element.value.slice(-1), pps.delimiter, pps.delimiters)) {
	            pps.backspace = true;

	            return;
	        }

	        pps.backspace = false;
	    },

[andrglo]

It worked using this hack:

    var owner = this,
      pps = owner.properties,
      charCode = event.which || event.keyCode;

    // hit backspace when last character is delimiter

    if (Util.isAndroid() &&
        event.target.value.length &&
        event.target.value.length === this._lastEventValue.length - 1 &&
        Util.isDelimiter(pps.result.slice(-1), pps.delimiter, pps.delimiters)
    ) {
      charCode = 8;
    }
    if (charCode === 8 &&
        Util.isDelimiter(pps.result.slice(-1), pps.delimiter, pps.delimiters)) {
      pps.backspace = true;
    } else {
      pps.backspace = false;
    }
    this._lastEventValue = event.target.value;

[mony224461]

Can anyone help how to write this code…

function isNumberKey(evt){ var charCode = (evt.which) ? evt.which : event.keyCode if ((charCode < 48 || charCode > 57)) return false; return true; };