<script><![CDATA[  
    zk.afterLoad("zul.inp", function () {
        var _xInputWidget = {};
        zk.override(zul.inp.InputWidget.prototype, _xInputWidget, {
            _shallIgnore: function (evt, keys) {
                if (evt.keyCode || evt.charCode) {
                // ZK-1736 add metakey on mac
                    if (zk.mac && evt.metaKey)
                        return;
                    else {
                        var code = (zk.ie < 11 || zk.opera) ? evt.keyCode : evt.charCode;
                        if (!evt.altKey && !evt.ctrlKey && _keyIgnorable(code)
                        && keys.indexOf(String.fromCharCode(code)) < 0) {
                            evt.stop();
                            return true;
                        }
                    }
                } else {
                    var orgEvtText = evt.domEvent.originalEvent.clipboardData.getData('text'),
                        text = (orgEvtText) ? orgEvtText : window.clipboardData.getData('text'),
                    text = text.trim();
                    keys = keys.replace(/[-[\]{}()*+?.,\\^$|#\s]/g, '\\$&');
                    var regKey = '^[' + keys + ']+$';
                    if (!new RegExp(regKey).test(text)) {
                        evt.stop();
                        return true;
                    }
                }
            },
            _updateValue: function (pasteEvent) {
                //Support maxlength for Textarea
                if (this.isMultiline()) {
                    var maxlen = this._maxlength;
                    if (maxlen > 0) {
                        var inp = this.getInputNode(),
                            clipboardEvent = pasteEvent ? pasteEvent.domEvent.originalEvent : null,
                            val = clipboardEvent ? clipboardEvent.clipboardData.getData('text') : inp.value;
                            val = val.trim();
                        if (val != this._defRawVal && val.length > maxlen) {
                            inp.value = val.substring(0, maxlen);
                            if (pasteEvent)
                                pasteEvent.stop();
                        }
                    }
                }
                this._startOnChanging();
            }
         });
    });
    ]]></script>