Uncaught TypeError when using jQuery.sap.syncStyleClass

Hi, i met uncaught typeerror . Here is the js code
handleConfirm : function(evt) {
if (!this._oDialog) {
this._oDialog = sap.ui.xmlfragment(
"sap.ui.demo.myFiori.view.Dialog", this);
this.getView().addDependent(this._oDialog);
// this._oDialog.bindElement("/ProductCollection/0");
// toggle compact style
jQuery.sap.syncStyleClass("sapUiSizeCompact", this.getView(),
this._oDialog);
this._oDialog.open();
when i call the method, the error is showed as below.
Thanks for your attention.

Hi Dennis, thanks for ur demo. I updated the code as follow
handleConfirm : function(evt)
if (!this._oDialog) {
this._oDialog = sap.ui.xmlfragment(
"sap.ui.demo.myFiori.view.Dialog", this);
this.getView().addDependent(this._oDialog);
if (this.getView().$().closest(".sapUiSizeCompact").length > 0) {
this._oDialog.addStyleClass('sapUiSizeCompact');
this.getView().addStyleClass('sapUiSizeCompact');
jQuery.sap.syncStyleClass("sapUiSizeCompact", this.getView(), this._oDialog);
this._oDialog.open();

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