Update component attributes on client

[stim644]

Hello. How insert component attribute on client with java script, without send request to server?
Button code:

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<p:commandButton onclick="showAddBookForm();" value="add book"  update="pan1"/>

Panel code:

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<p:panel id="pan1" widgetVar="pn1" visible="#{findBookBean.showFindBookForm}">
         <ui:include src="/pages/searchBook.xhtml"/>
</p:panel>

Java Script code:

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            function showAddBookForm() { 
                pn1.visible = false;
                
            }

Thanks!