how to hide drop down list in poymer-js

0
votes

I need to hide dropdown-menu. i tried .hidden property but it is not working

<paper-dropdown-menu id="firmChannelFilter" hidden="${(this._channelFilterVisibility)}" 
             class="small-padding" label="Channel Filter">
             <paper-listbox slot="dropdown-content" 
             .hidden="${(this._channelFilterVisibility)}" id="firmChannel"
javascriptnode.jspolymerdart-polymerpolymer-3.x