execute javascript not working

I have set the button action to execute javascript and added the code in the box. onclick=”_scheduler.show({ schedulerId: ‘sched_vvgfrx12ik’ })”;

I also tried adding javascript:onclick=”_scheduler.show({ schedulerId: ‘sched_vvgfrx12ik’ })”;

Is there another way it should be added to get it to function properly? When I check the code in inspector it shows this:

<a class="wpfront-button" onclick="javascript:wpfront_notification_bar_button_action_script();">Book Now</a>