Thanks Arun Patidar , Its working beautifully.Thanks to you smacdonald2008​ also for your time.

I have custom script to restrict the page to initiate a workflow if the page is already in workflow.Code is working fine on browser console.But I need to integrate this in AEM on click of "Start Workflow" in touch UI page editor.Can some one tell me which clientlib category I need to pass to execute...