How can we show previous 12 month on selecting a particular month in filter

Hello rahuldhomane ,

You can try below widget script to display previous 12 months of data from selected month.  Here update the variable 'monthFilterName' with name of your filter. 

widget.on("beforequery", function(se,ev) 
{
	var monthFilterName = "Months in Date of Joining"; 
	var numberofPrevMonths = 10
	
	monthFilter = ev.query.metadata.find(el => el.jaql.title == monthFilterName && el.panel == 'scope')
	
	if(monthFilter)
	{
		
		prevMonth = new Date(monthFilter.jaql.filter.members[0])
		for(i = 1; i < numberofPrevMonths; i++)
		{
  			prevMonth = new Date(prevMonth.setMonth(prevMonth.getMonth()-1))
			preMonthStr =  prevMonth.getFullYear() + '-' + ('0' + (prevMonth.getMonth()+1)).slice(-2) +  "-01T00:00:00" //prevMonth.toISOString();
			
			monthFilter.jaql.filter.members.unshift(preMonthStr)
		}
	}
	
});

Also if you add Date Range Slider plugin, it will give you an option to select any date range in addition to previous 12 months.

Please let me know if you have any questions

Always here to help,
Harry from QBeeQ
harry.km@qbeeq.pl
QBeeQ - Gold Implementation and Development Partner
www.qbeeq.pl