if you want to find Monday then 'dayOfWeek' is 1 if it is Tuesday it will be 2 and so on.
var date=new Date();
getNextDayOfWeek(date, 2);
// this is for finding next tuesday
function getNextDayOfWeek(date, dayOfWeek) {
// Code to check that date and dayOfWeek are valid left as an exercise ;)
var resultDate = new Date(date.getTime());
resultDate.setDate(date.getDate() + (7 + dayOfWeek - date.getDay()) % 7);
return resultDate;
}
Hope this will be helpfull to you, thank you