Everyone know how to modify view in SharePoint document list or any custom list. I.e. Enter the list -> click modify view -> and filter based on name etc.
However, I am trying to achieve this in a app part in SharePoint Online.
It would be nice, if anyone can give me an idea how I can apply filter [modify view] programatically using JavaScript in SharePoint online app part.
If I understand your question correctly you are trying to allow the user to change to a different view that is already created for a specific list. One approach may be to use the view's id and attach it to the URL as a parameter (i.e. ?viewid=[the view's id number]). You can see the id when displaying the list using the view while using the OTB SharePoint list display.
Another approach would be to use the REST API to read all of the views available for the list and present them to the user.
Once you have their selection navigate to the list's URL with the appropriate view parameter.
See SharePoint REST for information on the REST API.
