Pending Review
Last Updated: 08 Jun 2018 08:51 by ADMIN
Kelso
Created on: 11 Aug 2014 14:06
Category: Data Source
Type: Feature Request
12
add a more complete implementation of signalr.
Signalr is a push technology, but your current implementation is not robust enough to allow data from an outside source to be pushed to your grid. A stop measure for this would be to include the ability to use a function in addition to a string for the server read function. This would enable a developer to chain a server call to refresh data when data changes are coming from a source outside your grids. A full implementation of signalr would be to code your grid to accept a signalr call from the server hub that directly updates client data from any source, as long as it conforms to the model for the grid. This could be possibly done through the use of a signalr grid group, that the server could push to. This group should be a group of one that maps to a specific grid. This would also allow multiple grids on a page/form to be independently updated. Currently your signalr grids interfere with each other if the calls are running at the same time on that same page/form, both synchronously and asynchronously. 
3 comments
Imported User
Posted on: 26 Nov 2014 11:37
Rudi Larno: 
I got round your scenario by using a kendo.observable for the grid source then using signalR on its own to pass data to the observable.
That way I had very fine grained control of exactly what was updated.

Kendo should really offer a "dataReceived" or something to allow to choose what to update and when on all datasources.
The parse function is helpful but doesn't feel like it would solve this problem.
Imported User
Posted on: 26 Nov 2014 11:33
I spent quite a bit of time playing with this, the demos online for this are out of date and apply to signalR 1.x ... since 3.x is on the horizon it's likely Microsoft will yet again change everything but from what I could get working I found that often telerik was not aware that this was the case and the default response is "see demo here <link>".

If Telerik is going to link to demos then they should at least be sure that when I nuget my packages it will accept a simple copy & paste from the demo and "just work".

Beyond that, to ask any more seems to be too much to ask given the early nature of signalR.
Rudi
Posted on: 03 Nov 2014 12:07
Even the default demo has a severe issue:
http://demos.telerik.com/aspnet-mvc/grid/signalr

If one person is editing a line in the grid, and an event (Create/Update/Delete) arrives, that user loses his focus, and any editing in progress.

We also uncovered that in fact the state of all (visible?) rows is being reset. 
We have a checkbox in front of every row, and an update from another user, causes the state of these checkboxes to be reset. Makes the grid unusable for the scenario we want.