Using the Callback control framework

re: Using the Callback control framework

Dylan — Mon, 18 Dec 2006 22:08:35 GMT

This is very interesting. I'd like to send back JSON data from the server side event handler, or some JavaScript to execute a client side function once the result has been generated. Any modifications I should be aware of in that scenario? Can I use any of the common JavaScript AJAX wrappers like Prototype, YUI, jQuery to do some of the same stuff and still leverage the power of the server control? Thank you for starting this blog.

re: Using the Callback control framework

Ryan Olson — Mon, 18 Dec 2006 22:36:09 GMT

You can send back JSON, no problem. Send it as a parameter to a javascript function that you would like to execute. Use "javascript" as the event argument. We haven't tested this with Prototype, YUI or jQuery, so I can't comment on that.

re: Using the Callback control framework

Mohamed Moustafa — Tue, 26 Dec 2006 10:12:23 GMT

where i can find the Callback control framework ? is it embedded in .net 2005 or an external component.

re: Using the Callback control framework

Bryan Baker — Thu, 28 Dec 2006 18:13:43 GMT

The CallbackResult class is part of the Web ADF. It builds on the client callback framework that is part of ASP.NET 2.0. It makes transferring information between server and browser easier.

The WebControl abstract class, in the ESRI.ArcGIS.Web.UI.WebControls assembly, extends the ASP.NET WebControl class by adding the CallbackResults property. So any control that extends the Web ADF's WebControl can take advantage of the CallbackResults to send data.

re: Using the Callback control framework

pthoopth — Fri, 12 Jan 2007 13:28:59 GMT

How would I refresh just one tool on the toolbar? I can refresh the whole toolbar but I don't want to do that because then the toolbar reverts back to it's original state. For example, I originally have my Zoom In button selected when the page is first rendered. Then I click the Zoom Out button. When I click on the map to do the Zoom Out function it runs server code in which I want to enable a Zoom Previous button. In my server code I enable the Zoom Previous button and refresh the toolbar. I then add the callback results from the toolbar to the map callbackresults. It then renders the entire toolbar again which makes the Zoom Previous tool enabled but now my selected tool is back to Zoom In instead of Zoom Out because it rendered everything as it was originally.