Map of Unicorns customer locations
Our requirement was to find a way of creating a map that displayed customer locations and key details, such as names and addresses. In addition, we wanted the ability to filter the map results to show only certain categories...
VDF Ajax JSON Interface Example
Our Ajax JSON VDF web interface
VDF Ajax Web service
The Visual DataFlex Ajax library is made up of a number of distinct elements:
Server-side ASP include files
A VDF web service
It is the last of these - the web service - that we are interested in here.
The VDF Ajax web service encapsulates a great deal of...
The JSON Parser
In mid-January 2009, at a Data Access partner meeting in Barcelona, a group of us were given early sight of the not-quite-finalised list of features being considered for inclusion in the forthcoming release of Visual DataFlex: the 2009 15.0 version.
Almost the first question that Sture Andersen and...
Some Degree of Introspection
Danger, Will Robinson!
This is not a subject for the uninitiated.
Unless you have delved into that ancient grimoire of forbidden lore "Understanding FMAC", penned in the deeps of time by the legendary black magician Jeffery B. Jarvis, you might want to look away now!
This is where it all...
VDF Ajax JSON service
The JSON web service is built into the same WebApp as the VDF Ajax web service in WebApp.src:
Object oWebApp is a cWebApp
Use WebService.wo // Original web service
With the combination of the VDF Ajax web service, Sture Andersens SomeDegreeOfIntrospection package, John Tuohys JSON parser and our JSON service, the server side of our example is complete. That however is only half the story, since without a client to invoke it from,...
Example: VDF Ajax JSONP Interface
Following on from our VDF Ajax JSON Interface sample, we thought we would do the same thing using JSONP rather than JSON over the conventional XMLHttpRequest from the web browser.
Doing this with VDF presents a number of technical challenges even on top of those we encountered with the JSON interface....
WebQuery for Visual DataFlex - Open Source Reporting
WebQuery is a view you can include in your own Visual DataFlex 17.1 (or higher) WebApp programs to provide users with an ad hoc reporting capability.
WebQuery - Some history
WebQuery is a reimplemetation of Sture Andersens VDFQuery Windows utility as a VDF 17.1 WebApp Framework...
Try our Sample Applications