How to dynamically populate data from a data source

Question

What I am trying to do:
I am building a simple blog reader application with two screens, 'Home' and 'FeedR'.
The data needed for this to work is an excel table 'Blogs'; which has the following columns:
BlogName, image, Source
I have created about 6 REST data sources from the RSS feeds of these blogs and added their names into the excel table.
The home has an "Image Gallery with Text", which has the blog image and BlogName on it. On the select event, I want to navigate to the second screen and populate the text gallery with the feed details.
The Problem:
So, when I have only feed, I can do something like:
'Navigate(FeedR, ScreenTransition!UnCover);Collect([@blogposts], rss_aspx!channel!item)'.
When I have more than one feed; I would like to be able to do something like:
'Navigate(FeedR, ScreenTransition!UnCover);Collect([@blogposts],
(Blogs!Source)!channel!item)'.
The Question:
Is dynamically populating the name of the data source work? If yes, how do I do it? If no, is there a way around it?
I was looking at UpdateContext(), but does not seem like a feasible option.
Thanking you...
Hemanth

Answer 1

you wanted a onchange for a htmlb:inputfield which would also trigger server event. try the following code.
<htmlb:inputField id            = "test"
                            alignment     = "LEFT"
                            size          = "6"
                            required      = "TRUE"
                            doValidate    = "TRUE"
                            type          = "INTEGER"
                             />
<bsp:htmlbEvent id="myid" onClick="myonclick" name="ValueChanged" />
  <script for="test" event=onchange type="text/javascript">
alert(this.value);
ValueChanged();
</SCRIPT>
if the value in the inputfield is changed it would trigger a alert at the client side and also trigger a server event. now you can caputre the value in oninputprocessing.
Hope this helps.
do let us know if you need help in how to capture this value in oninputprocessing.
Regards
Raja