Where/how does a current source fit in the IVI class structure

I have not seen any IVI drivers for download for current sources. This is one of the more challenging instruments for me to write general VIs.

According to

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hi,
i have a field (County) on a form in a jsp page that needs to get all its values from the database and present it to the user also i have another field (year) this also needs to get all its values as a drop down from the database.
i dont have any lib tag available to use and can't afford the time to set this up. so just have to script in jsp or use beans in jsp.
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Q1. - i was thinking of having a DataAccess (dA) object to run a sql to select * distict couties ...
also have another query in DataAccess select * Distinct year....
and in the jsp instantiate the (dA) and iterate through and fill the select drop down box - how to code this syntax i'm not sure and if this is the correct approach or the only approach would appreciate some sample code that i can mess around with thanks.
- is above approach best way of doing this. - also taking into account Q2.
Q2 - when the user selects county then i need to fire a onChange event - probably using javascript but not sure how this works - bascially i need to then update the year drop down according to the below sql-
again how is this possible - and is this the best approach or will it be too many calls to the database - especially consdering that the forms are all part of a search tool.
SELECT     DISTINCT     v.year
FROM          v_volumes     v
WHERE          v.county     = <the selected county>
OR          (v.county_reference     =
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ORDER BY v.year

Sorry to rain on your parade, but its not going to be quite that simple.
Populating a second dropdown depending on the first one, has been discussed quite in depth on this forum, I suggest you do a search to look at older posts.
Javascript code cannot call java/database code from an onclick event.
The best it can do is trigger a form submission, which reloads the page
running any java/sql code that displaying the page entails.
So onlick event on the first dropdown triggers a form submit, which loads the page with the correct values in the second dropdown.
con: requires a page request
The other approach is to download ALL possible values to the jsp page, and have javascript handle the swapping of values.
pro: no page refresh needed
con: must have all data available on the page. javascript is a bit more complicated.
Hope this helps,
evnafets

Where/how does a current source fit in the IVI class structure

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