landview application and AJAX

[Dylan Beaudette]

Greetings,

I have been working with the Landview DHTML interface to mapserver, and would 
like to include support for some additional asynchronous interaction with a 
database. 

Currently our application works like this:

select a region --> generate URL based on selection --> mapserver application 
with arguments in URL --> interaction with mapserver application

I have written some functions in javascript and PHP to perform a spatial query 
on a PostGIS database:
mapserver application --> calculate extent center coordinates with JS --> AJAX 
style request to PHP function page --> data is returned to mapserver page and 
displayed

this is being done in the postdraw() function found in the landview 
application.


I am having trouble figuring out how to pass the results from the above 
function to the creation of the mapserver object such that this value is also 
passed to the mapfile.

In particular, I am curious about when the following line from the landview 
application is executed:

var ms = new Mapserv("main", the_mapfile,  ... );

Any ideas on how to do this?

Thanks!





-- 
Dylan Beaudette
Soils and Biogeochemistry Graduate Group
University of California at Davis
530.754.7341