Q:

SelectIndexChanged not passing parameter to webpart connection

In newform.aspx, I have webpart connection.  I pass employee-name to the webpart and this webpart renders employee detals.  Employee-name field is textbox. 
Everything was working fine until I changed the employee-name to be lookup field and when page rendered it became a dropdown.  Due to this the connected-webpart always shows the first record in the dropdown during on-load of the page and doesn't refresh when dropdown index is changed.   
The entire newform.aspx is customized using sharepoint designer.   
I am guessing, I need to write javascript(jquery/json) code and put in newform.aspx using sharepoint designer? 
Please suggest. 

A:

Web Part connections are established when the page loads.  A change in your employee selection doesn't reload the page so it won't update the connection. 
JavaScript/jQuery would certainly be a good choice for this client side behavior.  I'd suggest that you check out SPServices on Codeplex, and in particular for your case SPServices. SPDisplayRelatedInfo

