I had a Combobox (lookup) in an infopath form. I tried to get the value from the lookup by the auto suggestion method. But it does not work. Does anyone know how to implement the filter-while-user-typing, using only an infopath form. Thanks in advance
This cannot be done without code. If you can only use native InfoPath, there is no type-ahead functionality for combo-box or drop-downs.
If this is a list form, you will not be able to use code behind at all. You may get some traction with a JavaScript approach. Start with this blog post that explains the process using Marc Anderson's SPServices on the web page where the form displays: