New answers tagged field-controls
i finally managed to do it with http://jqueryui.com/autocomplete/#combobox you can nicely converts the default Dropdownlist to combobox 0- Load the needed Scripts and resources (i prefer editing the page with sharepoint designer and place script inside PlaceHolderAdditionalPageHead PlaceHolder rather than CEWP) <link ...
If your form is a regular InfoPath template (not a SharePoint list form) you will only be limited in the amount of fields you can promote to a library (if the form is published to a SharePoint library) - to my knowledge, there is no constraint on the number of fields you can have in a form. That said, a data source with 1,000 fields usually has potential ...
As far as I know the limit is based on the SharePoint Column limits that is 276 for Single line of text You can check the details for the limits here SharePoint Limits
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