Updating a Secondary Data Source in InfoPath Using AJAX
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Published: 01 Nov 2006
Abstract
Microsoft Office InfoPath does not offer out-of-the-box persistence of data in secondary data sources; only data within the Main data source is persisted. To make updating secondary data sources possible, changes have to be saved back to the underlying source of secondary data sources. This article shows how you can use AJAX to update the data of a secondary data source.
by S.Y.M. Wong-A-Ton
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Introduction

Secondary data sources in Microsoft Office InfoPath are XML files, databases, SharePoint lists, or web services that have been linked to an InfoPath form, but for which no data is persisted in the form itself.  Therefore, any changes made to the data of a secondary data source are lost upon closing the form, unless these changes have been saved back to the underlying data store of the secondary data source.

This article discusses the use of Asynchronous JavaScript and XML, better known as AJAX, to permanently update data in a secondary data source for which the underlying source is a database table in Microsoft SQL Server.


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