Reusable revision history log

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This is a quick and easy-to-use code snippet that is very handy when you need to build a Revision History control in your application.

Please follow these four steps:

1. Create a new sub-form.

2. Create a computed field with a suitable title say, 'Revision_History'. Make sure it has the property 'Allow multiple values' checked.

3.The default value of the field must be this:

4.In the Query_Save event of the sub-form, paste the following code:

That's it. Save the sub-form and insert it in the form of your choice. Works great.

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For a really useable version history log, give users the ability to see what changed. By extending this code, you can have something really useful.There are two relatively easy ways to do this, depending on the level of detail desired.

1. List the fields that changed. Get a ha

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ndle to the back-end docs, walk the fields, and build a list of the ones that have changed.
2. Provide a means of determining which fields should be monitored, and compare those fields. A profile doc works well, and you can use script to build a list of forms in the db, and on form selection, get a list of the fields in the form for the user to choose from.

A further extension of this would be to allow the users to configure certain fields to keep a real revision history on, and capture the old values to a history.

—B. Hawthorne

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