Tip

Detecting a changed field value between document saves

Sometimes it is useful to know if a key field(s) has changed value during a document edit before you save the document. You may need to perform some additional processing if a field has changed or you need to properagate the changed value to other documents.

Assuming 'DocumentTitle' is the field on the form that we are interested in (we can apply this to more than one field if needed).

Create a hidden, Computed for Display text field at the top of the form, called 'OldDocumentTitle' Formula; @If( @IsNewDoc; DocumentTitle; @IsDocBeingLoaded; DocumentTitle; @IsDocBeingSaved; DocumentTitle; OldDocumentTitle )

Create a second hidden, Computed for Display number field at the top of the form, called 'HasTitleChanged' Formula; OldDocumentTitle != DocumentTitle

(you could also make it case-insensitive by wrapping both sides of the above test in @Lowercase)

this field will be return; true - if the value for 'DocumentTitle' has changed since last save false(0) - if document is un-saved (new) or 'DocumentTitle' has the same value as when last saved

We can then use this in the QuerySave form event;

LotusScript; Call Source.Refresh() ' will kick off validation and refresh computed fields If ( Source.FieldGetText( "HasTitleChanged" ) ) Then 'call a change routine

This was first published in June 2001

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