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Tip of the Day
Language: SQL
Expertise: Beginner
May 29, 1997



Building the Right Environment to Support AI, Machine Learning and Deep Learning

Pop-up list problems

Why can't I put a simple piece of code in the click event for a list box and have it execute? Also, how can I choose a value from a list without OPO asking me to commit changes?

If you want a piece of code to execute when someone selects a value from a list box, you should add it to the Validate method for the list box, because this is fired whenever the Value for the list box changes through user interaction.

Regarding OPO prompting you to commit changes, this will only happen when you change a value in an object that is bound to a data column. If you want to allow users to change a value in a list box, you should have the list box be unbound and have a change in the Value of the list box ripple down to a hidden bound data field. Think about this before you do it, though, because you are subverting some of the powerful default features of OPO with this plan.

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