I quickly had issues with data consistency because the RecID field is not a permanent identifier for data. A RecID can be reused when a record is deleted and new data is inserted into the DB.įor example, after you populate the listbox with the records you want (using the RecID as the rowtag), this data now becomes stale.
If another user deletes, let's say record 5 (RecID 5), and you click on the listbox with the rowtag of (RecID) 5 - any DB operations you perform with that RecID will be on the wrong data. Use the CellStyle and ColumnStyle methods to add style information to selected cells and/or columns. Docs for the Xojo programming language and IDE. The WebListBox provides many of the features of the desktop Listbox. This is also the base class for the WebListBoxDateTimeRenderer.
Now you can get a closer, truer look at your control when your project is run in a web browser.
#XOJO WEBLISTBOX HOW TO#
For information on how to implement your own custom subclass of this class with Javascript, see the WebSDK. Xojo 2022r4 includes a much improved WebListBox preview in the Layout Editor. I found it safer to place a ULLONG field in tables were I needed permanency and use either a Serial32 or Serial64 (which is basically a sequence) to generate a unique identifier for each record. Used to create custom WebListBox cells via the WebSDK. I also set this field's "Unique" attribute to true. Xojo is a multi-platform, object-oriented application development tool that enables people to created high-quality, powerful and secure applications for the. I retrieve both RecID and sequence number from the DB when populating a listbox and place one field in the rowtag and one in a column with a width of 0 making it invisible. Which one goes where is up to you and your programming style. Xojo is a multi-platform, object-oriented application development tool that enables people to created high-quality, powerful and secure applications for the desktop (OS X, Windows and Linux), web and web-mobile. The Xojo rowtag can also take an array if you want to get creative and put both the RecID and the sequence # in the rowtag.īefore I complete any record operations, i check the DB to see if the sequence # still exists and if so, does the RecID match. Added HeaderPressed and HeaderStyle properties to WebListBox. We are currently planning to ship this updated Web framework in Xojo 2023r2.
#XOJO WEBLISTBOX UPGRADE#
Bootstrap continues to improve and as a result we are working to upgrade the Web framework to the latest version. If true, the record still exits and I use a server side cursor to lock the record while I perform whatever operation needs to happen. Bootstrap is the toolkit the Xojo Web framework uses to create the UI controls for your web projects. If the sequence number doesn't exist, the record was deleted before I refreshed my listbox. Contribute to xojo/EddiesElectronics development by creating an account on GitHub. There are many ways to do this as Ruslan or Ivan can tell you.
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