DataFlex Learning Center

01

Not cleaning up objects created in functions

(1m 16s)

The first mistake is not necessarily exclusive to WebApp development, but something we often see. It's not cleaning up objects that you created within functions. The reason we're highlighting it here is that we often see this happen when working with the JSON parser within a Web Application.

02

Not testing outside the debugger

(1m 34s)

The next mistake is one every DataFlex developer has encountered at least once when building a WebApp. It's not testing your application outside of the debugger. The problem here has to do with a nifty little thing we call "Process Pooling".

03

Using Get and Set instead of WebGet and WebSet

(2m 09s)

This is one we often see when developers transition from building Windows Applications to their first Web Application. In Windows, accessing properties is done using Get and storing properties is done using Set. Because the application is running locally and is a single process, this works as you'd expect it to. In a Web environment however, this works a little different.

04

Not validating user actions on the Server

(1m 07s)

In the WebApp Framework, you build your user interface by placing a number of Web Objects like forms, buttons, etcetera. The thing is that, hiding or disabling the object does not mean it's not actually there or inaccessible. With some simple DOM manipulation or console magic, a malicious user can display information he's not meant to see or perform actions he's not allowed to perform.

05

Interference of the browser cache

(1m 44s)

The last one is about the annoyances of the browser cache. While this is helpful in improving overall browsing experience, it is usually unwanted during development.

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5 Common WebApp Mistakes