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I'm making some significant changes to some VBA code, and some variables are being deleted and/or renamed. It would be a lot easier to find all the locations I need to update if the compiler would complain to me that the variables don't exist instead of creating it on the fly.
How do I force VBA/Access to require variables to be declared?
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Activate Option Explicit in VBA First, open the Visual Basic Editor and in the tools menu click on the options. After that, in the options in, go to the editor tab and tick mark “Require Variable Declaration”. In the end, click OK. Once you do that, VBA will add option explicit whenever you add a new module.
“Option Explicit” is our mentor in declaring the variable. By adding this word, it makes the variable declaration a mandatory process.
Use the Option Explicit statement on first line of a module to force all variables to be declared before usage (see ALWAYS Use "Option Explicit" ). Always using Option Explicit is highly recommended because it helps prevent typo/spelling errors and ensures variables/objects will stay their intended type.
In VBA, we need to declare the variables before using them by assigning names and data type. In VBA, Variables are either declared Implicitly or Explicitly.
You need to use Option Explicit at the top of each VBA code module including forms and reports.
You can set this for all future created modules and VBA code behind forms and reports by going into the VBA editor >> Tools >> Options >> Editor tab and ensuring Require Variable Declaration is checked.
From Access 2003 help:
Require Variable Declaration — Determines whether explicit variable declarations are required in modules. Selecting this adds the
Option Explicitstatement to general declarations in any new module.
I also use camel case when I Dim my variables. ThisIsAnExampleOfCamelCase. As soon as I exit the VBA code line if Access doesn't change the lower case variable to camel case then I know I've got a typo.
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