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Don Burleson Blog 







Oracle Application Express Apex APEX: Formatting & validating numeric & currency screen items

Oracle Tips by Burleson Consulting

There are a wide variety of choices for formatting currency items in APEX.  Some of the choices you must make for formatting APEX screen items for currency values include:

- Dollar Sign - You can display the item with the dollar-sign, but your end-user may strip it off when entering data, and you would need to write transformation rules to ensure consistency.

- Enforcing numeric format - You must validate that your currency item is in your desired form, with the dollar sign and decimal point in the right places.

You can get as fancy as you want, but here is a quick-and-dirty way to enforce a currency values using standard APEX item validations with regular expressions.  In my example, I needed a currency screen value with a maximum value of 99 dollars and 99 cents.  (Note: APEX does not have a numeric datatype for screen items, and all screen items start as text fields.)

I chose to omit the display of the dollar sign to make it easier on my end-user, and I defined the column with a maximum width of 5 characters, and used the APEX currency format mask:

Upon screen item display, a visual header reminds the end-user that the value is expressed in dollars:

Now I must enforce the 99.99 format on the screen.  Below I go into the APEX item validation wizard and specify a regular expression for the 99.99 format as "/d/d./d/d":

Upon testing, APEX catches the formatting error and displays a help error message to the end-user:

In sum, this is just one of many ways to enforce numeric and currency screen item values in APEX.  Mine may not be the most sophisticated or elegant, but it works and only takes a few minutes to code.

If you have a number with hundreds (e.g. 999.99) you can use a more sophisticated regular expression to match a three-digit number, a decimal point, and a two-digit format for cents, like this:


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