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To start, we create a text field and bring up the properties dialog for the field.
Then we select the “Validate” tab to see the validation options: The default is that the field will not get validated.
One of the questions I get asked again and again is how to validate a field value in an Acro Form with a custom validation script.
Adobe provided a lot of infrastructure to do that with just a simple script.
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For numeric fields, there is a convenient way to validate a value range, but we want to select to run a custom validation script.
After the “Edit” button is clicked, a new window will open that allows us to edit the new script: This script also includes a check for an empty string, so that the user can wipe out a wrong string and start from scratch.
The code also limits the user to including a single decimal point, and restricts the minus sign to the first character.If you are using a VBA Userform, you are almost surely using the Text Box control, and in many of these circumstances you may wish to restrict what sort of data the user is allowed to enter, such as numeric only.