Validating a tax id

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Though you will interact with a variety of individuals, we ensure you always have access to experienced managers who are in charge of your file.

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.

When you play around with the function, you’ll notice that the validation function is only called when the focus leaves the field, so you have to click outside of the field to actually make that error message pop up.

In that case, the previous value of the field is restored, and the user has to enter the data again.

If the parameter is a valid postcode, the function returns it correctly formatted - i.e.

in uppercase and with a space between the inward part and the output parts.

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To start, we create a text field and bring up the properties dialog for the field.

To learn more about the event object, take a look at JS.88.560– make sure to click on the button in the upper left corner to display the navigation pane if it’s not shown automatically.

The third bulletpoint is a little difficult for me to solve in an elegant way.

These functions check the validity of a UK postcode specified by the supplied parameter. The definition of a valid postcode has been taken from the official specification, and from the list of BFPO codes.

The functions also take into account which letters are valid in the various positions.

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