Validating information on the web dating 3rd date
There are validators for other web technologies, such as HTML, CSS, and accessibility guidelines, and these have all proven quite popular.
As personal news syndication is becoming more widespread, we saw a need for a comprehensive but easy-to-use validator for syndicated feeds.
You might also have certain restrictions on the values.
Let’s take a look at how to do that with a text field that is only supposed to have a value of either ‘AAAA’ or ‘BBBB’ (yes, I know that this does not make much sense in a real PDF form).
So, if the user enters ‘01234’ we should see an error message that would instruct the user about what type of data is valid for this field.
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.
When you restrict the values that users can enter in forms, you reduce the chance that someone can enter a value that can compromise the security of your site.