Validating user interface in

23-Aug-2016 15:13

Adobe provided a lot of infrastructure to do that with just a simple script.

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).

The simplest kind of data entry consists merely of pointing at something -- selecting an item or designating a position on a computer-generated display.

In more complicated modes of data entry, a user may have to control the format of data inputs as well as their contents.

Thus questions of format control in text entry/editing and graphic interaction may properly be considered questions of data entry.

Note, however, that user inputs which initiate or interrupt transactions -- such as command entries, or control entries selected from a displayed menu or by function keys -- pose rather different questions of design.

Data validation rules constitute the constraints that data input and processing must adhere to in addition to the structural constraints imposed by a data model.

Web modeling tools do not make all types of data validation explicit in their models, hampering full code generation and model expressivity.

By contrast, they will usually perform just one summative usability test to validate a user interface design prior to “freezing” it and applying for regulatory approval.

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.

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

Web application frameworks do not offer a consistent interface for data validation.

In this paper, we present a solution for the integration of declarative data validation rules with user interface models in the domain of web applications, unifying syntax, mechanisms for error handling, and semantics of validation checks, and covering value well-formedness, data invariants, input assertions, and action assertions.

By contrast, they will usually perform just one summative usability test to validate a user interface design prior to “freezing” it and applying for regulatory approval.

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.

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

Web application frameworks do not offer a consistent interface for data validation.

In this paper, we present a solution for the integration of declarative data validation rules with user interface models in the domain of web applications, unifying syntax, mechanisms for error handling, and semantics of validation checks, and covering value well-formedness, data invariants, input assertions, and action assertions.

The member ‘rc’ (or return code) is used to communicate back if the validation was successful or not.