Drag one Text Box control and give it an ID of First Name Text Box, two Button controls (Submit Button and Cancel Button), and one Required Field Validator (First Name Required Field Validator). The following screen shows the form in action, and the user has pressed the Submit button without entering any text into the textbox. The Required Field Validator fails when the value in the associated control matches the value of the Initial Value property of the Required Field Validator.
A single Blackboard Learn instance can process many application HTTP requests daily (such as submit assignment, save assignment, log in to the system, log out of the system, and so on).
Predefined rules are accessed through webix.rules class.
Form validation Here you attach rules to inputs by their names.
It verifies that user requests coming in are safe by sanitizing the data through a default ruleset.
An advantage of the Input Validation Filter is speed.
For each request, Blackboard Learn is responsible for verifying that the code processing these requests contains the correct values.