Code for validating login textbox in Non sexual chat
Most current web browsers support these features and handle input validation.
Also, HTML5 validation helps users inputting data by providing specific controls, such as date pickers and custom on-screen keyboards.
attribute allows the use of regular expressions to specify custom formats for the input.
We have to be very careful here not to get carried away, creating overly aggressive validation that breaks the natural browsing behavior and gets in people’s way.
For example, I’ve seen forms where it’s impossible to ) to force the focus to stay inside the field until it’s valid.
This is particularly important for actions that are permanent or otherwise critical, but also when data cannot be automatically checked.
For example, providing users with the option to check the postal address that they provided can be useful before a purchase is completed.
These dialogs are expected to respect the settings and preferences of the user in the web browser (and operating system), such as default font-size, colors, and language.