Validating text box entries Granny in chat

If your web browser supports HTML5, it will not allow you to submit the form without entering text into the input field.Instead, it will display a message that is generated by the web browser itself.This means that validation needs to be carried out server-side as well.Where possible, users should be able to check their input and correct it if necessary.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.The required pattern consists of one to three letters (for the city where the car is registered), followed by a space, two to four random letters, another space, then one to four random numbers.

Forms frequently include required input that needs to be clearly identified using labels.Input errors, such as an incorrect email address, will be indicated using the web browser dialogs as in the previous example.attribute allows the use of regular expressions to specify custom formats for the input.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.In the example below, the attribute is added to the input field.

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