HTML5 new client-side checksum

1. Perform a checksum using the Check property

• Required: This property specifies that the form control must be filled in.
• Pattern: This property specifies that the value of this form control must conform to the specified regular expression.
• Min, Max, step: These 3 attribute values are valid for numeric types, <input.../> elements of date types.

2. Call the Checkvalidity method to verify

If the form object calls the Checkvalidate () method, returning True indicates that all form controls in the form are valid.

3. Custom error Prompts

HTML5 the new Setcustomvalidity () method allows you to implement custom error prompts.

4. Close the check

• Add Novalidate property for <form.../>.
• Set the Formnovalidate property for the <input.../> or <button.../> element of type= "submit".

HTML5 new client-side checksum