How will you validate user input in programming
Answers
Answer:
Forms frequently include required input that needs to be clearly identified using labels. Also, the required attribute can be added to form controls, to programmatically indicate that they are required. Most current web browsers support this attribute and will communicate missing required input to the user, using standard web browser dialog mechanisms. 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 required attribute is added to the input field. 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.
Note that the label also displays “(required)”, to inform users that don’t use assistive technology or use older web browsers that do not support the HTML5 required attribute.