So we have a very simple web form along with only one input data field as “Name”. Please note that we have used the required keyword in the input tag element.<\/p>\n

Output<\/strong>:<\/p>\n

<\/p>\n

Let’s try to submit the form without entering any value in the name field. Upon submitting, you will get the error message as “Please fill out this field”, and the form will not be submitted.<\/p>\n

Output with blank data:<\/strong><\/p>\n

<\/p>\n

So it can be seen that the error message is not added by us and is provided by HTML itself.<\/p>\n

Like the required attribute provided by HTML, there are various form tags available to use. Below is the list of some form validation tags,<\/p>\n

\n
• \nminlength: <\/strong>Used to set the required minimum length of an element<\/li>\n
• \nmaxlength:<\/strong> Used to set the required maximum length of an element<\/li>\n
• \npattern:<\/strong>?Used to define a regex expression<\/li>\n<\/ul>\n

  2. Using JavaScript<\/h4>\n

  JavaScript is used widely for HTML form validation as it provides more ways to customize and set the validation rules; also, some of the tags provided in HTML5 are not supported in the older versions of Internet Explorer. JavaScript is being used for a long time for form validation.<\/p>\n

  In JavaScript form validation, basically, we define functions to validate the data before submitting it to the server. We can implement any logic required for achieving the validation rules. JavaScript is more flexible in this way because there is no restriction on defining rules. But it is necessary to know?JavaScript to implement this compared to form validation using built-in tags.<\/p>\n

  Let’s see the example of form validation using JavaScript. We will implement the same example of the form with only one input as the name element.<\/p>\n

  Example<\/strong><\/p>\n

  \n\n\n