Java Script is one of the most popular languages in Full-Stack, Front-end, and Back-end Development.
It is used to create beautifully designed websites.
When an element is valid, the following things are true: Adds a custom error message to the element; if you set a custom error message, the element is considered to be invalid, and the specified error is displayed.
This lets you use Java Script code to establish a validation failure other than those offered by the standard constraint validation API.
One of the features of HTML5 is the ability to validate most user data without relying on scripts.
This is done by using validation attributes on form elements.
Validation attributes allow you to specify rules for a form input, such as whether a value must be filled in; the minimum and maximum length of the data; whether the data needs to be a number, an email address, or something else; and a pattern that the data must match.
This will pop the following alert when the Name field is left blank: Next, if you enter the name and leave the Password field blank, it will pop the following alert: Once you have added the name and password in the correct format, this page will be redirected to the page for the final output.
Now let’s move ahead with our Java Script Validation article and have a look at the example of Form Validation.
The following example is a code in HTML, CSS, and Java Script to validate a form where: It will redirect to another page and give the following output: Now, we need to add a Function in our Java Scipt to link the input id.
It is basically a set of statements that performs a task or calculates a value.
To use a function, it should be defined somewhere in the scope from which you wish to call it.