How to use JavaScript alert() function?

The syntax of JavaScript alert () is as follows where the message or warning intended to display to the user is included within the brackets. We will use the alert () function in the following example. Here, a button is created; the purpose of this button is that when a user clicks on it, the page will display the alert box.

What is the use of alert() method?

The alert () method is used when you want information to come through to the user. The alert box takes the focus away from the current window, and forces the user to read the message. Do not overuse this method. It prevents the user from accessing other parts of the page until the alert box is closed. Optional. The text to display in the alert box.

How to show an alert box on a browser window?

The alert () method is used to show an alert box on the browser window with some message or warning. We can use it as a message or as a warning for the user. Approach: To show an alert on the browser window, we make a button. When we click on the button, a click event listener is called that calls a function.

What is alert message on click?

Alert message on click A very common use case for the alert fuction is to use it when filling a form and then trying to submit it by clicking a button. Let's say we want to make sure the user is over 18 years old when filling the following form: