This is done by adding an onClick attribute and placing the JavaScript alert box code into it. In this case, when the user clicks on our button, a JavaScript alert box is displayed. Here's a basic example of adding JavaScript to an HTML element.

To better understand this tutorial you would need to have a little knowledge of HTML and CSS. Our calculator will only able to perform basic math operations: addition, subtraction, multiplication and division. The examples below demonstrate this for you. In this series, we are going to be making a simple calculator with basic HTML, CSS and JavaScript. Heres a basic example of adding JavaScript to an HTML element. For example, to run some JavaScript when the user clicks on an element, you add the onClick attribute to the element.

In your code, an event handler is simply a special attribute that you add to your HTML element. An example of an event could be when the user clicks on a particular HTML element. In JavaScript/HTML, an event handler allows you to attach your JavaScript to your HTML elements.Įvent handlers allow your web page to detect when a given 'event' has occurred, so that it can run some JavaScript code. Now this is fine - as long as you want it to run as soon as the page loads.īut, what if you don't want it to run as soon as the page loads? What if you only want it to run when a user clicks on a button?Įasy! This is where you need to use an event handler. HTML Tutorial CSS Tutorial JavaScript Tutorial W3.CSS Tutorial Bootstrap Tutorial SQL Tutorial PHP Tutorial jQuery Tutorial Angular Tutorial XML Tutorial.

With our online HTML editor, you can edit the HTML, and click on a button to view the result. If we place the above JavaScript between the head tags (or body tags), it will run as soon as we load the page. This HTML tutorial contains hundreds of HTML examples. Alert('Hey, remember to tell your friends about !')

Javascript css html tutorial