I have prepared some basic HTML with a little bit of styling so we can put the onclick event into real-world practice. The keys are returned in the order they were inserted. In JavaScript, you invoke a function by calling its name, then you put a parenthesis after the function identifier (the name). The Map.keys() method is used to extract the keys from a given map object and return the iterator object of keys. The following example map shows the boundaries for Administrative Area Level 2, and shows an event handler that styles the clicked polygon, and displays an info window with the event data. The value it takes, which is the function you want to execute, says it all, as it is invoked right within the opening tag. You can make a feature layer respond to user click events, to get the place ID, display name, and feature type for the boundary that was clicked. The tag defines an area inside an image-map (an image-map is an image with clickable areas). Note that the onclick attribute is purely JavaScript. You place the JavaScript function you want to execute inside the opening tag of the button. This could be when a user submits a form, when you change certain content on the web page, and other things like that. The onclick event executes a certain functionality when a button is clicked. How to Use the onclick event in JavaScript Then we'll see how the more modern "click" eventListner works, which lets you separate the HTML from the JavaScript. In this tutorial, we are going to explore the two different ways of executing click events in JavaScript using two different methods.įirst, we'll look at the traditional onclick style that you do right from the HTML page. Buttons, on the other hand, are usually manipulated by JavaScript events so they can trigger certain functionality. Links take you to a certain part of the page, another page of the website, or another website entirely. Whenever you visit a website, you'll probably click on something like a link or button.
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