![]() ![]() That way, we can call the function when we want it to run: like we did with alert before, but with a function we have created. In order to do this, we will wrap our code up in a function. We want to be able to attach behaviour to things the user does. We don't really want all of our code to run at the moment the page loads. This course covers basic JavaScript ideas, similar to what we're doing here (and as we continue). Controlling Execution: Functions and Events course: JavaScript Essential Training. js file and see how the behaviour changes. Add another call to the alert function in the. Try saving these files: the HTML page and the JavaScript. In the case of alert, we give it the string (in quotes) that shold be displayed in the alert message. In the parenthesis, we put whatever arguments the function needs to run. ![]() When we mention a function by name with parenthesis after it, we are indicating that we want to call the function. ![]() The alert function is built into JavaScript we will define functions of our own very soon. A function represents some logic that we can run by calling the function. In this code, alert is a JavaScript function. When you click OK, the browser will continue. You can have a look at an HTML page with that and see what happens.Īs the page loads, the browser runs that one line of JavaScript code, which causes an alert message to appear (before the rest of the page loads, since the element comes before the rest ofthe page). That one line will run when the browser processes the element. As a first step, here is a line of code that can go in our first-code.js file: alert('Hello world!') Now that we can tell the browser about a JavaScript file, we should actually write some code. This element causes the browser to load the code from the relative URL mycode.js and execute it. The tag has no contents (the end tag comes immediately after the start tag). JavaScript is a cross-platform, object-oriented scripting language. We can link this to a web page like this: … Discover the Basics of JavaScript Describe variables Explore data structures and. We will usually write JavaScript code in separate files named something.js. ![]() When the browser encounters, it will load and run the code (similar to the way it loads stylesheets for or images for The element is used to connect JavaScript to HTML pages. ![]()
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