They do the same thing for programming that ready-made furniture kits do for home building - it is much easier to take ready-cut panels and screw them together to make a bookshelf than it is to work out the design yourself, go and find the correct wood, cut all the panels to the right size and shape, find the correct-sized screws, and then put them together to make a bookshelf.īrowser APIs are built into your web browser, and are able to expose data from the surrounding computer environment, or do useful complex things. So-called Application Programming Interfaces ( APIs) provide you with extra superpowers to use in your JavaScript code.ĪPIs are ready-made sets of code building blocks that allow a developer to implement programs that would otherwise be hard or impossible to implement. What is even more exciting however is the functionality built on top of the client-side JavaScript language. We used a click event in our example above to detect when the button is clicked and then run the code that updates the text label. Running code in response to certain events occurring on a web page.In the above example we take the string "Player 1: " and join it to the name variable to create the complete text label, e.g.
Operations on pieces of text (known as "strings" in programming).In the above example for instance, we ask for a new name to be entered then store that name in a variable called name. The core client-side JavaScript language consists of some common programming features that allow you to do things like: We can mark it up using HTML to give it structure and purpose: Let's take a simple text label as an example. The three layers build on top of one another nicely. (Okay, not everything, but it is amazing what you can achieve with a few lines of JavaScript code.) JavaScript is a scripting language that enables you to create dynamically updating content, control multimedia, animate images, and pretty much everything else.CSS is a language of style rules that we use to apply styling to our HTML content, for example setting background colors and fonts, and laying out our content in multiple columns.HTML is the markup language that we use to structure and give meaning to our web content, for example defining paragraphs, headings, and data tables, or embedding images and videos in the page.It is the third layer of the layer cake of standard web technologies, two of which ( HTML and CSS) we have covered in much more detail in other parts of the Learning Area. you can bet that JavaScript is probably involved. JavaScript is a scripting or programming language that allows you to implement complex features on web pages - every time a web page does more than just sit there and display static information for you to look at - displaying timely content updates, interactive maps, animated 2D/3D graphics, scrolling video jukeboxes, etc.
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