Remember that it's called when a user clicks on the button, that is, interacts with a web page. The JavaScript function changecolor is shown here. Let's take a look at that function by looking at the JavaScript. In this example, the JavaScript function is called changecolor. That makes it possible to change the features of an element as we'll see. You'll be able to use JavaScript to access the div or whatever other element you tagged with the ID d1.
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Recall that the onclick event attribute tells the page to create an event handler to execute the JavaScript code that follows. The other, which displays Goodbye, has the ID d2. One, which displays Hello, has the ID d1 as you can see here. You may remember that each div has a different ID. We'll explore this at a high level and then look at the details. The basic idea is to programmatically access each div using the IDs, and change the CSS associated with the div.
By clicking a button, you'll use JavaScript to assign a CSS class to each div, making the divs change appearance, and go from no background color to different background colors. We'll use two CSS classes, each specify a different background color for a div. Let's look at a simple example of changing a web page using interactive JavaScript. It's also possible to change the text displayed in an element or other features. This will allow you to change the background color or the width or the height of an element.
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In our examples, you'll see how to add a CSS class to an HTML element like a div. In contrast, many elements can share the same class. We'll mostly use IDs to access HTML elements since IDs are distinct and every element must have a distinct ID. It's also possible to access individual elements by an ID or a group of elements by a class. It's possible to access all the elements with an h1 tag, for example, or with an li tag or any other HTML tag. To change a page, you'll need to write JavaScript code to access elements like h1 tags or div elements or other tagged elements in a page. This interactivity will be the basis for programming a green screen algorithm in a web page and for being creative in designing your own web page.
Let's look at how to change a web page interactively using JavaScript.
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