All of our add-ons include Unlimited texting and calling to the USA & Canada. Use CSS pseudo-classes (:hover, :focus, and :active) to make the button change its appearance when users hover over it with a mouse or tab to it with keyboard.TextNow's technology makes phone service ultra-affordable! If you have a compatible phone you can use with TextNow, you can activate it with our Nationwide Talk & Text plan plus add on any extra features like no ads or data! We'll check to make sure your phone is compatible and free for use before we charge you, so if you're unsure if your phone can be used, it's safe to enter your phone's information. If a user navigates to the button using the tab key, then presses enter, that too will trigger the alert.Īfter you have added the button, add a new element to the head section of your page, and add a new style for the button element. The onclick event also works for keyboard users. The button includes the onclick attribute, which causes the showAlert() to be called when a user clicks the button. This new code adds a button to your web page. Add the following HTML element anywhere within the body of your web page:.Remove the onload="showAlert()" attribute from the element.For example, we might to display the alert only if a user clicks on a button. However, we could trigger it using other events instead. So far in this lesson, we have called the showAlert() function when the body of the web page is loaded. Try modifying your showAlert() script with your own custom alert message. Var myText = "This can be whatever text you like!" Take a look at the following example, which uses a variable named myText to customize the text that's displayed in the alert box. In PHP, variable names must start with a $, but that isn't the case in JavaScript. In our earlier PHP example, we used the variable $thisPage to control certain features in the showTop() function. Once you have it working, move on to the next section.Īs mentioned in Beyond HTML, a variable in a programming or scripting language is a symbolic name that represents a value. (The next lesson will talk more about debugging). Programming languages can be very picky about seemingly small mistakes. Be sure you typed everything exactly as it appears, including capitalization and punctuation. Try adding the above to your web page, then load the page and see if it works. One way to do that is to add the onload attribute to the element of our web page, like this: We can instruct JavaScript to watch for these events, and if or when they occur, execute the specified function.įor example, let's say we want to execute the showAlert() function after the body of the web page is fully loaded. When the page loads, or when a user clicks on, hovers over, or tabs to a specific link, these are all events. JavaScript functions are called in response to events. This function will display text in a dialog box that pops up on the screen.īefore this function can work, we must first call the showAlert() function. One useful function that's native to JavaScript is the alert() function. Most programming or scripting languages are similar to one another, including PHP and JavaScript, but there are subtle differences in their syntax (the rules of how the code must be written). Notice that it looks a lot like the PHP showTop() and showBottom() functions that were explained in the Beyond HTML document that you studied in the previous lesson. Start by opening your portfolio file javascript.html using your preferred text editor.Īdd the following JavaScript code to the section of your web page: You will start by writing a simple script, then gradually build upon that script, adding more functionality to it in subsequent lessons.
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