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Basics of Javascript

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By Emmanuel Chinonso

Web Developer

Basics of JavaScript

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We'll look at some examples of what JavaScript can accomplish. If you don't understand the code, don't worry. The purpose of this chapter is to show you what JavaScript can do.

JavaScript Can Change HTML Content

getElementById is one of numerous JavaScript HTML methods (). The following example "finds" an HTML element (with id="demo") and replaces its content (innerHTML) with "Hello JavaScript":

Code:

1document.getElementById('demo').innerHTML = 'Hello JavaScript';

Or

1document.getElementById('demo').innerHTML = 'Hello JavaScript';

JavaScript can take both single and double quotes.

JavaScript Can Change HTML Attribute Values In this example, JavaScript modifies the value of a "src" attribute of an <img> tag Images

JavaScript Can Change HTML Styles (CSS) Modifying an HTML element's style is similar to changing an HTML attribute: Code:

1document.getElementById('demo').style.fontSize = '35px';

JavaScript Can Hide HTML Elements Changing the display style can be used to hide HTML elements:

Code:

1<p id="example-4">I will disappear!</p>
2<button type="button" onclick="document.getElementById('example-4').style.display='none'">Click Me!</button>

JavaScript Can Show HTML Elements

Changing the display style can also be used to reveal hidden HTML elements:

Code:

1document.getElementById('demo').style.display = 'block';

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