What Can You Do with JavaScript? Explore Its Capabilities

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JS Basic Tutorial

Introduction

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JavaScript Operators

JS Arithmetic Operators

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JS Comparison Operators

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JS Ternary Operator

JS Bitwise Operators

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JS Nullish Coalescing Operator

JS Optional Chaining Operator

What Can You Do

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1. Modify HTML Content Dynamically

JavaScript can change or update the content of HTML elements after the page has been loaded.

Example

<!DOCTYPE html>

<html>

<head>

<title>Can Change Html Content</title>

</head>

<body>

<p id="myText">Original Text</p>

<button onclick="document.getElementById('myText').innerHTML = 'Updated Text!'">Change Text</button>

document.getElementById("myText").innerHTML = "New Text!";

</script>

</body>

</html>

Try it yourself

2. Can change html attribute values

JavaScript can change or update the attributes of HTML elements.

Example

<!DOCTYPE html>

<head>

function modify() {

// Update style attribute of element "heading"

let heading = document.getElementById("heading");

heading.setAttribute("style", "color:green");

}

</script>

</head>

<body>

WhereisStuff

</h1>

Click to modify

</button>

</body>

</html>

Try it yourself

3. Style Manipulation (CSS Styling)

JavaScript can dynamically change the style of HTML elements by modifying CSS properties.

Example

<!DOCTYPE html>

<html>

<head>

<title>Can Change CSS Property</title>

<style>

.highlight { background-color: yellow; }

</style>

</head>

<body>

<div id="myElement" class="box">Click me</div>

<button onclick="document.getElementById('myElement').classList.toggle('highlight')">Toggle Highlight</button>

document.getElementById("myElement").style.color = "blue";

</script>

</body>

</html>

Try it yourself

4. Can Hide HTML Elements

Hiding HTML elements can be done by changing the display style

Example

<!DOCTYPE html>

<html>

<body>

<h2>What Can JavaScript Do?</h2>

<p id="demo">JavaScript can hide HTML elements.</p>

<button type="button" onclick="document.getElementById('demo').style.display='none'">Click Me!</button>

</body>

</html>

Try it yourself

5. Can Show HTML Elements

Showing hidden HTML elements can also be done by changing the display style

Example

<!DOCTYPE html>

<html>

<body>

<h2>What Can JavaScript Do?</h2>

<p>JavaScript can show hidden HTML elements.</p>

<p id="demo" style="display:none">Hello JavaScript!</p>

<button type="button" onclick="document.getElementById('demo').style.display='block'">Click Me!</button>

</body>

</html>

Try it yourself

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