PRAKTIK WEB DESAIN 2
Latihan - JavaScript
<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8">
<title>Untitled Document</title>
</head>
<body>
<h2>JavaScript in Body</h2>
<p id="demo"></p>
<script>
document.getElementById("demo").innerHTML = "My First JavaScript";</script>
</body>
</html>
1. Cara membuat Window Alert
<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8">
<title>Untitled Document</title>
</head>
<body>
<p>Click the button to display an alert box.</p>
<button onClick="myFunction()">Try it</button>
<script>
function myFunction(){
alert("Hello! I am an alert box!");
}
</script>
</body>
</html>
2. Cara membuat JS Alert
<!DOCTYPE html>
<html>
<head>
<script>
function validateForm(){
var x = document.forms["myFrom"]["fname"].value;
if (x == ""){
alert("Name must be filled out");
return false;
}
}
</script>
</head>
<body>
<h1> Js Alert </h1>
<form name="myForm" action="/action_page_post.php" onSubmit="return validateForm()" method="post">
Name: <input type="text" name="fname">
<input type="submit" value="Submit">
</form>
</body>
</html>
3. Cara membuat Validate Input
<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8">
<title>Untitled Document</title>
</head>
<body>
<h2>JavaScript Can Validate Input</h2>
<p>Please input a number between 1 and 10:</p>
<input id="numb">
<button type="button"
onClick="myFunction()">Submit</button>
<p id="demo"></p>
<script>
function myFunction(){
var x, text;
// Get the value of the input field with id="numb"
x = document.getElementById("numb").value;
// If x is Not a Number or less than one or greater than 10
if (isNaN(x) || x < 1 || x > 10){
text = "Input not valid";
} else {
text = "Input OK";
}
document.getElementById("demo").innerHTML = text;
}
</script>
</body>
</html>
CONTOH HASIL :
<html>
<head>
<style>
#myBtn{
dsiplay: none;
position: fixed;
bottom: 20px;
right: 30px;
z-index: 99;
border: none;
outline: none;
background-color: red;
color: white;
cursor: pointer;
padding: 15px;
border-radius: 10px;
}
#myBtn:hover {
background-color: #555;
}
</style>
</head>
<body>
<button onClick="topFunction()" id="myBtn" title="Go to top">Top</button>
<div style="background-color:black;color:white;padding:30px">Scroll Down</div>
<div style="background-color:lightgrey;padding:30px 30px 2500px">This example demonstrates how to create a "scroll a top" button that becoms visible when the user strats to scroll the page.</div>
<script>
// When the user scrolls down 20px from the top of the document, show the button
window.onscroll = function() {scrollFunction()};
function scrollFunction(){
if(document.body.scrollTop > 20 || document.documentElement.scrollTop > 20){
document.getElementById("myBtn").style.display = "block";
} else {
document.getElementById("myBtn").style.display = "none";
}
}
// When the user clicks on the button, scroll to the top of the document
function myFunction(){
document.body.scrollTop = "0";
document.documentElement.scrollTop = "0";
}
</script>
</body>
</html>
5. Cara membuat Like / DisLike
color: darkblue;
}
</style>
</head>
<body>
<h1></h1>
<p>Click on the icon to toggle between thumbs-up and thumbs-down (like/dislike):</p>
<i onClick="myFunction(this)" class="fa fa-thumbs-up"></i>
<script>
function myFunction(x){
x.classList.toggle("fa-thumbs-down");
}
</script>
</body>
</html>
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