Untuk artikel kali ini kita akan coba membuat efek loading konten dengan menggunakan JavaScript, jadi seperti ini cara kerjanya disaat kita melakukan scroll sebuah halaman web, kita memberikan indikator tambahan, untuk mengetahui sudah sejauh mana, posisi kita berada saat melakukan scroll halaman.
Untuk lebih jelasnya kita coba praktekkan, buatlah file index.html lalu isikan kode berikut:
<div class="header">
<h2>Scroll Indicator</h2>
<div class="progress-container">
<div class="progress-bar" id="myBar"></div>
</div>
</div>
<div class="content">
<h3>Scroll Down to See The Effect</h3>
<p>We have created a "progress bar" to <b>show how far a page has been scrolled</b>.</p>
<p>It also <b>works when you scroll back up</b>.</p>
<p>It is even <b>responsive</b>! Resize the browser window to see the effect.</p>
<p>Some text to enable scrolling.. Lorem ipsum dolor sit amet, illum definitiones no quo, maluisset concludaturque et eum, altera fabulas ut quo. Atqui causae gloriatur ius te, id agam omnis evertitur eum. Affert laboramus repudiandae nec et. Inciderint efficiantur his ad. Eum no molestiae voluptatibus.</p>
<p>Some text to enable scrolling.. Lorem ipsum dolor sit amet, illum definitiones no quo, maluisset concludaturque et eum, altera fabulas ut quo. Atqui causae gloriatur ius te, id agam omnis evertitur eum. Affert laboramus repudiandae nec et. Inciderint efficiantur his ad. Eum no molestiae voluptatibus.</p>
<p>Some text to enable scrolling.. Lorem ipsum dolor sit amet, illum definitiones no quo, maluisset concludaturque et eum, altera fabulas ut quo. Atqui causae gloriatur ius te, id agam omnis evertitur eum. Affert laboramus repudiandae nec et. Inciderint efficiantur his ad. Eum no molestiae voluptatibus.</p>
<p>Some text to enable scrolling.. Lorem ipsum dolor sit amet, illum definitiones no quo, maluisset concludaturque et eum, altera fabulas ut quo. Atqui causae gloriatur ius te, id agam omnis evertitur eum. Affert laboramus repudiandae nec et. Inciderint efficiantur his ad. Eum no molestiae voluptatibus.</p>
<p>Some text to enable scrolling.. Lorem ipsum dolor sit amet, illum definitiones no quo, maluisset concludaturque et eum, altera fabulas ut quo. Atqui causae gloriatur ius te, id agam omnis evertitur eum. Affert laboramus repudiandae nec et. Inciderint efficiantur his ad. Eum no molestiae voluptatibus.</p>
<p>Some text to enable scrolling.. Lorem ipsum dolor sit amet, illum definitiones no quo, maluisset concludaturque et eum, altera fabulas ut quo. Atqui causae gloriatur ius te, id agam omnis evertitur eum. Affert laboramus repudiandae nec et. Inciderint efficiantur his ad. Eum no molestiae voluptatibus.</p>
<p>Some text to enable scrolling.. Lorem ipsum dolor sit amet, illum definitiones no quo, maluisset concludaturque et eum, altera fabulas ut quo. Atqui causae gloriatur ius te, id agam omnis evertitur eum. Affert laboramus repudiandae nec et. Inciderint efficiantur his ad. Eum no molestiae voluptatibus.</p>
<p>Some text to enable scrolling.. Lorem ipsum dolor sit amet, illum definitiones no quo, maluisset concludaturque et eum, altera fabulas ut quo. Atqui causae gloriatur ius te, id agam omnis evertitur eum. Affert laboramus repudiandae nec et. Inciderint efficiantur his ad. Eum no molestiae voluptatibus.</p>
<p>Some text to enable scrolling.. Lorem ipsum dolor sit amet, illum definitiones no quo, maluisset concludaturque et eum, altera fabulas ut quo. Atqui causae gloriatur ius te, id agam omnis evertitur eum. Affert laboramus repudiandae nec et. Inciderint efficiantur his ad. Eum no molestiae voluptatibus.</p>
<p>Some text to enable scrolling.. Lorem ipsum dolor sit amet, illum definitiones no quo, maluisset concludaturque et eum, altera fabulas ut quo. Atqui causae gloriatur ius te, id agam omnis evertitur eum. Affert laboramus repudiandae nec et. Inciderint efficiantur his ad. Eum no molestiae voluptatibus.</p>
</div>
lalu dilanjutkan dengan membuat file css, kemudian tambahkan kode css berikut:
body {
margin: 0;
font-size: 28px;
font-family: Arial, Helvetica, sans-serif;
}
.header {
position: fixed;
top: 0;
z-index: 1;
width: 100%;
background-color: #f1f1f1;
}
.header h2 {
text-align: center;
}
.progress-container {
width: 100%;
height: 8px;
background: #ccc;
}
.progress-bar {
height: 8px;
background: #4caf50;
width: 0%;
}
.content {
padding: 100px 0;
margin: 50px auto 0 auto;
width: 80%;
}
tahapan selanjutnya sebagai aktivasi, efeks scroll kalian bisa menambahkan skrip berikut:
// When the user scrolls the page, execute myFunction
window.onscroll = function() {myFunction()};
function myFunction() {
var winScroll = document.body.scrollTop || document.documentElement.scrollTop;
var height = document.documentElement.scrollHeight - document.documentElement.clientHeight;
var scrolled = (winScroll / height) * 100;
document.getElementById("myBar").style.width = scrolled + "%";
}
Untuk hasilnya akan terlihat sebagai berikut:
silahkan bisa diunduh untuk file scroll indicator, link download ada dibawah berikut:
