Membuat Efek Kaca Pembesar Menggunakan jQuery

Magnify glass atau efek kaca pembesar persis seperti anda menggunakan kaca pembesar pada saat mengamati sebuah benda, efek ini akan berkerja ketika gambar saat di hover atau cursor berada di atas gambar. Untuk lebih jelasnya anda bisa melihat screnshot di bawah ini atau melihat Demo-nya.

Demo   CODE

Efek kaca pembesar ditampilkan dengan box-shadow dan border-radius CSS3 dan jQuery digunakan untuk mengatur gambar agar berada pada posisi sebenarnya. Pada efek kaca pembesar terdapat dua penempatan gambar yang nantinya menampilkan Magnifer glass. CSS merupakan pengaturan untuk menampilkan gambar kecilnya dan pada kode HTML untuk menampilkan gambar yang sesungguhnya ketika anda menghover gambar tersebut.

Mungkin sedikit penjelasan diatas masih membuat anda belum memahaminya, untuk lebih jelasnya silahkan anda memperaktikannya :

HTML

<!-- Lets make a simple image magnifier -->
<div class="magnify">
<!-- This is the magnifying glass which will contain the original/large version -->
<div class="large">
</div>
<!-- This is the small image -->
<img class="small" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEhJYhT0cWOQYosia4I8a6egup5UeQZxCHYt37c_R1Xs-lA5AWhRNDC6e1Id8dIyoZS1A1sb38nc20ZJBOXHl-TO8LuLfYfp8oX9fQNvYSSYPDjGVvtG1XuyIceHtZhhkyWQxoAT7ljDyDro/s1600/Transformer.png" width="200" />
</div>

CSS

/*Magnify glass*/
* {margin: 0; padding: 0;}
.magnify {width: 200px; margin: 50px auto; position: relative;}
/*Lets create the magnifying glass*/
.large {
width: 175px; height: 175px;
position: absolute;
border-radius: 100%;
/*Multiple box shadows to achieve the glass effect*/
box-shadow: 0 0 0 7px rgba(255, 255, 255, 0.85),
0 0 7px 7px rgba(0, 0, 0, 0.25),
inset 0 0 40px 2px rgba(0, 0, 0, 0.25);
/*Lets load up the large image first*/
background: url('https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEhJYhT0cWOQYosia4I8a6egup5UeQZxCHYt37c_R1Xs-lA5AWhRNDC6e1Id8dIyoZS1A1sb38nc20ZJBOXHl-TO8LuLfYfp8oX9fQNvYSSYPDjGVvtG1XuyIceHtZhhkyWQxoAT7ljDyDro/s1600/Transformer.png') no-repeat;
/*hide the glass by default*/
display: none;
}
/*To solve overlap bug at the edges during magnification*/
.small { display: block; }

jQuery

$(document).ready(function(){
var native_width = 0;
var native_height = 0;
//Now the mousemove function
$(".magnify").mousemove(function(e){
//When the user hovers on the image, the script will first calculate
//the native dimensions if they don't exist. Only after the native dimensions
//are available, the script will show the zoomed version.
if(!native_width && !native_height)
{
//This will create a new image object with the same image as that in .small
//We cannot directly get the dimensions from .small because of the
//width specified to 200px in the html. To get the actual dimensions we have
//created this image object.
var image_object = new Image();
image_object.src = $(".small").attr("src");
//This code is wrapped in the .load function which is important.
//width and height of the object would return 0 if accessed before
//the image gets loaded.
native_width = image_object.width;
native_height = image_object.height;
}
else
{
//x/y coordinates of the mouse
//This is the position of .magnify with respect to the document.
var magnify_offset = $(this).offset();
//We will deduct the positions of .magnify from the mouse positions with
//respect to the document to get the mouse positions with respect to the
//container(.magnify)
var mx = e.pageX - magnify_offset.left;
var my = e.pageY - magnify_offset.top;
//Finally the code to fade out the glass if the mouse is outside the container
if(mx < $(this).width() && my < $(this).height() && mx > 0 && my > 0)
{
$(".large").fadeIn(100);
}
else
{
$(".large").fadeOut(100);
}
if($(".large").is(":visible"))
{
//The background position of .large will be changed according to the position
//of the mouse over the .small image. So we will get the ratio of the pixel
//under the mouse pointer with respect to the image and use that to position the
//large image inside the magnifying glass
var rx = Math.round(mx/$(".small").width()*native_width - $(".large").width()/2)*-1;
var ry = Math.round(my/$(".small").height()*native_height - $(".large").height()/2)*-1;
var bgp = rx + "px " + ry + "px";
//Time to move the magnifying glass with the mouse
var px = mx - $(".large").width()/2;
var py = my - $(".large").height()/2;
//Now the glass moves with the mouse
//The logic is to deduct half of the glass's width and height from the
//mouse coordinates to place it with its center at the mouse coordinates
//If you hover on the image now, you should see the magnifying glass in action
$(".large").css({left: px, top: py, backgroundPosition: bgp});
}
}
})
})

Magnify glass dibuat dengan efek jQuery dan CSS3, pembuat kode ini adalah ruby_on_tails for TheCodePlayer.

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