<link href="//netdna.bootstrapcdn.com/bootstrap/3.0.0/css/bootstrap.min.css" rel="stylesheet" id="bootstrap-css">
<script src="//netdna.bootstrapcdn.com/bootstrap/3.0.0/js/bootstrap.min.js"></script>
<script src="//code.jquery.com/jquery-1.11.1.min.js"></script>
<!------ Include the above in your HEAD tag ---------->
<ul class="rslides">
<li class="image-w">
<img class="magniflier" src="https://s3-us-west-2.amazonaws.com/s.cdpn.io/4543/03.jpg" />
</li>
<li class="image-w">
<img class="magniflier" src="http://placehold.it/1200x800" />
</li>
</ul>
<script>
$(function() {
var native_width = 0;
var native_height = 0;
var mouse = {x: 0, y: 0};
var magnify;
var cur_img;
var ui = {
magniflier: $('.magniflier')
};
// Add the magnifying glass
if (ui.magniflier.length) {
var div = document.createElement('div');
div.setAttribute('class', 'glass');
ui.glass = $(div);
$('body').append(div);
}
// All the magnifying will happen on "mousemove"
var mouseMove = function(e) {
var $el = $(this);
// Container offset relative to document
var magnify_offset = cur_img.offset();
// Mouse position relative to container
// pageX/pageY - container's offsetLeft/offetTop
mouse.x = e.pageX - magnify_offset.left;
mouse.y = e.pageY - magnify_offset.top;
// The Magnifying glass should only show up when the mouse is inside
// It is important to note that attaching mouseout and then hiding
// the glass wont work cuz mouse will never be out due to the glass
// being inside the parent and having a higher z-index (positioned above)
if (
mouse.x < cur_img.width() &&
mouse.y < cur_img.height() &&
mouse.x > 0 &&
mouse.y > 0
) {
magnify(e);
}
else {
ui.glass.fadeOut(100);
//ui.glass.hide();
}
return;
};
var magnify = function(e) {
// The background position of div.glass will be
// changed according to the position
// of the mouse over the img.magniflier
//
// So we will get the ratio of the pixel
// under the mouse with respect
// to the image and use that to position the
// large image inside the magnifying glass
var rx = Math.round(mouse.x/cur_img.width()*native_width - ui.glass.width()/2)*-1;
var ry = Math.round(mouse.y/cur_img.height()*native_height - ui.glass.height()/2)*-1;
var bg_pos = rx + "px " + ry + "px";
// Calculate pos for magnifying glass
//
// Easy Logic: Deduct half of width/height
// from mouse pos.
// var glass_left = mouse.x - ui.glass.width() / 2;
// var glass_top = mouse.y - ui.glass.height() / 2;
var glass_left = e.pageX - ui.glass.width() / 2;
var glass_top = e.pageY - ui.glass.height() / 2;
//console.log(glass_left, glass_top, bg_pos)
// Now, if you hover on the image, you should
// see the magnifying glass in action
ui.glass.css({
left: glass_left,
top: glass_top,
backgroundPosition: bg_pos
});
return;
};
$('.magniflier').on('mousemove', function() {
ui.glass.fadeIn(200);
/*ui.glass.show();*/
cur_img = $(this);
var large_img_loaded = cur_img.data('large-img-loaded');
var src = cur_img.data('large') || cur_img.attr('src');
// Set large-img-loaded to true
// cur_img.data('large-img-loaded', true)
if (src) {
ui.glass.css({
'background-image': 'url(' + src + ')',
'background-repeat': 'no-repeat'
});
}
// 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) {
if (!cur_img.data('native_width')) {
// 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.onload = function() {
// 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;
cur_img.data('native_width', native_width);
cur_img.data('native_height', native_height);
//console.log(native_width, native_height);
mouseMove.apply(this, arguments);
ui.glass.on('mousemove', mouseMove);
};
image_object.src = src;
return;
} else {
native_width = cur_img.data('native_width');
native_height = cur_img.data('native_height');
}
//}
//console.log(native_width, native_height);
mouseMove.apply(this, arguments);
ui.glass.on('mousemove', mouseMove);
});
ui.glass.on('mouseout', function() {
ui.glass.off('mousemove', mouseMove);
});
});
$(".rslides").responsiveSlides({
auto: false, // Boolean: Animate automatically, true or false
speed: 500, // Integer: Speed of the transition, in milliseconds
timeout: 4000, // Integer: Time between slide transitions, in milliseconds
pager: true, // Boolean: Show pager, true or false
nav: false, // Boolean: Show navigation, true or false
random: false, // Boolean: Randomize the order of the slides, true or false
pause: false, // Boolean: Pause on hover, true or false
pauseControls: true, // Boolean: Pause when hovering controls, true or false
prevText: "Previous", // String: Text for the "previous" button
nextText: "Next", // String: Text for the "next" button
maxwidth: "", // Integer: Max-width of the slideshow, in pixels
navContainer: "", // Selector: Where controls should be appended to, default is after the 'ul'
manualControls: "", // Selector: Declare custom pager navigation
namespace: "rslides", // String: Change the default namespace used
before: function(){}, // Function: Before callback
after: function(){} // Function: After callback
});
</script>
.image-w {
max-width: 400px;
}
.image-w img {
display: block;
width: 100%;
height: auto;
}
.magniflier {
border: 3px solid red;
}
.glass {
width: 15em;
height: 15em;
position: absolute;
border-radius: 50%;
cursor: none;
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);
/* hide the glass by default */
display: none;
z-index: 2;
}
.rslides {
position: relative;
list-style: none;
overflow: hidden;
width: 100%;
padding: 0;
margin: 0;
}
.rslides li {
-webkit-backface-visibility: hidden;
position: absolute;
display: none;
width: 100%;
left: 0;
top: 0;
}
.rslides li:first-child {
position: relative;
display: block;
float: left;
}
.rslides img {
display: block;
height: auto;
float: left;
width: 100%;
border: 0;
}
