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Any Idea how to zoom in a image on particular point using javascript, css ? I am using webkit based browser.
I can zoom by specifying zoom property , like `elem.style.zoom="150%", Main problem is I cannot center the image where I want to zoom. I can get the point where I want to zoom using mouseclick.
227
As I said in my comment above, I would avoid the zoom css property and stick to just javascript. I managed to throw together the following code which works pretty well for the first click, really all it needs is a little more dynamically (even a word?).
<html>
<head>
<script type="text/javascript">
function resizeImg (img)
{
var resize = 150; // resize amount in percentage
var origH = 200; // original image height
var origW = 200; // original image width
var mouseX = event.x;
var mouseY = event.y;
var newH = origH * (resize / 100) + "px";
var newW = origW * (resize / 100) + "px";
// Set the new width and height
img.style.height = newH;
img.style.width = newW;
var c = img.parentNode;
// Work out the new center
c.scrollLeft = (mouseX * (resize / 100)) - (newW / 2) / 2;
c.scrollTop = (mouseY * (resize / 100)) - (newH / 2) / 2;
}
</script>
<style type="text/css">
#Container {
position:relative;
width:200px;
height:200px;
overflow:hidden;
}
</style>
</head>
<body>
<div id="Container">
<img alt="Click to zoom" onclick="resizeImg(this)"
src="https://picsum.photos/200" />
</div>
</body>
</html>It works in Google Chrome and IE, not sure about others. Like I said hopefully it will point you in the right direction.
80
What has to be done.
if you do not mind using jQuery for it then use the following (tested)
<script type="text/javascript">
$(document).ready(
function(){
$('#Container img').click(
function( event ){
var scale = 150/100;
var pos = $(this).offset();
var clickX = event.pageX - pos.left;
var clickY = event.pageY - pos.top;
var container = $(this).parent().get(0);
$(this).css({
width: this.width*scale,
height: this.height*scale
});
container.scrollLeft = ($(container).width() / -2 ) + clickX * scale;
container.scrollTop = ($(container).height() / -2 ) + clickY * scale;
}
);
}
);
</script>
and the html needed
<div id="Container">
<img alt="Click to zoom" src="http://sstatic.net/so/img/logo.png" />
</div>
In following code, the image is amplified at the mouse click point - the image is amplified, but the point where you clicked remains under your mouse cursor, and the size of the frame remains the same. Right-click to go back to original display ratio.
<!DOCTYPE html>
<html>
<head>
<meta name="viewport" content="width=device-width" />
<title>Index</title>
<style>
div {
width: 400px;
height: 600px;
overflow: hidden;
}
img {
position: relative
}
</style>
<script src="http://code.jquery.com/jquery-1.7.2.js"></script>
<script type="text/javascript">
var imageOffset_x = 0;
var imageOffset_y = 0;
function onZoom()
{
var mouseInFrame_x = event.x;
var mouseinFrame_y = event.y;
var mouseInImage_x = imageOffset_x + mouseInFrame_x;
var mouseInImage_y = imageOffset_y + mouseinFrame_y;
imageOffset_x += mouseInImage_x * 0.16;
imageOffset_y += mouseInImage_y * 0.16;
var image = $('#container img');
var imageWidth = image.width();
var imageHeight = image.height();
image.css({
height: imageHeight * 1.2,
width: imageWidth * 1.2,
left: -imageOffset_x,
top: -imageOffset_y
});
}
function onRightClick() {
imageOffset_x = 0;
imageOffset_y = 0;
$('#container img').css({
height: 600,
width: 400,
left: 0,
top: 0
});
return false;
}
</script>
</head>
<body>
<a id="zoom" href="#" onclick="onZoom();">Zoom</a>
<div id="container">
<img src="~/Images/Sampple.jpg" width="400" height="600" onclick="onZoom();" oncontextmenu="onRightClick(); return false;"/>
</div>
</body>
</html>
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