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JS mouse wheel zoom picture (compatible IE, Chrome, Firefox)

Source: Internet
Author: User
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I used the simplest one to use the OnMouseWheel command directly

The code is as follows Copy Code

<script language= "JavaScript" >
<!--
Change picture size
function Resizepic (thispic) {
if (thispic.width>700) thispic.width=700;
}
stepless scale picture size
function Bbimg (o) {
var zoom=parseint (o.style.zoom,10) | | 100;
ZOOM+=EVENT.WHEELDELTA/12;
if (zoom>0) o.style.zoom=zoom+ '% ';
return false;
}
-->
</script>


Example 1

Ie6-8,ff,chrome,opera,safari can be used.

The code is as follows Copy Code

var zooming=function (e) {
e=window.event | | E
var O=this,data=e.wheeldelta | | E.detail*40,zoom,size;
if (!+ ' v1 ') {
Zoom = parseint (o.style.zoom) | | 100;
Zoom + = DATA/12;
if (Zoom > Zooming.min)
O.style.zoom = zoom + '% ';
} else {
Size=o.getattribute ("_zoomsize"). Split (",");
Zoom=parseint (O.getattribute ("_zoom")) | | 100;
ZOOM+=DATA/12;
if (zoom>zooming.min) {
O.setattribute ("_zoom", zoom);
o.style.width=size[0]*zoom/100+ "px";
o.style.height=size[1]*zoom/100+ "px";
}
}
};
Zooming.add=function (obj,min) {//The first parameter specifies a picture that can be scaled, min specifies the minimum scale size, default to 50
Zooming.min=min | | 50;
obj.onmousewheel=zooming;
if (/a/[-1]== ' a ')//if Firefox
Obj.addeventlistener ("Dommousescroll", Zooming,false);
if (-[1,]) {//if not IE
Obj.setattribute ("_zoomsize", obj.offsetwidth+ "," +obj.offsetheight);
}
};

Window.onload=function () {//Put in onload, otherwise the picture size error cannot be computed in non IE
Zooming.add (document.getelementbyidx_x ("TESTIMG1"));
}

Example 2

The code is as follows Copy Code
<script type= "Text/javascript" >
function Resizeimg (imgd,iwidth,iheight) {
var image=new image ();
IMAGE.SRC=IMGD.SRC;
if (image.width>0 && image.height>0) {
if (image.width/image.height>= iwidth/iheight) {
if (image.width>iwidth) {
Imgd.width=iwidth;
imgd.height= (image.height*iwidth)/image.width;
}else{
Imgd.width=image.width;
Imgd.height=image.height;
}
imgd.alt=image.width+ "X" +image.height;
}
else{
if (image.height>iheight) {
Imgd.height=iheight;
Imgd.width= (image.width*iheight)/image.height;
}else{
Imgd.width=image.width;
Imgd.height=image.height;
}
imgd.alt=image.width+ "X" +image.height;
}
imgd.style.cursor= "Pointer"; Change the mouse pointer
if (Navigator.userAgent.toLowerCase (). IndexOf ("ie") >-1) {//Judging browser, if it is IE
Imgd.title = "Please use the mouse wheel to zoom picture";
Imgd.onmousewheel = function img_zoom ()//Wheel Zoom
{
var zoom = parseint (This.style.zoom, 10) | | 100;
Zoom + = EVENT.WHEELDELTA/12;
if (zoom> 0) this.style.zoom = zoom + "%";
return false;
}
}
}
}
</script>
<body>
Example:

</body>

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Related Keywords:
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