The example of this article tells JS to drag the slider to control the size of the image method. Share to everyone for your reference. The implementation methods are as follows:
<!doctype HTML PUBLIC "-//W3C//DTD HTML 4.0 transitional//en" >
<meta http-equiv=content-type content= "text/html;charset=gb2312" >
<title>js drag slider to control picture display size </title>
<style>
*{margin:0;padding:0;font-size:12px;}
. Btn{width:50px;height:15px;cursor:pointer;}
#picViewPanel {margin:5 0 50px; width:328px; height:248px;overflow:auto;text-align:center;border:solid 1px #cccccc;}
#slider {margin:0 50px;height:15px;width:328px;border:1px solid #000000;p osition:relative;}
#sliderLeft {height:13px; width:13px;float:left;border:1px solid #cccccc; cursor:pointer;}
#sliderBlock {height:13px;width:50px;border:1px solid #cccccc;p osition:absolute;top:0;left:113px;cursor:pointer; Background: #cccccc; text-align:center;}
#sliderRight {height:13px;width:13px;float:right;border:1px solid #cccccc; cursor:pointer;}
</style>
<body>
<div id= "Picviewpanel" ></div>
<div id= "Slider" >
<span id= "Sliderleft" ><<</span>
<span id= "Sliderright" >>></span>
<span id= "Sliderblock" >==</span>
</div>
</body>
<script>
Golbal
var PV = null;
var sd = null;
Window.onload=function () {
PV = new Picview ("/images/m01.jpg");
SD = new Slider (
Function (p) {
document.getElementById ("Sliderblock"). InnerHTML = 2*p + "%";
Pv.expand (2*p/100);
},function () {});
}
var Picview = function (Url,alt) {
This.url=url;
This.obj=null;
This.alt=alt?alt: "";
This.realwidth=null;
This.realheight=null;
This.zoom=1;
This.init ();
}
Picview.prototype.init=function () {
var _img=document.createelement ("img");
_IMG.SRC = This.url;
_img.alt = This.alt;
_img.style.zoom = This.zoom;
document.getElementById ("Picviewpanel"). AppendChild (_IMG);
this.obj=_img;
This.realwidth=_img.offsetwidth;
This.realheight=_img.offsetheight;
}
Picview.prototype.rebind=function () {
This.obj.style.width = this.realwidth*this.zoom+ "px";
This.obj.style.height = this.realheight*this.zoom+ "px";
This.obj.style.zoom = This.zoom;
}
Picview.prototype.expand=function (n) {
This.zoom=n;
This.rebind ();
}
var Slider = function (ing,ed) {
This.block=document.getelementbyid ("Sliderblock");
this.percent = 0;
this.value = 0;
this.ing = ing;
This.ed = ed;
This.init ();
}
Slider.prototype.init=function () {
var _sx=0;
var _cx=0;
var O=this.block;
var me=this;
O.onmousedown=function (e) {
var e=window.event| | E
_SX = O.offsetleft;
_CX = E.CLIENTX-_SX;
Document.body.onmousemove=move;
Document.body.onmouseup=up;
};
function Move (e) {
var e=window.event| | E
var pos_x = e.clientx-_cx;
pos_x=pos_x<13?13:pos_x;
pos_x=pos_x>248+15-50?248+15-50:pos_x;
O.style.left = pos_x+ "px";
Me.percent= (POS_X-13)/2;
Me.ing (me.percent);
}
function up () {
Document.body.onmousemove=function () {};
Document.body.onmouseup=function () {};
}
}
</script>
I hope this article will help you with your JavaScript programming.
