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Js uses the slider to control the image size. js image size
This document describes how to use the slider to control the image size in JavaScript. Share it with you for your reference. The specific implementation method is as follows:
Copy codeThe Code is as follows: <! Doctype html public "-// W3C // dtd html 4.0 Transitional // EN">
<Html>
<Head>
<Meta http-equiv = Content-Type content = "text/html; charset = gb2312">
<Title> js drag the slider to control the image display size </title>
<Style>
* {Margin: 0; padding: 0; font-size: 12px ;}
. Btn {width: 50px; height: 15px; cursor: pointer ;}
# PicViewPanel {margin: 5 50 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; position: relative ;}
# SliderLeft {height: 13px; width: 13px; float: left; border: 1px solid # cccccc; cursor: pointer ;}
# SliderBlock {height: 13px; width: 50px; border: 1px solid # cccccc; position: 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>
</Head>
<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>
</Html>
I hope this article will help you design javascript programs.
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