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Js uses the slider to control the image size. js image size

Source: Internet
Author: User
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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.

This article is an English version of an article which is originally in the Chinese language on aliyun.com and is provided for information purposes only. This website makes no representation or warranty of any kind, either expressed or implied, as to the accuracy, completeness ownership or reliability of the article or any translations thereof. If you have any concerns or complaints relating to the article, please send an email, providing a detailed description of the concern or complaint, to info-contact@alibabacloud.com. A staff member will contact you within 5 working days. Once verified, infringing content will be removed immediately.

Related Keywords:
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