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javaScript实现可缩放的显示区效果代码

  作者：bea

本文实例讲述了javaScript实现可缩放的显示区效果代码。分享给大家供大家参考，具体如下： 这里演示可缩放的显示区，采用JS代码实现，鼠标按住区域的右下角，出现拖放箭头时，向下或向上拉，就可实现缩放操作，当区域较小时显示滚动条，平时也比较常见的效果，在此将JavaScript代码与大家分享。 运行效果截图如下： 在线演示地址如下： http://demo./js/2015/js-ksf-box-style-demo/ 具体代码如下： <HTML><

本文实例讲述了javaScript实现可缩放的显示区效果代码。分享给大家供大家参考，具体如下：


这里演示可缩放的显示区，采用JS代码实现，鼠标按住区域的右下角，出现拖放箭头时，向下或向上拉，就可实现缩放操作，当区域较小时显示滚动条，平时也比较常见的效果，在此将JavaScript代码与大家分享。


运行效果截图如下：



在线演示地址如下：


http://demo./js/2015/js-ksf-box-style-demo/


具体代码如下：




<HTML>

<HEAD>

<TITLE>可缩放的显示区</TITLE>

<STYLE type=text/css>

BODY {

 MARGIN-TOP: 0px; FONT-SIZE: 9pt; MARGIN-LEFT: 0px; MARGIN-RIGHT: 0px; FONT-FAMILY: "宋体"

}

A {

 FONT-WEIGHT: 400; FONT-SIZE: 9pt; COLOR: black; TEXT-DECORATION: none

}

A:hover {

 FONT-WEIGHT: 400; FONT-SIZE: 9pt; COLOR: red; TEXT-DECORATION: underline

}

A:active {

 FONT: 9pt "宋体"; CURSOR: hand; COLOR: #ff0033

}

.STYLE1 {font-family: "华文彩云", "华文仿宋", "华文细黑", "华文新魏", "华文行楷", "华文中宋", "新宋体", "幼圆"}

.STYLE2 {

 font-family: "方正姚体";

 font-weight: bold;

}

</STYLE>

<META http-equiv=Content-Type content="text/html; charset=gb2312">

</HEAD>

<BODY bgColor=#fef4d9>

<CENTER>

 <span class="STYLE1"><FONT color=black size=16>可缩放的显示区</FONT></span>

</CENTER><BR>

<CENTER>

<TABLE borderColor=#00FF00 border=5 borderlight="green">

 <TBODY>

 <TR>

 <TD align=left>

 <STYLE>UNKNOWN {

 box-sizing: border-box; moz-box-sizing: border-box

}

#testDiv {

 BORDER-RIGHT: white 2px outset; PADDING-RIGHT: 2px; BACKGROUND-POSITION: 0% 50%; BORDER-TOP: white 2px outset; PADDING-LEFT: 2px; Z-INDEX: 2; BACKGROUND-ATTACHMENT: scroll; LEFT: 30px; PADDING-BOTTOM: 2px; MARGIN: 0px; OVERFLOW: hidden; BORDER-LEFT: white 2px outset; WIDTH: 500px; COLOR: #3969a5; PADDING-TOP: 2px; BORDER-BOTTOM: white 2px outset; BACKGROUND-REPEAT: repeat; HEIGHT: 300px; BACKGROUND-COLOR: buttonface

}

BODY {

 FONT-SIZE: 9pt; FONT-FAMILY: Verdana

}

#innerNice {

 BORDER-RIGHT: white 2px inset; PADDING-RIGHT: 8px; BACKGROUND-POSITION: 0% 50%; BORDER-TOP: white 2px inset; PADDING-LEFT: 8px; BACKGROUND-ATTACHMENT: scroll; PADDING-BOTTOM: 8px; OVERFLOW: auto; BORDER-LEFT: white 2px inset; WIDTH: 100%; COLOR: #3969a5; PADDING-TOP: 8px; BORDER-BOTTOM: white 2px inset; BACKGROUND-REPEAT: repeat; HEIGHT: 100%; BACKGROUND-COLOR: white

}

</STYLE>

 <DIV class=resizeMe id=testDiv>

 <DIV id=innerNice>

 <P align=center>　</P>

 <P align=center>请在边框处拖动鼠标</P>

 <P>　</P>

 <P>　</P>

 <P>　</P></DIV></DIV>

 <SCRIPT language=javascript>

var theobject = null; //This gets a value as soon as a resize start

function resizeObject() {

 this.el = null; //pointer to the object

 this.dir = ""; //type of current resize (n, s, e, w, ne, nw, se, sw)

 this.grabx = null; //Some useful values

 this.graby = null;

 this.width = null;

 this.height = null;

 this.left = null;

 this.top = null;

}

function getDirection(el) {

 var xPos, yPos, offset, dir;

 dir = "";

 xPos = window.event.offsetX;

 yPos = window.event.offsetY;

 offset = 8; //The distance from the edge in pixels

 if (yPos<offset) dir += "n";

 else if (yPos > el.offsetHeight-offset) dir += "s";

 if (xPos<offset) dir += "w";

 else if (xPos > el.offsetWidth-offset) dir += "e";

 return dir;

}

function doDown() {

 var el = getReal(event.srcElement, "className", "resizeMe");

 if (el == null) {

  theobject = null;

  return;

 }  

 dir = getDirection(el);

 if (dir == "") return;

 theobject = new resizeObject(); 

 theobject.el = el;

 theobject.dir = dir;

 theobject.grabx = window.event.clientX;

 theobject.graby = window.event.clientY;

 theobject.width = el.offsetWidth;

 theobject.height = el.offsetHeight;

 theobject.left = el.offsetLeft;

 theobject.top = el.offsetTop;

 window.event.returnValue = false;

 window.event.cancelBubble = true;

}

function doUp() {

 if (theobject != null) {

  theobject = null;

 }

}

function doMove() {

 var el, xPos, yPos, str, xMin, yMin;

 xMin = 8; //The smallest width possible

 yMin = 8; //  height

 el = getReal(event.srcElement, "className", "resizeMe");

 if (el.className == "resizeMe") {

 str = getDirection(el);

 //Fix the cursor 

  if (str == "") str = "default";

  else str += "-resize";

  el.style.cursor = str;

 }

//Dragging starts here

 if(theobject != null) {

  if (dir.indexOf("e") != -1)

   theobject.el.style.width = Math.max(xMin, theobject.width + window.event.clientX - theobject.grabx) + "px";

  if (dir.indexOf("s") != -1)

   theobject.el.style.height = Math.max(yMin, theobject.height + window.event.clientY - theobject.graby) + "px";

  if (dir.indexOf("w") != -1) {

   theobject.el.style.left = Math.min(theobject.left + window.event.clientX - theobject.grabx, theobject.left + theobject.width - xMin) + "px";

   theobject.el.style.width = Math.max(xMin, theobject.width - window.event.clientX + theobject.grabx) + "px";

  }

  if (dir.indexOf("n") != -1) {

   theobject.el.style.top = Math.min(theobject.top + window.event.clientY - theobject.graby, theobject.top + theobject.height - yMin) + "px";

   theobject.el.style.height = Math.max(yMin, theobject.height - window.event.clientY + theobject.graby) + "px";

  }

  window.event.returnValue = false;

  window.event.cancelBubble = true;

 } 

}

function getReal(el, type, value) {

 temp = el;

 while ((temp != null) && (temp.tagName != "BODY")) {

  if (eval("temp." + type) == value) {

   el = temp;

   return el;

  }

  temp = temp.parentElement;

 }

 return el;

}

document.onmousedown = doDown;

document.onmouseup = doUp;

document.onmousemove = doMove;

</SCRIPT> </TD></TR></TBODY></TABLE>

</CENTER>

</BODY>

</HTML>


希望本文所述对大家JavaScript程序设计有所帮助。




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