javaScript实现可缩放的显示区效果代码

2019-11-20 11:24:13

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来源：转载

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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.VeVB.COm/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 startfunction 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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