javaScript实现可缩放的显示区

2024-09-05 12:18:40

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可缩放的显示区，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。

<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>

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