JavaScript implements scalable display area effect code-JS Tutorial-php.cn

JavaScript implements scalable display area effect code

PHPz

Release： 2018-09-28 16:43:41

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This article mainly introduces the javaScript implementation of the scalable display area effect code, which has certain reference value. Friends in need can refer to it, as follows:

Here is a demonstration of the scalable display area, using JS code implementation, press the mouse on the lower right corner of the area, and when the drag and drop arrow appears, pull down or up to achieve the zoom operation. When the area is small, the scroll bar is displayed, which is also a common effect. Here is the JavaScript code Share it with everyone.

A screenshot of the running effect is as follows:

The online demo address is as follows:

http://demo.jb51.net/ js/2015/js-ksf-box-style-demo/

The specific code is as follows:

<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
}
#testp {
 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>
 <p class=resizeMe id=testp>
 <p 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></p></p>
 <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>

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