JavaScript method to realize clicking a button to pop up a closeable layer window and make the background of the web page gray

JavaScript method to realize clicking a button to pop up a closeable layer window and make the background of the web page gray_javascript skills

WBOY

Release： 2016-05-16 15:59:19

Original

1702 people have browsed it

The example in this article describes the JavaScript method of clicking a button to pop up a closeable layer window and the background of the web page turns gray. Share it with everyone for your reference. The specific analysis is as follows:

After clicking the button here, a closeable layer window pops up, and then the background of the web page turns gray. You can often see the QQ login effect on the QQ website, which is very similar to this. The code snippet is based on JavaScript. According to your In some cases, this function is sometimes accomplished using CSS.

<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
<title>弹出一个层，页面变灰</title>
<script language="javascript">
function alertWin(title, msg, w, h){ 
 var titleheight = "23px"; // 窗口标题高度 
 var bordercolor = "#336699"; // 提示窗口的边框颜色 
 var titlecolor = "#FFFFFF"; // 窗口标题颜色 
 var titlebgcolor = "#336699"; // 窗口标题背景色
 var bgcolor = "#FFFFFF"; // 提示内容的背景色
 var iWidth = document.documentElement.clientWidth; 
 var iHeight = document.documentElement.clientHeight; 
 var bgObj = document.createElement("div"); 
 bgObj.style.cssText = "position:absolute;left:0px;top:0px;width:"+iWidth+"px;height:"+Math.max(document.body.clientHeight, iHeight)+"px;filter:Alpha(Opacity=30);opacity:0.3;background-color:#000000;z-index:101;";
 document.body.appendChild(bgObj); 
 var msgObj=document.createElement("div");
 msgObj.style.cssText = "position:absolute;font:11px '宋体';top:"+(iHeight-h)/2+"px;left:"+(iWidth-w)/2+"px;width:"+w+"px;height:"+h+"px;text-align:center;border:1px solid "+bordercolor+";background-color:"+bgcolor+";padding:1px;line-height:22px;z-index:102;";
 document.body.appendChild(msgObj);
 var table = document.createElement("table");
 msgObj.appendChild(table);
 table.style.cssText = "margin:0px;border:0px;padding:0px;";
 table.cellSpacing = 0;
 var tr = table.insertRow(-1);
 var titleBar = tr.insertCell(-1);
 titleBar.style.cssText = "width:100%;height:"+titleheight+"px;text-align:left;padding:3px;margin:0px;font:bold 13px '宋体';color:"+titlecolor+";border:1px solid " + bordercolor + ";cursor:move;background-color:" + titlebgcolor;
 titleBar.style.paddingLeft = "10px";
 titleBar.innerHTML = title;
 var moveX = 0;
 var moveY = 0;
 var moveTop = 0;
 var moveLeft = 0;
 var moveable = false;
 var docMouseMoveEvent = document.onmousemove;
 var docMouseUpEvent = document.onmouseup;
 titleBar.onmousedown = function() {
  var evt = getEvent();
  moveable = true; 
  moveX = evt.clientX;
  moveY = evt.clientY;
  moveTop = parseInt(msgObj.style.top);
  moveLeft = parseInt(msgObj.style.left);  
  document.onmousemove = function() {
   if (moveable) {
    var evt = getEvent();
    var x = moveLeft + evt.clientX - moveX;
    var y = moveTop + evt.clientY - moveY;
    if ( x > 0 &&( x + w < iWidth) && y > 0 && (y + h < iHeight) ) {
     msgObj.style.left = x + "px";
     msgObj.style.top = y + "px";
    }
   } 
  };
  document.onmouseup = function () { 
   if (moveable) { 
    document.onmousemove = docMouseMoveEvent;
    document.onmouseup = docMouseUpEvent;
    moveable = false; 
    moveX = 0;
    moveY = 0;
    moveTop = 0;
    moveLeft = 0;
   } 
  };
 }
 var closeBtn = tr.insertCell(-1);
 closeBtn.style.cssText = "cursor:pointer; padding:2px;background-color:" + titlebgcolor;
 closeBtn.innerHTML = "<span style='font-size:15pt; color:"+titlecolor+";'>×</span>";
 closeBtn.onclick = function(){ 
  document.body.removeChild(bgObj); 
  document.body.removeChild(msgObj); 
 } 
 var msgBox = table.insertRow(-1).insertCell(-1);
 msgBox.style.cssText = "font:10pt '宋体';";
 msgBox.colSpan = 2;
 msgBox.innerHTML = msg;
  // 获得Event对象，用于兼容IE和FireFox
  function getEvent() {
   return window.event || arguments.callee.caller.arguments[0];
  }
} 
</script>
</head>
<body>
<input type="button" value="点这里" 
onclick="alertWin('点击弹出可关闭的层窗口，网页变灰',290,208);" />
</body>
</html>

Copy after login

I hope this article will be helpful to everyone’s JavaScript programming design.