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javascript realizes the method of clicking the button to pop up a window that can close the layer while the background of the web page becomes gray

  • 2020-06-12 08:33:20
  • OfStack

An example of javascript is presented in this paper. Click the button to pop up a layer window that can be closed while the background of the web page becomes grey. Share to everybody for everybody reference. The specific analysis is as follows:

When you click the button, a layer window pops up that can be closed, and the background of the page turns gray. On QQ, you often see QQ login, similar to this. The code snippet is based on JavaScript, depending on your situation, and sometimes with CSS. 


<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
<title> The pop-up 1 Multiple layers, the page grays out </title>
<script language="javascript">
function alertWin(title, msg, w, h){ 
 var titleheight = "23px"; //  Window title height  
 var bordercolor = "#336699"; //  The border color of the prompt window  
 var titlecolor = "#FFFFFF"; //  Window title color  
 var titlebgcolor = "#336699"; //  Window title background color 
 var bgcolor = "#FFFFFF"; //  The background color of the prompt 
 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 ' Song typeface ';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 ' Song typeface ';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+";'> x </span>";
 closeBtn.onclick = function(){ 
  document.body.removeChild(bgObj); 
  document.body.removeChild(msgObj); 
 } 
 var msgBox = table.insertRow(-1).insertCell(-1);
 msgBox.style.cssText = "font:10pt ' Song typeface ';";
 msgBox.colSpan = 2;
 msgBox.innerHTML = msg;
  //  To obtain Event Object for compatibility IE and FireFox
  function getEvent() {
   return window.event || arguments.callee.caller.arguments[0];
  }
} 
</script>
</head>
<body>
<input type="button" value=" Click here " 
onclick="alertWin(' Click to pop up a layer window that can be closed, and the page will become gray ',290,208);" />
</body>
</html>

I hope this article has been helpful for your javascript programming.

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