通过自建iframe遮罩层解决flash位于window窗口之上的问题

       效果对于固定不动窗口或菜单则更有效，并不太适用于可移动的窗口，遮罩层与窗口位置很难一致。若是可移动的窗口建议用前面一篇文章所介绍的shim属性Ext自身提供的方法。

       同样下面的方法只对IE有效，firefox下依然无效。

Ext.onReady(function() {
       ......
      //创建垫片效果iframe遮罩层
  function createShim(coordinate) { 
       closeShim();
          var shimmer = document.createElement('iframe');   
          shimmer.id='shimmer';   
          shimmer.style.position='absolute';   
          shimmer.style.top=coordinate.top;   
          shimmer.style.left=coordinate.left;   
          shimmer.style.width=coordinate.width;   
          shimmer.style.height=coordinate.height;   
          shimmer.style.zIndex='999';   
          shimmer.setAttribute('frameborder','0');   
         // shimmer.setAttribute('src','javascript:false;');  
          document.body.appendChild(shimmer);   
  } 
       //移除iframe遮罩层   
      function closeShim(){
        var shimmer = document.getElementById('shimmer')   
         if(shimmer){
         document.body.removeChild(shimmer);
         }
      }
        // 查询窗口对象变量
 var searchWin;
 // 查询按钮
 function doSearch_pic_panel() {
                 searchWin = Ext.getCmp('search-window');  //避免出现显示两个窗口的问题            if (!searchWin) {
   searchWin = new Ext.Window({
    contentEL:'search-window',
    title : '请输入查询条件',
    layout : 'fit',
    width : 400,
    height : 300,
    closeAction : 'hide',
    plain : true,
    floating:true,
    shim:true,
    items : searchFormPanel_pic_panel,
    buttons : [{
     text : '查询',
     handler : function() {
              
       searchWin.hide();
     }
    }, {
     text : '关闭',
     handler : function() {
      searchWin.hide();
     }
    }]
   });
             searchWin.on("show",function(window){
    var winEl = window;
    var position =new Array();
    position = winEl.getPosition(true);
     createShim({   
                 top:position[1],   
                 left:position[0],   
                 width:winEl.getFrameWidth()+winEl.getInnerWidth(),   
                 height:winEl.getFrameHeight()+winEl.getInnerHeight()  
              });  
   });
      
            searchWin.on("hide",function(window){
            closeShim();
            });
            searchWin.on("beforemove",function(component,x,y){
             closeShim();
            });
            searchWin.on("move",function(component,x,y){
            closeShim();
             var winEl = Ext.getCmp('search-window');
    var position =new Array();
    position = winEl.getPosition(true);
             createShim({   
                 top:y,   
                 left:x, 
                 width:winEl.getFrameWidth()+winEl.getInnerWidth(),   
                 height:winEl.getFrameHeight()+winEl.getInnerHeight()  
            }); 
            });
  }
  searchWin.show();
 }
  ......
});

其实贴出来主要是学习这一种思想。网上也有关于该问题的讨论：

Why does moving the IFRAME shim slow things down?

              链接地址：https://www.extjs.com/forum/showthread.php?1384-Why-does-moving-the-IFRAME-shim-slow-things-down

       Iframe Shim解决applet挡住ExtJS工具栏菜单问题

               链接地址：http://agile-boy.javaeye.com/blog/140935

[OPEN-884] Shim size problem on Ext.Window with shadow

                链接地址：http://www.extjs.com/forum/showthread.php?97413-OPEN-884-Shim-size-problem-on-Ext.Window-with-shadow&p=459829#post459829