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让DropDownlist显示ToolTip(两部分) - joyous jeny - 博客园
joyous jeny · 2008-09-25 · via 博客园 - joyous jeny

首先:Items显示title代码:

 window.onload = showdropitem;
function showdropitem()
{
    var el = document.getElementsByTagName("select");
    for(i=0;i<el.length;i++)
    {
        for(j=0;j<el[i].options.length;j++)
        {
            el[i].options[j].title = el[i].options[j].text;
        }
    }
}

页面内所有的dropdownlist控件都可以实现tooltip(html里面为title)效果

其次:选定项显示Title的方法

Html:

         document.write('<div   id=tooltip   style="Z-Index:2000;   BORDER-RIGHT:   #666666   1px   solid;   PADDING-RIGHT:   1px;   BORDER-TOP:   #666666   1px   solid;   PADDING-LEFT:   1px;   VISIBILITY:   hidden;   PADDING-BOTTOM:   1px;   FONT:   12px   Arial CYR ;   BORDER-LEFT:   #666666   1px   solid;   COLOR:   #333333;   PADDING-TOP:   1px;   BORDER-BOTTOM:   #666666   1px   solid;   POSITION:   absolute;   BACKGROUND-COLOR:   #ffffcc;   layer-background-color:   #ffffcc"></div>');  
          var   posX   =   0;  
          var   posY   =   0;  

                      function   showToolTip(x)  
          {  
              var   lobjCurrentDropdown   =   window.event.srcElement;  
              posX   =   getX(lobjCurrentDropdown);  
              posY   =   getY(lobjCurrentDropdown);  
              if   (x==1)  //A   tooltip   must   be   shown  
              {
                 if   (lobjCurrentDropdown.selectedIndex   >=   0) 
                 {
                      document.all.tooltip.innerHTML   = lobjCurrentDropdown[lobjCurrentDropdown.selectedIndex].text;
                      document.all.tooltip.style.left  =   posX   +   2;  
                      document.all.tooltip.style.top   =   posY   +   30;  
                      document.all.tooltip.style.visibility   =   "visible";  
                 }
                 else 
                 {  
                      document.all.tooltip.innerHTML   =   "";  
                      document.all.tooltip.style.visibility   =   "hidden";  
                 }
              }  
              else
              {   //A   tootip   must   not   be   shown  
                 document.all.tooltip.style.visibility   =   "hidden";  
              }  
          }  

                                  function   getX(obj)
          {  
              return(   obj.offsetParent==null   ?   obj.offsetLeft   :   obj.offsetLeft+getX(obj.offsetParent)   );  
          }  
          function   getY(obj)  
          {  
             return(   obj.offsetParent==null   ?   obj.offsetTop   :   obj.offsetTop+getY(obj.offsetParent)   );  
          }

后台

            ddlCollection.Attributes.Add("onmouseover", "javascript:showToolTip(1);");
            ddlCollection.Attributes.Add("onmouseout", "javascript:showToolTip(0);");