js 增加的opation 处于选中

new Option(text,value,isSelected);for Example:
var opt = new Option("testtext","testvalue",true);
selectref.options[selectref.length] = opt;

解决方案 »

  1.   

    id est:<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
    <html xmlns="http://www.w3.org/1999/xhtml">
    <head>
    <meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
    <title>shawl.qiu template</title>
    <script type="text/javascript">
    //<![CDATA[
     onload = 
      function()
      {
       var EleSle = document.getElementById('hiYa');
       
       var iSelected = EleSle.length;
       EleSle.options[EleSle.length]=fNewOpt("selected", 'ok', true, true);
       
       
       var iUnselected = EleSle.length
       EleSle.options[EleSle.length]=fNewOpt("unselected", 'ok');
       
       alert(EleSle.options[iSelected].innerHTML+": "+EleSle.options[iSelected].selected)
       
       alert(EleSle.options[iUnselected].innerHTML+": "+EleSle.options[iUnselected].selected)
       
      }
      
      function fNewOpt(sText, sValue, bDefaultSelected, bSelected)
      {
       return new Option(sText, sValue, bDefaultSelected, bSelected);
      }
    //]]>
    </script>
    </head>
    <body>
    <select id='hiYa'>
     <option>get that</option>
    </select>
    </body>
    </html>