筛选selected

 

<script type="text/javascript">
        var all = "";
        var indexid = "0";
        function chooseSelect()
        {
            s = document.getElementById("myselect");
            ops= s.options;
            if(all != document.getElementById("Text1").value)
            {
                indexid = "0";
            }
            all = document.getElementById("Text1").value;
            for(var i=0; i<s.length; i++)
            {
                if(ops[i].text.indexOf(all) > -1)
                {
                    if(parseInt(indexid) < parseInt(ops[i].value))
                    {
                        indexid = ops[i].value;
                        s.options[i].selected=true;
                        break;
                    }
                }
            } 
        }
    </script>