【下拉框可输入+自动提示+支持键盘事件兼容IE,FF】

 

$(document).ready( function () {
     var cus = 0;
     var classname = "" ;
     var arry = new Array();
     var $autocomplete = $( "<ul class='autocomplete'></ul>" ).hide().insertAfter( "#box4" );
     $( "#hoho" ).find( "option" ).each( function (i, n) {
         arry[i] = $( this ).text()
     });
     $( "#box4" ).keyup( function (event) {
         if ((event.keyCode != 38) && (event.keyCode != 40) && (event.keyCode != 13)) {
             $autocomplete.empty();
             var $SerTxt = $( "#box4" ).val().toLowerCase();
             if ($SerTxt != "" && $SerTxt != null ) {
                 for ( var k = 0; k < arry.length; k++) {
                     if (arry[k].toLowerCase().indexOf($SerTxt) >= 0) {
                         $( "<li title=" + arry[k] + " class=" + classname + "></li>" ).text(arry[k]).appendTo($autocomplete).mouseover( function () {
                             $( ".autocomplete li" ).removeClass( "hovers" );
                             $( this ).css({
                                 background: "#3368c4" ,
                                 color: "#fff"
                             })
                         }).mouseout( function () {
                             $( this ).css({
                                 background: "#fff" ,
                                 color: "#000"
                             })
                         }).click( function () {
                             $( "#box4" ).val($( this ).text());
                             $autocomplete.hide()
                         })
                     }
                 }
             }
             $autocomplete.show()
         }
         var listsize = $( ".autocomplete li" ).size();
         $( ".autocomplete li" ).eq(0).addClass( "hovers" );
         if (event.keyCode == 38) {
             if (cus < 1) {
                 cus = listsize - 1;
                 $( ".autocomplete li" ).removeClass();
                 $( ".autocomplete li" ).eq(cus).addClass( "hovers" );
                 var text = $( ".autocomplete li" ).eq(cus).text();
                 $( "#box4" ).val(text)
             } else {
                 cus--;
                 $( ".autocomplete li" ).removeClass();
                 $( ".autocomplete li" ).eq(cus).addClass( "hovers" );
                 var text = $( ".autocomplete li" ).eq(cus).text();
                 $( "#box4" ).val(text)
             }
         }
         if (event.keyCode == 40) {
             if (cus < (listsize - 1)) {
                 cus++;
                 $( ".autocomplete li" ).removeClass();
                 $( ".autocomplete li" ).eq(cus).addClass( "hovers" );
                 var text = $( ".autocomplete li" ).eq(cus).text();
                 $( "#box4" ).val(text)
             } else {
                 cus = 0;
                 $( ".autocomplete li" ).removeClass();
                 $( ".autocomplete li" ).eq(cus).addClass( "hovers" );
                 var text = $( ".autocomplete li" ).eq(cus).text();
                 $( "#box4" ).val(text)
             }
         }
         if (event.keyCode == 13) {
             $( ".autocomplete li" ).removeClass();
             $( "#HTML" ).html( "你选择的是<font color='red'>" + $( ".autocomplete li" ).eq(cus).text()+ "</font>" );
             $autocomplete.hide();
 
         }
     }).blur( function () {
         setTimeout( function () {
             $autocomplete.hide()
         },
         3000)
     })
});
function setValue(index) {
     var ddl = document.getElementById( "hoho" );
     var Value = ddl.options[index].text;
     document.getElementById( "box4" ).value = Value
     $( "#HTML" ).html( "你选择的是<font color='red'>" +Value+ "</font>" );
}
.hoho{ width : 197 ; height : 20px !important ; height : 17px ; margin-left : -180px !important ; margin-left : -179px }
.sp{ margin-left : 179px ; width : 18px ; overflow : hidden ; }
.bo 4 { width : 178px ; position : absolute ; left : 0px !important ; height : 20px !important ; top : 0.5px !important ; left : 1px ; top : 0px ; height : 20px }
.autocomplete{ list-style-type : none ; margin : 0px ; padding : 0px ; border : #008080 1px solid }
.autocomplete li{ font-size : 12px ; font-family : "Lucida Console" , Monaco, monospace ; font-weight : bold ; cursor : pointer ; height : 20px ; line-height : 20px }
.hovers{ background-color : #3368c4 ; color :fff}
<table width="440" border="0" align="center">
  <tr>
    <td><div style="position:relative;">   
      <span  class="sp">   
            <select id="hoho" name="hoho"  class="hoho" onChange="setValue(this.selectedIndex)" >
            	  <option> ===请选择===</option>
                  <option value='0' >Java EE</option>
                  <option value='1' >Java SE</option>
                  <option value='2' >Java ME</option>
                  <option value='3' >Net</option>
                  <option value='4' >PHP</option>
                  <option value='5' >Ajax</option>
                  <option value='6' >JQuer</option>
             </select>
             
     </span>
     <input name="box4" id="box4" value="===请选择==="  class="bo4" >   
</div>
	</td>
    <td id="HTML" width="350">输入A试试</td>
  </tr>
</table>

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转载自zk-yangyan.iteye.com/blog/2126504