jquery实现键盘上下键、return键选折li

注释：code来源javaeye

使用前要引入jquery库和jquery.hotkeys.js ui

HTML CODE

<div class="searchform">
<form action="" method="post" onsubmit="return false;">
	<input type="text" name="top_search" class="text global_search" /> 
	<input type="button" value="" class="subform" /><!--<input type="button" value="" class="subform2" />--></form>
	<ul id="search_list">
		<li><a href="#" title="Private Equity Firms">Private Equity Firms</a></li>
	    <li><a href="#" title="Porfolio Companies">Porfolio Companies</a></li>
		<li><a href="#" title="Professionals">Professionals</a></li>
		<li><a href="#" title="Lenders">Lenders</a></li>

	</ul>
	<input type="hidden" name="prevTrIndex" id="prevTrIndex" value="-1" />
</div>

js code

<script type="text/javascript">
//<![CDATA[
/**
 * @about search part js packaging for pe website 3.28
 * @Copyright 2011, WANGXIANG
 * @MAILTO: [e-mail]
 */
(function ($) {
  $.fn.gobalSearch = function (options) {
    var defaults = {
      contanier: '',
      //drop menu contentsearch_list
      prevTrIndex: '',
      //mark prevTrIndex
      items: ['Private Equity Firms', 'Portfolio Companies', 'Professionals', 'Lenders'] //['Private Equity Firms','Portfolio Companies','Professionals','Lenders']
    };
    var options = $.extend(defaults, options);
    this.each(function () {
      var globalSearch = $(this);
      var searchbtn = globalSearch.next();
      var nextele = globalSearch.parent().next();
      var drop_li = nextele.children();
      var prevEle = $("#" + options.prevTrIndex);
      //js方法判断当前搜索框触发return按键
      /*globalSearch.keydown(function(event){
        var evt=event ? event : (window.event ? window.event:null);//兼容IE和FF
        if (evt.keyCode==13){ 
          nextele.show();
          globalSearch.blur();
          mainDrop();
        }
      });*/
      //jquery借助jquery.hotkey.js插件获取键盘return按键的事件
      globalSearch.bind('keydown', 'return', function (evt) {
        nextele.show();
        globalSearch.blur();
        mainDrop();
      });
      drop_li.bind('click', function () {
        var $this = $(this);
        var selectVal = $this.text();
        var searchVal = globalSearch.val();
        var relVal = $this.children('a').attr('rel');
        switch (selectVal) {
        case options.items[0]:
          window.location.href = relVal + searchVal;
          break;
        case options.items[1]:
          window.location.href = relVal + searchVal;
          break;
        case options.items[2]:
          window.location.href = relVal + searchVal;
          break;
        case options.items[3]:
          window.location.href = relVal + searchVal;
          break;
        default:
          return false;
        };
        nextele.hide();
        return false;
      });
      $(document).bind('keydown', 'up', function (evt) {
        var prevTrIndex = parseInt(prevEle.val());
        if (prevTrIndex == -1 || prevTrIndex == 0) {
          clickTr(trSize - 1);
        } else if (prevTrIndex > 0) {
          clickTr(prevTrIndex - 1);
        };
        return false;
      }).bind('keydown', 'down', function (evt) {
        var prevTrIndex = parseInt(prevEle.val());
        if (prevTrIndex == -1 || prevTrIndex == (trSize - 1)) {
          clickTr(0);
        } else if (prevTrIndex < (trSize - 1)) {
          clickTr(prevTrIndex + 1);
        };
        return false;
      }).bind('keydown', 'return', function (evt) {
        var prevTrIndex = parseInt(prevEle.val());
        var searchVal = globalSearch.val();
        var curli = $("#li_" + prevTrIndex);
        var selectVal = curli.text();
        var relVal = curli.children('a').attr('rel');
        switch (selectVal) {
        case options.items[0]:
          window.location.href = relVal + searchVal;
          break;
        case options.items[1]:
          window.location.href = relVal + searchVal;
          break;
        case options.items[2]:
          window.location.href = relVal + searchVal;
          break;
        case options.items[3]:
          window.location.href = relVal + searchVal;
          break;
        default:
          return false;
        };
        nextele.hide();
        return false;
      }).bind('click', function () {
        nextele.hide();
      });
      searchbtn.click(function () {
        if (!(nextele.css('display') == 'block')) {
          nextele.show();
          $(this).blur();
          mainDrop();
          return false;
        } else {
          nextele.hide();
          return false;
        };
      }).bind('keydown', 'return', function () {
        nextele.show();
        $(this).blur();
        mainDrop();
        return false;
      });
      //为当前选中的li选中样式


      function clickTr(currTrIndex) {
        var prevTrIndex = prevEle.val();
        if (currTrIndex > -1) {
          $("#li_" + currTrIndex).addClass("current");
        }
        $("#li_" + prevTrIndex).removeClass("current");
        prevEle.val(currTrIndex);
        $("#nuname").val(currTrIndex);
      };
      //下拉菜单添加事件集合方法

      function mainDrop() {
        drop_li.eq(0).focus();
        drop_li.removeClass('current');
        prevEle.val("-1"); //默认-1
        trSize = $("#" + options.contanier).find('li').size(); //li的数量
        drop_li.mouseover(function () { //鼠标滑过
          $(this).addClass("current");
        }).mouseout(function () { //鼠标滑出
          $(this).removeClass("current");
        }).each(function (i) { //初始化 id 和 index 属性
          $(this).attr("id", "li_" + i).attr("index", i);
        }).click(function () { //鼠标单击
          clickTr($(this).attr("index"));
        });
        clickTr(0);
        return false;
      };
    });
  };
})(jQuery);
//]]-->
</script>