基于jQuery JavaScript Library v1.3.2 的单选模拟
(本文件是跟据 zhangjingwei 的Jquery Select(单选) 模拟插件 V1.3.4 修改而来的)
a. 修改的主要原因是，原来的zhangjingwei的模拟在显示方式上的问题。在跟文字交替出现时会出现错位。现将模拟DIV的display修改为inline方式。更自然的嵌入到文本行中。
b.在加载文件后自动转化样式名为'commonselect' 的select。简化调用
c.对select的onchange()事件的响应。以及宽度获取的小调整
jquery.select.js
复制代码代码如下:
/* 
* jQuery.select.js 
*/ 
jQuery.fn.sSelect = function(){ 
    var selectId = $(this).attr('id'); 
    var selectZindex = $(this).css('z-index'); 
    var selectIndex = $('#'+selectId+' > select > option').index($('#'+selectId+' > select > option:selected')[0]); 
    $('#'+selectId).append('


'); 
    $('#'+selectId+' > div > h4').empty().append($('#'+selectId+' > select > option:selected').text()); 
    $('.dropselectbox').css("display", 'block'); 

    //取select的宽度 优先级 select样式中的宽度 - select自动的宽度 - 默认为60 
    var selectcssWidth = $('#'+selectId+'> select').css('width'); 
    selectcssWidth = typeof(selectcssWidth) =='undefined' ? 0 : parseInt(selectcssWidth.replace('px','')) +5 ; 
    var selectWidth = selectcssWidth ? selectcssWidth : ( $('#'+selectId+'> select').width() > 0 ? $('#'+selectId+'> select').width() + 5 : 60); 
    $('#'+selectId).css("margin-right",selectWidth);    //修改偏移量 
    $('#'+selectId+' > div > h4').css("width", selectWidth); //将原select的宽度赋值给生成的select（并不是h4的总宽度） 
    $('#'+selectId+' > div > ul').css("width",selectWidth); //将h4的总宽度赋值给Ul 
    $('#'+selectId+' > select').hide(); 
    $('#'+selectId+' > div').hover(function(){ 
        $('#'+selectId+' > div > h4').addClass("over"); 
        $('#'+selectId+' > div > span').addClass("over"); 
    },function(){ 
        $('#'+selectId+' > div > h4').removeClass("over"); 
        $('#'+selectId+' > div > span').removeClass("over"); 
    }); 
    $('#'+selectId) 
    .bind("focus",function(){ 
        __clearSelectMenu(); 
        $('#'+selectId+' > div > h4').addClass("over"); 
        $('#'+selectId+' > div > span').addClass("over"); 
    }) 
    .bind("click",function(e){ 
        //$('#value2').append('点击：'+selectIndex+'  
'); 
        if($('#'+selectId+' > div > ul').css("display") == 'block'){ 
            __clearSelectMenu(selectId); 
            return false; 
        }else{ 
            if ($.browser.opera){__clearSelectMenu();} 
            $('#'+selectId+' > div > h4').addClass("current"); 
            $('#'+selectId+' > div > span').addClass("over").addClass("current"); 
            $('#'+selectId+' > div > ul').show(); 
            var selectZindex = $(this).css('z-index'); 
            if ($.browser.msie || $.browser.opera){         
                $('.dropdown').removeClass('overclass');         
            } 
            $('#'+selectId).addClass('overclass'); 
            __setSelectValue(selectId); 
            var windowspace = ($(window).scrollTop() + document.documentElement.clientHeight) - $(this).offset().top; 
            var ulspace = $('#'+selectId+' > div > ul').outerHeight(true); 
            var windowspace2 = $(this).offset().top - $(window).scrollTop() - ulspace; 
            if (windowspace  0) { 
                $('#'+selectId+' > div > ul').css({top:-ulspace}); 
            }else{ 
                $('#'+selectId+' > div > ul').css({top:$('#'+selectId+' > div > h4').outerHeight(true)}); 
            } 
            selectIndex = $('#'+selectId+' > div > ul > li').index($('.selectedli')[0]); 
            $(window).scroll(function(){ 
                var windowspace = ($(window).scrollTop() + document.documentElement.clientHeight) - $('#'+selectId).offset().top; 
                var ulspace = $('#'+selectId+' > div > ul').outerHeight(true); 
                if (windowspace                     $('#'+selectId+' > div > ul').css({top:-ulspace}); 
                }else{ 
                    $('#'+selectId+' > div > ul').css({top:$('#'+selectId+' > div > h4').outerHeight(true)}); 
                } 
            }); 
            //响应鼠标点击选择 
            $('#'+selectId+' > div > ul > li').click(function(e){                                         
                    selectIndex = $('#'+selectId+' > div > ul > li').index(this); 
                    //$('#value2').append('鼠标点击：'+selectIndex+'  
'); 
                    $('#'+selectId+'> select')[0].selectedIndex = selectIndex; 
                    $('#'+selectId+' > div > h4').empty().append($('#'+selectId+' > select > option:selected').text()); 
                    __clearSelectMenu(selectId,selectZindex); 
                    e.stopPropagation(); 
                    e.cancelbubble = true; 
                    //SELECT onchange 事件 
                    $('#'+selectId+'> select').change(); 
            }) 
            .hover( 
                 function(){ 
                        $('#'+selectId+' > div > ul > li').removeClass("over"); 
                        $(this).addClass("over").addClass("selectedli"); 
                        selectIndex = $('#'+selectId+' > div > ul > li').index(this); 
                    }, 
                    function(){ 
                        $(this).removeClass("over"); 
                    } 
            ); 
            //End 
        }; 
        e.stopPropagation(); 
    }) 
    .bind("mousewheel",function(){ 
        //以后也许支持滚轮     
        /*$('#'+selectId+' > div > ul > li').hover( 
            function(){ 
             return false; 
            }, 
            function(){ 
                return false; 
            } 
        );*/ 
    }) 
    .bind("dblclick", function(){ 
        __clearSelectMenu(); 
        return false; 
    }) 
    .bind("keydown",function(e){ 
        //var hotkeys = e.keyCode; 
        $(this).bind('keydown',function(e){ 
            if (e.keyCode == 40 || e.keyCode == 38 || e.keyCode == 35 || e.keyCode == 36){ 
                return false; 
            } 
        }); 
        switch(e.keyCode){ //设置为true可给定case范围 
            case 9: 
                return true; 
                break; 
            case 13: 
                //enter 
                //$('#value2').append('按回车收到的值：'+selectIndex+'  
'); 
                __clearSelectMenu(); 
                break; 
            case 27: 
                //esc 
                __clearSelectMenu(); 
                break; 
            case 33: 
                $('#'+selectId+' > div > ul > li').removeClass("over"); 
                selectIndex = 0; 
                __keyDown(selectId,selectIndex); 
                break; 
            case 34: 
                $('#'+selectId+' > div > ul > li').removeClass("over"); 
                selectIndex = ($('#'+selectId+' > select > option').length - 1); 
                __keyDown(selectId,selectIndex); 
                break; 
            case 35: 
                $('#'+selectId+' > div > ul > li').removeClass("over"); 
                selectIndex = ($('#'+selectId+' > select > option').length - 1); 
                __keyDown(selectId,selectIndex); 
                break; 
            case 36: 
                $('#'+selectId+' > div > ul > li').removeClass("over"); 
                selectIndex = 0; 
                __keyDown(selectId,selectIndex); 
                break; 
            case 38: 
                //up 
                //$('#value2').append('原始值：'+selectIndex+'  
'); 
                $('#'+selectId+' > div > ul > li').removeClass("over"); 
                if (selectIndex == 0){ 
                    selectIndex = 0; 
                }else{ 
                    selectIndex--; 
                }; 
                //$('#value2').append('向上改变的aa值：'+selectIndex+'  '); 
                __keyDown(selectId,selectIndex); 
                break; 
            case 40: 
                //down 
                //$('#value2').append('传递过来的：'+selectIndex+'  '); 
                $('#'+selectId+' > div > ul > li').removeClass("over"); 
                if (selectIndex == ($('#'+selectId+' > select > option').length - 1)){ 
                    selectIndex = $('#'+selectId+' > select > option').length - 1; 
                }else{ 
                    selectIndex ++; 
                }; 
                //$('#value2').append('向下改变的aa值：'+selectIndex+'  '); 
                __keyDown(selectId,selectIndex); 
                break; 
            /*case ((hotkeys > 47 && hotkeys  64 && hotkeys  96 && hotkeys                 //首字幕查询预留接口 
                //character = String.fromCharCode(hotkeys).toLowerCase(); 
                return false; 
                break;*/ 
            default: 
                return false; 
                break; 
        }; 
    }) 
    .bind("blur",function(){ 
        __clearSelectMenu(selectId,selectZindex); 
        return false; 
    }); 
    //禁止选择 
    $('.dropselectbox').bind("selectstart",function(){ 
            return false; 
    }); 
}; 
function __clearSelectMenu(selectId,selectZindex){ 
    //$('#value2').append('移除焦点：'+selectIndex+'  
'); 
    $('.dropselectbox > ul').empty().hide(); 
    $('.dropselectbox > h4').removeClass("over").removeClass("current"); 
    $('.dropselectbox > span').removeClass("over"); 
    $('#'+selectId).removeClass('overclass'); 
} 
function __setSelectValue(sID){ 
    $('#'+sID+' > div > ul').empty(); 
    $.each($('#'+sID+' > select > option'), function(i){ 
        $('#'+sID+' > div > ul').append(""+$(this).text()+"
"); 
    }); 
    $('#'+sID+' > div > h4').empty().append($('#'+sID+' > select option:selected').text()); 
    $('#'+sID+' > div > ul > li').eq($('#'+sID+'> select')[0].selectedIndex).addClass("over").addClass("selectedli"); 
} 
function __keyDown(sID,selectIndex){ 
    $('#'+sID+'> select')[0].selectedIndex = selectIndex; 
    $('#'+sID+' > div > ul > li:eq('+selectIndex+')').toggleClass("over"); 
    $('#'+sID+' > div > h4').empty().append($('#'+sID+' > select option:selected').text()); 
    //SELECT onchange 事件 
    $('#'+sID+'> select').change(); 
} 
/* 自动调用 */ 
$(document).ready(function(){ 
    var s = new Array(); 
    var t = document.getElementsByTagName('select'); 
    var j = 0; 
    for(var i=0;i        if(t[i].className=='commonselect'){ 
            s[j] = t[i]; 
            j++; 
        } 
    } 
    if(j==0)return; 
    var k = m = null; 
    for(var i=0;i        k = s[i].parentNode; 
        m = createDiv(k, i); 
        //s[i].replaceNode(m); 
        k.replaceChild(m,s[i]) 
        m.appendChild(s[i]); 
        $('#selectbox'+ i).sSelect(); 
    }     
    function createDiv(p, i){ 
        var div = document.createElement('div'); 
        div.className = 'dropdown'; 
        div.id = 'selectbox' + i; 
        div.innerHTML = ' '; 
        p.appendChild(div); 
        return div;     
    } 
}) 