用JavaScript实现的下拉日期选择控件

<scrīpt language="javascrīpt">
<!--
/**
 * 返回日期
 * @param d the delimiter
 * @param p the pattern of your date
 */
String.prototype.toDate = function(x, p) {
    if(x == null) x = "-";
    if(p == null) p = "ymd";
    var a = this.split(x);
    var y = parseInt(a[p.indexOf("y")]);
    //remember to change this next century ;)
    if(y.toString().length <= 2) y += 2000;
    if(isNaN(y)) y = new Date().getFullYear();
    var m = parseInt(a[p.indexOf("m")]) - 1;
    var d = parseInt(a[p.indexOf("d")]);
    if(isNaN(d)) d = 1;
    return new Date(y, m, d);
};

/**
 * 格式化日期
 * @param   d the delimiter
 * @param   p the pattern of your date
 * @author  meizz
 */
Date.prototype.format = function(style) {
    var o = {
        "M+" : this.getMonth() + 1, //month
        "d+" : this.getDate(),      //day
        "h+" : this.getHours(),     //hour
        "m+" : this.getMinutes(),   //minute
        "s+" : this.getSeconds(),   //second
        "w+" : "天一二三四五六".charAt(this.getDay()),   //week
        "q+" : Math.floor((this.getMonth() + 3) / 3),  //quarter
        "S"  : this.getMilliseconds() //millisecond
    }
    if(/(y+)/.test(style)) {
        style. = style.replace(RegExp.$1,(this.getFullYear() + "").substr(4 - RegExp.$1.length));
    }
    for(var k in o){
        if(new RegExp("("+ k +")").test(style)){
            style. = style.replace(RegExp.$1,RegExp.$1.length == 1 ? o[k] : ("00" + o[k]).substr(("" + o[k]).length));
        }
    }
    return style;
};

/**
 * 日历类
 * @param   beginYear 1990
 * @param   endYear   2010
 * @param   lang      0(中文)|1(英语) 可自由扩充
 * @param   dateFormatStyle  "yyyy-MM-dd";
 * @version 2006-04-01
 * @author  KimSoft (jinqinghua [at] gmail.com)
 * @update
 */
function Calendar(beginYear, endYear, lang, dateFormatStyle) {
    this.beginYear = 1990;
    this.endYear = 2100;
    this.lang = 0;            //0(中文) | 1(英文)
    this.fontSize='12px';        //字的大小
    this.dateFormatStyle. = "yyyy-MM-dd";
    if (beginYear != null && endYear != null){
        this.beginYear = beginYear;
        this.endYear = endYear;
    }
    if (lang != null){
        this.lang = lang;
    }
    if (dateFormatStyle. != null){
        this.dateFormatStyle. = dateFormatStyle;
    }
    this.dateControl = null;
    this.panel = this.getElementById("calendarPanel");
    this.form  = null;
    this.date = new Date();
    this.year = this.date.getFullYear();
    this.month = this.date.getMonth();
    
    this.colors = {
        "cur_word"      : "#FFFFFF",  //当日日期文字颜色
        "cur_bg"        : "#00FF00",  //当日日期单元格背影色
        "sun_word"      : "#FF0000",  //星期天文字颜色
        "sat_word"      : "#0000FF",  //星期六文字颜色
        "td_word_light" : "#333333",  //单元格文字颜色
        "td_word_dark"  : "#CCCCCC",  //单元格文字暗色
        "td_bg_out"     : "#EFEFEF",  //单元格背影色
        "td_bg_over"    : "#FFCC00",  //单元格背影色
        "tr_word"       : "#FFFFFF",  //日历头文字颜色
        "tr_bg"         : "#666666",  //日历头背影色
        "input_border"  : "#CCCCCC",  //input控件的边框颜色
        "input_bg"      : "#EFEFEF"   //input控件的背影色
    }

    this.draw();
    this.bindYear();
    this.bindMonth();
    this.changeSelect();
    this.bindData();
}

/**
 * 日历类属性（语言包，可自由扩展）
 */
Calendar.language = {
    "year"   : [[""], [""]],
    "months" : [["一月","二月","三月","四月","五月","六月","七月","八月","九月","十月","十一月","十二月"],["JAN", "FEB","MAR","APR","MAY","JUN","JUL","AUG","SEP","OCT","NOV","DEC"]],
    "weeks"  : [["日","一","二","三","四","五","六"],["SUN","MON","TUR","WED","THU","FRI", "SAT"]],
    "clear"  : [["清空"], ["CLS"]],
    "today"  : [["今天"], ["TODAY"]],
    "close"  : [["关闭"], ["CLOSE"]]
}

Calendar.prototype.draw = function() {
    calendar = this;

    var mvAry = [];
    mvAry[mvAry.length]  = '  <form. name="calendarForm" style="margin: 0px;">';
    mvAry[mvAry.length]  = '    <table width="100%" border="0" cellpadding="0" cellspacing="1" >';
    mvAry[mvAry.length]  = '      <tr>';
    mvAry[mvAry.length]  = '        <th align="left" width="1%"><input style="border: 1px solid ' + calendar.colors["input_border"] + ';background-color:' + calendar.colors["input_bg"] + ';width:16px;height:20px;" name="prevMonth" type="button" id="prevMonth" value="&lt;" /></th>';
    mvAry[mvAry.length]  = '        <th align="center" width="98%" nowrap="nowrap"><select name="calendarYear" id="calendarYear" style="font-size:12px;"></select><select name="calendarMonth" id="calendarMonth" style="font-size:12px;"></select></th>';
    mvAry[mvAry.length]  = '        <th align="right" width="1%"><input style="border: 1px solid ' + calendar.colors["input_border"] + ';background-color:' + calendar.colors["input_bg"] + ';width:16px;height:20px;" name="nextMonth" type="button" id="nextMonth" value="&gt;" /></th>';
    mvAry[mvAry.length]  = '      </tr>';
    mvAry[mvAry.length]  = '    </table>';
    mvAry[mvAry.length]  = '    <table id="calendarTable" width="100%" style="border:0px solid #CCCCCC;background-color:#FFFFFF;font-size:'+ calendar.fontSize +';" border="0" cellpadding="3" cellspacing="1">';
    mvAry[mvAry.length]  = '      <tr>';
    for(var i = 0; i < 7; i++) {
        mvAry[mvAry.length]  = '      <th style="font-weight:normal;background-color:' + calendar.colors["tr_bg"] + ';color:' + calendar.colors["tr_word"] + ';">' + Calendar.language["weeks"][this.lang][i] + '</th>';
    }
    mvAry[mvAry.length]  = '      </tr>';
    for(var i = 0; i < 6;i++){
        mvAry[mvAry.length]  = '    <tr align="center">';
        for(var j = 0; j < 7; j++) {
            if (j == 0){
                mvAry[mvAry.length]  = '  <td style="cursor:default;color:' + calendar.colors["sun_word"] + ';"></td>';
            } else if(j == 6) {
                mvAry[mvAry.length]  = '  <td style="cursor:default;color:' + calendar.colors["sat_word"] + ';"></td>';
            } else {
                mvAry[mvAry.length]  = '  <td style="cursor:default;"></td>';
            }
        }
        mvAry[mvAry.length]  = '    </tr>';
    }
    mvAry[mvAry.length]  = '      <tr style="background-color:' + calendar.colors["input_bg"] + ';">';
    mvAry[mvAry.length]  = '        <th colspan="2"><input name="calendarClear" type="button" id="calendarClear" value="' + Calendar.language["clear"][this.lang] + '" style="border: 1px solid ' + calendar.colors["input_border"] + ';background-color:' + calendar.colors["input_bg"] + ';width:100%;height:20px;font-size:12px;"/></th>';
    mvAry[mvAry.length]  = '        <th colspan="3"><input name="calendarToday" type="button" id="calendarToday" value="' + Calendar.language["today"][this.lang] + '" style="border: 1px solid ' + calendar.colors["input_border"] + ';background-color:' + calendar.colors["input_bg"] + ';width:100%;height:20px;font-size:12px;"/></th>';
    mvAry[mvAry.length]  = '        <th colspan="2"><input name="calendarClose" type="button" id="calendarClose" value="' + Calendar.language["close"][this.lang] + '" style="border: 1px solid ' + calendar.colors["input_border"] + ';background-color:' + calendar.colors["input_bg"] + ';width:100%;height:20px;font-size:12px;"/></th>';
    mvAry[mvAry.length]  = '      </tr>';
    mvAry[mvAry.length]  = '    </table>';
    mvAry[mvAry.length]  = '  </form>';
    this.panel.innerHTML = mvAry.join("");
    this.form. = document.forms["calendarForm"];
   
    this.form.prevMonth.onclick = function () {calendar.goPrevMonth(this);}
    this.form.nextMonth.onclick = function () {calendar.goNextMonth(this);}
    this.form.calendarClear.onclick = function () {calendar.dateControl.value = "";calendar.hide();}
    this.form.calendarClose.onclick = function () {calendar.hide();}
    this.form.calendarYear.onchange = function () {calendar.update(this);}
    this.form.calendarMonth.onchange = function () {calendar.update(this);}
    this.form.calendarToday.onclick = function () {
        var today = new Date();
        calendar.date = today;
        calendar.year = today.getFullYear();
        calendar.month = today.getMonth();
        calendar.changeSelect();
        calendar.bindData();
        calendar.dateControl.value = today.format(calendar.dateFormatStyle);
        calendar.hide();
    }
}

//年份下拉框绑定数据
Calendar.prototype.bindYear = function() {
    var cy = this.form.calendarYear;
    cy.length = 0;
    for (var i = this.beginYear; i <= this.endYear; i++){
        cy.options[cy.length] = new Option(i + Calendar.language["year"][this.lang], i);
    }
}

//月份下拉框绑定数据
Calendar.prototype.bindMonth = function() {
    var cm = this.form.calendarMonth;
    cm.length = 0;
    for (var i = 0; i < 12; i++){
        cm.options[cm.length] = new Option(Calendar.language["months"][this.lang][i], i);
    }
}

//向前一月
Calendar.prototype.goPrevMonth = function(e){
    if (this.year == this.beginYear && this.month == 0){return;}
    this.month--;
    if (this.month == -1) {
        this.year--;
        this.month = 11;
    }
    this.date = new Date(this.year, this.month, 1);
    this.changeSelect();
    this.bindData();
}

//向后一月
Calendar.prototype.goNextMonth = function(e){
    if (this.year == this.endYear && this.month == 11){return;}
    this.month++;
    if (this.month == 12) {
        this.year++;
        this.month = 0;
    }
    this.date = new Date(this.year, this.month, 1);
    this.changeSelect();
    this.bindData();
}

//改变SELECT选中状态
Calendar.prototype.changeSelect = function() {
    var cy = this.form.calendarYear;
    var cm = this.form.calendarMonth;
    for (var i= 0; i < cy.length; i++){
        if (cy.options[i].value == this.date.getFullYear()){
            cy[i].selected = true;
            break;
        }
    }
    for (var i= 0; i < cm.length; i++){
        if (cm.options[i].value == this.date.getMonth()){
            cm[i].selected = true;
            break;
        }
    }
}

//更新年、月
Calendar.prototype.update = function (e){
    this.year  = e.form.calendarYear.options[e.form.calendarYear.selectedIndex].value;
    this.month = e.form.calendarMonth.options[e.form.calendarMonth.selectedIndex].value;
    this.date = new Date(this.year, this.month, 1);
    this.changeSelect();
    this.bindData();
}

//绑定数据到月视图
Calendar.prototype.bindData = function () {
    var calendar = this;
    var dateArray = this.getMonthViewArray(this.date.getYear(), this.date.getMonth());
    var tds = this.getElementById("calendarTable").getElementsByTagName("td");
    for(var i = 0; i < tds.length; i++) {
       //tds[i].style.color = calendar.colors["td_word_light"];
        tds[i].style.backgroundColor = calendar.colors["td_bg_out"];
        tds[i].onclick = function () {return;}
        tds[i].onmouseover = function () {return;}
        tds[i].onmouseout = function () {return;}
        if (i > dateArray.length - 1) break;
        tds[i].innerHTML = dateArray[i];
        if (dateArray[i] != "&nbsp;"){
            tds[i].onclick = function () {
                if (calendar.dateControl != null){
                    calendar.dateControl.value = new Date(calendar.date.getFullYear(),calendar.date.getMonth(),this.innerHTML).format(calendar.dateFormatStyle);
                }
                calendar.hide();
            }
            tds[i].onmouseover = function () {
                this.style.backgroundColor = calendar.colors["td_bg_over"];
            }
            tds[i].onmouseout = function () {
                this.style.backgroundColor = calendar.colors["td_bg_out"];
            }
            if (new Date().format(calendar.dateFormatStyle) == new Date(calendar.date.getFullYear(),calendar.date.getMonth(),dateArray[i]).format(calendar.dateFormatStyle)) {
               //tds[i].style.color = calendar.colors["cur_word"];
                tds[i].style.backgroundColor = calendar.colors["cur_bg"];
                tds[i].onmouseover = function () {
                    this.style.backgroundColor = calendar.colors["td_bg_over"];
                }
                tds[i].onmouseout = function () {
                    this.style.backgroundColor = calendar.colors["cur_bg"];
                }
            }//end if
        }   
    }
}

//根据年、月得到月视图数据(数组形式)
Calendar.prototype.getMonthViewArray = function (y, m) {
    var mvArray = [];
    var dayOfFirstDay = new Date(y, m, 1).getDay();
    var daysOfMonth = new Date(y, m + 1, 0).getDate();
    for (var i = 0; i < 42; i++) {
        mvArray[i] = "&nbsp;";
    }
    for (var i = 0; i < daysOfMonth; i++){
        mvArray[i + dayOfFirstDay] = i + 1;
    }
    return mvArray;
}

//扩展 document.getElementById(id) 多浏览器兼容性 from meizz tree source
Calendar.prototype.getElementById = function(id){
    if (typeof(id) != "string" || id == "") return null;
    if (document.getElementById) return document.getElementById(id);
    if (document.all) return document.all(id);
    try {return eval(id);} catch(e){ return null;}
}

//扩展 object.getElementsByTagName(tagName)
Calendar.prototype.getElementsByTagName = function(object, tagName){
    if (document.getElementsByTagName) return document.getElementsByTagName(tagName);
    if (document.all) return document.all.tags(tagName);
}

//取得HTML控件绝对位置
Calendar.prototype.getAbsPoint = function (e){
    var x = e.offsetLeft;
    var y = e.offsetTop;
    while(e = e.offsetParent){
        x += e.offsetLeft;
        y += e.offsetTop;
    }
    return {"x": x, "y": y};
}

//显示日历
Calendar.prototype.show = function (dateControl, popControl) {
    if (dateControl == null){
        throw new Error("arguments[0] is necessary");
    }
    this.dateControl = dateControl;
    if (dateControl.value.length > 0){
        this.date = new Date(dateControl.value.toDate());
        this.year = this.date.getFullYear();
        this.month = this.date.getMonth();
        this.changeSelect();
        this.bindData();
    }
    if (popControl == null){
        popControl = dateControl;
    }
    var xy = this.getAbsPoint(popControl);
    this.panel.style.left = xy.x + "px";
    this.panel.style.top = (xy.y + dateControl.offsetHeight) + "px";
    this.setDisplayStyle("select", "hidden");
    this.panel.style.visibility = "visible";
}

//隐藏日历
Calendar.prototype.hide = function() {
    this.setDisplayStyle("select", "visible");
    this.panel.style.visibility = "hidden";
}

//设置控件显示或隐藏
Calendar.prototype.setDisplayStyle. = function(tagName, style) {
    var tags = this.getElementsByTagName(null, tagName)
    for(var i = 0; i < tags.length; i++) {
        if (tagName.toLowerCase() == "select" && (tags[i].name == "calendarYear" || tags[i].name == "calendarMonth")){
            continue;
        }
        tags[i].style.visibility = style;
    }
}

document.write('<div id="calendarPanel" style="position: absolute;visibility: hidden;z-index: 9999;background-color: #FFFFFF;border: 1px solid #CCCCCC;width:175px;font-size:12px;"></div>');
var calendar = new Calendar();
//调用calendar.show(dateControl, popControl);
//-->
</scrīpt>
<html>
<head>
<meta. http-equiv="Content-Type" content="text/html; charset=gb2312" />
<title>Web Calender Control Powered By KimSoft</title>

</head>
<body>
<form. id="form1" name="form1">
<p>
  Date:<input name="date" type="text" ōnClick="new Calendar('1970', '2010', 1, null).show(this);" readonly="readonly"/>
</p>
<p>
  <label>
  <select name="select">
    <option>select item</option>
  </select>
  </label>
  </p>
<p>
  <select name="select2">
    <option>select item</option>
  </select>
  <label></label>
</p>
<p>
  日期:<input name="date" type="text" ōnClick="new Calendar(null, null, 0, null).show(this);"/>
</p>
<p>
  <select name="select3">
    <option>select item</option>
  </select>
</p>
<p>
  <select name="select4">
    <option>select item</option>
  </select>
</p>
</form>
</body>
</html>

    //get id object   
    var $=function(node){    return document.getElementById(node);}   
    //get name object Array   
    var $$=function(node){    return document.getElementsByName(node);}   
    //get tag object Array   
    var $$$=function(node){    return document.getElementsByTagName(node);}