
// js calendar by jaewon
// last_modified : 2009/01/15
// Usage : < script type="text/javascript" src="calendar.js">< /script >
//         < input type="text" id="start_date" name="start_date" value="20081027|null" >
//         < input type="button" name="달력" onclick="calendar(event, 'start_date')" >
var calendar_div;
var calendar_obj;
var calendar_tt;

// 숨겨야 되는 select element 저장변수(Array)
var hidden_select;
// element의 x, y, width, height를 가져옴. (select외에 object를 인수로 사용해도 됨 ex:div)

function get_pos(selectObj)
{
    var pos = new Array();
    var pos_x = 0, pos_y = 0;
    // while에서 offsetParent를 찾아가는 방식이라
    // 다른 지정자에 인수로 넘어온 object를 넘겨줌.
    obj = selectObj;
    // 좌표계산
    while(obj.offsetParent)
    {
        pos_y += parseInt(obj.offsetTop);
        pos_x += parseInt(obj.offsetLeft);
        obj = obj.offsetParent;
    }
    pos_x += parseInt(obj.offsetLeft);
    pos_y += parseInt(obj.offsetTop);

    // 좌표저장
    pos.x = pos_x;
    pos.y = pos_y;
    pos.x2 = pos_x + selectObj.offsetWidth;
    pos.y2 = pos_y + selectObj.offsetHeight;

    return pos;
}

function hide_select(x, y, x2, y2)
{
    var selects = document.getElementsByTagName('select');
    var hidden_count = 0;

    x = parseInt(x);
    y = parseInt(y);
    x2 = parseInt(x2);
    y2 = parseInt(y2);

    var x_cross = false;
    var y_cross = false;

    hidden_select = new Array();

    //alert(x + ':' + y + ':' + x2 + ':' + y2);
    for(var i=0; i<selects.length; i++)
    {
        selects[i].pos = new Array();
        selects[i].pos = get_pos(selects[i]);

        // Div 영역에 포함 되어 있다면
        if((x <= selects[i].pos.x && x2 >= selects[i].pos.x) || (x <= selects[i].pos.x2 && x2 >= selects[i].pos.x2))
            x_cross = true;
        else
            x_cross = false;
        
        if((y <= selects[i].pos.y && y2 >= selects[i].pos.y) || (y <= selects[i].pos.y2 && y2 >= selects[i].pos.y2))
            y_cross = true;
        else
            y_cross = false;
        
        if(x_cross == true && y_cross == true)
        {
            selects[i].style.visibility = "hidden";
            hidden_select[hidden_count++] = i;
        }
    }
}

function show_select()
{
    var selects = document.getElementsByTagName('select');
    for(var i=0; i<hidden_select.length; i++)
    {
        selects[hidden_select[i]].style.visibility = "visible";
    }
    hidden_select = null;
}

function calendar_set(e)
{
    if(!e) var e = window.event;
    var click_obj = e.target || e.srcElement;
    
    var pos_x = 0;
    var pos_y = 0;
    var obj = click_obj;
    
    while(obj.offsetParent)
    {
        pos_y += parseInt(obj.offsetTop);
        pos_x += parseInt(obj.offsetLeft);
        
        obj = obj.offsetParent;
    }
    pos_x += parseInt(obj.offsetLeft);
    pos_y += parseInt(obj.offsetTop);
    
    pos_y += click_obj.offsetHeight;
    
    calendar_div = document.getElementById('calendar_div');
    
    if(!calendar_div)
    {
        calendar_div = document.createElement("DIV");
        document.body.appendChild(calendar_div);
    }
    calendar_div.id = "calendar_div";
    calendar_div.style.cssText = "width: 160px; padding: 5px; background-color:#fff; border: 3px solid #f10;";
    calendar_div.style.position = "absolute";
    calendar_div.style.top = pos_y + 'px';
    calendar_div.style.left = pos_x + 'px';
    
    calendar_div.style.visibility = "visible";
    calendar_div.onmouseover = function(e) {
        if(calendar_tt)
            window.clearTimeout(calendar_tt);
    }
    
    calendar_div.onmouseout = function() {
        if(calendar_tt)
            window.clearTimeout(calendar_tt);
        calendar_tt = window.setTimeout("calendar_hide()", 1000);
    }
    
    calendar_div.focus();
    
//    calendar_div.ondblclick = calendar_close;
}

function calendar_close(e)
{
    if(!e) var e = window.event;
    document.getElementById('calendar_div').style.visibility = "hidden";
    
    if(hidden_select)
        show_select();
    
    return false;
}

function calendar_draw(set_date)
{
    var days_arr = new Array(31,28,31,30,31,30,31,31,30,31,30,31);
    
    var html = "<table cellpadding=\"0\" cellspacing=\"0\" class=\"CalendarLayout\">";
    var calendar_date, calendar_t;
    
    if(set_date && (set_date.length == 6 || set_date.length == 8))
    {
        calendar_date = set_date;
        var y = calendar_date.substring(0, 4);
        var m = calendar_date.substring(4, 6);
        var s_t = new Date(y, m-1, 1);
        if(s_t.getMonth()+1 != Number(m))
            calendar_t = null;
        else
            calendar_t = new Date(y, m-1, 1);
    }
    
    var t = new Date();
    var today = t.getFullYear();
    
    if(t.getMonth()+1 < 10)
        today += '0' + String(t.getMonth()+1);
    else
        today += String(t.getMonth()+1);
    
    if(t.getDate() < 10)
        today += '0' + String(t.getDate());
    else
        today += String(t.getDate());
    
    if(!calendar_t)
    {
        var y = t.getFullYear();
        var m = t.getMonth();
        
        calendar_t = new Date(y, m, 1);
    }
    
    var calendar_yymm = calendar_t.getFullYear();
    calendar_yymm += (calendar_t.getMonth()+1 < 10)? String('0' + (calendar_t.getMonth() + 1)) : String(calendar_t.getMonth()+1);
    
    var calendar_y = Number(calendar_yymm.substring(0, 4));
    var calendar_m = Number(calendar_yymm.substring(4, 6));
    
    var prev_m;
    if(Number(calendar_m) == 1)
    {
        prev_m = String(calendar_y - 1);
        prev_m += 12;
    }
    else
    {
        prev_m = String(calendar_y);
        prev_m += (calendar_m - 1 < 10)? '0' + (calendar_m - 1) : calendar_m - 1;
    }
    var next_m;
    if(Number(calendar_m) == 12)
    {
        next_m = String(calendar_y + 1);
        next_m += '01';
    }
    else
    {
        next_m = String(calendar_y);
        next_m += (calendar_m + 1 < 10)? '0' + (calendar_m + 1) : calendar_m + 1;
    }
    
    calendar_m = (calendar_m < 10)? String('0' + calendar_m) : String(calendar_m);
    var prev_y = String(calendar_y-1) + calendar_m;
    var next_y = String(calendar_y+1) + calendar_m;
    var prev_yy = String(calendar_y-10) + calendar_m;
    var next_yy = String(calendar_y+10) + calendar_m;

    html += "<colgroup>";
    html += "	<col />";
    html += "	<col />";
    html += "	<col />";
    html += "	<col />";
    html += "	<col />";
    html += "	<col />";
    html += "	<col />";
    html += "</colgroup>";
/*
	table.CalendarLayout tr td span.ArrowForward
	{ width: 14px; height: 15px; background: transparent url('/PhoneEnglish/images/Calendar/ArrowForward.gif') no-repeat 0 0; cursor: pointer; }
	table.CalendarLayout tr td span.ArrowBack
	{ width: 14px; height: 15px; background: transparent url('/PhoneEnglish/images/Calendar/ArrowBack.gif') no-repeat 0 0; cursor: pointer; }
	table.CalendarLayout tr td span.ArrowNext
	{ width: 14px; height: 15px; background: transparent url('/PhoneEnglish/images/Calendar/ArrowNext.gif') no-repeat 0 0; cursor: pointer; }
	table.CalendarLayout tr td span.ArrowPrevious
*/


    html += "<tr>";
    html += "<td class=\"CalendarButton\"><span onClick=\"calendar_draw('"+prev_m+"');\" class=\"ButtonPrev\">&nbsp;</span></td>";


    html += "<td colspan=\"5\" class=\"CalendarHeader\">";

	html += " "+calendar_y+"년";
    html += " "+calendar_m+"월";


    html += "<td class=\"CalendarButton\"><span onClick=\"calendar_draw('"+next_m+"');\" class=\"ButtonNext\">&nbsp;</span></td>";

//    html += "</td>";

//    html += "<td align=\"right\" class=\"Space\"><span style=\"cursor: pointer; font-size: 12px; font-weight: bold; color: #f10;\" onclick=\"calendar_close(event)\">X</span></td>";
    html += "</tr>";
    
    html += "<tr>";
    html += "<th class=\"Sun\">SUN</th>";
    html += "<th>MON</th>";
    html += "<th>TUE</th>";
    html += "<th>WED</th>";
    html += "<th>THU</th>";
    html += "<th>FRI</th>";
    html += "<th class=\"Sat\">SAT</th>";
    html += "</tr>";
    
    var week = calendar_t.getDay();
    // 빈 TD 출력
    for(var i=0; i<week; i++)
    {
        html += "<td class=\"Space\">&nbsp;</td>\n";
    }
    
    // 해당월의 마지막 날을 가져옴.
    if(String(calendar_t.getMonth()+1) == '2')
        max_days = ((( calendar_y % 4 == 0) && (calendar_y % 100 != 0)) || (calendar_y % 400 == 0))? 29 : 28;
    else
        max_days = days_arr[calendar_t.getMonth()];
    
    var this_date;
    for(var i=1; i<=max_days; i++)
    {
        if(week > 6)
        {
            html += "</tr>";
            week = 0;
        }
        if(week == 0)
        {
            html += "<tr>";
        }
        
        this_date = calendar_yymm;
        this_date += (i <= 9)? String('0' + i) : String(i);
        
        var style = "cursor: pointer;";
        if(set_date == this_date)
            style += " text-decoration: underline; background: #ff0; color: #629;";
        if(today == this_date)
            style += " font-weight: bolder; color: #000; background: #dff; border: 1px solid #a00;";
        if(week == 0)
            style += " color: #f10;";
        if(week == 6)
            style += " color: #05a;";
        html += "<td style=\""+style+"\" onclick=\"calendar_set_date('"+this_date+"');\">"+i+"</td>";
        week ++;
    }
    
    if(week < 6)
    {
        for(var i=week; i<=6; i++)
        {
            html += "<td>&nbsp;</td>\n";
        }
        html += "</tr>";
    }
    html += "</table>";
    
    calendar_div.innerHTML = html;
}

function calendar_set_date(set_date)
{
    // FMT 변경
    if(calendar_obj)
    {
        calendar_obj.value = set_date.substring(0,4) + '-' + set_date.substring(4,6) + '-' + set_date.substring(6,8); 
        //calendar_obj.value = set_date;
    }
    calendar_close();
}

function calendar_hide()
{
    if(calendar_tt)
        window.clearTimeout(calendar_tt);
    calendar_close();
}

function calendar_afterHide()
{
    if(calendar_tt)
        window.clearTimeout(calendar_tt);
    this.t = window.setTimeout("calendar_hide()", 300);
}

function calendar_clearT()
{
    if(calendar_tt)
        window.clearTimeout(calendar_tt);
}

function calendar(e, obj_name)
{
    if(!e) var e = window.event;
    calendar_obj = document.getElementById(obj_name);
    var default_date = calendar_obj.value.replace(/[^0-9]/g, '');
    
    if(default_date.length != 8)
        default_date = '';
    
    if(!calendar_obj)
    {
        alert(calendar_obj + ' object is null');
        return;
    }
    
    calendar_set(e);
    calendar_draw(default_date);
    
    if(hidden_select)
        show_select();
    
    if(navigator.userAgent.indexOf('Chrome') == -1 && navigator.userAgent.indexOf('Firefox') == -1 && navigator.userAgent.indexOf('Safari') == -1)
    {
        var calendar_div = document.getElementById('calendar_div');
        hide_select(parseInt(calendar_div.style.left), parseInt(calendar_div.style.top), parseInt(calendar_div.style.left) + parseInt(calendar_div.offsetWidth), parseInt(calendar_div.style.top) + parseInt(calendar_div.offsetHeight));
    }
}