jquery calendar

/**
the script only works on "input [type=text]"


**/


// don't declare anything out here in the global namespace


(function($) { // create private scope (inside you can use $ instead of jQuery)


    // functions and vars declared here are effectively 'singletons'.  there will be only a single
    // instance of them.  so this is a good place to declare any immutable items or stateless
    // functions.  for example:


var today = new Date(); // used in defaults
    var months = 'January,February,March,April,May,June,July,August,September,October,November,December'.split(',');
var monthlengths = '31,28,31,30,31,30,31,31,30,31,30,31'.split(',');
  var dateRegEx = /^\d{1,2}\/\d{1,2}\/\d{2}|\d{4}$/;
var yearRegEx = /^\d{4,4}$/;


    // next, declare the plugin function
    $.fn.simpleDatepicker = function(options) {


        // functions and vars declared here are created each time your plugn function is invoked


        // you could probably refactor your 'build', 'load_month', etc, functions to be passed
        // the DOM element from below


var opts = jQuery.extend({}, jQuery.fn.simpleDatepicker.defaults, options);

// replaces a date string with a date object in opts.startdate and opts.enddate, if one exists
// populates two new properties with a ready-to-use year: opts.startyear and opts.endyear

setupYearRange();
/** extracts and setup a valid year range from the opts object **/
function setupYearRange () {

var startyear, endyear;  
if (opts.startdate.constructor == Date) {
startyear = opts.startdate.getFullYear();
} else if (opts.startdate) {
if (yearRegEx.test(opts.startdate)) {
startyear = opts.startdate;
} else if (dateRegEx.test(opts.startdate)) {
opts.startdate = new Date(opts.startdate);
startyear = opts.startdate.getFullYear();
} else {
startyear = today.getFullYear();
}
} else {
startyear = today.getFullYear();
}
opts.startyear = startyear;

if (opts.enddate.constructor == Date) {
endyear = opts.enddate.getFullYear();
} else if (opts.enddate) {
if (yearRegEx.test(opts.enddate)) {
endyear = opts.enddate;
} else if (dateRegEx.test(opts.enddate)) {
opts.enddate = new Date(opts.enddate);
endyear = opts.enddate.getFullYear();
} else {
endyear = today.getFullYear();
}
} else {
endyear = today.getFullYear();
}
opts.endyear = endyear;
}

/** HTML factory for the actual datepicker table element **/
// has to read the year range so it can setup the correct years in our HTML <select>
function newDatepickerHTML () {

var years = [];

// process year range into an array
for (var i = 0; i <= opts.endyear - opts.startyear; i ++) years[i] = opts.startyear + i;

// build the table structure
var table = jQuery('<table class="datepicker" cellpadding="0" cellspacing="0"></table>');
table.append('<thead></thead>');
table.append('<tfoot></tfoot>');
table.append('<tbody></tbody>');

// month select field
var monthselect = '<select name="month">';
for (var i in months) monthselect += '<option value="'+i+'">'+months[i]+'</option>';
monthselect += '</select>';

// year select field
var yearselect = '<select name="year">';
for (var i in years) yearselect += '<option>'+years[i]+'</option>';
yearselect += '</select>';

jQuery("thead",table).append('<tr class="controls"><th colspan="7"><span class="prevMonth">&laquo;</span>&nbsp;'+monthselect+yearselect+'&nbsp;<span class="nextMonth">&raquo;</span></th></tr>');
jQuery("thead",table).append('<tr class="days"><th>S</th><th>M</th><th>T</th><th>W</th><th>T</th><th>F</th><th>S</th></tr>');
jQuery("tfoot",table).append('<tr><td colspan="2"><span class="today">today</span></td><td colspan="3">&nbsp;</td><td colspan="2"><span class="close">close</span></td></tr>');
for (var i = 0; i < 6; i++) jQuery("tbody",table).append('<tr><td></td><td></td><td></td><td></td><td></td><td></td><td></td></tr>');
return table;
}

/** get the real position of the input (well, anything really) **/
//http://www.quirksmode.org/js/findpos.html
function findPosition (obj) {
var curleft = curtop = 0;
if (obj.offsetParent) {
do { 
curleft += obj.offsetLeft;
curtop += obj.offsetTop;
} while (obj = obj.offsetParent);
return [curleft,curtop];
} else {
return false;
}
}

/** load the initial date and handle all date-navigation **/
// initial calendar load (e is null)
// prevMonth & nextMonth buttons
// onchange for the select fields
function loadMonth (e, el, datepicker, chosendate) {

// reference our years for the nextMonth and prevMonth buttons
var mo = jQuery("select[name=month]", datepicker).get(0).selectedIndex;
var yr = jQuery("select[name=year]", datepicker).get(0).selectedIndex;
var yrs = jQuery("select[name=year] option", datepicker).get().length;

// first try to process buttons that may change the month we're on
if (e && jQuery(e.target).hasClass('prevMonth')) {
if (0 == mo && yr) {
yr -= 1; mo = 11;
jQuery("select[name=month]", datepicker).get(0).selectedIndex = 11;
jQuery("select[name=year]", datepicker).get(0).selectedIndex = yr;
} else {
mo -= 1;
jQuery("select[name=month]", datepicker).get(0).selectedIndex = mo;
}
} else if (e && jQuery(e.target).hasClass('nextMonth')) {
if (11 == mo && yr + 1 < yrs) {
yr += 1; mo = 0;
jQuery("select[name=month]", datepicker).get(0).selectedIndex = 0;
jQuery("select[name=year]", datepicker).get(0).selectedIndex = yr;
} else { 
mo += 1;
jQuery("select[name=month]", datepicker).get(0).selectedIndex = mo;
}
}

// maybe hide buttons
if (0 == mo && !yr) jQuery("span.prevMonth", datepicker).hide(); 
else jQuery("span.prevMonth", datepicker).show(); 
if (yr + 1 == yrs && 11 == mo) jQuery("span.nextMonth", datepicker).hide(); 
else jQuery("span.nextMonth", datepicker).show(); 

// clear the old cells
var cells = jQuery("tbody td", datepicker).unbind().empty().removeClass('date');

// figure out what month and year to load
var m = jQuery("select[name=month]", datepicker).val();
var y = jQuery("select[name=year]", datepicker).val();
var d = new Date(y, m, 1);
var startindex = d.getDay();
var numdays = monthlengths[m];

// http://en.wikipedia.org/wiki/Leap_year
if (1 == m && ((y%4 == 0 && y%100 != 0) || y%400 == 0)) numdays = 29;

// test for end dates (instead of just a year range)
if (opts.startdate.constructor == Date) {
var startMonth = opts.startdate.getMonth();
var startDate = opts.startdate.getDate();
}
if (opts.enddate.constructor == Date) {
var endMonth = opts.enddate.getMonth();
var endDate = opts.enddate.getDate();
}

// walk through the index and populate each cell, binding events too
for (var i = 0; i < numdays; i++) {

var cell = jQuery(cells.get(i+startindex)).removeClass('chosen');

// test that the date falls within a range, if we have a range
if ( 
(yr || ((!startDate && !startMonth) || ((i+1 >= startDate && mo == startMonth) || mo > startMonth))) &&
(yr + 1 < yrs || ((!endDate && !endMonth) || ((i+1 <= endDate && mo == endMonth) || mo < endMonth)))) {

cell
.text(i+1)
.addClass('date')
.hover(
function () { jQuery(this).addClass('over'); },
function () { jQuery(this).removeClass('over'); })
.click(function () {
var chosenDateObj = new Date(jQuery("select[name=year]", datepicker).val(), jQuery("select[name=month]", datepicker).val(), jQuery(this).text());
closeIt(el, datepicker, chosenDateObj);
});

// highlight the previous chosen date
if (i+1 == chosendate.getDate() && m == chosendate.getMonth() && y == chosendate.getFullYear()) cell.addClass('chosen');
}
}
}

/** closes the datepicker **/
// sets the currently matched input element's value to the date, if one is available
// remove the table element from the DOM
// indicate that there is no datepicker for the currently matched input element
function closeIt (el, datepicker, dateObj) { 
if (dateObj && dateObj.constructor == Date)
el.val(jQuery.fn.simpleDatepicker.formatOutput(dateObj));
datepicker.remove();
datepicker = null;
jQuery.data(el.get(0), "simpleDatepicker", { hasDatepicker : false });
}


        // iterate the matched nodeset
        return this.each(function() {

            // functions and vars declared here are created for each matched element. so if
            // your functions need to manage or access per-node state you can defined them
            // here and use $this to get at the DOM element

if ( jQuery(this).is('input') && 'text' == jQuery(this).attr('type')) {


var datepicker; 
jQuery.data(jQuery(this).get(0), "simpleDatepicker", { hasDatepicker : false });

// open a datepicker on the click event
jQuery(this).click(function (ev) {
 
var $this = jQuery(ev.target);

if (false == jQuery.data($this.get(0), "simpleDatepicker").hasDatepicker) {

// store data telling us there is already a datepicker
jQuery.data($this.get(0), "simpleDatepicker", { hasDatepicker : true });

// validate the form's initial content for a date
var initialDate = $this.val();

if (initialDate && dateRegEx.test(initialDate)) {
var chosendate = new Date(initialDate);
} else if (opts.chosendate.constructor == Date) {
var chosendate = opts.chosendate;
} else if (opts.chosendate) {
var chosendate = new Date(opts.chosendate);
} else {
var chosendate = today;
}

// insert the datepicker in the DOM
datepicker = newDatepickerHTML();
jQuery("body").prepend(datepicker);

// position the datepicker
var elPos = findPosition($this.get(0));
var x = (parseInt(opts.x) ? parseInt(opts.x) : 0) + elPos[0];
var y = (parseInt(opts.y) ? parseInt(opts.y) : 0) + elPos[1];
jQuery(datepicker).css({ position: 'absolute', left: x, top: y });

// bind events to the table controls
jQuery("span", datepicker).css("cursor","pointer");
jQuery("select", datepicker).bind('change', function () { loadMonth (null, $this, datepicker, chosendate); });
jQuery("span.prevMonth", datepicker).click(function (e) { loadMonth (e, $this, datepicker, chosendate); });
jQuery("span.nextMonth", datepicker).click(function (e) { loadMonth (e, $this, datepicker, chosendate); });
jQuery("span.today", datepicker).click(function () { closeIt($this, datepicker, new Date()); });
jQuery("span.close", datepicker).click(function () { closeIt($this, datepicker); });

// set the initial values for the month and year select fields
// and load the first month
jQuery("select[name=month]", datepicker).get(0).selectedIndex = chosendate.getMonth();
jQuery("select[name=year]", datepicker).get(0).selectedIndex = Math.max(0, chosendate.getFullYear() - opts.startyear);
loadMonth(null, $this, datepicker, chosendate);
}

});
}


        });


    };


    // finally, I like to expose default plugin options as public so they can be manipulated.  one
    // way to do this is to add a property to the already-public plugin fn


jQuery.fn.simpleDatepicker.formatOutput = function (dateObj) {
return (dateObj.getMonth() + 1) + "/" + dateObj.getDate() + "/" + dateObj.getFullYear();
};

jQuery.fn.simpleDatepicker.defaults = {
// date string matching /^\d{1,2}\/\d{1,2}\/\d{2}|\d{4}$/
chosendate : today,

// date string matching /^\d{1,2}\/\d{1,2}\/\d{2}|\d{4}$/
// or four digit year
startdate : today.getFullYear(), 
enddate : today.getFullYear() + 1,

// offset from the top left corner of the input element
x : 18, // must be in px
y : 18 // must be in px
};

})(jQuery);

/ css

@charset "utf-8";
/* CSS Document */


.datepicker { border-collapse: collapse; border: 2px solid #999; position: absolute; }
.datepicker tr.controls th { height: 22px; font-size: 11px; }
.datepicker select { font-size: 11px; }
.datepicker tr.days th { height: 18px; }
.datepicker tfoot td { height: 18px; text-align: center; text-transform: capitalize; }
.datepicker th, .datepicker tfoot td { background: #eee; font: 10px/18px Verdana, Arial, Helvetica, sans-serif; }
.datepicker th span, .datepicker tfoot td span { font-weight: bold; }


.datepicker tbody td { width: 24px; height: 24px; border: 1px solid #ccc; font: 11px/22px Arial, Helvetica, sans-serif; text-align: center; background: #fff; }
.datepicker tbody td.date { cursor: pointer; }
.datepicker tbody td.date.over { background-color: #99ffff; }
.datepicker tbody td.date.chosen { font-weight: bold; background-color: #ccffcc; }

//html

<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
<title>无标题文档</title>
<link href="calendar.css" rel="stylesheet" type="text/css" /> 
</head>


<body>
<p><input class="one" type="text" name="date" value="" /> 
<input class="two" type="text" name="date" value="" /> 
<input class="three" type="text" name="date" value="" /></p> 
 
<p>Some more test inputs, each with the same setup:</p> 
<p><input class="four" type="text" name="date" value="" /> </p>
</body>
<script type="text/javascript" src="jquery.1.6.4.js"></script> 
<script type="text/javascript" src="cal.js"></script> 
<script type="text/javascript"> 
 
jQuery(document).ready(function () {

$('input.one').simpleDatepicker();
$('input.two').simpleDatepicker({ startdate: 2008, enddate: 2012 });
$('input.three').simpleDatepicker({ chosendate: '9/9/2010', startdate: '6/10/2008', enddate: '7/20/2011' });
$('input.four').simpleDatepicker({ x: 45, y: 3 });
});
</script> 
</html>