javascript日历的代码
代码在于叨登
一直写后台，需要写个前台的js，有着本能地拒绝，其实网上查查就是这么回事，动手比什么都强。
粗糙但能用的代码如下：
test.html
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01//EN" "http://www.w3.org/TR/html4/strict.dtd">
<html>
<head>
<link rel="stylesheet" type="text/css" href="mystyle.css">
<script type="text/javascript" src="calendar.js"></script>
</head>
<body>
<input type="text" name="date" id="date" />
<script type="text/javascript">
calendar.set("date");
</script>
</body>
</html> mystyle.css
.calendar-box {
display:none;
background-color:#fff;
border:1px solid #444;
position:absolute;
width:250px;
padding: 0 5px;
}
.calendar-box select.calendar-month {
width:90px;
}
.calendar-box select.calendar-year {
width:70px;
}
.calendar-box .calendar-cancel {
width:100%;
}
.calendar-box table td {
width:14%;
}
.calendar-box .calendar-title {
text-align:center;
}
.calendar-box a {
text-decoration:none;
}
.calendar-box .today a {
padding:0 5px;
margin-left:-5px;
background-color:#ffe9c6;
}
.calendar-box .selected a {
padding:0 5px;
margin-left:-5px;
background-color:#c9ff8b;
} calendar.js
/**
* Calendar Script
* Creates a calendar widget which can be used to select the date more easily than using just a text box
* http://www.openjs.com/scripts/ui/calendar/
*
* Example:
* <input type="text" name="date" id="date" />
* <script type="text/javascript">
* calendar.set("date");
* </script>
*/
calendar = {
month_names: ["January","February","March","April","May","June","July","Augest","September","October","November","December"],
weekdays: ["Sun", "Mon", "Tue", "Wed", "Thu", "Fri", "Sat"],
month_days: [31,28,31,30,31,30,31,31,30,31,30,31],
//Get today's date - year, month, day and date
today : new Date(),
opt : {},
data: [],
//Functions
/// Used to create HTML in a optimized way.
wrt:function(txt) {
this.data.push(txt);
},
/* Inspired by http://www.quirksmode.org/dom/getstyles.html */
getStyle: function(ele, property){
if (ele.currentStyle) {
var alt_property_name = property.replace(/\-(\w)/g,function(m,c){return c.toUpperCase();});//background-color becomes backgroundColor
var value = ele.currentStyle[property]||ele.currentStyle[alt_property_name];
} else if (window.getComputedStyle) {
property = property.replace(/([A-Z])/g,"-$1").toLowerCase();//backgroundColor becomes background-color
var value = document.defaultView.getComputedStyle(ele,null).getPropertyValue(property);
}
//Some properties are special cases
if(property == "opacity" && ele.filter) value = (parseFloat( ele.filter.match(/opacity\=([^)]*)/)[1] ) / 100);
else if(property == "width" && isNaN(value)) value = ele.clientWidth || ele.offsetWidth;
else if(property == "height" && isNaN(value)) value = ele.clientHeight || ele.offsetHeight;
return value;
},
getPosition:function(ele) {
var x = 0;
var y = 0;
while (ele) {
x += ele.offsetLeft;
y += ele.offsetTop;
ele = ele.offsetParent;
}
if (navigator.userAgent.indexOf("Mac") != -1 && typeof document.body.leftMargin != "undefined") {
x += document.body.leftMargin;
offsetTop += document.body.topMargin;
}
var xy = new Array(x,y);
return xy;
},
/// Called when the user clicks on a date in the calendar.
selectDate:function(year,month,day) {
var ths = _calendar_active_instance;
document.getElementById(ths.opt["input"]).value = year + "-" + month + "-" + day; // Date format is :HARDCODE:
ths.hideCalendar();
},
/// Creates a calendar with the date given in the argument as the selected date.
makeCalendar:function(year, month, day) {
year = parseInt(year);
month= parseInt(month);
day = parseInt(day);
//Display the table
var next_month = month+1;
var next_month_year = year;
if(next_month>=12) {
next_month = 0;
next_month_year++;
}
var previous_month = month-1;
var previous_month_year = year;
if(previous_month< 0) {
previous_month = 11;
previous_month_year--;
}
this.wrt("<table>");
this.wrt("<tr><th><a href='javascript:calendar.makeCalendar("+(previous_month_year)+","+(previous_month)+");' title='"+this.month_names[previous_month]+" "+(previous_month_year)+"'><</a></th>");
this.wrt("<th colspan='5' class='calendar-title'><select name='calendar-month' class='calendar-month' onChange='calendar.makeCalendar("+year+",this.value);'>");
for(var i in this.month_names) {
this.wrt("<option value='"+i+"'");
if(i == month) this.wrt(" selected='selected'");
this.wrt(">"+this.month_names[i]+"</option>");
}
this.wrt("</select>");
this.wrt("<select name='calendar-year' class='calendar-year' onChange='calendar.makeCalendar(this.value, "+month+");'>");
var current_year = this.today.getYear();
if(current_year < 1900) current_year += 1900;
for(var i=current_year-70; i<current_year+10; i++) {
this.wrt("<option value='"+i+"'")
if(i == year) this.wrt(" selected='selected'");
this.wrt(">"+i+"</option>");
}
this.wrt("</select></th>");
this.wrt("<th><a href='javascript:calendar.makeCalendar("+(next_month_year)+","+(next_month)+");' title='"+this.month_names[next_month]+" "+(next_month_year)+"'>></a></th></tr>");
this.wrt("<tr class='header'>");
for(var weekday=0; weekday<7; weekday++) this.wrt("<td>"+this.weekdays[weekday]+"</td>");
this.wrt("</tr>");
//Get the first day of this month
var first_day = new Date(year,month,1);
var start_day = first_day.getDay();
var d = 1;
var flag = 0;
//Leap year support
if(year % 4 == 0) this.month_days[1] = 29;
else this.month_days[1] = 28;
var days_in_this_month = this.month_days[month];
//Create the calender
for(var i=0;i<=5;i++) {
if(w >= days_in_this_month) break;
this.wrt("<tr>");
for(var j=0;j<7;j++) {
if(d > days_in_this_month) flag=0; //If the days has overshooted the number of days in this month, stop writing
else if(j >= start_day && !flag) flag=1;//If the first day of this month has come, start the date writing
if(flag) {
var w = d, mon = month+1;
if(w < 10) w = "0" + w;
if(mon < 10)mon = "0" + mon;
//Is it today?
var class_name = '';
var yea = this.today.getYear();
if(yea < 1900) yea += 1900;
if(yea == year && this.today.getMonth() == month && this.today.getDate() == d) class_name = " today";
if(day == d) class_name += " selected";
class_name += " " + this.weekdays[j].toLowerCase();
this.wrt("<td class='days"+class_name+"'><a href='javascript:calendar.selectDate(\""+year+"\",\""+mon+"\",\""+w+"\")'>"+w+"</a></td>");
d++;
} else {
this.wrt("<td class='days'> </td>");
}
}
this.wrt("</tr>");
}
this.wrt("</table>");
this.wrt("<input type='button' value='Cancel' class='calendar-cancel' onclick='calendar.hideCalendar();' />");
document.getElementById(this.opt['calendar']).innerHTML = this.data.join("");
this.data = [];
},
/// Display the calendar - if a date exists in the input box, that will be selected in the calendar.
showCalendar: function() {
var input = document.getElementById(this.opt['input']);
//Position the div in the correct location...
var div = document.getElementById(this.opt['calendar']);
var xy = this.getPosition(input);
var width = parseInt(this.getStyle(input,'width'));
div.style.left=(xy[0]+width+10)+"px";
div.style.top=xy[1]+"px";
// Show the calendar with the date in the input as the selected date
var existing_date = new Date();
var date_in_input = input.value;
if(date_in_input) {
var selected_date = false;
var date_parts = date_in_input.split("-");
if(date_parts.length == 3) {
date_parts[1]--; //Month starts with 0
selected_date = new Date(date_parts[0], date_parts[1], date_parts[2]);
}
if(selected_date && !isNaN(selected_date.getYear())) { //Valid date.
existing_date = selected_date;
}
}
var the_year = existing_date.getYear();
if(the_year < 1900) the_year += 1900;
this.makeCalendar(the_year, existing_date.getMonth(), existing_date.getDate());
document.getElementById(this.opt['calendar']).style.display = "block";
_calendar_active_instance = this;
},
/// Hides the currently show calendar.
hideCalendar: function(instance) {
var active_calendar_id = "";
if(instance) active_calendar_id = instance.opt['calendar'];
else active_calendar_id = _calendar_active_instance.opt['calendar'];
if(active_calendar_id) document.getElementById(active_calendar_id).style.display = "none";
_calendar_active_instance = {};
},
/// Setup a text input box to be a calendar box.
set: function(input_id) {
var input = document.getElementById(input_id);
if(!input) return; //If the input field is not there, exit.
if(!this.opt['calendar']) this.init();
var ths = this;
input.onclick=function(){
ths.opt['input'] = this.id;
ths.showCalendar();
};
},
/// Will be called once when the first input is set.
init: function() {
if(!this.opt['calendar'] || !document.getElementById(this.opt['calendar'])) {
var div = document.createElement('div');
if(!this.opt['calendar']) this.opt['calendar'] = 'calender_div_'+ Math.round(Math.random() * 100);
div.setAttribute('id',this.opt['calendar']);
div.className="calendar-box";
document.getElementsByTagName("body")[0].insertBefore(div,document.getElementsByTagName("body")[0].firstChild);
}
}
}
引用：
http://www.openjs.com/scripts/ui/calendar/