Codepointng...lets talk code: Date Picker for Date of Birth

<!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>
<script>
calendar = {
month_names: ["January", "February", "March", "April", "May", "June", "July", "August", "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;
if (ths.opt['onDateSelect']) ths.opt['onDateSelect'].apply(ths, [year, month, day]); // Custom handler if the user wants it that way.
else {
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']);
if (this.opt['display_element']) var display_element = document.getElementById(this.opt['display_element']);
else var display_element = document.getElementById(this.opt['input']);
var xy = this.getPosition(display_element);
var width = parseInt(this.getStyle(display_element, '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, opt) {
var input = document.getElementById(input_id);
if (!input) return; //If the input field is not there, exit.
if (opt) this.opt = opt;
if (!this.opt['calendar']) this.init();
var ths = this;
if (this.opt['onclick']) input.onclick = this.opt['onclick'];
else {
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);
}
}
}
</script>
<style>
.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;
}
</style>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
<title>Untitled Document</title>
</head>
<body>
<input type="text" name="date" id="date" />
<script type="text/javascript">
calendar.set("date");
</script>
</body>
</html>

Xceedas

Sunday, 9 November 2014

Date Picker for Date of Birth

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