Keskustelu: Nettisivujen teko: javascript ongelma

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);
	},

	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 val = 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) + "'>&lt;</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 x=current_year-70; x<current_year+10; x++) {
			this.wrt("<option value='"+x+"'")
			if(x == year) this.wrt(" selected='selected'");
			this.wrt(">"+x+"</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) + "'>&gt;</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 z=0;z<=5;z++) {
			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'>&nbsp;</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);
		}
	}
}

<html>
    <head>
        <meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
         <script src="cal_picker.js" type="text/javascript"></script>
         <link href="stylep.css" rel="stylesheet"  type="text/css"/>

 <script type="text/javascript">
         function setdate(){
            calendar.set("date");
          }
</script>
        <title>JSP Page</title>
    </head>
    <body>
        <form name='form' method='post' action="#">
            <table>
                <tr>
                    <td>
                        päivä:
                        <input type='text' size="10"  value="klikkaa" onclick="setdate();" name="DATE" id="date" > <!-- TODO tähän kenttään myös viikonpäivä ????-->
                    </td>

                </tr>
            </table>
            <input type='submit'  />
        </form>
    </body>
</html>