YUI Library Examples: Button Control: Calendar Menu Button

Begin by instantiating a Button of type "menu" and an Overlay instance that will house a Calendar instance.


1	// Create a Overlay instance to house the Calendar instance
2
3	var oCalendarMenu = new YAHOO.widget.Overlay("calendarmenu", { visible: false });
4
5
6	// Create a Button instance of type "menu"
7
8	var oButton = new YAHOO.widget.Button({
9	type: "menu",
10	id: "calendarpicker",
11	label: "Choose A Date",
12	menu: oCalendarMenu,
13	container: "datefields" });
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Once the new Button is created, add a listener for its "appendTo" event that will be used to render its Overlay instance into the same DOM element specified as the containing element for the Button.


1	oButton.on("appendTo", function () {
2
3	/*
4	Create an empty body element for the Overlay instance in order
5	to reserve space to render the Calendar instance into.
6	*/
7
8	oCalendarMenu.setBody(" ");
9
10	oCalendarMenu.body.id = "calendarcontainer";
11
12
13	// Render the Overlay instance into the Button's parent element
14
15	oCalendarMenu.render(this.get("container"));
16
17	});
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Once the new Button is created, add a listener for its "click" event that will be used to create a new Calendar instance. (Defering the creation and rendering of the Calendar until the firing of the "click" event improves the intial load time of the Button instance.)


1	function onButtonClick() {
2
3	/*
4	Create a Calendar instance and render it into the body
5	element of the Overlay.
6	*/
7
8	var oCalendar = new YAHOO.widget.Calendar("buttoncalendar", oCalendarMenu.body.id);
9
10	oCalendar.render();
11
12
13
14	/*
15	Subscribe to the Calendar instance's "changePage" event to
16	keep the Overlay visible when either the previous or next page
17	controls are clicked.
18	*/
19
20	oCalendar.changePageEvent.subscribe(function () {
21
22	window.setTimeout(function () {
23
24	oCalendarMenu.show();
25
26	}, 0);
27
28	});
29
30
31	/*
32	Subscribe to the Calendar instance's "select" event to
33	update the Button instance's label when the user
34	selects a date.
35	*/
36
37	oCalendar.selectEvent.subscribe(function (p_sType, p_aArgs) {
38
39	var aDate,
40	nMonth,
41	nDay,
42	nYear;
43
44	if (p_aArgs) {
45
46	aDate = p_aArgs[0][0];
47
48	nMonth = aDate[1];
49	nDay = aDate[2];
50	nYear = aDate[0];
51
52	oButton.set("label", (nMonth + "/" + nDay + "/" + nYear));
53
54
55	// Sync the Calendar instance's selected date with the date form fields
56
57	YAHOO.util.Dom.get("month").selectedIndex = (nMonth - 1);
58	YAHOO.util.Dom.get("day").selectedIndex = (nDay - 1);
59	YAHOO.util.Dom.get("year").value = nYear;
60
61	}
62
63	oCalendarMenu.hide();
64
65	});
66
67
68	/*
69	Unsubscribe from the "click" event so that this code is
70	only executed once
71	*/
72
73	this.unsubscribe("click", onButtonClick);
74
75	}
76
77
78	/*
79	Add a listener for the "click" event. This listener will be
80	used to defer the creation the Calendar instance until the
81	first time the Button's Overlay instance is requested to be displayed
82	by the user.
83	*/
84
85	oButton.on("click", onButtonClick);
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function onButtonClick() {

/*
		 Create a Calendar instance and render it into the body 
		 element of the Overlay.
	*/

var oCalendar = new YAHOO.widget.Calendar("buttoncalendar", oCalendarMenu.body.id);

oCalendar.render();

/* 
		Subscribe to the Calendar instance's "changePage" event to 
		keep the Overlay visible when either the previous or next page
		controls are clicked.
	*/

oCalendar.changePageEvent.subscribe(function () {
		
		window.setTimeout(function () {

oCalendarMenu.show();
		
		}, 0);
	
	});

/*
		Subscribe to the Calendar instance's "select" event to 
		update the Button instance's label when the user
		selects a date.
	*/

oCalendar.selectEvent.subscribe(function (p_sType, p_aArgs) {

var aDate,
			nMonth,
			nDay,
			nYear;

if (p_aArgs) {
			
			aDate = p_aArgs[0][0];

nMonth = aDate[1];
			nDay = aDate[2];
			nYear = aDate[0];

oButton.set("label", (nMonth + "/" + nDay + "/" + nYear));

// Sync the Calendar instance's selected date with the date form fields

YAHOO.util.Dom.get("month").selectedIndex = (nMonth - 1);
			YAHOO.util.Dom.get("day").selectedIndex = (nDay - 1);
			YAHOO.util.Dom.get("year").value = nYear;

}
		
		oCalendarMenu.hide();
	
	});

/*
		 Unsubscribe from the "click" event so that this code is 
		 only executed once
	*/

this.unsubscribe("click", onButtonClick);

}

/*
	Add a listener for the "click" event.  This listener will be
	used to defer the creation the Calendar instance until the 
	first time the Button's Overlay instance is requested to be displayed
	by the user.
*/

oButton.on("click", onButtonClick);

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YUI Library Examples: Button Control: Calendar Menu Button

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