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# YUI Library Examples: Button Control: Calendar Menu Button

# Button Control: Calendar Menu Button

This example demonstrates how to create a Menu Button whose Menu displays a Calendar. Selecting a date from the Calendar updates the label of the Button to reflect the currently selected date.

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

// Create a Overlay instance to house the Calendar instance var oCalendarMenu = new YAHOO.widget.Overlay("calendarmenu", { visible: false }); // Create a Button instance of type "menu" var oButton = new YAHOO.widget.Button({ type: "menu", id: "calendarpicker", label: "Choose A Date", menu: oCalendarMenu, container: "datefields" });

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.

oButton.on("appendTo", function () { /* Create an empty body element for the Overlay instance in order to reserve space to render the Calendar instance into. */ oCalendarMenu.setBody(" "); oCalendarMenu.body.id = "calendarcontainer"; // Render the Overlay instance into the Button's parent element oCalendarMenu.render(this.get("container")); });

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.)

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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### Button Control Examples:

### More Button Control Resources:

- User's Guide (external)
- API Documentation
- Cheat Sheet PDF (external)

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