Lazy load on/off and dropdown button
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<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01//EN" "http://www.w3.org/TR/html4/strict.dtd">
<html>
<head>
<meta http-equiv="content-type" content="text/html; charset=utf-8">
<title>Using A Menu Button To Replace A <select> Element</title>
<style type="text/css">
/*margin and padding on body element
can introduce errors in determining
element position and are not recommended;
we turn them off as a foundation for YUI
CSS treatments. */
body {
margin:0;
padding:0;
}
</style>
<link rel="stylesheet" type="text/css" href="yui_2.7.0b-lib/fonts/fonts-min.css" />
<link rel="stylesheet" type="text/css" href="yui_2.7.0b-lib/menu/assets/skins/sam/menu.css" />
<link rel="stylesheet" type="text/css" href="yui_2.7.0b-lib/button/assets/skins/sam/button.css" />
<script type="text/javascript" src="yui_2.7.0b-lib/yahoo-dom-event/yahoo-dom-event.js"></script>
<script type="text/javascript" src="yui_2.7.0b-lib/container/container_core-min.js"></script>
<script type="text/javascript" src="yui_2.7.0b-lib/menu/menu-min.js"></script>
<script type="text/javascript" src="yui_2.7.0b-lib/element/element-min.js"></script>
<script type="text/javascript" src="yui_2.7.0b-lib/button/button-min.js"></script>
<!--begin custom header content for this example-->
<style type="text/css">
/* Style the <fieldset> since the Reset CSS removes the default style. */
#button-example-form fieldset {
border: 2px groove #ccc;
margin: .5em;
padding: .5em;
}
pre {
border: solid 1px #000;
background-color: #ccc;
padding: 10px;
margin: 10px;
}
.yui-menu-button em.yui-button-label {
font-style: normal;
display: block;
text-align: left;
white-space: nowrap;
/* Restrict the width of the label to 5em. */
width: 5em;
/* Hide the overflow if the text label exceeds 5em in width. */
overflow: hidden;
/*
IE, Safari and Opera support the ability to add ellipsis when the text
label exceeds 10em in width.
*/
text-overflow: ellipsis;
-o-text-overflow: ellipsis;
}
li.yui-button-selectedmenuitem {
background: url(yui_2.7.0b-assets/button-assets/checkbox.png) left center no-repeat;
}
</style>
<!--end custom header content for this example-->
</head>
<body class=" yui-skin-sam">
<h1>Using A Menu Button To Replace A <select> Element</h1>
<div class="exampleIntro">
<p>
This example illustrates how to use Button to mimic the behavior of an
HTML <code><select></code> element.
</p>
</div>
<!--BEGIN SOURCE CODE FOR EXAMPLE -->
<script type="text/javascript">
YAHOO.util.Event.onDOMReady(function () {
var Button = YAHOO.widget.Button;
// "render" event handler for a Button's Menu - responsible for setting
// the default value for the Button's "selectedMenuItem" attribute.
var onMenuRender = function (type, args, button) {
button.set("selectedMenuItem", this.getItem(0));
};
// "selectedMenuItemChange" event handler for a Button that will set
// the Button's "label" attribute to the value of the "text"
// configuration property of the MenuItem that was clicked.
var onSelectedMenuItemChange = function (event) {
var oMenuItem = event.newValue;
this.set("label", ("<em class=\"yui-button-label\">" +
oMenuItem.cfg.getProperty("text") + "</em>"));
};
// "submit" event handler for a Button's parent form - repsonsible for
// rendering a Menu that was to be lazy loaded, but never clicked on,
// and therefore never rendered.
var onFormSubmit = function (event, button) {
var oMenuItem = button.get("selectedMenuItem"),
UA = YAHOO.env.ua,
oEvent,
oMenu;
if (!oMenuItem) {
// Pause submission of the form until the Button's Menu
// is rendered
YAHOO.util.Event.preventDefault(event);
oMenu = button.getMenu();
oMenu.addItems(oMenu.itemData);
oMenu.subscribe("render", function () {
var bSubmitForm;
if (UA.ie) {
bSubmitForm = this.fireEvent("onsubmit");
}
else { // Gecko, Opera, and Safari
oEvent = document.createEvent("HTMLEvents");
oEvent.initEvent("submit", true, true);
bSubmitForm = this.dispatchEvent(oEvent);
}
// In IE and Safari, dispatching a "submit" event to a form
// WILL cause the form's "submit" event to fire, but WILL
// NOT submit the form. Therefore, we need to call the
// "submit" method as well.
if ((UA.ie || UA.webkit) && bSubmitForm) {
this.submit();
}
}, this, true);
oMenu.render(oMenu.cfg.getProperty("container"));
}
};
var oMenuButton1 = new Button({
id: "menubutton-1",
name: "menubutton-1",
label: "<em class=\"yui-button-label\">Option 1</em>",
type: "menu",
menu: "select-1",
container: "select-1-container"
});
// Register a "selectedMenuItemChange" event handler that will sync the
// Button's "label" attribute to the MenuItem that was clicked.
oMenuButton1.on("selectedMenuItemChange", onSelectedMenuItemChange);
var oMenuButton2 = new Button({
id: "menubutton-2",
name: "menubutton-2",
label: "<em class=\"yui-button-label\">Option 1</em>",
type: "menu",
lazyloadmenu: false,
menu: "select-2",
container: "select-2-container"
});
// Register a "selectedMenuItemChange" event handler that will sync the
// Button's "label" attribute to the MenuItem that was clicked.
oMenuButton2.on("selectedMenuItemChange", onSelectedMenuItemChange);
var aMenuButton3MenuData = [
{ text: "Option 1", value: "menubutton-3-1" },
{ text: "Option 2", value: "menubutton-3-2" },
{ text: "Option 3", value: "menubutton-3-3" }
];
var oMenuButton3 = new Button({
id: "menubutton-3",
name: "menubutton-3",
label: "<em class=\"yui-button-label\">Option 1</em>",
type: "menu",
menu: aMenuButton3MenuData,
container: "menubutton-3-container" });
// Register a "selectedMenuItemChange" event handler that will sync the
// Button's "label" attribute to the MenuItem that was clicked.
oMenuButton3.on("selectedMenuItemChange", onSelectedMenuItemChange);
oMenuButton3.on("appendTo", function () {
var oMenu = this.getMenu();
// If a Button's "selectedMenuItem" attribute is set, the selected
// MenuItem's name and value will be part of the form's data set
// when its parent form is submitted. For Buttons with Menus built
// entirely from script, the "selectedMenuItem" property is not
// set by default. To set the "selectedMenuItem" to a default
// value, simply register a "render" event handler for the Button's
// Menu that sets the Button's "selectedMenuItem" attribute to the
// desired item in the Menu.
oMenu.subscribe("render", onMenuRender, this);
// The items in a Button's Menu are lazy loaded by default: loaded
// when the Button is initially clicked. If the user never clicks
// on the Button, its Menu will never be rendered, meaning the
// "render" event handler registered above will never be called,
// and the default value for the Button's "selectMenuItem"
// attribute will never be set. Therefore, add a "submit" event
// handler to the Button's parent form that will render the Menu
// if the Button's "selectedMenuItem" attribute is not set.
YAHOO.util.Event.on(this.getForm(), "submit", onFormSubmit, this);
});
var aMenuButton4MenuData = [
{ text: "Option 1", value: "menubutton-4-1" },
{ text: "Option 2", value: "menubutton-4-2" },
{ text: "Option 3", value: "menubutton-4-3" }
];
var oMenuButton4 = new Button({
id: "menubutton-4",
name: "menubutton-4",
label: "<em class=\"yui-button-label\">Option 1</em>",
type: "menu",
lazyloadmenu: false,
menu: aMenuButton4MenuData,
container: "menubutton-4-container" });
var oMenuButton4Menu = oMenuButton4.getMenu();
// If a Button's "selectedMenuItem" attribute is set, the selected
// MenuItem's name and value will be part of the form's data set
// when its parent form is submitted. For Buttons with Menus built
// entirely from script, the "selectedMenuItem" property is not set by
// default. To set the "selectedMenuItem" to a default value, simply
// register a "render" event handler for the Button's Menu that sets
// the Button's "selectedMenuItem" attribute to the desired item in
// the Menu.
oMenuButton4Menu.subscribe("render", onMenuRender, oMenuButton4);
// Register a "selectedMenuItemChange" event handler that will sync the
// Button's "label" attribute to the MenuItem that was clicked.
oMenuButton4.on("selectedMenuItemChange", onSelectedMenuItemChange);
var oMenuButton5 = new Button({
id: "menubutton-5",
name: "menubutton-5",
label: "<em class=\"yui-button-label\">None</em>",
type: "menu",
menu: "select-3",
container: "select-3-container" });
// Register a "selectedMenuItemChange" event handler that will sync the
// Button's "label" attribute to the MenuItem that was clicked.
oMenuButton5.on("selectedMenuItemChange", onSelectedMenuItemChange);
var oMenuButton6 = new Button({
id: "menubutton-6",
name: "menubutton-6",
label: "<em class=\"yui-button-label\">None</em>",
type: "menu",
lazyloadmenu: false,
menu: "select-4",
container: "select-4-container" });
// Register a "selectedMenuItemChange" event handler that will sync the
// Button's "label" attribute to the MenuItem that was clicked.
oMenuButton6.on("selectedMenuItemChange", onSelectedMenuItemChange);
var aMenuButton7MenuData = [
"None",
{ text: "Option 1", value: "menubutton-7-1" },
{ text: "Option 2", value: "menubutton-7-2" },
{ text: "Option 3", value: "menubutton-7-3" }
];
var oMenuButton7 = new Button({
id: "menubutton-7",
name: "menubutton-7",
label: "<em class=\"yui-button-label\">None</em>",
type: "menu",
menu: aMenuButton7MenuData,
container: "menubutton-7-container" });
// Register a "selectedMenuItemChange" event handler that will sync the
// Button's "label" attribute to the MenuItem that was clicked.
oMenuButton7.on("selectedMenuItemChange", onSelectedMenuItemChange);
var aMenuButton8MenuData = [
"None",
{ text: "Option 1", value: "menubutton-8-1" },
{ text: "Option 2", value: "menubutton-8-2" },
{ text: "Option 3", value: "menubutton-8-3" }
];
var oMenuButton8 = new Button({
id: "menubutton-8",
name: "menubutton-8",
label: "<em class=\"yui-button-label\">None</em>",
type: "menu",
lazyloadmenu: false,
menu: aMenuButton8MenuData,
container: "menubutton-8-container" });
// Register a "selectedMenuItemChange" event handler that will sync the
// Button's "label" attribute to the MenuItem that was clicked.
oMenuButton8.on("selectedMenuItemChange", onSelectedMenuItemChange);
});
</script>
<form name="button-example-form" id="button-example-form" method="post" action="#">
<fieldset>
<legend>With A Default Value</legend>
<fieldset>
<legend>Using Existing Markup</legend>
<fieldset>
<legend>Lazy load on</legend>
<label id="select-1-container">
Choose a value:
<select id="select-1" name="select-1">
<option value="select-1-1" selected>Option 1</option>
<option value="select-1-2">Option 2</option>
<option value="select-1-3">Option 3</option>
</select>
</label>
</fieldset>
<fieldset>
<legend>Lazy load off</legend>
<label id="select-2-container">
Choose a value:
<select id="select-2" name="select-2">
<option value="select-2-1" selected>Option 1</option>
<option value="select-2-2">Option 2</option>
<option value="select-2-3">Option 3</option>
</select>
</label>
</fieldset>
</fieldset>
<fieldset>
<legend>Without Existing Markup</legend>
<fieldset>
<legend>Lazy load on</legend>
<label id="menubutton-3-container">Choose a value: </label>
</fieldset>
<fieldset>
<legend>Lazy load off</legend>
<label id="menubutton-4-container">Choose a value: </label>
</fieldset>
</fieldset>
</fieldset>
<fieldset>
<legend>Without A Default Value</legend>
<fieldset>
<legend>Using Existing Markup</legend>
<fieldset>
<legend>Lazy load on</legend>
<label id="select-3-container">
Choose a value:
<select id="select-3" name="select-3">
<option value="">None</option>
<option value="select-3-1">Option 1</option>
<option value="select-3-2">Option 2</option>
<option value="select-3-3">Option 3</option>
</select>
</label>
</fieldset>
<fieldset>
<legend>Lazy load off</legend>
<label id="select-4-container">
Choose a value
<select id="select-4" name="select-4">
<option value="">None</option>
<option value="select-4-1">Option 1</option>
<option value="select-4-2">Option 2</option>
<option value="select-4-3">Option 3</option>
</select>
</label>
</fieldset>
</fieldset>
<fieldset>
<legend>Without Existing Markup</legend>
<fieldset>
<legend>Lazy load on</legend>
<label id="menubutton-7-container">Choose a value: </label>
</fieldset>
<fieldset>
<legend>Lazy load off</legend>
<label id="menubutton-8-container">Choose a value: </label>
</fieldset>
</fieldset>
</fieldset>
<div>
<input type="submit" id="submit-button" name="submit-button" value="Submit Form">
</div>
</form>
<!--END SOURCE CODE FOR EXAMPLE -->
</body>
</html>
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