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---
title: Accordion
order: 10
layout: page
---
[[layout.accordion]]
= Accordion
ifdef::web[]
[.sampler]
image:{live-demo-image}[alt="Live Demo", link="http://demo.vaadin.com/sampler/#ui/structure/accordion"]
endif::web[]
[classname]#Accordion# is a multicomponent container similar to
[classname]#TabSheet#, except that the "tabs" are arranged vertically. Clicking
on a tab opens its contained component in the space between the tab and the next
one. You can use an [classname]#Accordion# identically to a
[classname]#TabSheet#, which it actually inherits. See
<<layout-tabsheet#layout.tabsheet,"TabSheet">>
for more information.
The following example shows how you can create a simple accordion. As the
[classname]#Accordion# is rather naked alone, we put it inside a Panel that acts
as its caption and provides it a border.
[source, java]
----
// Create the accordion
Accordion accordion = new Accordion();
// Create the first tab, specify caption when adding
Layout tab1 = new VerticalLayout(); // Wrap in a layout
tab1.addComponent(new Image(null, // No component caption
new ThemeResource("img/planets/Mercury.jpg")));
accordion.addTab(tab1, "Mercury",
new ThemeResource("img/planets/Mercury_symbol.png"));
// This tab gets its caption from the component caption
Component tab2 = new Image("Venus",
new ThemeResource("img/planets/Venus.jpg"));
accordion.addTab(tab2).setIcon(
new ThemeResource("img/planets/Venus_symbol.png"));
// And so forth the other tabs...
String[] tabs = {"Earth", "Mars", "Jupiter", "Saturn"};
for (String caption: tabs) {
String basename = "img/planets/" + caption;
VerticalLayout tab = new VerticalLayout();
tab.addComponent(new Image(null,
new ThemeResource(basename + ".jpg")));
accordion.addTab(tab, caption,
new ThemeResource(basename + "_symbol.png"));
}
----
<<figure.accordion.example1>> shows what the example would look like with the
default theme.
[[figure.accordion.example1]]
.An Accordion
image::img/accordion-example1.png[width=40%, scaledwidth=55%]
== CSS Style Rules
[source, css]
----
.v-accordion {}
.v-accordion-item,
.v-accordion-item-open,
.v-accordion-item-first {}
.v-accordion-item-caption {}
.v-caption {}
.v-accordion-item-content {}
.v-scollable {}
----
The top-level element of [classname]#Accordion# has the
[literal]#++v-accordion++# style. An [classname]#Accordion# consists of a
sequence of item elements, each of which has a caption element (the tab) and a
content area element.
The selected item (tab) has also the [literal]#++v-accordion-open++# style. The
content area is not shown for the closed items.
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