--- title: Button order: 14 layout: page --- [[components.button]] = Button ifdef::web[] [.sampler] image:{live-demo-image}[alt="Live Demo", link="http://demo.vaadin.com/sampler/#ui/interaction/button"] endif::web[] The [classname]#Button# component is normally used for initiating some action, such as finalizing input in forms. When the user clicks a button, a [classname]#Button.ClickEvent# is fired, which can be handled by adding a __click listener__ using either the [methodname]#onClick()# or the [methodname]#addClickListener()# method. [[figure.component.button.basic]] .A [classname]#Button# image::img/button-example1.png[width=35%, scaledwidth=60%] You can handle button clicks most easily with an anonymous class or a lambda expression, as follows: [source, java] ---- Button button = new Button("Do not press this button"); button.addClickListener(clickEvent -> Notification.show("Do not press this button again")); ---- The listener can also be given in the constructor, which is often perhaps simpler. == CSS Style Rules [source, css] ---- .v-button { } .v-button-wrap { } .v-button-caption { } ---- A button has an overall [literal]#++v-button++# style. The caption has [literal]#++v-button-caption++# style. There is also an intermediate wrap element, which may help in styling in some cases. The button component has many style variants in the Valo theme, as illustrated in <>. The styles are defined in the [classname]#ValoTheme# class. [[figure.component.button.valostyles]] .Button in different styles of the Valo theme image::img/button-valo-styles.png[width=70%, scaledwidth=100%] lue='Fix/mp3_regex'>Fix/mp3_regex Nextcloud server, a safe home for all your data: https://github.com/nextcloud/serverwww-data
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