JSF commandButton Tag
This section illustrates more
about commandButton tag in JSF. This tag renders an HTML submit
button. This button can be associated with bean. You can perform any
operations at particular event by associating actionListener class for
event handling. You can do any thing with JSF component by the external
resources like showing message from the message bundle and handling form
data after submission the form by backing bean.
This section also providing a
program with complete code which display a command button inside a form.
When you will click on the button, it's action attributes send a value
"page1" to the faces-config.xml file where navigation has been made with
the "page1" value. And the navigation refers the control to the Index
page.
Code Description:
<%@ page contentType="text/html" %>
<%@ taglib uri="http://java.sun.com/jsf/html" prefix="h" %>
<%@ taglib uri="http://java.sun.com/jsf/core" prefix="f" %>
<f:view>
<html>
<head><title>jsf h:commandButton example</title></head>
<body>
<h:form>
<h:commandButton value="Go To Index Page." action="page1" />
</h:form>
</body>
</html>
</f:view> |
Rendered Output:
HTML Source Code:
<html>
<head><title>jsf h:commandButton example</title></head>
<body>
<form id="_id0" method="post" action="/
h-tags/pages/commandButton/commandButton.jsf" enctype="application
/x-www-form-urlencoded">
<input type="submit" name="_id0:_id1" value="Go
To Index Page." />
<input type="hidden" name="_id0" value="_id0" />
</form>
</body>
</html>
|
JSF commandButton tag has some attribute for
different purposes. These attributes are explained below:
- action: This attribute holds a value for
passing values from the page to the faces-config.xml file where the operation
or navigation from the page to another page is decided.
- actionListener: The actionListener attribute
of the commandButton tag is used to assign an action listener method from
backing bean that performs the specific operation.
- id: Value of the attribute is used for
identifying the component uniquely. This attribute must have a unique value in
the closest container.
- immediate:It's value is a boolean
value that indicates for the component events that should be sent to
registered event listeners immediately. The immediate attribute allows you to
turn off validation for a particular component.
- rendered: This attribute takes a boolean
value that indicates for the rendering it or not in the view.
- value: This is the attribute holding the
default value for the component whether it is specified directly or by the
backing bean or any other external resources like message bundle.
- accesskey: This is the html attribute which
specify key by pressing that key the component will be focused and accessed.
- alt: This is also a html attribute that is
used for showing the textual description on mouse over of the component.
- dir: This attribute sets the value which
define the component text direction. It sets the value like "LTR" means
"left-to-right" and "RTL" means "right to left" direction.
- disabled: This attribute takes a boolean
value. If the value is true then the component will be disabled otherwise the
component will be enable.
- image: This attribute takes a relative or
absolute url of the image that has to be displayed on the component. The image
attribute is used for showing image on the component.
- lang: It sets the code for the language to be
used in the markup generated by this component.
- onblur: This attribute indicates the event of
the component. As the value of this attribute is defined as a JavaScript
method which has to be performed when the component loses the focus.
- onchange: Specified JavaScript method is
executed when the value has changed on losing focus after gaining focus.
- onclick: In the attribute, a JavaScript
method is specified that is called when the component is clicked by user.
- ondblclick: This attribute indicates for
performing the specified operation when the component is clicked two times
continuously (or double click).
- onfocus: The JavaScript method can be called
for the component when the component is focused.
- onkeydown: The specified JavaScript method or
operation is performed when the key is pressed down over the component.
- onkeypress: This is the event of the
component. It indicates the key press event. You can call a JavaScript method
on the event of the component whatever you have mentioned.
- onkeyup: The specified JavaScript method is
executed when key is released over this component.
- onmousedown: Specified JavaScript method is
executed when mouse is pressed down over the component or element.
- onmousemove: This attribute sets the
JavaScript code to executed when the mouse pointer is moved within the
component or element.
- onmouseout: This attribute sets the
JavaScript code to execute when the mouse pointer is moved away from the
element or the component.
- onmouseover: This attribute sets the
JavaScript code to execute when the mouse pointer is moved inside the element
or the component.
- onmouseup: This attribute sets the JavaScript
code to executed when the mouse pointer is released from the component.
- onselect: When you select the text contained
by the component or element then the value of the attribute (JavaScript code)
will be executed.
- readonly: This attribute sets the boolean
value for making the component read-only or not.
- style: If you want ot add any CSS with the
component then you can put the style as the value of the attribute. Added CSS
will be applied on for the component.
- styleClass: This attribute holds the CSS
class name which is defined in the external style sheet.
- tabindex: This attribute sets the tab index
for the component. When you press the TAB key then the component will be
focused after focusing all those components whose tab index is less than the
component.
- title: This attribute holds a string value
that is shown as a tool-tip text of a component or element.
- type: This attribute tells the component type
whether it is submit type or reset etc.
- binding: This attribute binds the specified
value with the backing bean.
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