JSF selectManyListbox Tag
This section is dedicated to describe you about
selectManyListbox tag. This lets you select more than one options from a set
of available options. It renders an html "select" element of specified
size with "multiple" attribute. size is used to specify how
many options are to be displayed at a time. If size is not specified then it
displays all the choices i.e. its default value is equal to no. of
available options. If we set this size to "1" then drop down list
is rendered. Instead of doing this we can use "selectManyMenu" tag of JSF.
If size is specified less than the total no. of available options then
scroll bar is rendered which can be used to see all the options by moving
it. Options are added by the use of f:selectItem or
f:selectItems.
Code Description :
<%@ taglib uri="http://java.sun.com/jsf/html"
prefix="h"%>
<%@ taglib uri="http://java.sun.com/jsf/core" prefix="f"%>
<f:view>
<html>
<body>
<h:form>
<h:selectManyListbox id="subscriptions" value="#{TableBean.perInfoAll}"
title="select one or more options by pressing the control key" size="3">
<f:selectItem id="si1" itemLabel="Thums Up" itemValue="11" />
<f:selectItem id="si2" itemLabel="Limca" itemValue="22" />
<f:selectItem id="si3" itemLabel="Pepsi" itemValue="33" />
<f:selectItem id="si4" itemLabel="Sprite" itemValue="44" />
<f:selectItem id="si5" itemLabel="Frooti" itemValue="55" />
<f:selectItem id="si6" itemLabel="Coca-Cola" itemValue="66" />
</h:selectManyListbox>
</h:form>
</body>
</html>
</f:view> |
Rendered Output :
Html Source Code:
<html>
<body>
<form id="_id0"
method="post"
action="/htmltag/pages/selectManyListbox.jsf"
enctype="application/x-www-form-urlencoded">
<select id="_id0:subscriptions"
name="_id0:subscriptions"
multiple size="3"
title="select
one or more options by pressing the control key">
<option
value="11">Thums Up</option>
<option value="22">Limca</option>
<option value="33">Pepsi</option>
<option value="44">Sprite</option>
<option value="55">Frooti</option>
<option value="66">Coca-Cola</option>
</select>
<input type="hidden"
name="_id0"
value="_id0"
/>
</form>
</body>
</html> |
This tag can use some attributes that are
useful in different places for different purpose. Here is the list of attributes
:
- id : This attribute is used to uniquely
identify the element within the closest container.
- size : It is used to determine how many
options have to be shown at a time from the list of available options. If it
is not specified then all are shown. If size is set to less than the number of
available options then scroll bar is rendered.
- enabledClass : This attribute is used to set
the CSS class to the label of disabled choices.
- disabledClass : This attribute is used to set
the CSS class to the label of enabled choices.
- binding : It takes the value binding
expression that is used to link the component to the property of the backing
bean.
- rendered : Its a boolean attribute. Its
default value is true. It determines whether this component should be rendered
or not.
- value : This is to set the current value of
the component.
- converter : This specifies the converter for
the component. This can be static value or EL expression .
- immediate : Its a boolean attribute. It is
used to identify during which phase value change event should occur. If this
attribute is set to true then in place of firing the event during the process
validation phase, these event are sent immadiately at the end of apply request
values phase.
- required : Its a boolean attribute. It
indicates that its value is required by the user before the submission of the
form to the server. If it is set to true and value is not provided then an
error message comes.
- validator : It takes the method binding
expression. This expression represents the validator method. This method is
called at the time of validation of the component.
- valueChangeListener : This also takes a
method binding expression. This expression represents value change listener
method. This method will be called when new value is set for this component.
- dir : It is used to set the direction of the
text to be displayed. It can take two values LTR(left to right) and RTL (right
to left).
- lang : It is used to set the base language of
the component when displayed.
- style : It is used to set the CSS style
definition for the component.
- title : It is the standard html attribute.It
is used to set the tooltip text for this component.
- styleClass : It is used to set the CSS class
for the component.
- onclick : Script to be invoked when the
element is clicked.
- ondblclick : It is used for Java Script code
to be invoked when the element is double-clicked.
- onmousedown : It is used for Java Script code
to be invoked when the pointing device is pressed over this element.
- onmouseup : It is used for Java Script code
to be invoked when the pointing device is released over this element.
- onmouseover : It is used for Java Script code
to be invoked when the pointing device is moved into this element.
- onmousemove : It is used for Java Script code
to be invoked when the pointing device is moved while it is in this element.
- onmouseout : It is used for Java Script code
to be invoked when the pointing device is moves out of this element.
- onkeypress : It is used for Java Script code
to be invoked when a key is pressed over this element.
- onkeydown : It is used for Java Script code
to be invoked when a key is pressed down over this element.
- onkeyup : It is used for Java Script code to
be invoked when a key is released over this element.
- accesskey : This is standard html attribute.
It is used to set the access key for the element which is used to send the
focus to the element when pressed.
- disabled : Its a boolean attribute. This is
used to disable the element to receive focus, when it is set to true.
- onblur : It is used to set the java script
code to execute when focus is lost from the element.
- onfocus : It is used to set the java script
code to execute when focus is received by the element.
- onchange : It is used to set the java script
code to execute when element is modified.
- onselect : It is used to set the java script
code to execute when element is modified
- readonly : Its a boolean attribute. It is
used to indicate the user that its value can't be modified, if it is set to
true.
- tabindex : This is a standard html attribute.
It is used to set the order of receiving the focus on the movement of TAB key
by the user.
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