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JSF selectOneListbox Tag

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This section describes you about selectOneListbox tag in detail. This is used when you have to allow the user to select only one option from the list.

JSF selectOneListbox Tag

        

This section describes you about selectOneListbox tag in detail. This is used when you have to allow the user to select only one option from the list. Actually it renders an html "select" element of any size and no "multiple" attribute. The choices that we have to display in the list are shown by  f:selectItem or f:selectItems. size attribute is used to set the number of options to display at a time.  If its size is not specified then it shows all the choices i.e. its default size is equal to no. of available options. If we set size attribute to less than the total no. of available choices then a scrollbar appears and the number of elements specified in the size attribute are shown. We can see other options by moving the scrollbar down and up. If size is set to "1" then drop down menu is rendered. So instead of using this strategy, its good to use "selentOneMenu" tag provided by JSF.

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:selectOneListbox id="sol" value="TableBean.perInfoAll" size="3" title="select one option">
<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:selectOneListbox>
   </h:form>
  </body>
 </html>
</f:view>

Rendered Output :

Html Source Code:

<html>
   <body>
   <form id="_id0" method="post"   action="/htmltag/pages/selectOneListbox.jsf" enctype="application/x-www-form-urlencoded">
 <select id="_id0:sol" name="_id0:sol" size="3" title="select one option">
   <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 contains some attributes that can be used for different purposes. These attributes are summarized below :

  • 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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Posted on: June 13, 2007

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