Home Jsf Apache-myfaces-tomahawk Tomahawk inputHidden tag

Tomahawk inputHidden tag
Posted on: March 18, 2008 at 12:00 AM

This tag is used to create the field that is hidden for the user. This is the field that is used to pass the variables from one page to another. It renders the html input element with the type attribute set to "hidden".

Tomahawk inputHidden tag

This tag is used to create the field that is hidden for the user. This is the field that is used to pass the variables from one page to another. It renders the html input element with the type attribute set to "hidden". This component also has the capability to render the id for the component just the same as we have mentioned in the id attribute of the tag. Normally the naming system of JSF renders the id for the component with some additional text, typically with id of the form as prefix. But this component has an attribute forceId which forces the component to render the same id mentioned in the id attribute.

Code Description :

<%@ taglib uri="http://java.sun.com/jsf/html" prefix="h"%>
<%@ taglib uri="http://java.sun.com/jsf/core" prefix="f"%>
<%@ taglib uri="http://myfaces.apache.org/tomahawk" prefix="t"%>

<f:view>
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=iso-8859-1">
<title>t:inputHidden example</title>
</head>
<body ><center>
	<t:inputHidden id="ih" value="Hidden field"/>
</center></body>
</html>
</f:view>

Rendered Output :
The code above creates a hidden field in the page that doesn't appear to the user but is used to pass the value from one page to the other escaping from the users view. We can see the blank figure below :

Html Source Code :

<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=iso-8859-1">
<title>t:inputHidden example</title>
</head>
<body ><center>
	<input type="hidden" id="ih" name="ih" value="Hidden field" />
</center><!-- MYFACES JAVASCRIPT -->
</body>
</html>

This tag contains attributes given below :

id : This is the value which is used to uniquely identify the component within the closest container like form or subview. The main thing to remember is that its value must be a static value.
binding : This attribute is used to specify the property of the backing bean with which this component instance is to be bound.
rendered : Its default value is true. If this attribute is set to true then this component is presented in the page to the user. If false, then this component is not rendered.
value : The initial value of the component is set to this attribute.
converter : This attribute is used to specify the converter for the component.
immediate : This attribute is a boolean attribute that is used to identify the phase during which the value change event should be fired. In normal processing of the event, if immediate attribute is not set to true, the value change event is fired during the invoke application phase but if immediate attribute is set to true then the event is fired at the end of apply request value phase.
required : This is a boolean attribute. If it is set to true then it is necessary for the component to have the value otherwise an error message is rendered to the user for the component.
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. you can change the phase of the life cycle when this method should be fired by the use of immediate attribute discussed above.
forceId : This is a boolean attribute with default value false. If this attribute is set to true, the tag is forced to render the id for the component exactly as mentioned in the id attribute of the tag. The benefit of this attribute is that we can reference component by id in the javascript. If we don't use this attribute with the true value then the id for the component is presented in different format.
forceIdIndex : This is a boolean attribute with default value true. If this value is true then the the component displays the index number in its id value if the component is in a list. If this attribute is set to false then this component will not append index number as suffix . If forcrId is set to false then its value is ignored.

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