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marți, 24 februarie 2015

[JSF Page Author Beginner's Guide] JSF <inputTextarea> / HTML5 <textarea> element

The <h:inputTextarea> renders an HTML "textarea" element
Common/basic usage in JSF:

<?xml version='1.0' encoding='UTF-8' ?>
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml"
      xmlns:pt="http://xmlns.jcp.org/jsf/passthrough"       
      xmlns:h="http://xmlns.jcp.org/jsf/html">
 <h:head>
  <title>JSF inputTextarea examples</title>        
 </h:head>
 <h:body>
  <h:form>          
   Text: <h:inputTextarea cols="30" rows="5" value="#{playerBean.text}" />           
   <h:commandButton value="Send" action="data"/>
  </h:form>
 </h:body>
</html>

The <h:inputTextarea> will be rendered in HTML as:

<textarea name="j_idt6:j_idt8" cols="30" rows="5"></textarea>

The PlayerBean will be:

package beans;

import java.io.Serializable;
import javax.enterprise.context.SessionScoped;
import javax.inject.Named;

@Named
@SessionScoped
public class PlayerBean implements Serializable{
   
 private String text;

 public String getText() {
  return text;
 }

 public void setText(String text) {
  this.text = text;
 }           
}

And the data.xhtml page simply display the user inputs:

<?xml version='1.0' encoding='UTF-8' ?>
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml"    
      xmlns:h="http://xmlns.jcp.org/jsf/html">
 <h:head>
  <title></title>        
 </h:head>
 <h:body>
  <!-- View submitted data -->           
  Text: <h:outputText value="#{playerBean.text}"/>                     
 </h:body>
</html>

Data flow in image:
More examples:

Add xmlns:pt="http://xmlns.jcp.org/jsf/passthrough" for pass-through attributes

Style textarea with CSS class
            
<h:form>          
 Text: <h:inputTextarea cols="30" rows="5" value="#{playerBean.text}" styleClass="textarea" />           
 <h:commandButton value="Send" action="data"/>
</h:form>

<!-- Style textarea with inline CSS -->           
<h:form>          
 Text: <h:inputTextarea cols="30" rows="5" value="#{playerBean.text}" 
         style=" background-color: graytext; color: greenyellow;" />           
 <h:commandButton value="Send" action="data"/>
</h:form>

Preset the text value via the bean's (post) constructor

<h:form>          
 Text: <h:inputTextarea cols="30" rows="5" value="#{playerBean.text}"/>           
 <h:commandButton value="Send" action="data"/>
</h:form>

And place initialization in the bean constructor:

@Named
@SessionScoped
public class PlayerBean implements Serializable {
 ...
 public PlayerBean() {
  text= "Roger Federer";
 }
 ...
}

Or in post constructor (this is useful if you need to perform initialization based on some injected artifacts):

@Named
@SessionScoped
public class PlayerBean implements Serializable {

 @Inject
 private SelectedPlayerBean selectedPlayerBean; 
 ...
 @PostConstruct
 public void init() {
  text = selectedPlayerBean.getPlayer();
 }
...
}

Keep in mind that constructor (and post constructor) are invoked at each request in case of request scoped beans, so initialization will take place at each request ! This kind of initialization is commonly useful in view/session scoped beans where constructor (and post constructor) are invoked per view/session.

Make a required textarea via JSF (see below via HTML 5)

<h:form>          
 Text: <h:inputTextarea cols="30" rows="5" value="#{playerBean.text}" required="true"      requiredMessage="Please, enter some text!"/>           
 <h:commandButton value="Send" action="data"/>
</h:form>

Make a required textarea via HTML 5, required attribute

<!-- for any case add JSF attribute required="true" also -->    
<h:form>          
 Text: <h:inputTextarea cols="30" rows="5" value="#{playerBean.text}" 
          pt:required="true" required="true" requiredMessage="Please, enter some text!"/>           
 <h:commandButton value="Send" action="data"/>
</h:form>

Make a textarea with autofocus via HTML 5, autofocus attribute

<h:form>          
 Text: <h:inputTextarea cols="30" rows="5" value="#{playerBean.text}" pt:autofocus="true"/>           
 <h:commandButton value="Send" action="data"/>
</h:form>

Make a textarea with max length via HTML 5, maxlength attribute (e.g. 10 characters)

<h:form>          
 Text: <h:inputTextarea cols="30" rows="5" value="#{playerBean.text}" pt:maxlength="10"/>           
 <h:commandButton value="Send" action="data"/>
</h:form>

Make a textarea with placeholder via HTML 5 placeholder attribute

<h:form>          
 Text: <h:inputTextarea cols="30" rows="5" value="#{playerBean.text}" pt:placeholder="Type some text here"/>           
 <h:commandButton value="Send" action="data"/>
</h:form>

Make a textarea with wrapped text via HTML 5 wrap attribute

<h:form>          
 Text: <h:inputTextarea cols="30" rows="5" value="#{playerBean.text}" pt:wrap="hard"/>            
 <h:commandButton value="Send" action="data"/>
</h:form>
<!-- you can switch to pt:wrap="soft" and check the POST request via Firebug to see the 'wrap' effect -->

Complete source code on GitHub.
See also Mkyong.com.
More resources on Constantin Alin, ZEEF page.
Textarea in JSF Extension on JSF ShowCase ZEEF page.

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