JSF UISelectItems HtmlSelectOneListbox binding value TimeZones

Question

(note: I subclassed jakarta.faces.component.UISelectItem and overridden toString, but for now the code below is effectively identical although i will be in future , removing the object search and simply obtaining the value from "listbox" , also be placing an array in init and make static for session bean) I created a JSF session bean with jakarta.faces-3.0.0-RC5.jar and apache-tomcat-10.0.12 using HtmlSelectOneListbox to show all TimeZone choices (It Works!) , but i find there is very little scope for the initial code infrastructure to work with because some components don't appear to have a pattern of creating them for using them that operates with UISelectItems (plural the wrapper of UIselectItem). Eventually i found some advice on the net that a class with interface java.util.Map can be placed into setValue of UISelectItems ,but placing an array of UISelectItem[] into UISelectItems does not operate! Neither does jakarta.faces.model.SelectItem[] get placed into UISelectItems but is put in a "group" that from API docs is a mystery to me how. I found from the API doc , to create a suitable array for UISelectItems requires five particular methods must be used compulsory successfully upon UISelectItem to place into UISelectItems (That finally got it operating). How is a jakarta.faces.model.SelectItem placed into anything for "binding" given that if it is in a group or the group can somehow be specified somewhere. Too, it took me some time to realize there was a system to create the html "option values" and setItemValue with setValue used on UISelectItem allows the server to store a proper matching index of values sent and recieved K,V

I know what binding is and I know what binding does, I just did that! (Also in 2010) but...some nice references to other JSF material. How does the 'binding' attribute work in JSF? When and how should it be used? This following is extremely helpful but not much of the problem as it does not use binding in f:selectItems. JSF-2 f:selectItems with Map does not display itemLabel

The following is used for "value=" with f:selectItems and is wrong for use in "binding"! itemLabel method is a compulsory on UIComponent How to populate options of h:selectOneMenu from database? Another recommended uses richfaces not jakarta

This is part of the interesting creature, this extends Object in Jakarta API docs jakarta.faces.model.SelectItem but cannot find a suitable alike to f:selectItems in either API or tag! Also the mimmick for optgroup labelling tag is another difficulty to find anything about in model or jakarta.faces.component.html In DHTML and HTML a "select" tag does not require any option or optgroup(if supported) tags because they can all be inserted in page and managed dynamically, hence a UISelectOneListbox(or other classes produce "select") will render without any nested tags although it has a body tag processor for nested tags

Someone wanted to see the XHTML page SOURCE





    
 





PAGE TITLE




 
     
            
            



The HttpOutputTools (----------------- "-------------------") Java Jar project




   




    
    
        
    

    
 



 














 The HttpOutputTools (------------- "------------") Java Jar project
 
[ Quick note REMEMBER THIS : In a nutshell 99.999r percent of all method calls in code when using the package should be from an interface, classes are only ever directly instantiated from the package if one of three server application scope server memory stored classes are constructed for loading at application init (names ending with 'Obj' that after retrieval with getAttribute() from the server should be cast to / received on an identifier as an interface) or it is the one special class to obtain the Interface 'Tool', the interface used to obtain almost all other interfaces ]

The HttpOutputTools projects started as a java web server file read/write output mechanism to assist lowering repetitive server side coding overhead of extremely common segments of tasks and being able to setup read (from file) / writes (to output) for tunable conservation of RAM space, particularly for small RAM allocation java servers such as in hosting plans.

Because many tasks of web server JSP,JSF or Servlet/Web Sevice use code that is repeated but often does require some severe modification for purpose, other library parts were added to build a set of common but short methods to lower repeated method call usage to produce these small common sub parts that occur, too, these methods often require other SE core library classes, resulting requirement for these classes to be used and callable in this package. These were added to the package by method calls to obtain and instantiate and use from the one (or as few as possible) coding identifier in the package rather than completely requiring to set up classes from import statements and instantiation.

Any reputable or J2EE Java Web Server contains a system to hold in memory special instantiated object classes instaniated at application startup that are obtained from the ServletContext or ApplicationContext. Some of the classes in the package are for use running stored in memory of the Web Server while the application is "on"(running), (However, a side note to this, all classes are Java SE core in the HTToutPutTools package and can be used in a desktop application or anywhere SE Core is used if wanted).

The jar package of classes includes:


Hold commonly served documents or images (binary or B64) in memory either permanent or dynamically avoiding file handling.
Read files by "byte" in a small chunk section with self closing either for direct output or encrypted to Base 64 String.
Assess memory usage to assist preventing overrun during heavy server loading to custom trigger the JVM GC if required.
Help code internationalized java.time and form programs doing less coding and some web server relevant time pattern formats for UTC headers.
Text and time internationalization and Locale language testing with encodings, also a vast array of many HTML/XML entities.
Create and manage Cookies for server or page javascript.
Web server header commands list and special characters array for internationalization , header and script or cookies encoding.
Lower coding overhead of web server encoding schemes.
Binary search of byte literals, or byte literals of Strings in file , or with an Ignore Case version.
Storing special custom text "information" dynamically in server memory.
Quickly create or append to files e.g. temp files.



Link: HttpOutPutTools Tutorial     Link: HttpOutPutTools API Jar Documentation     Link: HttpOutPutTools Sources Download

This is what i did and appear the only way to bind to the XHTML tag in page.


package beans;

import jakarta.faces.bean.ManagedBean;
//import jakarta.faces.bean.RequestScoped;
import jakarta.faces.bean.SessionScoped;
import jakarta.servlet.ServletContext;
import com.nicephotog.tools.*;
import com.nicephotog.tools.objectattribute.WebAppToolAPIconstantsObj;
import com.nicephotog.tools.wwwtimeifc.WebSqlTimeVar;
import java.util.Locale;

/*
SelOneLiBox.java completed 5th Oct 2023

JSF SelectOneListBox and UISelectItems binding

jakarta.faces-3.0.0-RC5.jar   apache-tomcat-10.0.12   "nicephotog-web-tools.jar unreleased - Oct 5th 2023"
 */



/**
 *
 * @author samuel A Marchant nicephotog@gmail.com
 */
@ManagedBean
@SessionScoped
public class SelOneLiBox{
 
public jakarta.faces.component.html.HtmlSelectOneListbox listbox=null;
public jakarta.faces.component.UISelectItems useli=null;
public java.util.Map uiselsB=null;

public String currenttimeworldzone="Australia/ACT";
public String worldtime="none"; 


/*
The best i guess for doing this way is becausethe following require escaping into an XHTML (XML) document
because the ZoneId value String has a forward slash symbol in it . so illegal in xml (nb escaped is false in this)
uiiyinp.setItemValue(pack[pk]);
uiiyinp.setValue(pack[pk]);
*/
public String findZoneObj(){
    String tzfound="";
java.util.Set kys =uiselsB.keySet();
java.util.Iterator io = kys.iterator();   
jakarta.faces.component.UISelectItem si = new jakarta.faces.component.UISelectItem();
String ishsh ="";
   boolean stp=false;
while((io.hasNext()==true) && (stp==false)){ 
    si=uiselsB.get(io.next()); 
    ishsh =si.toString();
if(ishsh.indexOf(currenttimeworldzone)!=-1){
//setCurrentTimeWorldZone(si.getItemLabel());
tzfound=si.getItemLabel();
stp=true;
}
}//enwhl
return (tzfound);
}//enmeth


public void setCurrentTimeWorldZone(String currentTimeWorldZone){ // setoption    
this.currenttimeworldzone=currentTimeWorldZone;
}   

public String getCurrentTimeWorldZone(){ // setoption
return currenttimeworldzone;
}


public jakarta.faces.component.UISelectItems getSeLits(){ // setoption
return useli;
}

public void setSeLits(jakarta.faces.component.UISelectItems useli){
this.useli=useli;
}
   
public void setListBox(jakarta.faces.component.html.HtmlSelectOneListbox listbox){
if(listbox!=null){}else{
this.listbox=makelistbox();
}
this.listbox=listbox;
}  
 
// NOTE encodeBegin e.t.c. methods are for outputing in a servlet string dynamically with a reference to the Faces servlet dynamically
public jakarta.faces.component.html.HtmlSelectOneListbox getListBox(){ // for h:text
if(listbox!=null){
listbox.saveState(jakarta.faces.context.FacesContext.getCurrentInstance());
}else{
this.listbox=makelistbox();
}
return listbox;   
}



public jakarta.faces.component.UISelectItem makeSel(String pack,int pk){
jakarta.faces.component.UISelectItem uiiyinp = new jakarta.faces.component.UISelectItem();
uiiyinp.setItemDescription("World zone ID choice "+pk);
uiiyinp.setItemLabel(pack);
uiiyinp.setItemDisabled(false);
uiiyinp.setItemEscaped(false);
uiiyinp.setItemValue(pack);
uiiyinp.setValue(pack);
uiiyinp.setRendered(true);
return (uiiyinp);
} 

public jakarta.faces.component.html.HtmlSelectOneListbox makelistbox(){ // for h:text
listbox = new jakarta.faces.component.html.HtmlSelectOneListbox();

String[] pack = obtainZoneIDarray();
int pck = pack.length;

uiselsB = new java.util.LinkedHashMap();

jakarta.faces.component.UISelectItem buiiyinp = new jakarta.faces.component.UISelectItem();

for(int pk=0;pk";
    try{
Tool tl = new ToolWww().getWwwTool();
WebSqlTimeVar wbsqtm = tl.getTimeStampPodNow();
wbsqtm.setThisZoneidObj(java.time.ZoneId.of(tz));
tm += "JSF ListBox : "+wbsqtm .getDayOfWeek(Locale.US)+" "+wbsqtm.getYYYYMMDD(true)+" "+wbsqtm.getHHMMSS()+" "+tz+" ";
    }catch(Exception ecx){
    System.out.println("Error in JSF bean WorldTimeBean getWorldTime()");
    }
worldtime=tm;
 return worldtime;   
}

    
}//enclss

This is the XHTML page somewhat expigated










PAGE TITLE


            
            



The HttpOutputTools (----------------- "-------------------") Java Jar project








JSF ListBox : Friday 2023-10-06 13:08:39 Australia/ACT  














 The HttpOutputTools (------------- "------------") Java Jar project

JSF UISelectItems HtmlSelectOneListbox binding value TimeZones

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