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java:addingcomponentsprogramatically [2012/11/07 23:05] – rlunarojava:addingcomponentsprogramatically [2022/12/02 21:02] (current) – external edit 127.0.0.1
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 +====== Adding JSF components programmatically ======
 +
 +I've had to search a lot through internet in order to discover how to create JSF components programmaticaly. At the end, I didn't have to use it in the application I was creating, but I thought it worth to keep the research in some way. 
 +
 +<code java>
 +
 +
 +import javax.faces.application.Application;
 +import javax.faces.component.html.*;
 +import javax.faces.context.FacesContext;
 +
 +import com.rapidoaudit.model.AuditSkel;
 +
 +
 +public class SectionsCollection
 +{
 + // rendered panel
 + private HtmlPanelGrid grid = null; 
 + //private List<UIComponent> sections;
 + private int sectionsCounter; 
 +
 + public borrado_20110603_SectionsCollection()
 + {
 + sectionsCounter = 0; 
 + //sections = new ArrayList<UIComponent>();
 + }
 +
 + public void setComponent( HtmlPanelGrid newGrid )
 + {
 + grid = newGrid;
 + }
 +
 + public HtmlPanelGrid getComponent()
 + {
 + Application app =  FacesContext.getCurrentInstance().getApplication();
 +
 + grid = (HtmlPanelGrid) app.createComponent(HtmlPanelGrid.COMPONENT_TYPE);
 + grid.setColumns(1);
 + grid.setId("sections");
 +
 + return grid;
 + }
 +
 + public void addSection(AuditSkel skel)
 + {
 +
 + Section s1;
 +
 + skel.addSection();
 +
 + s1 = new Section(skel, sectionsCounter);
 +
 + grid.getChildren().add( s1.getGrid() );
 +
 + sectionsCounter++; 
 +
 + } // addSection
 +
 +}
 +
 +
 +</code>
 +
 +
 +<code java>
 +package com.rapidoaudit.view;
 +
 +import javax.el.ELContext;
 +import javax.el.ValueExpression;
 +import javax.faces.application.Application;
 +import javax.faces.component.UIComponent;
 +import javax.faces.component.UIInput;
 +import javax.faces.component.UISelectItem;
 +import javax.faces.component.html.HtmlInputText;
 +import javax.faces.component.html.HtmlOutputLabel;
 +import javax.faces.component.html.HtmlOutputText;
 +import javax.faces.component.html.HtmlPanelGrid;
 +import javax.faces.component.html.HtmlPanelGroup;
 +import javax.faces.component.html.HtmlSelectOneMenu;
 +import javax.faces.component.html.HtmlSelectBooleanCheckbox;
 +import javax.faces.context.FacesContext;
 +import javax.faces.convert.IntegerConverter;
 +
 +import com.rapidoaudit.model.AuditSkel;
 +
 +import java.util.Random; 
 +import org.primefaces.component.spinner.Spinner;
 +
 +public class Section 
 +{
 +
 + int sectNumber; 
 +
 + // rendered panel
 + private HtmlPanelGrid grid = null; 
 +
 + public Section( AuditSkel newSkel, int newSectNumber ) 
 + {
 + sectNumber = newSectNumber; 
 + }
 +
 + public Section()
 + {
 + Random rnd = new Random(); 
 +  
 + sectNumber = rnd.nextInt( 200000 ); 
 + }
 +
 + public Section( int intSectNumber )
 + {
 + sectNumber = intSectNumber;
 + }
 +
 +
 + // for setting unique id's in the view
 + private void compSetId( UIComponent comp, String id )
 + {
 + comp.setId( id + new Integer(sectNumber).toString() ); 
 + }
 +
 + // for setting unique id's in the view
 + @SuppressWarnings("unused")
 + private void compSetId( UIComponent comp )
 + {
 + // create a random stream of numbers (just for the sake of keep faces happy)
 + Random rnd = new Random();
 +
 + comp.setId( Integer.toString(rnd.nextInt(200000)));
 + }
 +
 + /**
 + * To set a value from an Expression Language expression. 
 + * Example:
 + * 
 + * compSetValue( name_input, "#{auditSkel.name}" );
 + * 
 + * where "auditSkel" should be an existent bean
 + * 
 + * @param comp
 + * @param elExpression
 + */
 + private void compSetValue( UIInput comp, String elExpression )
 + {
 + ELContext elContext = FacesContext.getCurrentInstance().getELContext();
 +
 + ValueExpression val1 = FacesContext.getCurrentInstance().
 +     getApplication().
 +     getExpressionFactory().
 +     createValueExpression( elContext,
 +     elExpression,
 +     Object.class);
 + comp.setValueExpression( "value", val1 );
 +
 + } // compSetValue
 +
 +
 + public HtmlPanelGrid getGrid( )
 + {
 + if( grid == null )
 + {
 + Application app = FacesContext.getCurrentInstance().getApplication();
 +
 + grid = (HtmlPanelGrid) app.createComponent(HtmlPanelGrid.COMPONENT_TYPE);
 +
 + grid.setColumns(2);
 + compSetId( grid, "Section" ); 
 +
 + // <h:outputLabel for="name" value="Name" styleClass="right"/>
 + HtmlOutputLabel name_label = (HtmlOutputLabel) app.createComponent(HtmlOutputLabel.COMPONENT_TYPE);
 + name_label.setStyleClass("right");
 + name_label.setValue("Name");
 + name_label.setFor("type");
 + compSetId( name_label, "name_label" );
 + grid.getChildren().add(name_label);
 +
 + // <h:inputText id="name" value="Put a name here"/>
 + HtmlInputText name_input = (HtmlInputText) app.createComponent(HtmlInputText.COMPONENT_TYPE);
 + compSetId( name_input, "name_input" );
 + // aqui me quedo, no sé cómo se puede hacer esto
 + //compSetValue( name_input, "#{auditSkel.getSection("+ sectNumber +").name}" );
 + compSetValue( name_input, "#{testProp.testObject(1).name}" ); 
 + grid.getChildren().add(name_input);
 +
 + //<h:outputLabel for="type" value="Type" styleClass="right"/>
 + HtmlOutputLabel type_label = (HtmlOutputLabel) app.createComponent(HtmlOutputLabel.COMPONENT_TYPE); 
 + type_label.setStyleClass("right");
 + type_label.setValue("Type");
 + type_label.setFor("type");
 + compSetId( type_label, "type_label" );
 + grid.getChildren().add(type_label); 
 +
 + //<h:selectOneMenu id="type" value="text_many">
 + // <f:selectItem itemLabel="Text" itemValue="text_many"/>
 + // <f:selectItem itemLabel="Date" itemValue="date"/>
 + // <f:selectItem itemLabel="Text (one line)" itemValue="text_one"/>
 + // <f:selectItem itemLabel="Document" itemValue="file"/>
 + // <f:selectItem itemLabel="Image" itemvalue="image"/>
 + //</h:selectOneMenu>
 + HtmlSelectOneMenu type_menu = (HtmlSelectOneMenu) app.createComponent(HtmlSelectOneMenu.COMPONENT_TYPE);
 + compSetId( type_menu, "type_menu" ); 
 + type_menu.setValue("text_many");
 +
 + UISelectItem type_item_1 = (UISelectItem) app.createComponent(UISelectItem.COMPONENT_TYPE);
 + type_item_1.setItemLabel("Text (many lines)");
 + type_item_1.setItemValue("text_many");
 + compSetId( type_item_1, "type_item_1" );
 + type_menu.getChildren().add(type_item_1);
 +
 + UISelectItem type_item_2 = (UISelectItem) app.createComponent(UISelectItem.COMPONENT_TYPE); 
 + type_item_2.setItemLabel("Date");
 + type_item_2.setItemValue("date");
 + type_item_2.setId("type_item_2"); 
 + compSetId( type_item_2, "type_item_2" );
 + type_menu.getChildren().add(type_item_2);
 +
 + UISelectItem type_item_3 = (UISelectItem) app.createComponent(UISelectItem.COMPONENT_TYPE); 
 + type_item_3.setItemLabel("Text (one line)");
 + type_item_3.setItemValue("text_one");
 + compSetId( type_item_3, "type_item_3"); 
 + type_menu.getChildren().add(type_item_3);
 +
 + UISelectItem type_item_4 = (UISelectItem) app.createComponent(UISelectItem.COMPONENT_TYPE); 
 + type_item_4.setItemLabel("Document");
 + type_item_4.setItemValue("file");
 + compSetId( type_item_4, "type_item_4"); 
 + type_menu.getChildren().add(type_item_4);
 +
 + UISelectItem type_item_5 = (UISelectItem) app.createComponent(UISelectItem.COMPONENT_TYPE); 
 + type_item_5.setItemLabel("Image");
 + type_item_5.setItemValue("image");
 + compSetId( type_item_5, "type_item_5"); 
 + type_menu.getChildren().add(type_item_5);
 +
 + grid.getChildren().add(type_menu);
 +
 + //<h:outputLabel for="goesReport" value="Does this section appear on the report?" styleClass="right"/>
 + HtmlOutputLabel goesReportLabel = (HtmlOutputLabel) app.createComponent(HtmlOutputLabel.COMPONENT_TYPE); 
 + goesReportLabel.setStyleClass("right");
 + goesReportLabel.setValue("Does this section appear on the report?");
 + goesReportLabel.setFor("type");
 + compSetId( goesReportLabel, "goesReportLabel" );
 + grid.getChildren().add(goesReportLabel); 
 +
 + //<h:selectBooleanCheckbox id="goesReport"/>
 + HtmlSelectBooleanCheckbox goesReport = (HtmlSelectBooleanCheckbox) app.createComponent(HtmlSelectBooleanCheckbox.COMPONENT_TYPE);
 + compSetId( goesReport, "goesReport" );
 + grid.getChildren().add(goesReport); 
 +
 + //<h:outputLabel for="isFinding" value="Is this section part of a finding?" styleClass="right"/>
 + HtmlOutputLabel isFindingLabel = (HtmlOutputLabel) app.createComponent(HtmlOutputLabel.COMPONENT_TYPE); 
 + isFindingLabel.setStyleClass("right");
 + isFindingLabel.setValue("Is this section part of a finding?"); 
 + isFindingLabel.setFor("isFinding" );
 + compSetId( isFindingLabel, "isFindingLabel" ); 
 + grid.getChildren().add(isFindingLabel); 
 +
 + //<h:selectBooleanCheckbox id="isFinding"/>
 + HtmlSelectBooleanCheckbox isFinding = (HtmlSelectBooleanCheckbox) app.createComponent(HtmlSelectBooleanCheckbox.COMPONENT_TYPE);
 + compSetId( isFinding, "isFinding" );
 + grid.getChildren().add(isFinding); 
 +
 + //<h:outputText value="In each audit work this will appear..."/>
 + HtmlOutputText minimumMaximum = (HtmlOutputText) app.createComponent( HtmlOutputText.COMPONENT_TYPE );
 + compSetId( minimumMaximum, "minimumMaximum" );
 + minimumMaximum.setValue("In each audit work this will appear...");
 + minimumMaximum.setStyleClass("right");
 + grid.getChildren().add(minimumMaximum);
 +
 + HtmlOutputLabel empty1 = (HtmlOutputLabel) app.createComponent( HtmlOutputLabel.COMPONENT_TYPE );
 + compSetId( empty1, "empty1" );
 + empty1.setValue("");
 + grid.getChildren().add(empty1);
 +
 + //<h:panelGrid/>
 +
 + //<h:outputLabel for="minima" value="...a minimum of" styleClass="right"/>
 + HtmlOutputLabel aMinimumOf = (HtmlOutputLabel) app.createComponent(HtmlOutputLabel.COMPONENT_TYPE);
 + compSetId(aMinimumOf, "aMinimumOf"); 
 + aMinimumOf.setValue("A minimum of" ); 
 + aMinimumOf.setStyleClass("right"); 
 + aMinimumOf.setFor("panelMin");
 + grid.getChildren().add(aMinimumOf);
 +
 + //<h:panelGroup>
 + HtmlPanelGroup panelMin = (HtmlPanelGroup) app.createComponent(HtmlPanelGroup.COMPONENT_TYPE);
 + compSetId(panelMin, "panelMin");
 +
 + // <p:spinner id="minima" value="1" min="0" max="1000"/>
 + Spinner spMin = (Spinner) app.createComponent( Spinner.COMPONENT_TYPE ); 
 + compSetId( spMin, "spMin" ); 
 + spMin.setValue(1); 
 + spMin.setMin(0); 
 + spMin.setSize(5);
 + spMin.setMax(1000);
 + spMin.setConverter(new IntegerConverter());
 + panelMin.getChildren().add(spMin);
 +
 + // <h:outputText value="times"/>
 + HtmlOutputText times = (HtmlOutputText) app.createComponent(HtmlOutputText.COMPONENT_TYPE);
 + compSetId( times, "times" ); 
 + times.setValue("times");
 + panelMin.getChildren().add(times); 
 +
 + //</h:panelGroup>
 + grid.getChildren().add(panelMin); 
 +
 +
 + //<h:outputLabel for="maximum" value="...a maximum of" styleClass="right"/>
 + HtmlOutputLabel aMaximumOf = (HtmlOutputLabel) app.createComponent(HtmlOutputLabel.COMPONENT_TYPE);
 + compSetId(aMaximumOf, "aMaximumOf"); 
 + aMaximumOf.setValue("A maximum of" ); 
 + aMaximumOf.setStyleClass("right"); 
 + aMaximumOf.setFor("panelMin");
 + grid.getChildren().add(aMaximumOf);
 +
 + //<h:panelGroup>
 + HtmlPanelGroup panelMax = (HtmlPanelGroup) app.createComponent(HtmlPanelGroup.COMPONENT_TYPE);
 + compSetId(panelMax, "panelMax");
 +
 + // <p:spinner id="maximum" value="1"/>
 + Spinner spMax = (Spinner) app.createComponent( Spinner.COMPONENT_TYPE ); 
 + compSetId( spMax, "spMax" ); 
 + spMax.setValue(1); 
 + spMax.setMin(0); 
 + spMax.setSize(5);
 + spMax.setMax(1000);
 + spMax.setValue(0);
 + spMax.setConverter(new IntegerConverter());
 + panelMax.getChildren().add(spMax);
 +
 + // <h:outputText value="times"/>
 + HtmlOutputText times2 = (HtmlOutputText) app.createComponent(HtmlOutputText.COMPONENT_TYPE);
 + compSetId( times2, "times2" ); 
 + times2.setValue("times");
 + panelMax.getChildren().add(times2); 
 +
 + // </h:panelGroup>
 + grid.getChildren().add(panelMax); 
 +
 + //</h:panelGrid>
 +
 + }
 +
 + return grid;
 + }
 +
 +}
 +
 +</code>
 +
 +~~DISQUS~~
 +
 +