RE: Creating Dynamic h:datatable

[ved.gunjan]

Hi Dhananjay

Thanks for the help....

Presently im doing the way u have suggested...and the sample code which i posted was just for testing purpose.I was only trying to test whether im able to create components from java class or not.

In actual i will be having logic to create the components based on the answer style which comes from the backend (in the if-else block), and the answer style can be of any type,so i may have to create any type of component(component for single answers/component for multiple answer,input and other types).This logic and the approach is clear to me , but im not able to create the data table and its components from the java class.

 

If u could look in to the posted code and suggest where im going wrong then it will be greate.

Hope i have made my requirement clear.

Thanks

ved

Dhananjay Prasanna <[EMAIL PROTECTED]> wrote:

This looks like a very bad idea to me. If there are a limited number of answer component-types (from a quick glance at your code I see htmlSelectMany, One, Boolean) why not just have all those component types and control whether or not they are shown with the “rendered” attribute. Afaic this is the preferred way to dynamically render components.

 

Example in psuedo JSF:

 

<h:dataTable var=”questionAnswerPair” value=”#{qaBean.questionAnswerPairs}”>

   <h:column>

       <%-- Question logic --%>

   </h:column>

   <h:column>

       <component1 … rendered=”#{questionAnswerPair.isRenderComponentType1}”/>

       <component2 … rendered=”#{questionAnswerPair.isRenderComponentType2}”/>

       <component3 … rendered=”#{questionAnswerPair.isRenderComponentType3}”/>

    </h:column>

<h:dataTable>

 

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From: ved.gunjan [mailto:[EMAIL PROTECTED]
Sent: Thursday, 13 July 2006 7:36 AM
To: [EMAIL PROTECTED]; users@myfaces.apache.org
Subject: Creating Dynamic h:datatable

 

Hi Experts,

Here's my requirment....

I'have to display listing of questions and associated answers in the variety of different UIComponents.

These questions and the control type(UIComponent) are not known at the compile time,so i cant create them on the jsp page.

Questions and its associated control type(UIComponent) ,for the answers,are know at the run-time.

So i have to dynamically generate these UIComponent in the <h:datatable or rather to say in other words i've to dynamically create this datatable.

 

Here's my jsp

--------------------

<f:view>

<h:form id="form1">

<h:commandButton value="Create Controls" id="commandButton1" type="submit" action="#{dynamicQuestions.createQuestionControlAction}" />

<h:dataTable binding="#{dynamicQuestions.dataTable}" value="#{requirementBean.questionList}"

var="questions" border="1" id="RootTable" />

</h:form>

</f:view>

-------------------

The java method

 

Application application = FacesContext.getCurrentInstance().getApplication();
            UIViewRoot uiViewRoot =  FacesContext.getCurrentInstance().getViewRoot();
           
            HtmlDataTable dataTable = (HtmlDataTable) application.createComponent(HtmlDataTable.COMPONENT_TYPE);
            dataTable.setVar("questions");
            //dataTable.setValueBinding("binding", (ValueBinding) application.createValueBinding("#{dynamicQuestions.dataTable}"));
            dataTable.setValueBinding("value", (ValueBinding) application.createValueBinding("#{requirementBean.questionList}"));
            dataTable.setId("test_table");
       
            String vbStr = "#{questions.questionData}";
            ValueBinding vb = FacesContext.getCurrentInstance().getApplication().createValueBinding(vbStr);
            HtmlOutputText output = new HtmlOutputText();
            output.setId("HtmlOutputText1");
            output.setValueBinding("value", vb);
       
            vbStr = "#{questions.itemList}";
            vb = FacesContext.getCurrentInstance().getApplication().createValueBinding(vbStr);
       
            HtmlSelectOneMenu hsom = new HtmlSelectOneMenu();
            hsom.setId("HtmlSelectOneMenu2");
            hsom.setValueBinding("value",vb);
       
            vbStr = "#{questions.itemList}";
            vb = FacesContext.getCurrentInstance().getApplication().createValueBinding(vbStr);
       
            HtmlSelectManyListbox hsmlb = new HtmlSelectManyListbox();
            hsmlb.setId("HtmlSelectManyListbox3");
            hsmlb.setValueBinding("value",vb);
       
       
          HtmlSelectBooleanCheckbox chb=new HtmlSelectBooleanCheckbox();
            chb.setId("HtmlSelectBooleanCheckbox4");
            chb.setValueBinding("value", vb);
       
        //datatable column
            UIColumn column = new UIColumn();
            column.setId("UIColumn4");
            column.getChildren().add(output);
            column.getChildren().add(hsom);
            column.getChildren().add(hsmlb);
       
            HtmlOutputText headerComponent = new HtmlOutputText();
            headerComponent.setId("HtmlOutputTextHeader5");
       
            column.setHeader(headerComponent);
            headerComponent.setValue("columnName= 3");
       
          dataTable.getChildren().add(column);
          uiViewRoot.findComponent("form1").getChildren().add(dataTable);
       

 

Right now im trying to only create these UIComponents , just for testing purpose..

HtmlSelectManyListbox ,HtmlSelectOneMenu,HtmlOutputText

 

But when i pressed the CreateControls button nothing happens i.e there is no output.

Please guide me as to where im going wrong and what is the correct way of creating a dynamic datatable.

 

Waiting for the experts reply...

 

Thanks

Ved

 

 

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