getting inputText on only the first row of a (Primefaces) dataTable, with dynamic columns and rows

Question

I have a Primefaces (5.0) Datatable with dynamic columns as well as dynamic rows. In brief, my problem is how do I set it up so that the cells of the first row are a series of i

Answer 1

Thank you again to Unknown: This is effectively your answer (I don't know if there is a more formal way of attributing it to you, but I am happy to do so ). Much appreciated. xhtml code as follows:

<p:dataTable var="rowMap" rowIndexVar="row" value="#{reviewController.rowMapList}"   >
            <p:columns value="#{reviewController.columnNameList[0]}" var="columnName" headerText="#{columnName}">
                                        #{rowMap[columnName]}
                                    </p:columns>
            <p:columns value="#{reviewController.columnNameList}" columnIndexVar="col" rendered="#{col!=0}" var="columnName" headerText="#{columnName}" >
                <f:facet name="header" >#{columnName}</f:facet>
                <h:inputTextarea  value="#{rowMap[columnName]}" rendered="#{row==0}" />
                <h:outputText value="#{rowMap[columnName]}" rendered="#{row!=0}" />
            </p:columns>
        </p:dataTable>  

So it is as you described it for the rows, plus I have added an extra p:columns block just to differentiate the first column, and placed a columnIndexVar with rendered="#{col!=0}" conditional on the main p:Columns block so that the first column does not have the inputTextarea that the other cells of the first row do.

Answer 2

Since you asked you want only the 1st row is editable, I have asked you to use rowIndexVar to manage the rows.

You can use p:dataTable's rowIndexVar attribute.

rowIndexVar is Name of iterator to refer each row index.

Whose iterator name can be used in EL to get the Row Id

For example: if rowIndexVar="row" then you can access each row Index using that iterator name in EL using #{row}.

Example Code:

<p:dataTable rowIndexVar="row" value="..." var="myVar">
    <p:column>
       <p:inputTextarea rows="2" cols="25" counter="display"
                            value="#{myVar.myText}" rendered="#{row==0}"                       id="comment1"
                            maxlength="200"
                            counterTemplate="{0} remaining characters"
                            autoResize="false">
                        </p:inputTextarea>
        <h:outputText value="#{myVar.myText}" rendered="#{row!=0}" />
    </p:column>
    ....
</p:dataTable>