<?xml version="1.0" encoding="UTF-8"?>
<section>
          <sectioninfo>
                    <keywordset>
                              <keyword>rich:columns</keyword>
                              <keyword>columns</keyword>
                    </keywordset>
          </sectioninfo>
          <table>
                    <title>Component identification parameters</title>

                    <tgroup cols="2">
                              <thead>
                                        <row>
                                                  <entry>Name</entry>
                                                  <entry>Value</entry>
                                        </row>
                              </thead>
                              <tbody>
                                        <row>
                                                  <entry>component-type</entry>
                                                  <entry>org.richfaces.Column</entry>
                                        </row>
                                        <!--row>
					<entry>component-class</entry>
					<entry></entry>
					</row>
					<row>
					<entry>component-family</entry>
					<entry></entry>
					</row>
					<row>
					<entry>renderer-type</entry>
					<entry></entry>
					</row-->
                                        <row>
                                                  <entry>tag-class</entry>
                                                  <entry> org.richfaces.taglib.ColumnsTagHandler
                                                  </entry>
                                        </row>
                              </tbody>
                    </tgroup>
          </table>
          <section>
                    <title>Creating the Component with a Page Tag</title>
                    <para> To create the simplest variant on a page use the following syntax: </para>
                    <para>
                              <emphasis role="bold">Example:</emphasis>
                    </para>
                    <programlisting role="XML"><![CDATA[...
<rich:dataTable value="#{capitalsBean.capitals}" var="cap">
        <rich:columns value="#{capitalsBean.labels}" var="col" index="index">
                <h:outputText value="#{cap[index]}" />
        </rich:columns>	
</rich:dataTable>
...]]></programlisting>
          </section>
          <section>
                    <title>Creating the Component Dynamically Using Java</title>
                    <para>
                              <emphasis role="bold">Example:</emphasis>
                    </para>
                    <programlisting role="JAVA"><![CDATA[import org.richfaces.component.html.HtmlColumns;
...	
HtmlColumns myColumns = new HtmlColumns();
...]]></programlisting>
          </section>
          <section>
                    <title>Details of Usage</title>
                    <para> The <emphasis role="bold">
                                        <property>&lt;rich:columns&gt;</property>
                              </emphasis> component gets a list from data model and outputs
                              corresponding set of columns inside <emphasis role="bold">
                                        <property>&lt;rich:dataTable&gt;</property>
                              </emphasis> on a page. It is possible to use <emphasis>
                                        <property>&quot;header&quot;</property>
                              </emphasis> and <emphasis>
                                        <property>&quot;footer&quot;</property>
                              </emphasis> facets with <emphasis role="bold">
                                        <property>&lt;rich:columns&gt;</property>
                              </emphasis> component. </para>
                    <para> The <emphasis>
                                        <property>&quot;value&quot;</property>
                              </emphasis> and <emphasis>
                                        <property>&quot;var&quot;</property>
                              </emphasis> attributes are used to access the values of collection. </para>
                    <para>The simple example is placed below.</para>
                    <para>
                              <emphasis role="bold">Example:</emphasis>
                    </para>
                    <programlisting role="XML"><![CDATA[...
<rich:dataTable value="#{capitalsBean.capitals}" var="cap">
        <rich:columns value="#{capitalsBean.labels}" var="col" index="index">
                <f:facet name="header">
                        <h:outputText value="#{col.text}" />
                </f:facet>
	     <h:outputText value="#{cap[index]}" />
	     <f:facet name="footer">
	             <h:outputText value="#{col.text}" />
	     </f:facet>
        </rich:columns>	
</rich:dataTable>
...]]></programlisting>
                    <para> The <emphasis>
                                        <property>&quot;columns&quot;</property>
                              </emphasis> attribute defines the count of columns. </para>
                    <para> The <emphasis>
                                        <property>&quot;rowspan&quot;</property>
                              </emphasis> attribute defines the number of rows to be displayed. If
                              the value of this attribute is zero, all remaining rows in the table
                              are displayed on a page. </para>
                    <para> The <emphasis>
                                        <property>&quot;begin&quot;</property>
                              </emphasis> attribute contains the first iteration item. Note, that
                              iteration begins from zero. </para>
                    <para> The <emphasis>
                                        <property>&quot;end&quot;</property>
                              </emphasis> attribute contains the last iteration item. </para>
                    <para> With the help of the attributes described below you can customize the
                              output, i.e. define which columns and how many rows appear on a page. </para>
                    <para>
                              <emphasis role="bold">Example:</emphasis>
                    </para>
                    <programlisting role="XML"><![CDATA[...
<rich:dataTable value="#{capitalsBean.capitals}" var="cap">
        <rich:columns value="#{capitalsBean.labels}" var="col" index="index" rowspan="0" columns="3" begin="1" end="2">
                <f:facet name="header">
                        <h:outputText value="#{col.text}" />
                </f:facet>
                <h:outputText value="#{cap[index]}" />
        </rich:columns>	
</rich:dataTable>
...]]></programlisting>
                    <para> In the example below, columns from first to second and all rows are shown
                              in the <emphasis role="bold">
                                        <property>&lt;rich:dataTable&gt;</property>
                              </emphasis> . </para>
                    <para>The result is:</para>
                    <figure>
                              <title> Generated <emphasis role="bold">
                                                  <property>&lt;rich:columns&gt;</property>
                                        </emphasis> with columns from first to second and all rows </title>
                              <mediaobject>
                                        <imageobject>
                                                  <imagedata fileref="images/columns2.png"/>
                                        </imageobject>
                              </mediaobject>
                    </figure>
                    <para> The <emphasis role="bold">
                                        <property>&lt;rich:columns&gt;</property>
                              </emphasis> component does not prevent to use <emphasis role="bold">
                                        <property>&lt;rich:column&gt;</property>
                              </emphasis> . In the following example one column renders in any way
                              and another columns could be picked from the model. </para>
                    <para>
                              <emphasis role="bold">Example:</emphasis>
                    </para>
                    <programlisting role="XML"><![CDATA[...
<rich:dataTable value="#{rowBean.rows}" var="row">
        <rich:column>
                <h:outputText value ="#{row.columnValue}"/>
        </rich:column>
        <rich:columns value="#{colBean.columns}" var="col">
                <f:facet name="header">
                        <h:outputText value="#{col.header}"/>
                </f:facet>
                <h:outputText value="#{row.columnValue}"/>
                <f:facet name="footer">
                        <h:outputText value="#{col.footer}"/>
                </f:facet>
        </rich:columns>
</rich:dataTable>	
...]]></programlisting>

                    <para> In order to group columns with text information into one row, use the <emphasis>
                                        <property>&quot;colspan&quot;</property>
                              </emphasis> attribute, which is similar to an HTML one. In the
                              following example the third column contains 3 columns. In addition,
                              it&apos;s necessary to specify that the next column begins from
                              the first row with the help of the <code>breakBefore =
                                        &quot;true&quot;</code> . </para>
                    <para>
                              <emphasis role="bold">Example:</emphasis>
                    </para>
                    <programlisting role="XML"><![CDATA[...
<rich:dataTable value="#{columns.data1}" var="data">
        <rich:column>
                <h:outputText value="#{column.Item1}" />
        </rich:column>
        <rich:column>
                <h:outputText value="#{column.Item2}" />
        </rich:column>
        <rich:column>
                <h:outputText value="#{column.Item3}" />
        </rich:column>
        <rich:columns columns="3" colspan="3" breakBefore="true">	
                <h:outputText value="#{data.str0}" />
        </rich:columns>
</rich:dataTable>
...
]]></programlisting>

                    <!--para>As a result the following structure is rendered:</para>
			<figure>
			<title>&lt;rich:column&gt; modified with colspan and breakbefore attributes</title>
			<mediaobject> 
			<imageobject>
			<imagedata fileref="images/column3.png"/>
			</imageobject>
			</mediaobject>
			</figure-->

                    <para> The same way is used for <property>columns</property> grouping with the <emphasis>
                                        <property>&quot;rowspan&quot;</property>
                              </emphasis> attribute that is similar to an HTML. The only thing to
                              add in the example is an instruction to move onto the next row for
                              each next after the second column. </para>
                    <para>
                              <emphasis role="bold">Example:</emphasis>
                    </para>
                    <programlisting role="XML"><![CDATA[...
<rich:dataTable value="#{columns.data1}" var="data">
        <rich:columns columns="2" rowspan="3">	
                <h:outputText value="#{data.str0}" />
        </rich:columns>
        <rich:column>
                <h:outputText value="#{column.Item1}" />
        </rich:column>
        <rich:column  breakBefore="true">
                <h:outputText value="#{column.Item2}" />
        </rich:column>
        <rich:column  breakBefore="true">
                <h:outputText value="#{column.Item3}" />
        </rich:column>
</rich:dataTable>
...
]]></programlisting>

                    <!--para>As a result:</para>
			<figure>
			<title>&lt;rich:column&gt; generated with rowspan attribute</title>
			<mediaobject> 
			<imageobject>
			<imagedata fileref="images/column4.png"/>
			</imageobject>
			</mediaobject>
			</figure-->
                    <note>
                              <title>Note:</title>
                              <para> The <emphasis role="bold">
                                                  <property>&lt;rich:columns&gt;</property>
                                        </emphasis> tag is initialized during components tree
                                        building process. This process precedes page rendering at
                                        &quot;Render Response&quot; JSF phase. To be
                                        rendered properly the component needs all it variables to be
                                        initialized while the components tree is being building. A
                                                  <emphasis>javax.servlet.jsp.JspTagException</emphasis>
                                        occurs if <emphasis role="bold">
                                                  <property>&lt;rich:columns&gt;</property>
                                        </emphasis> uses variables passed from other components, if
                                        these variables are initialized during rendering. Thus, when
                                                  <emphasis role="bold">
                                                  <property>&lt;rich:columns&gt;</property>
                                        </emphasis> is asking for such variables they do not already
                                        exist. Use <property>&lt;c:forEach&gt;</property>
                                        JSP standard tag as workaround. Compare two examples below. </para>
                              <para> This code calls the exception: </para>
                              <programlisting role="XML"><![CDATA[...
<rich:dataTable value="#{bean.data}" var="var">
          <rich:columns value="#{var.columns}">
             ...
          </rich:columns>
</rich:dataTable>
...
]]></programlisting>
                              <para> This code works properly: </para>
                              <programlisting role="XML"><![CDATA[...
<c:forEach items="#{bean.data}" var="var">
          <rich:columns value="#{var.columns}">
             ...
          </rich:columns>
</c:forEach>
...
]]></programlisting>
                    </note>


                    <para> Information about sorting and filtering you can find <link
                                        linkend="sortAndFilter">here</link> . </para>

          </section>

          <section>
                    <title>Look-and-Feel Customization</title>

                    <para> For skinnability implementation, the components use a <emphasis>
                                        <property>style class redefinition method.</property>
                              </emphasis> Default style classes are mapped on <emphasis>
                                        <property>skin parameters.</property>
                              </emphasis>
                    </para>
                    <para> There are two ways to redefine the appearance of all <emphasis
                                        role="bold">
                                        <property>&lt;rich:columns&gt;</property>
                              </emphasis> components at once: </para>
                    <itemizedlist>
                              <listitem>
                                        <para>Redefine the corresponding skin parameters</para>
                              </listitem>
                              <listitem>
                                        <para> Add to your style sheets <emphasis>
                                                  <property>style classes</property>
                                                  </emphasis> used by a <emphasis role="bold">
                                                  <property>&lt;rich:columns&gt;</property>
                                                  </emphasis> component </para>
                              </listitem>
                    </itemizedlist>
          </section>
          <section>
                    <title>Skin Parameters Redefinition</title>

                    <para> Skin parameters redefinition for <emphasis role="bold">
                                        <property>&lt;rich:columns&gt;</property>
                              </emphasis> are the same as for the <emphasis role="bold">
                                        <property>&lt;rich:dataTable&gt;</property>
                              </emphasis>
                              <link linkend="SPR">component</link> . </para>
          </section>
          <section>
                    <title>Definition of Custom Style Classes</title>

                    <para> Custom style classes for <emphasis role="bold">
                                        <property>&lt;rich:columns&gt;</property>
                              </emphasis> are the same as for the <emphasis role="bold">
                                        <property>&lt;rich:dataTable&gt;</property>
                              </emphasis>
                              <link linkend="DofCCS">component</link> . </para>

                    <para> In order to redefine styles for all <emphasis role="bold">
                                        <property>&lt;rich:columns&gt;</property>
                              </emphasis> components on a page using CSS, it&apos;s enough to
                              create classes with the same names (possible classes could be found in
                              the tables <link linkend="SPR">above</link> ) and define necessary
                              properties in them. </para>

                    <para>
                              <emphasis role="bold">Example:</emphasis>
                    </para>
                    <programlisting role="CSS"><![CDATA[...
.rich-table-subheadercell{
        color: #a0a0a0;
}	
...]]></programlisting>

                    <para>This is a result:</para>

                    <figure>
                              <title>Redefinition styles with predefined classes</title>
                              <mediaobject>
                                        <imageobject>
                                                  <imagedata fileref="images/columns_pc.png"/>
                                        </imageobject>
                              </mediaobject>
                    </figure>

                    <para> In the example column header cells color was changed. </para>

                    <para> Also it&apos;s possible to change styles of particular <emphasis
                                        role="bold">
                                        <property>&lt;rich:columns&gt;</property>
                              </emphasis> component. In this case you should create own style
                              classes and use them in corresponding <emphasis role="bold">
                                        <property>&lt;rich:columns&gt;</property>
                              </emphasis>
                              <emphasis>
                                        <property>styleClass</property>
                              </emphasis> attributes. An example is placed below: </para>

                    <para>
                              <emphasis role="bold">Example:</emphasis>
                    </para>
                    <programlisting role="CSS"><![CDATA[...
.myClass {
        font-style: oblique;
}
...]]></programlisting>
                    <para> The <emphasis>
                                        <property>&quot;styleClass&quot;</property>
                              </emphasis> attribute for <emphasis role="bold">
                                        <property>&lt;rich:columns&gt;</property>
                              </emphasis> is defined as it&apos;s shown in the example below: </para>

                    <para>
                              <emphasis role="bold">Example:</emphasis>
                    </para>
                    <programlisting role="XML"><![CDATA[<rich:columns  styleClass="myClass">
]]></programlisting>

                    <para>This is a result:</para>

                    <figure>
                              <title> Redefinition styles with own classes and <emphasis>
                                                  <property>styleClass</property>
                                        </emphasis> attributes </title>
                              <mediaobject>
                                        <imageobject>
                                                  <imagedata fileref="images/columns_oc.png"/>
                                        </imageobject>
                              </mediaobject>
                    </figure>

                    <para> As it could be seen on the picture above, the font style for columns was
                              changed. </para>
          </section>

          <section>
                    <title>Relevant Resources Links</title>
                    <para>
                              <ulink
                                        url="http://livedemo.exadel.com/richfaces-demo/richfaces/dataTable.jsf?c=columns"
                                        > Here </ulink> you can found some additional information
                              for <emphasis role="bold">
                                        <property>&lt;rich:columns&gt;</property>
                              </emphasis> component usage. </para>
          </section>
</section>
