HtmlDataTable dynamic row setting

Question

I have an HtmlDataTable component that i wish to dynamicaly change the values of the rows when the table is buit. I wish to have an icon (a graphicImage) displayed (its rendered property set to true) in a row if a certain condition is met or, if the condition is not met then the icon should not be displayed ( its rendered property set to false). My question is how do you access the rows of the dataTable to access the component to set the rendered property before the table is rendered. I created a component binding expression within the graphicImage tag but the bean getter only gets called once ( i assumed it would get called for each row of the table). The jsf code for the table is displayed below:
<h:dataTable value="#{SoFoBean.featureList}"
var="fo"
id="foListTable"
styleClass="tableBackground"
rowClasses="tableOddRow, tableEvenRow"
cellspacing="1"
cellpadding="1"
binding="#{SoFoBean.foListTable}">
<h:column id="foListCol">
<f:verbatim>
<div id="foListRow">
</f:verbatim>
<h:graphicImage value="images/SoFo/KeyOneIcon.png"
binding="#{SoFoBean.keyOneIcon}"/>
<f:verbatim>
</div> <%--foListRow --%>
</f:verbatim>
....... snip .........
</h:column>
</h:dataTable>

Answer 1

For something similar I have created a small custom component that will translate a "code" into a image url.
Maybe something similar would make sense to you?
Basically extend the classes for the graphicImage (tag, component). Add two attributes
    <attribute>
      <description>The code which must be translated into an image. Usually
        this is a value-binding.</description>
      <attribute-name>lookupValue</attribute-name>
      <attribute-class>java.lang.String</attribute-class>
    </attribute>
    <attribute>
      <description>A value-binding resolving into a
        java.util.Map-implementation containing code/image-path map-entries.
        The code is used as the key for the Map lookup object. The value must
        contain the image path/name. It is recommended that the path starts
        with a "/" because the JSF-renderer will then add the context-name in
        front if it. </description>
      <attribute-name>lookupMap</attribute-name>
      <attribute-class>java.lang.String</attribute-class>
    </attribute>reroute getValue() and getUrl() to your own "translate-method"
   * @see javax.faces.component.UIGraphic#getUrl()
  public String getUrl() {
    return lookupImageUrl();
   * @see javax.faces.component.UIGraphic#getValue()
  public Object getValue() {
    return lookupImageUrl();
  private String lookupImageUrl() {
    String imageUrl;
    Map lookup = (Map) getValueBinding("lookupMap").getValue(getFacesContext());
    String lookupValue = (String) getValueBinding("lookupValue").getValue(
        getFacesContext());
    String currentValue = lookupValue;
    if (currentValue != null && lookup != null) {
      if (lookup.containsKey(currentValue)) {
        imageUrl = (String) lookup.get(currentValue);
      } else {
        imageUrl = "NOTFOUND: " + lookupValue;
        log.error("value (" + lookupValue + ") not found in map "
            + StringUtils.toStringForLog(lookup));
    } else {
      imageUrl = "missing lookupValue or lookupMap";
      log.error("missing attribute(s)! lookupValue =" + lookupValue + " map ="
          + StringUtils.toStringForLog(lookup));
    return imageUrl;
  }In the tag return "" for the renderer-type, then you can "reuse" the standard JSF-renderer ;-)
hth
Alexander