extiendo HtmlTableRenderer procesador defecto y sobrescribir renderRowStart método para lograr esto dando estilo de atributo en table-> tr elemento con valor pantalla: ninguna.
El elemento dentro de la lista de enlaces necesita implementar la interfaz TableRow que solo tiene un método de isHide. En la clase concreta puedes poner cualquier lógica que desees para dar un valor booleano.
Por cierto, en este renderizador personalizado también tiene la función PrimeFaces como función que da el mensaje cuando la tabla está vacía y table-> tr calculará automáticamente cuántas columnas en la tabla y dará el valor adecuado al atributo colspan.
public class MyDataTableRenderer extends HtmlTableRenderer {
private static final Integer[] ZERO_INT_ARRAY = new Integer[] { 0 };
private static final String NO_RESULT_MESSAGE_ATTR_NAME = "noResultMessage";
private static final String defaultEmptyMessage = "No records found";
private static final Logger log = Logger.getLogger(DHSDataTableRenderer.class.getName());
@Override
public void encodeInnerHtml(FacesContext facesContext, UIComponent component) throws IOException {
UIData uiData = (UIData) component;
String message = (String) uiData.getAttributes().get(NO_RESULT_MESSAGE_ATTR_NAME);
if (message == null || "".equals(message.trim())) {
message = defaultEmptyMessage;
}
ResponseWriter writer = facesContext.getResponseWriter();
int rowCount = uiData.getRowCount();
int newspaperColumns = getNewspaperColumns(component);
int columnNumber = getChildCount(component);
if (rowCount == -1 && newspaperColumns == 1) {
encodeInnerHtmlUnknownRowCount(facesContext, component);
return;
}
if (rowCount == 0) {
// nothing to render, to get valid xhtml we render an empty dummy
// row
writer.startElement(HTML.TBODY_ELEM, uiData);
writer.writeAttribute(HTML.ID_ATTR, component.getClientId(facesContext) + ":tbody_element", null);
writer.startElement(HTML.TR_ELEM, uiData);
writer.startElement(HTML.TD_ELEM, uiData);
writer.writeAttribute(HTML.COLSPAN_ATTR, columnNumber, null);
writer.writeAttribute(HTML.CLASS_ATTR, "dhs-empty-table", null);
writer.write(message);
writer.endElement(HTML.TD_ELEM);
writer.endElement(HTML.TR_ELEM);
writer.endElement(HTML.TBODY_ELEM);
return;
}
// begin the table
// get the CSS styles
Styles styles = getStyles(uiData);
int first = uiData.getFirst();
int rows = uiData.getRows();
int last;
if (rows <= 0) {
last = rowCount;
} else {
last = first + rows;
if (last > rowCount) {
last = rowCount;
}
}
int newspaperRows;
if ((last - first) % newspaperColumns == 0) {
newspaperRows = (last - first)/newspaperColumns;
} else {
newspaperRows = ((last - first)/newspaperColumns) + 1;
}
boolean newspaperHorizontalOrientation = isNewspaperHorizontalOrientation(component);
// get the row indizes for which a new TBODY element should be created
Integer[] bodyrows = getBodyRows(facesContext, component);
int bodyrowsCount = 0;
// walk through the newspaper rows
for (int nr = 0; nr < newspaperRows; nr++) {
boolean rowStartRendered = false;
// walk through the newspaper columns
for (int nc = 0; nc < newspaperColumns; nc++) {
// the current row in the 'real' table
int currentRow;
if (newspaperHorizontalOrientation) {
currentRow = nr * newspaperColumns + nc + first;
} else {
currentRow = nc * newspaperRows + nr + first;
}
// if this row is not to be rendered
if (currentRow >= last) {
continue;
}
// bail if any row does not exist
uiData.setRowIndex(currentRow);
if (!uiData.isRowAvailable()) {
log.severe("Row is not available. Rowindex = " + currentRow);
break;
}
if (nc == 0) {
// first column in table, start new row
beforeRow(facesContext, uiData);
// is the current row listed in the bodyrows attribute
if (ArrayUtils.contains(bodyrows, currentRow)) {
// close any preopened TBODY element first
if (bodyrowsCount != 0) {
HtmlRendererUtils.writePrettyLineSeparator(facesContext);
writer.endElement(HTML.TBODY_ELEM);
}
HtmlRendererUtils.writePrettyLineSeparator(facesContext);
writer.startElement(HTML.TBODY_ELEM, uiData);
// Do not attach bodyrowsCount to the first TBODY
// element, because of backward compatibility
writer.writeAttribute(HTML.ID_ATTR, component.getClientId(facesContext) + ":tbody_element" + (bodyrowsCount == 0 ? "" : bodyrowsCount),
null);
bodyrowsCount++;
}
HtmlRendererUtils.writePrettyLineSeparator(facesContext);
renderRowStart(facesContext, writer, uiData, styles, nr);
rowStartRendered = true;
}
List<UIComponent> children = null;
for (int j = 0, size = getChildCount(component); j < size; j++) {
if (children == null) {
children = getChildren(component);
}
UIComponent child = children.get(j);
if (child.isRendered()) {
boolean columnRendering = child instanceof UIColumn;
if (columnRendering) {
beforeColumn(facesContext, uiData, j);
}
encodeColumnChild(facesContext, writer, uiData, child, styles, nc * uiData.getChildCount() + j);
if (columnRendering) {
afterColumn(facesContext, uiData, j);
}
}
}
if (hasNewspaperTableSpacer(uiData)) {
// draw the spacer facet
if (nc < newspaperColumns - 1) {
renderSpacerCell(facesContext, writer, uiData);
}
}
}
if (rowStartRendered) {
renderRowEnd(facesContext, writer, uiData);
afterRow(facesContext, uiData);
}
}
if (bodyrowsCount != 0) {
// close the last TBODY element
HtmlRendererUtils.writePrettyLineSeparator(facesContext);
writer.endElement(HTML.TBODY_ELEM);
}
}
@Override
protected void renderRowStart(FacesContext facesContext, ResponseWriter writer, UIData uiData, Styles styles, int rowStyleIndex) throws IOException {
writer.startElement(HTML.TR_ELEM, null); // uiData);
renderRowStyle(facesContext, writer, uiData, styles, rowStyleIndex);
Object obj = uiData.getRowData();
boolean isHide = false;
if (obj instanceof TableRow) {
isHide = ((TableRow) obj).isHide();
}
if (isHide) {
writer.writeAttribute("style", "display: none;", null);
}
Object rowId = uiData.getAttributes().get(org.apache.myfaces.shared.renderkit.JSFAttr.ROW_ID);
if (rowId != null) {
writer.writeAttribute(HTML.ID_ATTR, rowId.toString(), null);
}
}
private void encodeInnerHtmlUnknownRowCount(FacesContext facesContext, UIComponent component) throws IOException {
UIData uiData = (UIData) component;
ResponseWriter writer = facesContext.getResponseWriter();
Styles styles = getStyles(uiData);
Integer[] bodyrows = getBodyRows(facesContext, component);
int bodyrowsCount = 0;
int first = uiData.getFirst();
int rows = uiData.getRows();
int currentRow = first;
boolean isRowRendered = false;
while (true) {
uiData.setRowIndex(currentRow);
if (!uiData.isRowAvailable()) {
break;
}
isRowRendered = true;
// first column in table, start new row
beforeRow(facesContext, uiData);
// is the current row listed in the bodyrows attribute
if (ArrayUtils.contains(bodyrows, currentRow)) {
// close any preopened TBODY element first
if (bodyrowsCount != 0) {
HtmlRendererUtils.writePrettyLineSeparator(facesContext);
writer.endElement(HTML.TBODY_ELEM);
}
HtmlRendererUtils.writePrettyLineSeparator(facesContext);
writer.startElement(HTML.TBODY_ELEM, uiData);
// Do not attach bodyrowsCount to the first TBODY element,
// because of backward compatibility
writer.writeAttribute(HTML.ID_ATTR, component.getClientId(facesContext) + ":tbody_element" + (bodyrowsCount == 0 ? "" : bodyrowsCount), null);
bodyrowsCount++;
}
HtmlRendererUtils.writePrettyLineSeparator(facesContext);
renderRowStart(facesContext, writer, uiData, styles, currentRow);
List<UIComponent> children = null;
for (int j = 0, size = getChildCount(component); j < size; j++) {
if (children == null) {
children = getChildren(component);
}
UIComponent child = children.get(j);
if (child.isRendered()) {
boolean columnRendering = child instanceof UIColumn;
if (columnRendering) {
beforeColumn(facesContext, uiData, j);
}
encodeColumnChild(facesContext, writer, uiData, child, styles, j);
if (columnRendering) {
afterColumn(facesContext, uiData, j);
}
}
}
renderRowEnd(facesContext, writer, uiData);
afterRow(facesContext, uiData);
currentRow++;
if (rows > 0 && currentRow - first > rows) {
break;
}
}
if (!isRowRendered) {
// nothing to render, to get valid xhtml we render an empty dummy
// row
writer.startElement(HTML.TBODY_ELEM, uiData);
writer.writeAttribute(HTML.ID_ATTR, component.getClientId(facesContext) + ":tbody_element", null);
writer.startElement(HTML.TR_ELEM, uiData);
writer.startElement(HTML.TD_ELEM, uiData);
writer.endElement(HTML.TD_ELEM);
writer.endElement(HTML.TR_ELEM);
writer.endElement(HTML.TBODY_ELEM);
return;
}
if (bodyrowsCount != 0) {
// close the last TBODY element
HtmlRendererUtils.writePrettyLineSeparator(facesContext);
writer.endElement(HTML.TBODY_ELEM);
}
}
private Integer[] getBodyRows(FacesContext facesContext, UIComponent component) {
Integer[] bodyrows = null;
String bodyrowsAttr = (String) component.getAttributes().get(JSFAttr.BODYROWS_ATTR);
if (bodyrowsAttr != null && !"".equals(bodyrowsAttr)) {
String[] bodyrowsString = StringUtils.trim(StringUtils.splitShortString(bodyrowsAttr, ','));
// parsing with no exception handling, because of JSF-spec:
// "If present, this must be a comma separated list of integers."
bodyrows = new Integer[bodyrowsString.length];
for (int i = 0; i < bodyrowsString.length; i++) {
bodyrows[i] = new Integer(bodyrowsString[i]);
}
} else {
bodyrows = ZERO_INT_ARRAY;
}
return bodyrows;
}
}
Lo lamentamos, esta no es una opción: esta tabla muestra ciertos datos de referencia de toda la aplicación, excepto en esta instancia particular, que los datos solo se pueden mostrar bajo ciertas condiciones. – Elie
¿Dos colecciones entonces, una con todos los datos, la segunda con las cosas para mostrar? – Naganalf
El problema es que tengo 2 filas, y dependiendo del caso, algunas veces veo la fila A, a veces la fila B, y algunas veces ambas. Mantener varios conjuntos significa que tengo que mantener tres versiones de esto, lo cual no es ideal. Espero que haya otra forma de hacer esto. – Elie