我扩展 HtmlTableRenderer 默认渲染器并覆盖 renderRowStart 方法，通过将 style 属性赋予 table- >tr 元素，值为 display:none。
绑定列表中的item需要实现TableRow接口，只有一个isHide方法。在具体类中，您可以放置您喜欢的任何逻辑来提供布尔值。
顺便说一句，在这个自定义渲染器中也有类似 PrimeFaces 实现的函数，它在表为空时给出消息，并且 table->tr 将自动计算表中有多少列并为 colspan 属性提供适当的值。
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;
}
}