jsf - PrimeFaces DataTable中的filterMatchMode如何工作？

通过Primefaces Datatable，您可以使用属性filterMatchMode配置用于列的过滤类型。

但是，如果使用LazyDataModel，则必须实现自己的搜索方法，该方法根本不会接收该属性。此功能仅对正常的DataModels有用吗？

最佳答案

当前，LazyDataModel尚不支持此功能，但是您仍然可以花费很少的精力来使用它。 blemasle posted primefaces论坛上的相应补丁，不幸的是，开发人员仍然没有任何回应。

如果您想使用非代码入侵解决方案，则可以尝试使用我的解决方案。

过滤器约束可通过以下方式获得:

 /**
 * @param tableSearchExpr expression, starting from the view root,
 *        which identifies the datatable to retrieve information from
 * @return map, containing pairs of {@code <filtered field id, match mode>}.
 *         Filtered field id is evaluated from the 'filterBy'
 *         attribute of the column in the following way:
 *         #{item.name} -> name
 *         #{item.category.name} -> category.name
 */
public Map<String, FilterMatchMode> getFiltersMatchMode(String tableSearchExpr) {
    FacesContext context = FacesContext.getCurrentInstance();
    Object component = context.getViewRoot().findComponent(tableSearchExpr);

    if (null == component) {
        throw new IllegalArgumentException(
                    "No component found for search expression: "
                            + tableSearchExpr);
    }
    if (!(component instanceof DataTable)) {
        throw new IllegalArgumentException(
                    "Component is not a DataTable: " + tableSearchExpr);
    }

    DataTable table = (DataTable) component;
    Map<String, FilterMatchMode> constraints =
            new HashMap<String, FilterMatchMode>(table.getColumns().size());

    for (UIColumn column : table.getColumns()) {
        ValueExpression filterExpression =
                  column.getValueExpression("filterBy");
        if (null != filterExpression) {
            String filterExpressionString = filterExpression.
                                                   getExpressionString();
            //evaluating filtered field id
            String filteredField = filterExpressionString.substring(
                    filterExpressionString.indexOf('.') + 1,
                    filterExpressionString.indexOf('}'));

            FilterMatchMode matchMode =
                  FilterMatchMode.fromUiParam(column.getFilterMatchMode());

            constraints.put(filteredField, matchMode);
        }
    }

    return constraints;
}

其中FilterMatchMode为:

public enum FilterMatchMode {

STARTS_WITH("startsWith"), ENDS_WITH("endsWith"),
CONTAINS("contains"), EXACT("exact");

/**
 * Value of p:column's filterMatchMode attribute
 *     which corresponds to this math mode
 */
private final String uiParam;

FilterMatchMode(String uiParam) {
    this.uiParam = uiParam;
}

/**
 * @param uiParam value of p:column's filterMatchMode attribute
 * @return MatchMode which corresponds to given UI parameter
 * @throws IllegalArgumentException if no MatchMode
 *          is corresponding to given UI parameter
 */
public static FilterMatchMode fromUiParam(String uiParam) {
    for (FilterMatchMode matchMode : values()) {
        if (matchMode.uiParam.equals(uiParam)) {
            return matchMode;
        }
    }
    throw new IllegalArgumentException("No MatchMode found for " + uiParam);
}

}

关于jsf - PrimeFaces DataTable中的filterMatchMode如何工作？，我们在Stack Overflow上找到一个类似的问题：https://stackoverflow.com/questions/6670298/