JSF 2 -- 保存所有有效的组件值 [英] JSF 2 -- Save All Valid Component Values

问题描述

我需要创建一个 javascript 函数，该函数在调用时会将所有有效组件保存在 JSF 2.0 表单上.由于完整的表单作为一个整体永远不会有效，我需要找出一种方法来运行每个组件的生命周期，以便如果验证阶段成功，模型将被更新并最终保存.

I have a requirement to create a javascript function that when invoked will save all of the valid components on a JSF 2.0 form. Since the complete form will never be valid as a whole I need to figure out a way to run the lifecycle per component so that if the validation phase is successful the model will be updated and eventually saved.

理想情况下，这需要是单个 ajax 请求，因为使用单独的 ajax 请求迭代每个组件会非常低效.

Ideally, this needs to be a single ajax request as iterating over each component with a separate ajax request would be painfully inefficient.

以前有没有人解决过这个问题?如果不能，你能给我一些关于可能实现的指示吗?

Has anyone solved the problem before? If not could you give me some pointers on possible implementations?

这是我目前看来运行良好的:

Here's what I have that seems to be working well so far:

@ManagedBean(name = "partialAppSaveBean")
@RequestScoped
public class PartialAppSaveBean implements Serializable {

    protected static final Logger LOGGER = LoggerFactory.getLogger(PartialAppSaveBean.class);
    private static final long serialVersionUID = 1L;

    /**
     * Save any valid Application values
     *
     * @param event
     */
    public void saveData(AjaxBehaviorEvent event) {
        final FacesContext context = FacesContext.getCurrentInstance();

        UIForm form = getParentForm(event.getComponent());
        Set<VisitHint> hints = EnumSet.of(VisitHint.SKIP_UNRENDERED);

        form.visitTree(VisitContext.createVisitContext(context, null, hints), new VisitCallback() {

            @Override
            public VisitResult visit(VisitContext context, UIComponent component) {
            if (component instanceof UIInput) {
                UIInput input = (UIInput) component;
                input.validate(context.getFacesContext());

                if (input.isValid() && input.getValue() != null) {
                    ValueExpression valueExpression = input.getValueExpression("value");

                    if (valueExpression != null
                            && valueExpression.getExpressionString() != null) {
                        try {
                            valueExpression.setValue(context.getFacesContext().getELContext(), input.getValue());
                        } catch (Exception ex) {
                            LOGGER.error("Expression [ " + valueExpression.getExpressionString() + 
                                    "] value could not be set with value [" + input.getValue() + "]", ex);
                        }                            
                    }
                }
            }

            return VisitResult.ACCEPT;
            }
        });

        //Save data here
    }

    /**
     * Returns the parent form for this UIComponent
     * 
     * @param component
     * @return form
     */
    private static UIForm getParentForm(UIComponent component) {
        while (component.getParent() != null) {
            if (component.getParent() instanceof UIForm) {
                return (UIForm) component.getParent();
            } else {
                return getParentForm(component.getParent());
            }
        }

        return null;
    }

}

调用类似:

<h:commandButton
    id="saveData">
    <f:ajax listener="#{partialAppSaveBean.saveData}" execute="@form" immediate="true" onevent="onPartialSave" />
</h:commandButton>

推荐答案

你可以使用 UIComponent#visitTree()UIForm.

You could use UIComponent#visitTree() on the UIForm.

FacesContext context = FacesContext.getCurrentInstance();
UIForm form = getFormSomehow();
Map<String, Object> validValues = new HashMap<String, Object>();
Set<VisitHint> hints = EnumSet.of(VisitHint.SKIP_UNRENDERED);

form.visitTree(VisitContext.createVisitContext(context, null, hints), new VisitCallback() {

    @Override
    public VisitResult visit(VisitContext context, UIComponent component) {
        if (component instanceof UIInput) {
            UIInput input = (UIInput) component;

            if (input.isValid()) {
                validValues.put(input.getClientId(context.getFacesContext()), input.getValue());
            }
        }

        return VisitResult.ACCEPT;
    }
});

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