起始面流 [英] Starting faces flow

问题描述

我今天的问题是:是否可以在不使用h:commandButton组件的情况下启动人流?在我的特定情况下，我想使用h:selectOneMenu组件根据用户选择的值来启动特定的流程.

My question for today is: is it possible to start the faces flow without using h:commandButton component? In my particular case I would like to use the h:selectOneMenu component to start the particular flow based on the value selected by the user.

推荐答案

答案是肯定的，但有一些调整.要输入流，需要创建等于流id的导航结果. UICommand 组件(例如h:commandButton和h:commandLink)可以做到但是 UIInput 组件不能(它们缺少动作"属性).但是，导航可以以编程方式触发，例如通过导航来触发.通过使用 ValueChangeListener :

The answer is yes, but with a bit of tweaking. To enter a flow, it is required to create a navigation outcome that equals the flows id. UICommand components (like h:commandButton and h:commandLink) can do that but UIInput components can not (they lack the "action" attribute). However, navigation may be triggered programmatically e.g. by using a ValueChangeListener:

    <h:form>
        <h:selectOneMenu value="#{requestScope.selectedFlow}">
            <f:selectItem itemLabel="--- Select a Flow ---" noSelectionOption="true" />
            <f:selectItem itemLabel="Flow A" itemValue="flow-a" />
            <f:selectItem itemLabel="Flow B" itemValue="flow-b" />
            <f:valueChangeListener type="example.NaviagtionTargetListener" />
            <f:ajax execute="@form" render="@all"/>
        </h:selectOneMenu>           
    </h:form>

相应的ValueChangeListener:

The corresponding ValueChangeListener:

public class NaviagtionTargetListener implements ValueChangeListener {

    @Override
    public void processValueChange(ValueChangeEvent event) throws AbortProcessingException {
        String target = (String) event.getNewValue();
        ConfigurableNavigationHandler nh =  (ConfigurableNavigationHandler) FacesContext.getCurrentInstance().getApplication().getNavigationHandler();
        nh.performNavigation(target);
    }

}

我在GitHub [1]上创建了一个示例，并撰写了有关FacesFlow [2]用法的博客文章

I created an example on GitHub[1] and wrote a blogpost about the usage of FacesFlow[2]

[1] https://github.com/tasel/facesflow-example

[2] http://blog.oio .de/2014/02/12/a-comprehensive-example-of-jsf-faces-flow/

这篇关于起始面流的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！