Question

我正在研究PrimeFaces AutoComplete演示。我从完整的展示演示中缩短了它。 http://www.primefaces.org/showcase/ui/input/autoComplete.xhtml

AutoCompleteBean.java

 @ManagedBean
public class AutoCompleteBean {         
    private Query query;
    private List<Query> queries = new ArrayList<Query>();

    @PostConstruct
    public void init() {
        queries.add(new Query(0, "Afterdark", "afterdark"));
        queries.add(new Query(1, "Afternoon", "afternoon"));
        queries.add(new Query(2, "Afterwork", "afterwork"));
        queries.add(new Query(3, "Aristo", "aristo"));            
    }

    public List<Query> completeQuery(String query) { 
       List<Query> filteredQueries = new ArrayList<Query>();
        for (int i = 0; i < queries.size(); i++) {
            Query skin = queries.get(i);
            if(skin.getName().toLowerCase().contains(query)) {
                filteredQueries.add(skin);
            }
        }

        return filteredQueries;
    }

    public void onItemSelect(SelectEvent event) {
        FacesContext.getCurrentInstance().addMessage(null, new FacesMessage("Item Selected", event.getObject().toString()));
    }

    public Query getQuery() {
        return query;
    }

    public void setQuery(Query query) {
        this.query = query;
    }
}

Query.java

public class Query {

    private int id;   
    private String displayName;  
    private String name;

    public Query() {}

    public Query(int id, String displayName, String name) {
        this.id = id;
        this.displayName = displayName;
        this.name = name;
    }

    public int getId() {
        return id;
    }

    public void setId(int id) {
        this.id = id;
    }

    public String getDisplayName() {
        return displayName;
    }

    public void setDisplayName(String displayName) {
        this.displayName = displayName;
    }

    public String getName() {
        return name;
    }

    public void setName(String name) {
        this.name = name;
    }

    @Override
    public String toString() {
        return name;
    }
}

我省略了一个转换类，我认为它并不相关。

search.xhtml

<h:form>
    <p:growl id="msgs" showDetail="true" />
    <h:panelGrid columns="2" cellpadding="5">
        <p:autoComplete id="queryPojo" value="#{autoCompleteView.query}"
        completeMethod="#{autoCompleteView.completeQuery}" var="query"
                    itemLabel="#{query.displayName}" itemValue="#{query}"
                    converter="queryConverter" forceSelection="true" />

        <p:commandButton value="search" oncomplete="PF('dlg').show()"/>

    </h:panelGrid>
</h:form>

我有三个问题：

1）completeMethod =＆＃34;＃{autoCompleteView.completeQuery}＆＃34 ;:在不传递参数的情况下调用completeQuery方法，但它被定义为completeQuery（字符串查询）。这是如何工作的？

2）value =＆＃34;＃{autoCompleteView.query}＆＃34;。 Query是AutoCompleteBean中定义的对象。这个Query对象如何将用户输入字符串作为其值？通常，InputText的值适用于获取用户输入，这是一个字符串值。

3）我还可以添加属性＆＃34; action = ...＆＃34;到p：autoComplete componentsnet？

Answer 1

你在这里省略的转换器类玩真正的游戏....让我们看看你的问题

如您所见，转换器类会覆盖2个方法

getAsString和getAsObject

1）值

completeMethod="#{autoCompleteView.completeQuery}

被重构为

autoCompleteView.completeQuery(autoCompleteView.query);

你可以在Query类中找到string方法。

2）.as转换器定义为自动完成，它调用getAsString方法在屏幕上呈现。选中时，调用getAsObject方法将字符串值转换为object（Query）。

3）你可以使用ajax select event

<p:ajax event="select" listener="#{autoCompleteView.someMethod}">

或通过p：autoComplete

中的onSelect属性调用remoteCommand

    <p:autoComplete id="queryPojo" value="#{autoCompleteView.query}" onSelect="someRemoteCommand();"
  completeMethod="#{autoCompleteView.completeQuery}" var="query"
                    itemLabel="#{query.displayName}" itemValue="#{query}"
                    converter="queryConverter" forceSelection="true" />
<p:remoteCommand name="someRemoteCommand" update="queryPojo" actionListener="#{autoCompleteView.execute}" />

在JSF和PrimeFaces中传递参数

1 个答案: