[英]Passing parameters in JSF and PrimeFaces
我正在研究PrimeFaces AutoComplete演示。 我從完整的展示演示中簡化了它。 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;
}
}
我省略了一個Convert類,我認為這沒有什么關系。
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>
我對此有三個問題:
1)completeMethod =“#{autoCompleteView.completeQuery}”:在不傳遞參數的情況下調用completeQuery方法,但將其定義為completeQuery(String query)。 這是如何運作的?
2)value =“#{autoCompleteView.query}”。 查詢是在AutoCompleteBean中定義的對象。 該查詢對象如何將用戶輸入的字符串作為其值? 通常,InputText的值很適合接受用戶輸入,它是一個String值。
3)我是否仍可以向p:autoComplete組件添加屬性“ action = ...”?
您在此處省略的轉換器類扮演了真正的角色。...讓我們看看您的問題
如您所見,轉換器類覆蓋了2個方法
getAsString
和getAsObject
1)價值
completeMethod="#{autoCompleteView.completeQuery}
被引用
autoCompleteView.completeQuery(autoCompleteView.query);
正如您在Query類中找到字符串方法一樣。
2).as為自動完成定義了轉換器,它調用getAsString方法在屏幕上呈現。 當選擇getAsObject方法時,將字符串值轉換為object(Query)。
3)可以使用ajax選擇事件
<p:ajax event="select" listener="#{autoCompleteView.someMethod}">
或通過p:autoComplete中的onSelect屬性調用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}" />
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