如何访问jsf数据表中的Map键 [英] How to access Map key in jsf datatable
本文介绍了如何访问jsf数据表中的Map键的处理方法,对大家解决问题具有一定的参考价值,需要的朋友们下面随着小编来一起学习吧!
问题描述
我收到错误 javax.el.PropertyNotFoundException:/member/apps/cms/edit.xhtml @228,49 value="#{props.key}": Property 'key' not found on尝试显示下面的数据表时键入 java.util.HashMap$Values
.
<p:dataTable id="properties" var="props" value="#{contentEditorBacking.properties}" editable="true">
<p:column headerText="Property">
<p:cellEditor>
<f:facet name="output">
<h:outputText value="#{props.key}" />
</f:facet>
<f:facet name="input">
<h:inputText value="#{props.key}" />
</f:facet>
</p:cellEditor>
</p:column>
<p:column headerText="Value">
<p:cellEditor>
<f:facet name="output">
<h:outputText value="#{props.value}" />
</f:facet>
<f:facet name="input">
<h:inputText value="#{props.value}" />
</f:facet>
</p:cellEditor>
</p:column>
<p:column headerText="Edit">
<p:rowEditor />
<!-- Need to put an update on here yet -->
<p:commandLink styleClass="ui-icon ui-icon-trash" id="deleteProperty" actionListener="#{contentEditorBacking.deleteProperty}">
<f:attribute name="key" value="#{props.key}" />
</p:commandLink>
</p:column>
</p:dataTable>
这是我的 contentEditorBacking 的相关部分:
Here's the relevant part of my contentEditorBacking:
@ManagedBean
@ViewScoped
public class ContentEditorBacking {
private Map<String, Properties> properties = new LinkedHashMap<String, Properties>();
public Collection<Properties> getProperties() throws Exception{
return properties.values();
}
public static class Properties{
private String key;
private String value;
public Properties(String key, String value) {
super();
this.key = key;
this.value = value;
}
public String getKey() {
return key;
}
public void setKey(String key) {
this.key = key;
}
public String getValue() {
return value;
}
public void setValue(String value) {
this.value = value;
}
@Override
public String toString() {
return "key=" + key + ", value=" + value + "";
}
}
}
如何从我的属性映射中访问键值?
How can i access the key value from my properties map?
推荐答案
直到即将到来的 JSF 2.2,
/
不支持 Collection
.它只支持其他List
.
Until the upcoming JSF 2.2, the <h:dataTable>
/<p:dataTable>
doesn't support Collection<E>
. It only supports among others List<E>
.
你需要更换
public Collection<Properties> getProperties() throws Exception{
return properties.values();
}
由
private List<Properties> propertiesAsList;
public List<Properties> getProperties() throws Exception{
return propertiesAsList;
}
并在地图初始化后的某个地方直接执行此操作
and somewhere directly after map's initialization do this
propertiesAsList = new ArrayList<Properties>(properties.values());
(注意:不要在 getter 里面做!)
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