我知道我们可以在 Java 中像这样访问 XPages 全局对象
FacesContext facesContext = FacesContext.getCurrentInstance();
ExternalContext externalContext = facesContext.getExternalContext();
...
...
但我找不到任何等效的使用getComponent()是 Java。getComponent()Java中是否有与SSJS相似的类或方法?
在 Java 中评估 SSJS 可能是最简单的。斯文的代码:
String valueExpr = "#{javascript: getComponent('xxx').getValue();}";
FacesContext fc = FacesContext.getCurrentInstance();
ExpressionEvaluatorImpl evaluator = new ExpressionEvaluatorImpl( fc );
ValueBinding vb = evaluator.createValueBinding( fc.getViewRoot(), valueExpr, null, null);
vreslt = (String) vb.getValue(fc);
这是 Karsten Lehmann 的纯 Java 解决方案:
/**
* Finds an UIComponent by its component identifier in the current
* component tree.
*
* @param compId the component identifier to search for
* @return found UIComponent or null
*
* @throws NullPointerException if <code>compId</code> is null
*/
public static UIComponent findComponent(String compId) {
return findComponent(FacesContext.getCurrentInstance().getViewRoot(), compId);
}
/**
* Finds an UIComponent by its component identifier in the component tree
* below the specified <code>topComponent</code> top component.
*
* @param topComponent first component to be checked
* @param compId the component identifier to search for
* @return found UIComponent or null
*
* @throws NullPointerException if <code>compId</code> is null
*/
public static UIComponent findComponent(UIComponent topComponent, String compId) {
if (compId==null)
throw new NullPointerException("Component identifier cannot be null");
if (compId.equals(topComponent.getId()))
return topComponent;
if (topComponent.getChildCount()>0) {
List childComponents=topComponent.getChildren();
for (UIComponent currChildComponent : childComponents) {
UIComponent foundComponent=findComponent(currChildComponent, compId);
if (foundComponent!=null)
return foundComponent;
}
}
return null;
}
http://www.mindoo.com/web/blog.nsf/dx/18.07.2009191738KLENAL.htm
在扩展库的组扩展中有一个查询包,其中包含 XspQuery 类和一些过滤器。此类旨在像 dojo.query 一样为您提供许多不同的方法来查找组件,不仅通过 id,还通过 Component Class、Client ID、Server ID 等。这是使用服务器 ID 的示例定位一个组件:
XspQuery query = new XspQuery();
query.byId("someId");
List<UIComponent> componentList = query.locate();
Group 扩展从未与扩展库一起分发,而是在 svn 存储库中,要获得它,您必须通过 OpenNTF svn 服务器。