我知道我们可以在 Java 中像这样访问 XPage 全局对象
FacesContext facesContext = FacesContext.getCurrentInstance();
ExternalContext externalContext = facesContext.getExternalContext();
...
...
但我无法找到使用 getComponent()
is Java 的任何等效项。 Java中是否有类似于SSJS中的getComponent()
的类或方法?
最佳答案
通过 Java 评估 SSJS 可能是最简单的。来自斯文的代码:
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);
How to call ad hoc SSJS from a Java Bean
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
关于Java 相当于 SSJS 中的 getComponent(),我们在Stack Overflow上找到一个类似的问题: https://stackoverflow.com/questions/14526915/