[OmniFaces utilities] The
getParams() returns an unmodifiable map with all request query string or view parameters, appended with all child UIParameter components (<f|o:param>) of the given parent component. Those with disabled=true or an empty name or an empty value are skipped. The <f|o:param> will override any included view or request parameters on the same name.Method:
See also: Servlets.getRequestQueryStringMap() | Faces.getViewParameterMap() | Components.getParams()
Usage:Let's suppose that we have the following page:
<f:metadata>
<f:viewParam name="playernameparam" value="#{playersBean.playerName}"/>
<f:viewParam name="playersurnameparam" value="#{playersBean.playerSurname}"/>
</f:metadata>
<h:head>
<title></title>
</h:head>
<h:body>
<h:panelGrid columns="2">
<h:form id="form">
<h:commandButton id="submit" value="Get all params" action="#{playersBean.allParams()}">
<f:param name="ageParam" value="29"/>
<o:param name="playParam" value="left"/>
</h:commandButton>
</h:form>
</h:panelGrid>
</h:body>
Further, we can use the Components#getParams()utility to programmatically collect the UIParameters (<f|o:param/>) nested in the above <h:commandButton/> and the view parameters. This can be accomplish in different JSF artifacts; for example, in a bean (obviously, there are several ways to identify the parent UIComponentof the UIParameters that we want to collect - the UIComponentthat should be passed to the #getParams()should be obtained in a convenient manner depending on your circumstances; below, we simply used the Components#findComponent()utility):
import org.omnifaces.util.Components;
...
public void allParams() {
UIComponent uc = Components.findComponent("form:submit");
Map<String, List<String>> paramsMap = Components.getParams(uc, false, true);
for (Map.Entry<String, List<String>> entry : paramsMap.entrySet()) {
System.out.println("Param: "+ entry.getKey() + "/" + entry.getValue());
}
}
Let's suppose that we start the application with an URL like this:
http://myapp/?playernameparam=rafael&playersurnameparam=nadal
After we press the Get all params button the server log will reveal the following output:
Param: playernameparam/[rafael]
Param: playersurnameparam/[nadal]
Param: ageParam/[29]
Param: playParam/[left]