Using a method (with paramter) as a value?
I'm using JSF 1.2 and am trying to accomplish the following:
Say I have a class, Entity, which has a method:
public String getResult(String name)
In my web page, I'd like to loop through some values for name and display each result in a <h:outputText ...>, using things like 'entity.getResult("foo")' in the value attribute, where foo is one of the names in the list I'm looping through.
Is something like this possible, or would I just be better off building a HashMap or something with the names and results?
Thanks,
Matthew
[580 byte] By [
mrwilsoxa] at [2007-10-3 1:45:32]
JSF doesn't do that out-of-the-box. There is a custom EL-Resolver library at
http://el-functors.sourceforge.net/
that lets you do it.
Otherwise, you can wrap it in a bean where you set the parameter ("foo") then get the result with a no-arg method.
To set the parameter, you can either bind it to an input field, or explicitly use a jsp:setProperty tag.
Isn't an option to collect the data in a List and use the h:dataTable to display them in a table?
Check http://balusc.xs4all.nl/srv/dev-jep-dat.html how to use datatables.
Anyway, if this isn't an option, then use f:attribute:
JSF<h:outputText id="myId" value="#{myBean.text}"><f:attribute name="text" value="blah" /></h:outputText>
MyBeanpublic String getText() {
UIComponent component = FacesContext.getCurrentInstance().getViewRoot().findComponent("myId");
String text = (String) component.getAttributes().get("text");
return text;
}
This will show "blah" in the outputText. Of course you can use this to fill in the virtual param of getRequest().
Nice idea with the f:attribute, but it won't actually work within a "c:forEach" loop.
Firstly, "myId" will need the ids of any naming containers pre-pended (eg, in a form with id "myform", it becomes "myform:myid").
Secondly, the "myId" will be augmented each time round the loop, so the id will be "myform:myid", "myform:myidj_id_1", "myform:myidj_id_2".
If you invoke
viewRoot.findComponent("myform:myid");
you will always get the first value only.
You need some other way of getting a reference to the component from which the expression is being evaluated.
Ur right. But h:dataTable is a better solution I guess. Looping through the results sounds like tabular data.
Another way to use f:attribute anyway:
JSF<h:outputText binding="#{myBean.textElement}" value="#{myBean.textValue}">
<f:attribute name="text" value="blah" />
</h:outputText>
MyBeanprivate HtmlOutputText textElement;
public HtmlOutputText getTextElement() {
return textElement;
}
public void setTextElement(HtmlOutputText textElement) {
this.textElement = textElement;
}
public String getTextValue() {
return (String) textElement.getAttributes().get("text");
}
Untested in a foreach loop though.
Of course, if you use a "binding" on your component, then you will be able to get to the attributes directly. Something like
<h:outputText binding="#{myBean.theOutput}" value="#{myBean.text}">
<f:attribute name="text" value="blah" />
</h:outputText>
Then in your bean you need a "UIOutput" property called "theOutput", and then the "getText" method can look like this:
public String getText() {
String text = (String) getTheOutput().getAttributes().get("text");
return "Got " + text;
}
LOL, I've edited my msg at the same time ;)
