RE: Change valueBinding of t:dataTable based on condition

[Rønnevik, Eivind <ei...@kadme.com>]

Your suggestion worked :)

I was on to it myself, but guess I mixed up a bit with my string-representation.. ;)

Thanks for sorting it out!

-----Original Message-----
From: Mike Kienenberger [mailto:mkienenb@gmail.com] 
Sent: 31. mai 2007 15:49
To: MyFaces Discussion
Subject: Re: Change valueBinding of t:dataTable based on condition

Your  understanding of value binding syntax is incorrect.

Try this:

<t:dataTable value="#{myBean.boolean ? oneBean.dataModel :
anotherBean.dataModel}"

I can't think of any reason why this won't work.

On 5/31/07, Rønnevik, Eivind <ei...@kadme.com> wrote:
>
>
>
>
> Hi!
>
>
>
> I was just curious, is there any way I can change the value of a dataTable
> based on different conditions?
>
>
>
> I'll try to give a simple example to explain what I want. :)
>
>
>
> Let's say I use the graphicImage tag, in the value property I could either
> write the path to the image
>
> <t:graphicImage value="/images/myImage.gif"
>
> Or I can use an expression that returns a String pointing to the image
>
> <t:graphicImage value#{myBean.pathToImage}"
>
>
>
> I have the need of using the same jsp twice, but based on a boolean property
> the datasource for the dataTable on this page would differ.
>
>
>
> Theoretically, this way of setting the value-property would represent what I
> would want to do:
>
>
>
> <t:dataTable value="#{myBean.boolean ? '#{oneBean.dataModel}' : '#{
> anotherBean.dataModel}'}"
>
>
>
> This would work if the value property expected a String, but instead it
> expects an expression that directly points to a collection of some sort.
>
>
>
> I also tried to point to a method in my bean that returns the correct
> value-string based on the Boolean:
>
>
>
> <t:dataTable value="#{myBean.tableValue
>
>
>
> where the getTableValue-method is like this:
>
>
>
> public String getTableValue()
>
> {
>
>             if(condition)
>
>                   return "#{oneBean.dataModel}";
>
>             return "#{anotherBean.dataModel}";
>
>
>
> }
>
>
>
> But of course this fails since the dataTable expects a collection and not a
> String.
>
>
>
>
>
>
>
> I know that I in my getTableValue-method can return the proper collection:
>
>
>
> public DataModel getTableValue()
>
> {
>
>             if(condition)
>
>                   return getOneBean().getDataModel();
>
>             return getAnotherBean().getDataModel();
>
>
>
> }
>
>
>
> but then I would have to set the references to these other beans, and I
> can't do that because it would cause a cyclic reference..
>
>
>
> So, are there other solutions to this or do I have to rethink my way of
> doing this? :)
>
>
>
> Regards,
>
>
>
> Eivind