Not rendering create button(solved)

Question

Dear JHeadstart team,
I'm on JHeadstart 10.1.3.1.26 and
Jdeveloper 10.1.3.2.1
I have a parent Product (key is id) and a child Appeal with foreign key the product_id.
I'm using a form layout. If checkmarked the Single-row insert allowed property.
The functionality I would like to have is that if no row is found in the Appeal table(product_id) that the insert row button is rendered and if an Appeal row is found that the insert button is not rendered.
I also can use a table layout but I don't know of an EL expression which helps me with my situation.
Some help would be appreciated.
Also a good EL tutorial/overview would be helpful to me.
I found this one: http://download-uk.oracle.com/docs/html/B25947_01/appendixb001.htm
and this one:
http://developers.sun.com/docs/jscreator/help/2update1/jsp-jsfel/jsf_expression_language_intro.html#syntax
but they are to theoretical for me.
thanks in advance,
Marcel.
Message was edited by:
MarcelM

Answer 1

Hi Steven,
I've tried your suggestion.
I've put the EL #{!((bindings.RecensieAanvraagIterator.currentRowIndexInRange!=-1 and bindings.RecensieAanvraagIterator.findMode!='true'))} in the 'Insert allowed EL Expression' property. This generates the input button. But when I press the button, the form is completely read-only.
The functionality i want is that for, the "RecensieAanvraag" table, I can add one row or update this row when the insert is committed. Or update an already existing row from this table. This table has a foreign key ProdId and is the child of Product table in the form layout.
I've tried a lot of EL possibilities in both the 'Insert allowed EL Expression' and 'update allowed EL Expression' properties but without any luck (I don't have the complete understand for these properties although I've read the JHeadstartDevGuide RELEASE 10.1.3 (october 2006).pdf.).
May be you can point me in the right direction?
And perhaps you know of a good tutorial about EL which I don't know of?
regards,
Marcel