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Re: Follow up on Rule Modeler and Repetitions
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Re: Follow up on Rule Modeler and Repetitions


  • Subject: Re: Follow up on Rule Modeler and Repetitions
  • From: Ramsey Lee Gurley <email@hidden>
  • Date: Fri, 14 Aug 2009 08:32:07 -0400

Hi Dan,

You can use the D2WCustomComponent anywhere in your inspect page where you can use a property level component really. Take your rule for instance,

(task = "inspect" and entity.name = "MyEntity" and propertyType = "r" and smartRelationship.isToMany = '1') => componentName = D2WCustomComponent

Now, you can look in the WO for D2WCustomComponent located at

/System/Library/Frameworks/JavaDirectToWeb.framework/Resources/ D2WCustomComponent.wo/

and see that is is a very simple component wrapper. It uses the customComponentName binding to attach whatever component you would like. Additionally, it will hand your component two other bindings: object and key. So, to use it, you need another component... something similar to what I included in the last email perhaps... and a rule to reference that component. So let's say that component is MyDisplayBrowser.wo, you'd need a second rule like

(task = "inspect" and entity.name = "MyEntity" and propertyType = "r" and smartRelationship.isToMany = '1') => customComponentName = MyDisplayBrowser

So, when the page gets to MyEntity's relationship properties, it will insert a D2WCustomComponent using the first rule, and the D2WCustomComponent will insert MyDisplayBrowser using the second rule. Of course, since you are building a component already, you could simply descend from ERD2WComponent and skip the middleman.

The tutorial sounds like a good idea and it looks nice so far. New material that guides people down the D2W path will certainly be a welcome addition.

Ramsey


On Aug 14, 2009, at 12:05 AM, DANIEL BEATTY wrote:

Greetings Ramsey,
Well I was there for David's talk at WOWODC west. There were a few things that I did not catch. This had to do with how he was displaying the results of to-many relationships, and pop ups of to- one relationships.


I was using WOBrowser as just an example of a repetition based component. Now I have to admit I still have a bit of confusion here about D2WCustomComponent.

First, is it possible to insert such a custom component into an existing edit or inspect task by rule, and if so what rule sequence allows this? Can it be applied to a to-many relation so that a table like structure appears instead of a "Cheap copy" of a mutable array tag?

To help me answer these questions, I am building a little toy example to ensure that I gain understanding of the possible uses of these custom components. This toy example is described at http://venus.cs.ttu.edu/groups/webobjects/wiki/761ea/Direct_To_Web_Tutorial.html . It is a work in progress. Furthermore, would anyone like to help coach and guide me in finishing this example? I would like to make it available for community benefit when finished.

Thank you,
Dan


On Aug 13, 2009, at 6:24 PM, Ramsey Lee Gurley wrote:

I don't think you're going to find a plethora of components to - display- a list using a WOBrowser. Being a form control, it implies submitting a value. Using it outside of a form is completely non standard and counter intuitive to end users. The only standard components that use it which I'm aware of are query and edit components. Perhaps you might like a table or scrollable ul? [Sorry, I live to validate ;-)]

That said, if you have to use a WOBrowser, I would suggest watching David LeBer's podcast from WOWODC 09 demonstrating the use of the D2WCustomComponent. You can use that to insert a component that has a WOBrowser in the HTML, 'object' and 'key' bindings, and a method to fetch your to-many list using kvc addtions... Something like

----HTML
<webobject name="Browser"/>

---WOD
Browser: WOBrowser {
	list = list;
	item = item;
	displayString = item.userPresentableDescription;
}

----Java
public Object object;
public String key;
public Object item;

public NSArray list() {
return (NSArray)NSKeyValueCodingAddtions.Utility.valueForKeyPath(object, key);
}


Ramsey

On Aug 13, 2009, at 12:46 AM, Daniel Beatty wrote:

Greetings all,
This may be a David (LeBer or Holt question). How does one active the WO Browser effect in the inspect task for to-many relations? My first guess would be the Rule Modeler, but I get stuck after establishing a LHS of
(task = "inspect" and entity.name = "MyEntity" and propertyType = "r")


I am pretty sure there was a fourth option about (smartRelationship.isToMany = 1) , but I still get stuck as to what to put on the RHS.

I tried componentName = WOBrowser but this fails since it is needing the keys for list and item assigned, and I am not sure where to stick that. The other thought was to use pageName to identify a custom inspection component. At which, point I get stuck on the nextPageDelegate method.

Would some folks from the audience shed some light and help lead to a better understanding of this great D2W mystery?

Thank you,



Dan Beatty, M.S. CS (B.S. EECS)
Ph.D. Student
Texas Tech University
email@hidden
http://venus.cs.ttu.edu/~dabeatty
http://web.me.com/danielbeatty/My_Home_Page/Welcome.html
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Dan Beatty, M.S. CS (B.S. EECS) Ph.D. Student Texas Tech University email@hidden http://venus.cs.ttu.edu/~dabeatty http://web.me.com/danielbeatty/My_Home_Page/Welcome.html








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References: 
 >Follow up on Rule Modeler and Repetitions (From: Daniel Beatty <email@hidden>)
 >Re: Follow up on Rule Modeler and Repetitions (From: Ramsey Lee Gurley <email@hidden>)

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