Create empty typed JSON object?

[suityou01]

You can't, perhaps JSON isn't the most appropriate notation for your problem?

OK. The problem domain is this :

Client wants Grids on a form. The Grids represent hierarchical data. It must be possible to manipulate the Grids (add and delete parent and child rows) without persisting any data to the database tables until the form is submitted.

So this means I have to maintain a DataTable per grid in memory.

There is some GUI logic that says if the "Count" column of the Parent row does not have the correct number of child records then prevent form submission and display some client side validation.

Owing to the constraints of the BPM framework, this can only be done on the client side. So I need to effectively keep a client side copy of the DataTable.

JSON looked like a good approach. If you have to create JSON objects prepopulated with garbage then I agree, they are not what I need.

What would be a better client side technology? I wanted to stay away from basic arrays. JSON had lots of cool stuff baked in to decorate the columns with constraints which I liked.

[proggy]

OK. The problem domain is this :

Client wants Grids on a form. The Grids represent hierarchical data. It must be possible to manipulate the Grids (add and delete parent and child rows) without persisting any data to the database tables until the form is submitted.

So this means I have to maintain a DataTable per grid in memory.

There is some GUI logic that says if the "Count" column of the Parent row does not have the correct number of child records then prevent form submission and display some client side validation.

Owing to the constraints of the BPM framework, this can only be done on the client side. So I need to effectively keep a client side copy of the DataTable.

JSON looked like a good approach. If you have to create JSON objects prepopulated with garbage then I agree, they are not what I need.

What would be a better client side technology? I wanted to stay away from basic arrays. JSON had lots of cool stuff baked in to decorate the columns with constraints which I liked.

What are you using here? .NET ,JAVA, Python ,LISP?

[suityou01]

How can I create an empty typed JSON object in javascript?

Owing to the constraints of the BPM framework, this can only be done on the client side. So I need to effectively keep a client side copy of the DataTable.

What are you using here? .NET ,JAVA, Python ,LISP?

Why does it matter?

[Spacecadet]

Why does it matter?

Because he doesn't understand what you're asking

[proggy]

Why does it matter?

Sorry I read grids on a form and thought it was some windows client, my mistake sorry. I'm out of ideas I would do as jmo1 suggests and ask on StackOverflow.

[suityou01]

Because he doesn't understand what you're asking

Now now.

[proggy]

Now now.

I'm busy so just scanned it, missed the part you mentioned this is a web app. I am so sorry. Because of that I will only charge half a days rate.

[DimPrawn]

And he's back databinding to nested arrays........

[suityou01]

And he's back databinding to nested arrays........

No, no I'm not. The grids are bound to Datatables.

Did you read the thread at all.

[fullyautomatix]

JSON is javascript and javascript is prototype based and supports dynamic typing. Next !