Originally posted by suityou01
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Reply to: Create empty typed JSON object?
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Previously on "Create empty typed JSON object?"
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Can you have a separate data structure with a single row of nulls you use as a template?
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Originally posted by suityou01 View PostOwing 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.
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JSON is javascript and javascript is prototype based and supports dynamic typing. Next !
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Originally posted by suityou01 View PostWhy does it matter?
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Originally posted by suityou01 View PostHow can I create an empty typed JSON object in javascript?Originally posted by suityou01 View PostOwing 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.Originally posted by proggy View PostWhat are you using here? .NET ,JAVA, Python ,LISP?
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Originally posted by suityou01 View PostOK. 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.
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Originally posted by proggy View PostYou can't, perhaps JSON isn't the most appropriate notation for your problem?
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.
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Originally posted by suityou01 View PostOK, I'm happy with the typing aspect. The typing aspects don't bother me at all. It is purely semantics as far as this problem is concerned.
What I am after is an empty JSON object, that defines the dimensions of the "array".
If you thought of the JSON object as a humble database table, I can define the columns but not have any rows. That is what I need. A JSON object with only columns.
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Originally posted by proggy View PostI don't think you can mate, you can throw any old stuff into a Json array.
What I am after is an empty JSON object, that defines the dimensions of the "array".
If you thought of the JSON object as a humble database table, I can define the columns but not have any rows. That is what I need. A JSON object with only columns.
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