Dynamically setting fields[ ] array for List Component

[bomslang]

Hi,

I have a list component, which has a store, model and it's corresponding fields[ ] array.

I am trying to read the data values from a nested json, so I am using custom reader and trying to access data[ ] for store and fieldArray[ ] for fields of model via custom Accessor function.

I have 2 buttons, clicking on each button changes the data of list dynamically ( & of course will change it's fields[ ] as well)

So, basically I need to design a list component for whom data[ ] and fields[ ] will change according to certain actions performed.

Sample Json:-

data[ ] => Actual List Data
fieldArray[ ] => fields for Model of List Store

{
    "success": true,
    "total": 2,
    "data": [
        {
            "id": 1,
            "company": "3m Co",
            "price": 71.72,
            "change": 0.02,
            "pct": 0.03,
            "updated": "9/1/2012"
        },
        {
            "id": 2,
            "company": "Alcoa Inc",
            "price": 29.01,
            "change": 0.42,
            "pct": 1.47,
            "updated": "9/1/2012"
        },
    ],
    "fieldArray": [
        'id',
        'company',
        'price',
        'pct',
        'updated'
    ]
}

PS : One thing that I tried was setting fields returned from custom accessor function on load( ) of list store, but list wasn't getting updated. But at console.log( ) I could see the new fields[ ] array being set.

How to achieve this ?

[jerome76]

Maybe try refreshing the list that's associated with the store?

[bomslang]

That doesn't help.

First of all - Can I do like this ? I mean, I am setting new fields[ ] array for list inside list load( ) event.

Is this correct ? If not, what is the alternative ?

[jerome76]

An alternative would be to use two Models, I think. I've never done what you are explaining here.

[bomslang]

Ok, but what if I had several sets of data.

According to your answer, I could have then hundred's of different model.

What could be the optimal solution ?

Note : I want to have fields[ ] dynamically set at any cost, I can't hard-code them.

[jerome76]

You would need to refill the model with the new records, or use the set method, if you change the fields and reload the store. Changing the fields only changes whats available to use for a record, but it doesn't change any of the instances already created.

I don't know any optimal way of doing this. Maybe someone else does.

I found a link that could help, but its all I could find:
http://stackoverflow.com/questions/10789433/extend-ext-data-model-add-fields-dynamically