Is there any way to access observableArray by index without arr()[index]?

[realYukiko]

I am sorry I can't find any issue about this problem. If there was, please tell me. Thanks very much : ).

My problem is that I want to get the item from an observableArray by index, and when in the html, just like data-bind=“with:ColumnInfo()[Index]”, the array could not update after having modified the value of array item. I think the reason may be that ColumnInfo()[Index] is not longer an item belongs to ColumnInfo.

I wonder if there is a way to get Item from observableArray by index. Now that foreach can read and change the observableArray, why not index?

[mbest]

Please provide an example of code that you want to use that isn't working right.

[realYukiko]

Thanks. @mbest
So it's not recommended to get an item from observableArray by index?

[mbest]

I don't really understand what problem you are seeing.

[Iiridayn]

@JSAL- are you asking about a specific index bound in the HTML, such as data-bind="with: ColumnInfo()[3]", and concerned that if index 3 is dropped and re-added into the array, the data-bind wouldn't update, since it was bound to a specific object?

I suspect that the with would catch the observable array access and update when the array changes - nor am I sure I would build my front end with specific index references into an observable array.

That said, (assuming something like with: ColumnInfo()[3]) you could easily implement that as a pureCompued. In your view model, self.nameColumn = ko.pureComputed(function() { return self.ColumnInfo()[3]; }); - however, I'm fairly confident that's essentially exactly what knockout does internally.