Feature: ngTrueValue should accept non-string values

[coli]

For ng-model checkboxes, ngTrueValue only supports string. It should really just accept an angular expression and eval to get the value so it supports say a js object.

[btford]

I'm not entirely sure of the purpose of ngTrueValue, except that it seems like a convenience directive for adding watches to a controller for one case. I suspect that if you want to set some model to a complex value, it might be cleaner to put a $scope.$watch on your checkbox's model and modify a model on the scope accordingly.

@coli, do you have a specific use case in mind? @IgorMinar, @mhevery, @vojtajina, what do you guys think?

[coli]

Use case is fairly common actually:

I have a array of say category objects in say $scope.categories=[{id:5,name:"First"},...}

Then I have a selectedCategories array that contains a subset of those categories.

I want to show a checkbox for some categories(paging), and when you check or uncheck the checkbox, selectedCategories is changed.

I actually wrote a directive that will overwrite the default checkbox behavior to add support for the above. I can share the code if needed.

[coli]

My usage ended up like this, keyField was needed to do object comparison as in my case, selected group object and group object could be slightly different initially (they came from 2 different backend API)

<ng-repeat="group in groups>
    <input type='checkbox' ng-model="selectedArray" ng-true-value="group" mi-checkbox="{keyField:'id'}">
</>

[jamiedgordon]

Heck, I have a far simpler use case that I was disappointed to discover doesn't work - I need an integer, rather than string!

[scyros]

I'm using a template to render a checkbox control. In this case i cannot know the true value, that value depends on specific control information i want to render.

[adamsch1]

I too would prefer that ng-true-value be an expression. If your number of checkboxes is determined at run time you have to resort to scope methods with timeout wrappers.

[arselvam]

+1. Support expression in ng-true-value

[redbarmaley]

+1 Support integer in ng-true-value

[mogadget]

+1 for expression instead of string

[ilmotta]

+1 Support expressions!

[brab]

+1 for expressions

[marcospassos]

+1 Support objects:

<div ng-repeat="group in groups">
    <input type='checkbox' ng-model="array[$index]" ng-true-value="group" />
</div>

[brab]

@coli would you mind sharing the directive you wrote? It would be a great help to me while this is issue is still being considered. Maybe in a gist?