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AngularJS binding between variables

I've got a list of users which I retrieve from my service. When I select any user I can see and edit info (email, roles, etc). The problem is that I don't want these changes to affect user's data in the list, I want to update data only after saving (clicking a button).

Now I'm using two variables:

$scope.selected - currently selected user
$scope.editable - variable for storing the data I'm editing

And I exchange data like this:

$scope.initEditable = function () 
{
    $scope.editable = {};
    $.extend($scope.editable, $scope.selected);
}

Looks like a terrible solution. What is the proper way to do it?

like image 720
ChruS Avatar asked Nov 19 '12 10:11

ChruS


1 Answers

Actually, this is the Angular-way of approaching this problem, you are on the right track. In scenarios like yours one would typically:

  • Copy an item upon selection (edit start) - this is what you do with editable
  • Have 2-way data binding changing a copy (or an original element)
  • Upon edit completion we can propagate changes from a copy to the original

The nice things about this pattern is that we can easily:

  • Offer the 'cancel' functionality where users can revert their changes
  • Be able to compare a copy and the original and drive parts of the UI based on this comparison (for example, we could disable a 'Save' button if there were no changes)

So, I don't think at all that this approach is terrible. The only suggestion I could have is to use angular's angular.copy method instead of $.extend.

like image 139
pkozlowski.opensource Avatar answered Oct 04 '22 21:10

pkozlowski.opensource