ng-value does not update Ng-model

Question

I set the input value Array property sum and it shows value in input but when submitting form does not get Quantity property in Order object. If I change the value then I get Quantity property value. How can I get model value from ng-value?

<input ng-model="Order.Quantity" ng-value="subOrderList.sum('Quantity')" type="number">

why are you using both `ng-model` *and* `ng-value` ? You just need one. — Isaac Vidrine, Jan 07 '19 at 19:11
[See this](https://stackoverflow.com/questions/28717523/whats-the-difference-between-ng-model-and-ng-value) — Isaac Vidrine, Jan 07 '19 at 19:17
Isaac is absolutely right - You set the default value to the property that is bound to the `ngModel` directive from the controller (Or using the `ngInit` directive if you prefer) — Alon Eitan, Jan 07 '19 at 19:17
@AlonEitan I need to get updated value from an array and my array is changing for this reason `ngInit` is not working. — Mohammad Ali Rony, Jan 07 '19 at 19:27

score 0 · Accepted Answer · answered Jan 07 '19 at 22:15

To answer your question, "ng-value does not update Ng-model", it is by design. As mentioned in comments, ng-value and ng-model are not intended to by used in this way.

It isn't entirely clear what you are trying to achieve here, so here's a couple potential solutions:

If you are just looking to display a value then you don't need to use an input at all. Both of these will behave the same and update when needed:

<span>{{subOrderList.sum('Quantity')}}</span>

<span ng-bind="subOrderList.sum('Quantity')"></span>

If you actually need this value to be updated by user input then the HTML would look like this:

<input ng-model="Order.Quantity" type="number">

And then you will need to manually update that value in a controller or service when needed:

Order.Quantity = subOrderList.sum('Quantity');

From your comments it almost seems like you need an input that also changes dynamically and sporadically, but without a data example or more code I can't really see how that would work.

ng-value does not update Ng-model

1 Answers1