what is double(::) in angular js?

Question

While going through some of the angular best practices guide I found this concept of using :: before models for uni-direction binding. But it seems does not work with input field. Here is an example:

https://plnkr.co/edit/gZ73PNGGg4m45zFuBYZw?p=preview

Inside expression it works as expected but inside ng-model, it's still 2-way binding. Then what's the difference?

score 1 · Accepted Answer · answered Aug 21 '16 at 07:08

1

An expression that starts with :: is considered a one-time expression. One-time expressions will stop recalculating once they are stable, which happens after the first digest if the expression result is a non-undefined value (see value stabilization algorithm below).

You can read more about ::

For your requirement, you can just use ng-value

Here is a sample

 <input type="text" ng-model="name">
 <input type="text" ng-value="name">

answered Aug 21 '16 at 07:08

Sajeetharan

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`::exp` will not work for ng-model inside a input box? Because in my example its still updating the `` where as I was expecting that it will not update – Deepak Kumar Padhy Aug 21 '16 at 07:12
@DeepakKumarPadhy No you can't check this sample https://jsfiddle.net/sajeetharan/pw9nct1w/3/ – Sajeetharan Aug 21 '16 at 07:21

what is double(::) in angular js?

1 Answers1