Difference between [(ngModel)] and [ngModel] for binding state to property?

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Here is a template example:

<input type="number" class="form-control" [(ngModel)]="overRideRate" formControlName="OverRideRate">

<input type="number" class="form-control" [ngModel]="overRideRate" formControlName="OverRideRate">

Here both of them do the same thing. Which one is preferred and why?

AngularJS, with [] syntax, changing the value of the domain model in the component class sets the value in the view. ng-bind. ng-bind works much different than ng-model. ng-bind is one way data binding used for displaying the value inside html component as inner HTML. This directive can not be used for binding with the variable but only with the HTML elements content. Infact this can be used along with ng-model to bind the component to HTML elements.

[ngModel]="currentHero.name" is the syntax for one-way binding, while,

[(ngModel)]="currentHero.name" is for two-way binding, and the syntax is compound from:

[ngModel]="currentHero.name" and (ngModelChange)="currentHero.name = $event"

If you only need to pass model, use the first one. If your model needs to listen change events (e.g. when input field value changes), use the second one.

NgModel, If you have a one-way binding to ngModel with [] syntax, changing the value of the To inspect the properties of the associated FormControl (like validity state),​  This syntax is also known as property binding. Now if the overRideRate property of the input field changes the view automatically will get updated. However if the view updates when the user enters a number the overRideRate property will not be updated. view to model:

It's quite simple [] => component to template () => template to component [(ngModel)] is a contracted form of [ngModel]="currentHero.name" (ngModelChange)="currentHero.name=$event">

More detail here : https://angular.io/docs/ts/latest/guide/template-syntax.html#!#ngModel

Using Two-Way Data Binding, Difference between [(ngModel)] and [ngModel] for binding state to property? Now if the overRideRate property of the input field changes the view automatically  What is the difference between <input [(ngModel)]="name"> and <input [(value)]="name"> They appear to do the same thing. The angular docs are using NgModel but they also say that they replace all the angular1 directives with the "boxed banana" [()]. So why is NgModel still around? What am I missing?

Angular2+ data flow:

In Angular the data can flow between the model (component class ts.file) and view (html of the component) in the following manners:

  1. From the model to the view.
  2. From the view to the model.
  3. Data flows in both directions, also known as 2 way data binding.
Syntax:

model to view:

<input type="text" [ngModel]="overRideRate">

This syntax is also known as property binding. Now if the overRideRate property of the input field changes the view automatically will get updated. However if the view updates when the user enters a number the overRideRate property will not be updated.

view to model:

(input)="change($event)"            // calling a method called change from the component class
(input)="overRideRate=$event.target.value" // on input save the new value in the title property

What happens here is that an event is triggered (in this case input event, but could be any event). We then can call methods of the component class or directly save the property in a class property.

2-way data binding:

<input [(ngModel)]="overRideRate" type="text" >

The following syntax is used for 2-way data binding. It is basically a syntactic sugar for both:

  1. Binding model to view.
  2. Binding view to model

Now something changes inside our class this will reflect our view (model to view), and whenever the user changes the input the model will be updated (view to model).

Difference between [(ngModel)] and [ngModel] for binding state to , [(ngModel)]="overRideRate" is the short form of [ngModel]="overRideRate" (​ngModelChange)="overRideRate = $event". If you have a two-way binding with [()] syntax (also known as 'banana-box syntax'), the value in the UI always syncs back to the domain model in your class. To inspect the properties of the associated FormControl (like validity state), export the directive into a local template variable using ngModel as the key (ex: #myVar="ngModel").

[ngModel] evaluates the code and generates an output (without two-way binding). [(ngModel)] evaluates the code and generates an output and also enables two-way binding.

Difference between [(ngModel)] and [ngModel] for binding , Changes in the application state have been automagically reflected The property binding [ngModel] takes care of updating the underlying  What is the difference between ng-bind and ng-model in AngularJs ng-model. ng-model is used for binding the view to the model.You bind the input fields in the view to the model.Whenever the value in the input field changes,value in the underlying model also changes.It provides two way data binding. We can use ng-model directive in our view as:

Two-way Data Binding in Angular, The ng-model directive in Angular 1.x allows us to create two-way The most common use case for ng-model is binding a text input to a property and so we sorts of information about not only the state of the form such as $dirty <input [(​ngModel)]="myModel.username" type="input" class="form-control"  Difference between Interpolation and Property Binding. Interpolation is a special syntax that Angular converts into property binding. It’s a convenient alternative to property binding. Let’s make the difference clear with an example: In the example below when we need to concatenate strings we have to use interpolation instead property binding.

From ng-model to ngModel, The binding sets the property to the value of a template expression. Enter the value : <input [(ngModel)] ='val'> <br> Entered value is: {{val}} data in Angular and how can we achieve them using the different techniques. The NgModel class has the update property with an EventEmitter instance bound to it. This means we can’t use (ngModelChange) without ngModel.. Whereas the (change) event can be used anywhere, and I’ve demonstrated that above with the [value] property binding instead.

One-way and Two-way Data Binding in Angular, Note: ngModel will try to bind to the property given by evaluating the expression of the model when called with zero arguments, and sets the internal state of a  tosh‘s answer gets to the heart of the question nicely.Here’s some additional information…. Filters & Formatters. ng-bind and ng-model both have the concept of transforming data before outputting it for the user.

Comments
  • [ngModel] - it's property binding only, not two-way binding. So entering new value will not update overRideRate.
  • [(ngModel)] is two way binding that comes from Angular 2. [ngModel] is just for show up.
  • Deprecation alert: in Angular 6, (angular.io/api/forms/FormControlName#use-with-ngmodel) states this: Support for using the ngModel input property and ngModelChange event with reactive form directives has been deprecated in Angular v6 and will be removed in Angular v7. Also see: (stackoverflow.com/questions/50371079/…)
  • sboggs10 The link that you provided refers to combining ngModel with reactive forms, this is not related to the question in almost cases.
  • Here is a good explanation about [(ngModel)], Two-way Data Binding in Angular