javascript - Angular 2 ngModel Not Binding Object Property Defined In Class Definition - Stack Overflow

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I am new to angular 2, I tried [(ngModel)] as shown below.

import { Component } from '@angular/core';

@Component({
  selector: 'my-app',
  template: `<input [(ngModel)]="model.name" name="name"> <h1>{{model.name}}</h1>`
})
export class AppComponent  { 
constructor() {
}
model = {name: "some value"};
}

The above code produces output like shown below on initial load of web page in browser..

The second one is..

import { Component } from '@angular/core';

@Component({
  selector: 'my-app',
  template: `<input [(ngModel)]="model.name" name="name"> <h1>{{model.name}}</h1>`
})
export class AppComponent  { 
constructor() {
}
model = {};
model.name = "some value";
}

This one produces following output..

Please Kindly Explain Difference Between Two Code Samples and Why It's Not Working in Second Sample..

Thanks In Advance.

I am new to angular 2, I tried [(ngModel)] as shown below.

import { Component } from '@angular/core';

@Component({
  selector: 'my-app',
  template: `<input [(ngModel)]="model.name" name="name"> <h1>{{model.name}}</h1>`
})
export class AppComponent  { 
constructor() {
}
model = {name: "some value"};
}

The above code produces output like shown below on initial load of web page in browser..

The second one is..

import { Component } from '@angular/core';

@Component({
  selector: 'my-app',
  template: `<input [(ngModel)]="model.name" name="name"> <h1>{{model.name}}</h1>`
})
export class AppComponent  { 
constructor() {
}
model = {};
model.name = "some value";
}

This one produces following output..

Please Kindly Explain Difference Between Two Code Samples and Why It's Not Working in Second Sample..

Thanks In Advance.

• javascript
• angular
• typescript
• angular2-ngmodel

Share Improve this question Follow edited Nov 25, 2016 at 11:22 eko 40.7k1111 gold badges7878 silver badges101101 bronze badges asked Nov 25, 2016 at 11:01 Yuvaraj VYuvaraj V 1,21233 gold badges1919 silver badges2828 bronze badges

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1 Answer 1

Sorted by: Reset to default 3

Because you can't do assignments there. You can move the assignment into the constructor or to any other life-cycle method:

import { Component } from '@angular/core';

@Component({
  selector: 'my-app',
  template: `<input [(ngModel)]="model.name" name="name"> <h1>{{model.name}}</h1>`
})
export class AppComponent  { 
constructor() {
   this.model.name = "some value";
}
model = {};

}

Also if you look at your transpiled js file you will see something like:

function AppComponent() {
      this.model = {};
      this.name = "some value";
}

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