What is entryComponents in angular ngModule?

Question

I am working on an Ionic app ( 2.0.0-rc0 ) which depends on angular 2 . So the new introduction of ngModules is included.

Answer 1

The other answers mention this but the basic summary is:

• its needed when a Component is NOT used inside an html template
• For example when using Angular Material dialog components you use the component indirectly.

Material dialog components are created inside the TS code and not the template:

    const dialogRef = this.dialog.open(MyExampleDialog, { width: '250px' });
  }

This requires you to register it as an entryComponent:

• entryComponents: [MyExampleDialog]

Otherwise you get a error:

• ERROR Error: No component factory found for MyExampleDialog. Did you add it to @NgModule.entryComponents?