In angularJS 4, from which file index.html file is called ?

As angualr4 is component based. components are created/developed in angular4 web application.

 

When you create new application it will create app.component.ts by default and in component decoration, there is an app-root selector(you can define your custom selector) which is defined in index.html.

 

So we can say that app.component is the file which is called by index.html.

 

You can change the default page to show by replacng selector of your component in index.html 

 

For more details I recommend you to review this: https://angular.io/tutorial/toh-pt5

 

Hope this will help you..! 

index.html is the default page. When you create a new project, you can find this in index.html

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The tag is the name of the selector of the default app.component.ts file, so this is the app component which be called.

You can change the default page to show by replacing by the selector of your component in the index.html, or you can create a router to redirect to your component, I advise you to follow this tutorial : https://angular.io/docs/ts/latest/tutorial/toh-pt5.html