Angular Project structure and default component

In my previous blog we learnt how to setup angular project and run default app which created by angular cli. In this blog we will learn how to set up own home page and routing. Before this lets have a look on project structure :

above project structure is being created by default when we create angular app . There are many folders and files but since we are in very begining stage so we will focus only src folder. When you expand the src folder you will see below folder and files :

Lets expand src->app folder and understand this :

in app folder we have : 1. app-routing.module.ts : it handles routing for app ,for now we need to have little knowledge of this module ,later we will learn in details. In angular we create components like *.component.html -for our template file and *.component.ts for our typescript file. Since our focus is more on practical so I am not going in details about these. If you want you can follow the angular site. So when we need to add any template file(file which contains html code ) we create template. when we create component automatically 4 files gets created as you can see in above screen shot :

1. app.component.html (for html code) 2.app.component.css (for template specific styling) 3.app.component.ts (for typescript code) and app.component.spec.ts(here we will leave this for now just to avoid confusion). So our main focus will be on three component files.

As app.component is our home page so it loads inside the index.html :

<app-root> is the selector of app component ,if you open app.component.ts file you can see this. which has reference of app.component.html for template and app.component.html .css files

Here we should know that when we create any component/services/modules/packaged , cli automatically import these to app.module.ts . so if you open app.module.ts , our all component’s should be imported. Basically app.module should be having all the reference

now it time to create our first component and load it instead of having default page :

I am going to delete everything from app.component.html . I will save this file and browse http://localhost:4200/ . I should see blank page .

Now you write <header>  Hello this is my first angular app</header>

and hit ctrl+s and see in browser ,we should see our changes in default component

in next lesson we will learn how to add new component and routing.  Thanks ..

Comments

Post a Comment

Popular posts from this blog

Create Reactive form in angular

Image
  In angular we can create two types of forms 1. Reactive form 2.template based form In Reactive form  : all the codes handle in type script , no need to use ngModel to get and set value in control. we define form and formcontrolname for each control , and through formControl we get and set value .reactive form code is neat and clean when we have more complex structure or validation we should use reactive form . Template driven  : data binding is done via ngModel ,generally we can use this approach for simple form ,in this approach code became messy and very difficult to manage . Also in this approach difficult to handle all validation ,need more coding. So , I like to go with Reactive form approach instead of Template based. In our tutorial all forms will be reactive , but we can use both approach if required. I am going to create employee form which will have below fields : Employee Id ,Employee Name, email Id,Mobile Number,Password etc.. our final output will be as below : Employee
Read more

Create Angular project step by step

Image
    Dear Readers, This tutorial covers : Preparation of environment Creation of First angular project Run the default generated angular project creation of best architecture of project call apis with Http Create services for http call, error handling etc. Registration and login with JWT toke decode token and get data from token                                        I believe the good way to learn anything new is to do more practical instead of theory . So after a short description will go straight for practical. Lets see what is angular and why to use  : Angular is a JavaScript based application design development framework for creating SPA(single page applications). Its a framework means it provides us all the required elements which are needed to develop a SPA. To understand more details kindly follow the  https://angular.io/docs  . Preparation of environment : In order to start angular development we need to install some software as below : Node.js : can be installed latest version
Read more