How to Use Forms in Angular 2 passing complex data objects between pages

Hi everybody!

Today we are going to explain how to pass form data object like a complex object between pages in Angular 2 or 4 or 5.

First of all, we have to declare our Data object like an injectable, on this way:

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

@Injectable()
export class Data {
    public storage: any;
    public constructor() { }
}

Then, we have to declare our Data object like a provider in our ngModule class file configuration, on this way:

@NgModule({
    declarations: [AppComponent, ...appComponents],
    bootstrap: [AppComponent],
    imports: [
        NativeScriptModule,
        NativeScriptRouterModule,
        NativeScriptRouterModule.forRoot(appRoutes)
    ],
    providers: [Data]
})
class AppComponentModule {}

Then we can use this Data object in our pages.

First of all, we are going to define this in our first page, the origin one:

public constructor(private router: Router, private data: Data) {}

public navigationToPage2() {
   this.data.storage = {
        "firstname": "Nic",
        "lastname": "Raboy",
        "address": {
            "city": "San Francisco",
            "state": "California"
}
   }
   this.router.navigate(["page2"]);
}

And then, we will get the Data object in our second page, which receive the request of our form POST:

public constructor(private data: Data) {
    console.log(JSON.stringify(this.data.storage));
}

Only we need now is to pass our form to the this.data.storage like a JSON file on this way:

this.data.storage = {
    "requestData": JSON.stringify(requestData)
};

And the get the Data on the second page this way:

console.log(this.data.storage.requestData);

I hope you have found it useful and that you have solved your problems.

Try it and have fun!

What to do for Convert your App into a Progressive Web App

Hi,

I'm going to explain what to do for Converting your App into a Progressive Web App. Or what's the same, for using Service Workers.

Here you can see the demo of a Progressive Web App with Service Workers.

It's very easy.

You have to use Angular/Cli in your Angular App and do the next three steps:

- First, you have to change your Angular/Cli config file and add the next line:

{
"apps": [
{ "serviceWorker": true } ]
}

- Second, you have to install the Service Workers dependency:

npm i @angular/service-worker --S

- And finally, you have to add the external links from your index.html for use the cache on them, modifying the generated file ngsw-manifest.json:

"external": {

"urls": [

{"url": "https://maxcdn.bootstrapcdn.com/bootstrap/3.3.7/css/bootstrap.min.css"},

{"url": "https://cdn.rawgit.com/konpa/devicon/4f6a4b08efdad6bb29f9cc801f5c07e263b39907/devicon.min.css"},

{"url": "https://fonts.googleapis.com/icon?family=Material+Icons"},

{"url": "https://cdnjs.cloudflare.com/ajax/libs/font-awesome/4.7.0/css/font-awesome.min.css"}

]

},

And that's all!

Try it and have fun!

How to configure Reactive Forms in your Angular Application?

Hey people!

Today I'm going to explain how to configure your Angular application to use Reactive Forms and how to implements your first form.

First of all, you have to install the forms module in your project:

npm install @angular/forms --save

Then, you have to modify your app.module.ts adding:

import { FormsModule, ReactiveFormsModule } from '@angular/forms';

@NgModule({

imports: [ BrowserModule, ReactiveFormsModule ], 

declarations: [ AppComponent ], 

bootstrap: [ AppComponent ]

})

On this point, your project is prepared for using Reactive Forms.

The you have to modify the form component you want to use:

<div class="container">
  <h1>Add user</h1>
  <form [formGroup]="myForm" novalidate (ngSubmit)="save(myForm.value, myForm.valid)">
    <div class="form-group">
      <label for="">Name</label>
      <input type="text" class="form-control" formControlName="name">
      <small [hidden]="myForm.controls.name.valid || (myForm.controls.name.pristine && !submitted)" class="text-danger">
            Name is required (minimum 5 characters).
          </small>
      <!--<pre class="margin-20">{{ myForm.controls.name.errors | json }}</pre>-->
    </div>
    <div class="form-group" formGroupName="address">
      <label for="">Address</label>
      <input type="text" class="form-control" formControlName="street">
      <small [hidden]="myForm.controls.address.controls.street.valid || (myForm.controls.address.controls.street.pristine && !submitted)" class="text-danger">
            Street required
          </small>
    </div>
    <div class="form-group" formGroupName="address">
      <label for="">Postcode</label>
      <input type="text" class="form-control" formControlName="postcode">
    </div>
    <button type="submit" class="btn btn-default">Submit</button>
    <div class="margin-20">
      <div>myForm details:-</div>
      <pre>Is myForm valid?: <br>{{myForm.valid | json}}</pre>
      <pre>Is myForm submitted?: <br>{{submitted | json}}</pre>
      <pre>myForm value: <br>{{myForm.value | json}}</pre>
    </div>
    <div class="margin-20">
      Form changes:
    </div>
    <div *ngFor="let event of events" class="margin-20">
      <pre> {{ event | json }} </pre>
    </div>
  </form>
</div>

With the typescript file of the component with the changes:

public myForm: FormGroup;
public submitted: boolean;

...

constructor(private _fb: FormBuilder) { }

...

ngOnInit() {

        // the short way

        this.myForm = this._fb.group({

            name: ['', [<any>Validators.required, <any>Validators.minLength(5)]],

            address: this._fb.group({

                street: ['', <any>Validators.required],

                postcode: ['8000']

            })

        });

}

...

save(model: User, isValid: boolean) {
        this.submitted = true;
        console.log(model, isValid);
}

You can develop your forms in many way.
Use which is more easy for you.

Try it and have fun!

Keys for configure Bootstrap 3 in Angular 4 Project!

Hi,

Today, I'm going to explain the steps for configure Bootstrap in an Angular application.

First of all, we have to add Bootstrap in our application with:

 > npm install --save ngx-bootstrap@latest  

Then, we have to open the index.html file and add:

<link

rel="stylesheet"

href="https://maxcdn.bootstrapcdn.com/bootstrap/3.3.7/css/bootstrap.min.css" />

Then, we have all we need for use Bootstrap 3 in Angular 4.

Now, we have to configure all the html files following the structure:

<div class="row">

<div class="col-xs-12 col-sm-6 col-lg-3">

...

</div>

... (any repeations you need)

</div>

You have to know that any div with class col-**-** need a parent div with class row.

Also, you have to know that col-xs is for mobiles dispositive, col-sm for tablets dispositives and col-lg for computer dispositive.

Here you have the documentation of the Bootstrap 3 style; All you need is here:

http://getbootstrap.com/css/

When you domain all this css styles, you can improve new approach for your develops.

Try it and have fun!

How to migrate an Angular 2 Project to Angular 4?

Hi people,

Angular is growing ;) and now we have to migrate it to be updated!

The steps to upgrade to angular 4 are as follows:

First of all verify the Node Version:

> node -v

To actualice the version download it from: https://nodejs.org/en/download/

Then, we are going to actualice angular/cli:

First, we have to remove the actuals possibles versions:

> npm uninstall -g @angular/cli

> npm uninstall -g @angular-cli

Then, we are going to install it again:

> npm install -g @angular/cli

Then, verify the versions installed:

> ng -v

It must shows something like this:

    _                      _                 ____ _     ___ 
   / \   _ __   __ _ _   _| | __ _ _ __     / ___| |   |_ _|
  / △ \ | '_ \ / _` | | | | |/ _` | '__|   | |   | |    | | 
 / ___ \| | | | (_| | |_| | | (_| | |      | |___| |___ | | 
/_/   \_\_| |_|\__, |\__,_|_|\__,_|_|       \____|_____|___|
               |___/                                        
@angular/cli: 1.0.0                                  
node: 6.10.2                                              
os: win32 x64 

Then, goes to the Project directory and actualice the @angular version:

In Windows PC:

npm install @angular/common@next @angular/compiler@next @angular/compiler-cli@next @angular/core@next @angular/forms@next @angular/http@next @angular/platform-browser@next @angular/platform-browser-dynamic@next @angular/platform-server@next @angular/router@next @angular/animations@next --save

In Mac PC:

npm install @angular/{common,compiler,compiler-cli,core,forms,http,platform-browser,platform-browser-dynamic,platform-server,router,animations}@next --save

In last, actualice typescript version:

> npm install typescript@2.2.1 --save

And finally, start the project:

> ng serve