Angular 1.x and Angular2 Blog

Monday, 24 October 2016

Create a Print Component in Angular2 which will print the user defined HTML element in DOM using Typescript (Print component)

In this post we are going to see how to create a Print component which will print the user defined element in DOM using the Typescript, for this first we have to create a Print component then we have to use that component in another component, later we will get a print button in the screen, then when we click the print button, we can find the print of that particular area in the printer.

Component:

import {    Component,ViewEncapsulation,
            Input,Output,OnChanges,ElementRef,
            EventEmitter } from '@angular/core';

@Component({
    selector:'print-page',
    encapsulation:ViewEncapsulation.None,
    template:`
     <button (click)="printDiv()" 
        class="btn btn-sm btn-primary">Print</button>
     <div id="printpage">
     </div>
    `,
    styles:[`
    @media screen {
        #printpage, #printpage * {
            display:none;
        }
    }
      @media print {
          body *{
              visibility:hidden;
              background: transparent;
            -webkit-print-color-adjust: exact !important; 
          }
          
          #printpage, #printpage *{
              visibility:visible;
               -webkit-print-color-adjust: exact !important; 
                box-shadow: inset 0 0 0 1000px gold;
          }

          #printpage{
            position:absolute;
            left:0;
            top:0;             
          }
      }
    `]

})
export class PrintComponent implements OnChanges{
    
    @Input('section') section:string;
    @Output() sectionChange = new EventEmitter<any>(); 

    constructor(private ele:ElementRef){
        if(this.section===undefined)
            this.section = '';
    }

    ngOnChanges(changes){
        if(changes.section && changes.section.currentValue!==undefined
        && changes.section.currentValue!==''){
           
        }
    }

    afterPrint(){
        console.log("after print");
        this.ele.nativeElement.children[0].innerHTML = '';
        this.sectionChange.emit(''); 
        this.section = '';
        
    }
 

    printDiv() {

        if(this.section && this.section != undefined && this.section!='') {
            var printContents = document.getElementById(this.section).innerHTML;
            var originalContents = document.body.innerHTML;      

        if(window){
            if (navigator.userAgent.toLowerCase().indexOf('chrome') > -1) {
                var popup = window.open('', '_blank', 
                'width=600,height=600,scrollbars=no,menubar=no,toolbar=no,'
                +'location=no,status=no,titlebar=no');
               
                popup.window.focus();
                popup.document.write('<!DOCTYPE html><html><head>  '
        +'<link rel="stylesheet" href="node_modules/bootstrap/dist/css/bootstrap.css" '
        +'media="screen,print">'
        +'<link rel="stylesheet" href="style.css" media="screen,print">'             
        +    '</head><body onload="window.print()"><div class="reward-body">' 
        + printContents + '</div></html>');
                popup.onbeforeunload = function (event) {           
                    popup.close();          
                    return '.\n';
                };
                popup.onabort = function (event) {             
                    popup.document.close();           
                    popup.close();         
                }
            } else {
                var popup = window.open('', '_blank', 'width=800,height=600');
                popup.document.open();
                popup.document.write('<html><head>'+
        +'<link rel="stylesheet" href="node_modules/bootstrap/dist/css/bootstrap.css"'
        +' media="all">'
        +'<link rel="stylesheet" href="style.css" media="all">'                
        +'</head><body onload="window.print()">' + printContents + '</html>');
                popup.document.close();
            }

             popup.document.close();
            }
            return true;
        }
    }

fetchStylesheets(){
     var output:string= '';
     for(var i=0;i<document.styleSheets.length;i++){
       output = output +' <link rel="stylesheet" type="text/css" href="'+    
                window.document.styleSheets[0].href +'" /> ';
     }
     return output;
 }

 fetchscriptSheets(){
     var output:string= '';
     for(var i=0;i<document.scripts.length;i++){
       output = output +' <script type="text/javascript" src="'+    
                window.document.scripts[0].src +'" /> ';
     }
     return output;
 }
   
}

In the above component you may notice one things i am created a two methods fetch the stylesheets , scripts, but i didnt use it, if you want to use in the output to load the scripts in printing then you can added that in the execution .

using the print component in another employee component:, for more detail reference about the employee component
please refer previous post. for service and model data

import { Component } from '@angular/core';
import { DataService } from './data.service';
import { IUser } from './user'

@Component({
    selector:'employee',
    template:`
    <div style="display:inline-block;width:400px;vertical-align:top">
        <h1>Employee </h1>
        <div>
            <input type="text" #emp />
            <button (click)="addEmployee(emp.value)" 
                class="btn btn-sm btn-primary">Add Emp</button>
            <button (click)="getEmployee()" 
                class="btn btn-sm btn-primary">Get Employees</button>
            <div style="margin-top:20px">
            <ul class="list-group" style="display:-webkit-box;overflow-x:scroll">
                <li class="panel list-group-item-primary" 
                *ngFor="let e of employees" style="list-style:none;">
                <div class="panel panel-default">
                <div class="panel-heading">
                    <h3 class="panel-title">{{e.username}}</h3>
                </div>
                <div class=""panel-body>
                    <div class="text-info" style="padding:5px;">{{e.name}} 
                    <span class="btn btn-sm btn-primary" 
                        (click)="getAlbum(e.id)">Get Album</span></div>
                    <div class="text-primary" style="padding:5px;"> 
                        {{e.address.city}},{{e.address.zipcode}}</div>
                    <div *ngIf="e.albums">
                    <ul class="list-group">
                    <li class="list-group-item" *ngFor="let alb of e.albums">
                        <div class="panel panel-default">
                            <div class="panel-heading">{{alb.title}}</div>
                            <div class=""panel-body>                       
                                <img [src]="alb.thumbnailUrl" />
                            </div>
                        </div>
                    </li>
                    </ul>
                    </div>
                </div>
                </div>
                </li>
            </ul>
            </div>
        </div>
    </div>
    `   
})
export class EmployeeComponent
{
    employees:IUser[];
  
    constructor(private dataservice:DataService){
        
    }

    addEmployee(employeeName)
    {
        this.dataservice.addEmployee(employeeName);
    }

    getEmployee(){
        this.dataservice.getEmployees()
        .subscribe(
            customer=>this.employees=customer,
            error=>console.log("error"+error)
            );
       
    }

    getAlbum(id){
        this.dataservice.getAlbums(id)
        .subscribe(
            albums=>this.employees.find(emp=>emp.id==id).albums = albums
            );
    }
}

When user click on the get album, it will fetch information about the particular user id's album , then click print button

Output:

After click the print button , the view of the print screen

From this post you can learn how to create a print component in the angular2 using the Typescript which will print the user defined element in the DOM

Send a HTTP request in angular2 Service using Typescript

In this post we are going to see how to send a HTTP request in Angular2 service and access the data from the response using the observable API

First we have to create a Model based on the response type, so that we are creating a interface for that, then we have to create a service which will make a HTTP call.

export interface IUser{
    id:number;
    name:string;
    username:string;
    email:string;
    address:IAddress;
    phone:string;
    website:string;
    company:ICompany;
    albums:IAlbum[];    
}

export interface ICompany{
    name:string;
    catchPharse:string;
    bs:string;
}

export interface IAddress{
    street:string;
    suite:string;
    city:string;
    zipcode:string;
    geo:IGeo;
}

export interface IGeo{
    lat:string;
    lon:string;
}

export interface IAlbum{
    albumId:number;
    id:number;
    title:string;
    url:string;
    thumbnailUrl:string;
}

Then we have to create a service which have the HTTP api has a dependency , The instance of the HTTP will be created in the constructor.

    import { Injectable } from '@angular/core';
    import { Http, Response } from '@angular/http';
    import { Observable } from 'rxjs/observable';
    import { IUser,IAlbum } from './user';
    import 'rxjs/add/operator/catch'
    import 'rxjs/add/operator/map';
    import 'rxjs/add/operator/do';

    @Injectable()
    export class DataService{

    private data:string[]=["Rajesh","suresh","ramu"];
    private url:string = "http://jsonplaceholder.typicode.com/users";

    constructor(private _http:Http){

    }

    getEmployees(): Observable<IUser[]>{
    return this._http.get(this.url)
    .map((response:Response)=><IUser[]>response.json())
    .do(data=>console.log("All : "+JSON.stringify(data)))
    .catch(this.HandleError);
    }

    getAlbums(id):Observable<any>{

    return this._http.get("http://jsonplaceholder.typicode.com/photos?albumId="+id)
    .map((response:Response)=><IAlbum[]>response.json())
    .do(data=>console.log("album "+JSON.stringify(data)))
    .catch(this.HandleError);       

    }


    private HandleError(error:Response){
        console.log(error);
        return Observable.throw(error.json().error || "server error");
    }

    addEmployee(name){
        this.data.push(name);
    }

    }

Next we have to invoke the call from inside the component , here we have to subscribe the request because return type of the method is a observable of particular type, in observable to get the response we have to subscribe , in subscribe we have three parameter, success, error, complete.

import { Component } from '@angular/core';
import { DataService } from './data.service';
import { IUser } from './user'

@Component({
    selector:'employee',
    template:`
    <div style="display:inline-block;width:400px;vertical-align:top">
        <h1>Employee </h1>
        <div>
            <input type="text" #emp />
            <button (click)="addEmployee(emp.value)" 
                class="btn btn-sm btn-primary">Add Emp</button>
            <button (click)="getEmployee()" 
                class="btn btn-sm btn-primary">Get Employees</button>
            <div style="margin-top:20px">
            <ul class="list-group" style="display:-webkit-box;overflow-x:scroll">
                <li class="panel list-group-item-primary" 
                *ngFor="let e of employees" style="list-style:none;">
                <div class="panel panel-default">
                <div class="panel-heading">
                    <h3 class="panel-title">{{e.username}}</h3>
                </div>
                <div class=""panel-body>
                    <div class="text-info" style="padding:5px;">{{e.name}} 
                    <span class="btn btn-sm btn-primary" 
                        (click)="getAlbum(e.id)">Get Album</span></div>
                    <div class="text-primary" style="padding:5px;"> 
                        {{e.address.city}},{{e.address.zipcode}}</div>
                    <div *ngIf="e.albums">
                    <ul class="list-group">
                    <li class="list-group-item" *ngFor="let alb of e.albums">
                        <div class="panel panel-default">
                            <div class="panel-heading">{{alb.title}}</div>
                            <div class=""panel-body>                       
                                <img [src]="alb.thumbnailUrl" />
                            </div>
                        </div>
                    </li>
                    </ul>
                    </div>
                </div>
                </div>
                </li>
            </ul>
            </div>
        </div>
    </div>
    `   
})
export class EmployeeComponent
{
    employees:IUser[];
  
    constructor(private dataservice:DataService){
        
    }

    addEmployee(employeeName)
    {
        this.dataservice.addEmployee(employeeName);
    }

    getEmployee(){
        this.dataservice.getEmployees()
        .subscribe(
            customer=>this.employees=customer,
            error=>console.log("error"+error)
            );
       
    }

    getAlbum(id){
        this.dataservice.getAlbums(id)
        .subscribe(
            albums=>this.employees.find(emp=>emp.id==id).albums = albums
            );
    }
}

Next thing we have to inject the module in to root module then start the app to run

    import { NgModule } from '@angular/core';
    import { BrowserModule } from '@angular/platform-browser';
    import { FormsModule } from '@angular/forms';
    import { HttpModule } from '@angular/http';
    
    import { BaseRequestOptions, Http, Headers } from '@angular/http';
    import { webformComponent } from './Component/web.component'
    import { PrintComponent } from './Component/print.component';
   
    import { EmployeeComponent,StudentComponent } from './employee.component'
    import { DataService } from './data.service';

    @NgModule({
        imports: [BrowserModule,
                  FormsModule,
                  HttpModule],
        exports: [],
        declarations: [webformComponent,
                       PrintComponent,        
                       EmployeeComponent],
        providers:[DataService],
        bootstrap:[webformComponent]
    })
    export class AppModule { 

    }

    import { platformBrowserDynamic } from '@angular/platform-browser-dynamic';
    import { AppModule } from './app.module';
    import { HelloModule } from './hello.module'

    const platform = platformBrowserDynamic();

    let moduleref = platform.bootstrapModule(AppModule);

Output:
********************

When you click on the Get Employees, it will fetch the information

When user click on the Get Album for each user this will fetch the album info

From this post you can learn how to invoke a Http call from the angular2 service