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This post has been published first on CodingTheSmartWay.com.Subscribe On YouTubeThis is the fourth part of the Angular Material series on CodingTheSmartWay.com. In this part well be focusing on Data Tables. Of course this part again assumes that youre familiar with the Angular Material library in general and that you know how to setup an Angular project and install the Angular Material library in that project. If youre new to Angular Material please first take a look at the first part of this series: Angular Material — Part 1 Introduction or visit the Angular Material Website at https:material.angular.io .If you want to learn about Angular Material Dialogs, Tooltips and SnackBars you should also check out the second part. For Angular Material Navigation elements (Menus, Sidenavs and Toolbars) check out the third part.Lets get started with part four. The following steps assume that you have already a new Angular 4 project set up and included the Angular Material library.Getting Started With Angular Material Data TablesPreparing The ProjectTo demonstrate the usage of data tables lets first add a new component to the project by using the Angular CLI:$ ng g component componentsusertableThis command is generating the following new files in your project structure:srcappcomponentsusertableusertable.component.csssrcappcomponentsusertableusertable.component.tssrcappcomponentsusertableusertable.component.htmlsrcappcomponentsusertableusertable.component.spec.tsLater on well user usertable.component.ts and usertable.component.html to implement the table output. But before doing so, lets first add service to our Angular application by using the following command:$ ng g service servicesuserThis command is adding the following new files to the project:srcappservicesuser.service.tssrcappservicesuser.service.spec.tsNext we need to import MatTableModule in app.module.ts. Add the following import statement:Furthermore add the import statement for the Angular HttpModule to the top of that file:Well use the HttpClient service (which is part of HttpClientModule) in UserService to request user data from a web service.Also add the modules to the imports array of @NgModule:UserService need to be included in app.module.ts:To make this service available to all our components it needs to be added to the providers array of the @NgModule decorator as you can see in the following:Implementing UserServiceBefore displaying data in an Angular Material Data Table we first need to retrieve that data. The data which wed like to display are user records from web service https:jsonplaceholder.typicode.comusers. Opening this URL in the browser returns the user records in JSON format as you can see in the following screenshot:To retrieve user data from that web service were implementing UserService first. Insert the following code into file user.service.ts:cThe is a typical Angular service. The Http service is injected into the service class and the getUser service method send a HTTP get request to the external service URL to retrieve the data. This methods returns an Observable of type User. User is a custom model class which is imported from srcappmodelsuser.model.ts. This file hasnt been created yet, so we need to do that now. Create this new file and then insert the following code to make the User data type available:Implementing UsertableComponentNext lets add the implementation for UsertableComponent to our application. Start with inserting the following template code into file usertable.component.html:Here were using the <mat-table><mat-table> element to include the table from Angular Material library. The dataSource property of that element is bound to dataSource. dataSource is an Object of type DataSource which will be implemented in the next step.For each table column the <ng-container> element is used and the matColumnDef directive is applied. A string with the name of that columns is assigned to this directive.Inside of the <ng-container> element each column consist ofA <mat-header-cell> element to which the *matHeaderCellDef directive is applied. This element contains the headline text which is displayed on top of the column.A <mat-cell> element which contains the content of the cell. The directive *matCellDef needs to be applied here and the string let user is assigned. By assigning that string were making sure that were able to access the current item from the data source via user.The complete the template implementation we need to include two more elements before the closing tag <mat-table>:The <mat-header-row> elements needs to be added and the *matHeaderRowDef directive needs to be added to this elements. This directive gets assigned a string which is containing the name of an array which contains the column names which should be displayed in the table. The displayedColumns array will be defined in the implementation of class UsertableComponent in the next step.Second the <mat-row> element is added and the *matRowDef directive is added.Having implemented the template code we can now continue with the corresponding component class implementation in file usertable.component.ts:First lets take a look at the implementation of class UsertableComponent. The class makes use of UserService. The service is injected into the class constructor.Two class properties are created:The dataSource members is initialized with a new instance of UserDataSource, a class which is created below. The UserService object is passed to the constructor of UserDataSource.The displayedColumns array which is containing the list of column names to be displayedThe class UserDataSource is created and extends DataSource<any>. This class is containingA constructor which takes the UserService object as a parameterMethod connect which is calling the getUser service method and returning an Observable of type User.Method disconnectWith that implementation in place the final result should look like you can see in the following screenshot:This post has been published first on CodingTheSmartWay.com.
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