Get Started Documentation. Both client and server code is written in Callowing you to share code and libraries. Blazor is a feature of ASP. NETthe popular web development framework that extends the. NET developer platform with tools and libraries for building web apps. Blazor can run your client-side C code directly in the browser, using WebAssembly. Because it's real. NET running on WebAssembly, you can re-use code and libraries from server-side parts of your application.
Blazor code executing on the server has the flexibility to do anything you would normally do on the server, such as connecting directly to a database. Blazor apps can use existing. NET libraries, thanks to. NET Standard —a formal specification of.
For anyone new to Blazor, let me give you a quick overview. Blazor is a SPA-like framework developed by Microsoft. There is a client-side model, which runs via a WebAssembly-based.
NET runtime. NET Core runtime. You can find out more at Blazor. We want to be able to use our modal in whatever projects we see fit. The best way to achieve this is by using the Blazor Library project included in the CLI templates we installed above. This project type works in a similar way to a class library and allows us to share components and their assets images, CSS, etc. As this project type is currently only available using the dotnet CLI, we can run the following commands to create a new directory as well as the Blazor Library project.
Now we have a new Blazor library project we can open in Visual Studio. The only thing we want to keep is the styles. The first thing we are going to build is the ModalService. This is going to be the glue which will join our modal component with any other components that wish to use it. In the root of the project, add a new class called ModalService. The class exposes two methods, Show and Closeas well as a couple of events. The Show method is the interesting one, though.
After checking that the type passed in via the contentType argument is a Blazor component, it creates a new RenderFragment using said type. This is then passed into the OnShow event so it can be used by an event handler. In simple terms, a RenderFragment represents a piece of UI.
There are many interesting uses for RenderFragment especially when dealing with dynamic component generation, but that is a topic for another time. When creating a library, I always find it a good idea to provide an extension method which can handle registering services with the DI container. It makes sure that everything gets registered with the correct scope, plus consumers only have to add a single line to their apps.
Add a new class to the root of the project called ServiceCollectionExtension. Now that the service is in place, we can build the modal component.
I always like to separate the logic and the markup of my components. This is achieved by creating a base class with all the logic that the component will inherit, leaving the component with just markup. First add a new Razor View named Modal. The reason for this naming is so that Visual Studio will nest the base class under the Razor View.
One other thing. You will need to change the name of the base class. Again, you can call it what you want.GitHub is home to over 40 million developers working together to host and review code, manage projects, and build software together.
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A beautiful and customizable modal implementation for Blazor applications. You can install the package via the nuget package manager just search for Blazored. You can also install via powershell using the following command.
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For Blazor Server : You will need to add the following using statement and add a call to register the Blazored Modal services in your applications Startup. ConfigureServices method. For Blazor WebAssembly : You will need to add the following using statement and add a call to register the Blazored Modal services in your applications Program.
Main method. Please checkout the sample projects in this repo to see working examples of the features in the modal.
In order to show a modal, you need to inject the IModalService into the component or service you want to invoke the modal. You can then call the Show method passing in the title for the modal and the type of the component you want the modal to display. For example, if I have a component called Movies which I want to display in the modal and I want to call it from the Index component on a button click. If you want to pass values to the component you're displaying in the modal, then you can use the ModalParameters object.Blazor : Dialog Box popup Example
Take a look at the books table rendered by Blazor. In the beginning of loop we assign booking ID to local variable id. This is because of how click event of Delete button is called. It is action and everything in action body is evaluated when action is called. There is no better way right now for events with arguments.
I will use the sample application we have created in the previous post and extend it with the new functionalities we are going to talk about in this post. You will be familiar with the following topics after you read this post. For the purpose of this post, I create a model called ToDo.
Now we have added the entity and made required changes in dbcontext. Add the migration and create the table in the database through the package manager console. We have created the table in the database.
Create a service to access the table and perform CRUD operations. This service implements from an interface and the interface is configured in the startup for dependency injection.
Okay, the data access part is now completed. Make sure, you have added the following code at the end of ConfigureServices method in startup. This is to inject ToDoListService. I have copied the default FetchData. This code is very similar to FetchData. Now we have to call the service to fetch the data. The right place to make a service call is inside OnInitializedAsync. It is one of the Blazor Lifecycle methods. It is executed when the component is completely loaded.
You can use this method to load data by calling services because the control rendering will happen after this method. I have also added the code to display buttons for CRUD operations but not wired with any code as of now.Single-Page Applications are web applications that load a single HTML page and dynamically update that page as the user interacts with the app.
A modal popup will display the form to handle the use inputs and the form also have a dropdown list, which will bind to a database table. We will also provide a filter option to the user to filter the employee records based on employee name. The release 0. For more information, refer to my previous article Understanding Server-Side Blazor. The source code has been updated to. NET Core 3. Get the source code for this application from GitHub. Now, we will put some data into the Cities table.
We will be using this table to bind a dropdown list in our web application from which the user will select the desired city. Use the following insert statements. Now, our Database part is complete. Therefore, we will proceed to create the server side application using Visual Studio After clicking on OK, a new dialog will open asking you to select the project template.
You can observe two drop-down menus at the top left of the template window. NET Core 2. This will create our server-side Blazor solution. You can observe the folder structure in solution explorer, as shown in the below image. In future release of Blazor these two projects might be merged into one, but for now the separation is required due to the differences in the Blazor compilation model.
We are using Entity Framework core database first approach to create our models. Refer to image below. First, we will install the package for the database provider that we are targeting which is SQL Server in this case. Hence, run the following command. Since we are using Entity Framework Tools to create a model from the existing database, we will install the tools package as well.
After you have installed both the packages, we will scaffold our model from the database tables using the following command. Hence, we have successfully scaffolded our Models using EF core database first approach. We will be adding our class to handle database related operations inside this folder only.
Here, we have defined the methods to handle database operations. GetCityData will fetch the list of all the cities from Cities table. Give the name of class as EmployeeService. This will add the EmployeeService class to the Services folder. We will invoke the methods of EmployeeDataAccessLayer class from our service. The service will be injected to our components and the components will call the service methods to access the database. To make the service available to the components we need to configure it on the server side app.
Add the following line inside the ConfigureServices method of Startup class.When you buy this book you support this site! A Blazor application is composed of components. These components can be made fully re-usable by creating templated components. We start with the application created in the article: Blazor Forms and Validation.
In that application, on the Fetch data page, if we click the Add New Forecast button or the Edit button next to each row…. In this article we will create a Templated control that will allow us to replace the title of the popup dialog. We will do this not by simply passing a parameterbut by replacing the user interface elements. In addition, we will use Blazor templates to create a fully reusable generic template control that can be used with any data type. At this point, this is not a templated component.
It is essentially a copy of the popup code from the FetchData. Replace with two instances of the dialog component we just created, one that will be used for creating new records ShowNewRecordPopupand one for editing existing records ShowEditRecordPopup.
When we run the project, the Add New Forecastand the Edit button still work, but the title of the dialog is still the same. Note: The Delete button on the popup is programmatically set to show only when the record id is not a new record objWeatherForecast.
This allows you to fully customize the look and feel of the resulting component while still reusing much of the component structure and logic. To set the content of the RenderFragment parameter, open the FetchData. Now, when we run the project, each dialog will have customized header content.
In the preceding templated component example, the data type has to always be a type of WeatherForecast. However, we can create templated components that can work with any data type. The data type can be specified at the time the component is consumed. To consume the template, add the following code to the FetchData. When we run the project, the templated control allows us to customize the instance of the control while retaining the structure and logic of the HTML table.
When you have other controls on the page that are already using the default context parameter, you will find that the page will not even build and you will get an error like this:. The child content element 'RowTemplate' of component 'TableTemplate' uses the same parameter name 'context' as enclosing child content element 'Authorized' of component 'AuthorizeView'. Templated components. You must have Visual Studio Version Re: Creating Blazor Templated Components.