Getting Started with RichTextEditor in Blazor

12 Sep 202220 minutes to read

This section briefly explains about how to include Blazor RichTextEditor component in your Blazor Server App and Blazor WebAssembly App using Visual Studio.

To get start quickly with Blazor Rich Text Editor components, you can check on this video:

You can also explore our Blazor Rich Text Editor example to knows how to render and configure the rich text editor tools.

Prerequisites

Create a new Blazor App in Visual Studio

You can create Blazor Server App or Blazor WebAssembly App using Visual Studio in one of the following ways,

Install Syncfusion Blazor RichTextEditor NuGet in the App

Syncfusion Blazor components are available in nuget.org. To use Syncfusion Blazor components in the application, add reference to the corresponding NuGet. Refer to NuGet packages topic for available NuGet packages list with component details and Benefits of using individual NuGet packages.

To add Blazor RichTextEditor component in the app, open the NuGet package manager in Visual Studio (Tools → NuGet Package Manager → Manage NuGet Packages for Solution), search for Syncfusion.Blazor.RichTextEditor and then install it.

Register Syncfusion Blazor Service

Open ~/_Imports.razor file and import the Syncfusion.Blazor namespace.

@using Syncfusion.Blazor

Now, register the Syncfusion Blazor Service in the Blazor Server App or Blazor WebAssembly App. Here, Syncfusion Blazor Service is registered by setting IgnoreScriptIsolation property as true to load the scripts externally in the next steps.

From 2022 Vol1 (20.1) version - The default value of IgnoreScriptIsolation is changed as true, so, you don’t have to set IgnoreScriptIsolation property explicitly to refer scripts externally.

Blazor Server App

  • For .NET 6 app, open the ~/Program.cs file and register the Syncfusion Blazor Service.

  • For .NET 5 and .NET 3.X app, open the ~/Startup.cs file and register the Syncfusion Blazor Service.

using Microsoft.AspNetCore.Components;
using Microsoft.AspNetCore.Components.Web;
using Syncfusion.Blazor;

var builder = WebApplication.CreateBuilder(args);

// Add services to the container.
builder.Services.AddRazorPages();
builder.Services.AddServerSideBlazor();
builder.Services.AddSyncfusionBlazor(options => { options.IgnoreScriptIsolation = true; });

var app = builder.Build();
....
using Syncfusion.Blazor;

namespace BlazorApplication
{
    public class Startup
    {
        ...
        public void ConfigureServices(IServiceCollection services)
        {
            services.AddRazorPages();
            services.AddServerSideBlazor();
            services.AddSyncfusionBlazor(options => { options.IgnoreScriptIsolation = true; });
        }
        ...
    }
}

Blazor WebAssembly App

Open ~/Program.cs file and register the Syncfusion Blazor Service in the client web app.

using Microsoft.AspNetCore.Components.Web;
using Microsoft.AspNetCore.Components.WebAssembly.Hosting;
using Syncfusion.Blazor;

var builder = WebAssemblyHostBuilder.CreateDefault(args);
builder.RootComponents.Add<App>("#app");
builder.RootComponents.Add<HeadOutlet>("head::after");

builder.Services.AddScoped(sp => new HttpClient { BaseAddress = new Uri(builder.HostEnvironment.BaseAddress) });

builder.Services.AddSyncfusionBlazor(options => { options.IgnoreScriptIsolation = true; });
await builder.Build().RunAsync();
....
using Syncfusion.Blazor;

namespace WebApplication1
{
    public class Program
    {
        public static async Task Main(string[] args)
        {
            ....
            builder.Services.AddSyncfusionBlazor(options => { options.IgnoreScriptIsolation = true; });
            await builder.Build().RunAsync();
        }
    }
}

Add Style Sheet

Checkout the Blazor Themes topic to learn different ways (Static Web Assets, CDN and CRG) to refer themes in Blazor application, and to have the expected appearance for Syncfusion Blazor components. Here, the theme is referred using Static Web Assets. Refer to Enable static web assets usage topic to use static assets in your project.

To add theme to the app, open the NuGet package manager in Visual Studio (Tools → NuGet Package Manager → Manage NuGet Packages for Solution), search for Syncfusion.Blazor.Themes and then install it. Then, the theme style sheet from NuGet can be referred as follows,

If you are using Syncfusion.Blazor single NuGet, you don’t have to refer Syncfusion.Blazor.Themes NuGet. Since style sheets already inside the assets of Syncfusion.Blazor NuGet.

Blazor Server App

  • For .NET 6 app, add the Syncfusion bootstrap5 theme in the <head> of the ~/Pages/_Layout.cshtml file.

  • For .NET 5 and .NET 3.X app, add the Syncfusion bootstrap5 theme in the <head> of the ~/Pages/_Host.cshtml file.

<head>
    ...
    <link href="_content/Syncfusion.Blazor.Themes/bootstrap5.css" rel="stylesheet" />
    <!--Refer theme style sheet as below if you are using Syncfusion.Blazor Single NuGet-->
    <!--<link href="_content/Syncfusion.Blazor/styles/bootstrap5.css" rel="stylesheet" />-->
</head>
<head>
    ...
    <link href="_content/Syncfusion.Blazor.Themes/bootstrap5.css" rel="stylesheet" />
    <!--Refer theme style sheet as below if you are using Syncfusion.Blazor Single NuGet-->
    <!--<link href="_content/Syncfusion.Blazor/styles/bootstrap5.css" rel="stylesheet" />-->
</head>

Blazor WebAssembly App

For Blazor WebAssembly App, Refer the theme style sheet from NuGet in the <head> of wwwroot/index.html file in the client web app.

<head>
    ...
    <link href="_content/Syncfusion.Blazor.Themes/bootstrap5.css" rel="stylesheet" />
    <!--Refer theme style sheet as below if you are using Syncfusion.Blazor Single NuGet-->
    <!--<link href="_content/Syncfusion.Blazor/styles/bootstrap5.css" rel="stylesheet" />-->
</head>

Add Script Reference

Checkout Adding Script Reference topic to learn different ways to add script reference in Blazor Application. In this getting started walk-through, the required scripts are referred using Static Web Assets externally inside the <head> as follows. Refer to Enable static web assets usage topic to use static assets in your project.

Blazor Server App

  • For .NET 6 app, Refer script in the <head> of the ~/Pages/_Layout.cshtml file.

  • For .NET 5 and .NET 3.X app, Refer script in the <head> of the ~/Pages/_Host.cshtml file.

<head>
    ....
    <link href="_content/Syncfusion.Blazor.Themes/bootstrap5.css" rel="stylesheet" />
    <script src="_content/Syncfusion.Blazor.Core/scripts/syncfusion-blazor.min.js" type="text/javascript"></script>
    <!--Use below script reference if you are using Syncfusion.Blazor Single NuGet-->
    <!--<script  src="_content/Syncfusion.Blazor/scripts/syncfusion-blazor.min.js"  type="text/javascript"></script>-->
</head>
<head>
    ....
    <link href="_content/Syncfusion.Blazor.Themes/bootstrap5.css" rel="stylesheet" />
    <script src="_content/Syncfusion.Blazor.Core/scripts/syncfusion-blazor.min.js" type="text/javascript"></script>
    <!--Use below script reference if you are using Syncfusion.Blazor Single NuGet-->
    <!--<script  src="_content/Syncfusion.Blazor/scripts/syncfusion-blazor.min.js"  type="text/javascript"></script>-->
</head>

Blazor WebAssembly App

For Blazor WebAssembly App, Refer script in the <head> of the ~/index.html file.

<head>
    ....
    <link href="_content/Syncfusion.Blazor.Themes/bootstrap5.css" rel="stylesheet" />
    <script src="_content/Syncfusion.Blazor.Core/scripts/syncfusion-blazor.min.js" type="text/javascript"></script>
    <!--Use below script reference if you are using Syncfusion.Blazor Single NuGet-->
    <!--<script  src="_content/Syncfusion.Blazor/scripts/syncfusion-blazor.min.js"  type="text/javascript"></script>-->
</head>

Syncfusion recommends to reference scripts using Static Web Assets, CDN and CRG by disabling JavaScript isolation for better loading performance of the Blazor application.

Add RichTextEditor component

  • Open ~/_Imports.razor file or any other page under the ~/Pages folder where the component is to be added and import the Syncfusion.Blazor.RichTextEditor namespace.
@using Syncfusion.Blazor
@using Syncfusion.Blazor.RichTextEditor
  • Now, add the Syncfusion RichTextEditor component in razor file. Here, the RichTextEditor component is added in the ~/Pages/Index.razor file under the ~/Pages folder.
<SfRichTextEditor>
    <p>Rich Text Editor allows to insert images from online source as well as local computer where you want to insert the image in your content.</p>
    <p><b>Get started Quick Toolbar to click on the image</b></p>
    <p>It is possible to add custom style on the selected image inside the Rich Text Editor through quick toolbar.</p>
</SfRichTextEditor>
  • Press Ctrl+F5 (Windows) or +F5 (macOS) to run the application. Then, the RichTextEditor component will be rendered in the default web browser.

Blazor RichTextEditor Component

Configure the Toolbar

Configure the toolbar with the tools using RichTextEditorToolbarSettings.Items property as your application requires.

<SfRichTextEditor>
    <RichTextEditorToolbarSettings Items="@Tools" />
    <p>The Rich Text Editor component is WYSIWYG ('what you see is what you get') editor that provides the best user experience to create and update the content. Users can format their content using standard toolbar commands.</p>
    <p><b> Key features:</b></p>
    <ul>
        <li><p> Provides <b>IFRAME</b> and <b>DIV</b> modes </p></li>
        <li><p> Capable of handling markdown editing.</p></li>
        <li><p> Contains a modular library to load the necessary functionality on demand.</p></li>
        <li><p> Provides a fully customizable toolbar.</p></li>
        <li><p> Provides HTML view to edit the source directly for developers.</p></li>
        <li><p> Supports third - party library integration.</p></li>
        <li><p> Allows preview of modified content before saving it.</p></li>
    </ul>
</SfRichTextEditor>

@code {
    private List<ToolbarItemModel> Tools = new List<ToolbarItemModel>()
    {
        new ToolbarItemModel() { Command = ToolbarCommand.Bold },
        new ToolbarItemModel() { Command = ToolbarCommand.Italic },
        new ToolbarItemModel() { Command = ToolbarCommand.Underline },
        new ToolbarItemModel() { Command = ToolbarCommand.StrikeThrough },
        new ToolbarItemModel() { Command = ToolbarCommand.FontName },
        new ToolbarItemModel() { Command = ToolbarCommand.FontSize },
        new ToolbarItemModel() { Command = ToolbarCommand.Separator },
        new ToolbarItemModel() { Command = ToolbarCommand.FontColor },
        new ToolbarItemModel() { Command = ToolbarCommand.BackgroundColor },
        new ToolbarItemModel() { Command = ToolbarCommand.Separator },
        new ToolbarItemModel() { Command = ToolbarCommand.Formats },
        new ToolbarItemModel() { Command = ToolbarCommand.Alignments },
        new ToolbarItemModel() { Command = ToolbarCommand.Separator },
        new ToolbarItemModel() { Command = ToolbarCommand.LowerCase },
        new ToolbarItemModel() { Command = ToolbarCommand.UpperCase },
        new ToolbarItemModel() { Command = ToolbarCommand.SuperScript },
        new ToolbarItemModel() { Command = ToolbarCommand.SubScript },
        new ToolbarItemModel() { Command = ToolbarCommand.Separator },
        new ToolbarItemModel() { Command = ToolbarCommand.OrderedList },
        new ToolbarItemModel() { Command = ToolbarCommand.UnorderedList },
        new ToolbarItemModel() { Command = ToolbarCommand.Outdent },
        new ToolbarItemModel() { Command = ToolbarCommand.Indent },
        new ToolbarItemModel() { Command = ToolbarCommand.Separator },
        new ToolbarItemModel() { Command = ToolbarCommand.CreateLink },
        new ToolbarItemModel() { Command = ToolbarCommand.Image },
        new ToolbarItemModel() { Command = ToolbarCommand.CreateTable },
        new ToolbarItemModel() { Command = ToolbarCommand.Separator },
        new ToolbarItemModel() { Command = ToolbarCommand.ClearFormat },
        new ToolbarItemModel() { Command = ToolbarCommand.Print },
        new ToolbarItemModel() { Command = ToolbarCommand.SourceCode },
        new ToolbarItemModel() { Command = ToolbarCommand.FullScreen },
        new ToolbarItemModel() { Command = ToolbarCommand.Separator },
        new ToolbarItemModel() { Command = ToolbarCommand.Undo },
        new ToolbarItemModel() { Command = ToolbarCommand.Redo }
    };
}

Blazor RichTextEditor with Toolbar

View Sample in GitHub.

The Image inserts an image into Rich Text Editor’s content area, and the Link links an external resources such as website URLs to the selected text in the Rich Text Editor’s content respectively.

Specifies the items to be rendered in quick toolbar based on the target elements such as image, link and table element. The quick toolbar opens to customize the element by clicking the target element.

<SfRichTextEditor>
    <RichTextEditorToolbarSettings Items="@Tools" />
    <RichTextEditorQuickToolbarSettings Image="@Image" Link="@Link" />
    <p>Rich Text Editor allows to insert images from online source as well as local computer where you want to insert the image in your content.</p>
    <p><b>Get started Quick Toolbar to click on the image</b></p>
    <p>It is possible to add custom style on the selected image inside the Rich Text Editor through quick toolbar.</p>
    <img alt='Logo' style='width: 300px; height: 300px; transform: rotate(0deg);' src='https://blazor.syncfusion.com/demos/images/RichTextEditor/RTEImage-Feather.png' />
</SfRichTextEditor>

@code {
    private List<ToolbarItemModel> Tools = new List<ToolbarItemModel>()
    {
        new ToolbarItemModel() { Command = ToolbarCommand.Bold },
        new ToolbarItemModel() { Command = ToolbarCommand.Italic },
        new ToolbarItemModel() { Command = ToolbarCommand.Underline },
        new ToolbarItemModel() { Command = ToolbarCommand.Separator },
        new ToolbarItemModel() { Command = ToolbarCommand.Formats },
        new ToolbarItemModel() { Command = ToolbarCommand.Alignments },
        new ToolbarItemModel() { Command = ToolbarCommand.Separator },
        new ToolbarItemModel() { Command = ToolbarCommand.CreateLink },
        new ToolbarItemModel() { Command = ToolbarCommand.Image },
        new ToolbarItemModel() { Command = ToolbarCommand.Separator },
        new ToolbarItemModel() { Command = ToolbarCommand.SourceCode },
        new ToolbarItemModel() { Command = ToolbarCommand.Separator },
        new ToolbarItemModel() { Command = ToolbarCommand.Undo },
        new ToolbarItemModel() { Command = ToolbarCommand.Redo }
    };
    private List<ImageToolbarItemModel> Image = new List<ImageToolbarItemModel>()
    {
        new ImageToolbarItemModel() { Command = ImageToolbarCommand.Replace },
        new ImageToolbarItemModel() { Command = ImageToolbarCommand.Align },
        new ImageToolbarItemModel() { Command = ImageToolbarCommand.Caption },
        new ImageToolbarItemModel() { Command = ImageToolbarCommand.Remove },
        new ImageToolbarItemModel() { Command = ImageToolbarCommand.OpenImageLink },
        new ImageToolbarItemModel() { Command = ImageToolbarCommand.HorizontalSeparator },
        new ImageToolbarItemModel() { Command = ImageToolbarCommand.EditImageLink },
        new ImageToolbarItemModel() { Command = ImageToolbarCommand.RemoveImageLink },
        new ImageToolbarItemModel() { Command = ImageToolbarCommand.Display },
        new ImageToolbarItemModel() { Command = ImageToolbarCommand.AltText },
        new ImageToolbarItemModel() { Command = ImageToolbarCommand.Dimension }
    };
    private List<LinkToolbarItemModel> Link = new List<LinkToolbarItemModel>()
    {
        new LinkToolbarItemModel() { Command = LinkToolbarCommand.Open },
        new LinkToolbarItemModel() { Command = LinkToolbarCommand.Edit },
        new LinkToolbarItemModel() { Command = LinkToolbarCommand.UnLink }
    };
}

Blazor RichTextEditor with Image

Retrieve the formatted content

To retrieve the editor contents in HTML format, use the Value property of Rich Text Editor, and to fetch the editor content as plain text, use the GetText method of Rich Text Editor.

@using Syncfusion.Blazor.Buttons
@using Syncfusion.Blazor.RichTextEditor
@using Syncfusion.Blazor.Popups

<SfButton @onclick="@GetValue">Get Value</SfButton>
<SfButton @onclick="@GetText">Get Text</SfButton>

<br />
<SfDialog @ref="DialogObj" @bind-Visible="@Visibility" Content="@Content" Header="@Header" Target="#target" Height="200px"
          Width="400px" ShowCloseIcon="true">
    <DialogButtons>
        <DialogButton Content="Ok" IsPrimary="true" OnClick="@DlgButtonClick" />
    </DialogButtons>

</SfDialog>
<SfRichTextEditor @ref="RteObj" Value="@RteValue" />

@code {
    SfRichTextEditor RteObj;
    SfDialog DialogObj;
    private string Content;
    private bool Visibility = false;
    private string Header = "RichTextEditor's Value";
    private string RteValue = @"<p>Rich Text Editor allows to insert images from online source as well as local computer where you want to insert the image in your content.</p><p><b>Get started Quick Toolbar to click on the image</b></p><p>It is possible to add custom style on the selected image inside the Rich Text Editor through quick toolbar.</p><img alt='Logo' style='width: 300px; height: 300px; transform: rotate(0deg);' src='https://blazor.syncfusion.com/demos/images/RichTextEditor/RTEImage-Feather.png' />";
    private async Task GetValue()
    {
        this.Content = this.RteValue;
        await this.DialogObj.ShowAsync();
    }
    private async Task GetText()
    {
        this.Content = await this.RteObj.GetTextAsync();
        this.DialogObj.ShowAsync();
    }
    private async Task DlgButtonClick(object arg)
    {
        await this.DialogObj.HideAsync();
    }
}

Retrieve the number of characters

To retrieve the maximum number of characters in the Rich Text Editor’s content, use the GetCharCount method of the Rich Text Editor.

@using Syncfusion.Blazor.Buttons
@using Syncfusion.Blazor.RichTextEditor
@using Syncfusion.Blazor.Popups

<SfButton @onclick="@GetCharCount">Get Char Count</SfButton>

<br />
<SfDialog @ref="DialogObj" @bind-Visible="@Visibility" Content="@Content" Header="@Header" Target="#target" Height="200px"
          Width="400px" ShowCloseIcon="true">
    <DialogButtons>
        <DialogButton Content="Ok" IsPrimary="true" OnClick="@DlgButtonClick" />
    </DialogButtons>

</SfDialog>
<SfRichTextEditor @ref="RteObj" />

@code {
    SfRichTextEditor RteObj;
    SfDialog DialogObj;
    private string Content;
    private bool Visibility = false;
    private string Header = "RichTextEditor's Value";
    private string RteValue = @"<p>Rich Text Editor allows to insert images from online source as well as local computer where you want to insert the image in your content.</p><p><b>Get started Quick Toolbar to click on the image</b></p><p>It is possible to add custom style on the selected image inside the Rich Text Editor through quick toolbar.</p><img alt='Logo' style='width: 300px; height: 300px; transform: rotate(0deg);' src='https://blazor.syncfusion.com/demos/images/RichTextEditor/RTEImage-Feather.png' />";
    private async Task GetCharCount()
    {
        this.Content = await this.RteObj.GetCharCountAsync();
        await this.DialogObj.ShowAsync();
    }
    private async Task DlgButtonClick(object arg)
    {
        await this.DialogObj.HideAsync();
    }
}

See also