How to convert Markdown string to HTML using Blazor Rich Text Editor?

Markdown editor to HTML

Blazor Markdown Editor is an intuitive and light-weight component that provides option for md to HTML conversion. It allows the content to be in the markdown format. The typed markdown syntax content can be previewed using a third-party plugin. The Blazor Rich Text Editor Component can be used as a Blazor WYSIWYG Markdown Editor (md editor).

In this knowledge base, we are going to integrate the Markdig third-party library into our Blazor Rich Text Editor’s Markdown editor (MD editor) to preview the Markdown.

What is Markdig?

Markdig is one of the fastest third-party libraries for parsing and converting Markdown plain text to HTML string. For more information, please go through this Markdig GitHub link.

Create a Blazor server-side application

First, create a Blazor server-side application and configure the Syncfusion Blazor services.

Configure the Blazor Rich Text Editor’s Markdown editor

Enable the Syncfusion Blazor Rich Text Editor to function as a Markdown editor:

1. Set the EditorMode as EditorMode.Markdown.

   <SfRichTextEditor EditorMode="EditorMode.Markdown">
   </SfRichTextEditor>
   

2. Then, set the SaveInterval to 1 to convert and trigger the ValueChange event every second.

   <SfRichTextEditor SaveInterval="1" EditorMode="EditorMode.Markdown" Height="100%" @bind-Value="@mdValue">
         ……
         …….
   </SfRichTextEditor>
   

3. Configure the most-used toolbar items like Bold and Italic for the SfRichTextEditor Markdown editor.

   private List<ToolbarItemModel> tools = new List<ToolbarItemModel>()
   {
        new ToolbarItemModel() { Command = ToolbarCommand.Bold },
        new ToolbarItemModel() { Command = ToolbarCommand.Italic },
        new ToolbarItemModel() { Command = ToolbarCommand.StrikeThrough },
        new ToolbarItemModel() { Command = ToolbarCommand.SubScript },
   …..
    };
   

4. Then, render the Markdown editor.

   <SfRichTextEditor SaveInterval="1" EditorMode="EditorMode.Markdown" Height="100%" @bind-Value="@mdValue">
      <RichTextEditorEvents ValueChange="onValueChange"></RichTextEditorEvents>
      <RichTextEditorToolbarSettings Items="@tools" Type="ToolbarType.MultiRow"></RichTextEditorToolbarSettings>
   </SfRichTextEditor>
   

Render another Rich Text Editor in the right side to preview the Markdown editor without a toolbar.

<SfRichTextEditor Readonly="true" Height="100%" @bind-Value="@htmlValue">
   <RichTextEditorToolbarSettings Enable="false"></RichTextEditorToolbarSettings>
</SfRichTextEditor>

Add the Markdig library

To import the Markdig namespace, install the Markdig NuGet package in your application as shown.

Show live preview

Convert the Rich Text Editor’s Markdown plain text to HTML string using the Markdig library. Then, bind the resultant HTML string to the Rich Text Editor Markdown preview on the right side to preview the HTML content.

private MarkdownPipeline pipeline { get; set; }
 private string htmlValue { get; set; }
 protected override void OnInitialized()
 {
    pipeline = new MarkdownPipelineBuilder().UseAdvancedExtensions().Build();
    this.htmlValue = Markdig.Markdown.ToHtml(mdValue, pipeline);
    base.OnInitialized();
 }

Convert the Markdown plain text to HTML string in the ValueChange event of the left-side Rich Text Editor.

private void onValueChange(Syncfusion.Blazor.RichTextEditor.ChangeEventArgs args)
    {
        if (args.Value == null)
        {
            this.htmlValue = null;
        }
        else
        {
            this.htmlValue = Markdig.Markdown.ToHtml(args.Value, pipeline);
        }
    }