How to Resolve Resizing Issues of Rich Text Editor in Blazor Dialogs?
When using a Rich Text Editor in Markdown mode within a dialog, users may experience unexpected resizing or behavior. This article explains the underlying cause of this issue and provides a solution to ensure the editor functions correctly.
Issue Overview
In Markdown mode, the Rich Text Editor is rendered as a <textarea>. Its height is not automatically calculated; instead, it relies on the scroll height, which is only available after the element is appended to the Document Object Model (DOM).
When the editor is placed inside a dialog, it is typically rendered before the dialog opens. At this point, since the editor has not yet been appended to the DOM, its scroll height is zero. This results in the editor appearing to resize or behave unexpectedly once the dialog is displayed.
Recommended Solution
To resolve the resizing issue, it is recommended to initialize the Rich Text Editor only after the dialog has fully opened. This approach ensures that the editor can accurately calculate its height, preventing any visual flicker or jumpy behavior.
Implementation Example
Here is an example of how to conditionally render the Rich Text Editor based on a flag set in the DialogOpenedHandler:
<SfDialog ShowCloseIcon="true" AllowPrerender="true" IsModal="true" ZIndex="200000">
<DialogEvents OnOpen="@DialogOpenedHandler"></DialogEvents>
<DialogTemplates>
<Header>Details</Header>
<Content>
<div id="details-target" class="h-100">
@if (isDropDownOpen)
{
<SfRichTextEditor id="benefits" @ref="@BenefitsRteComponent" @bind-Value="@Benefit" EditorMode="EditorMode.Markdown">
<RichTextEditorEvents Created="@OnBenefitsRteCreated"></RichTextEditorEvents>
<RichTextEditorToolbarSettings></RichTextEditorToolbarSettings>
</SfRichTextEditor>
}
</div>
</Content>
</DialogTemplates>
</SfDialog>
@code {
public bool isDropDownOpen { get; set; } = false;
public SfRichTextEditor BenefitsRteComponent { get; set; }
public async Task DialogOpenedHandler()
{
isDropDownOpen = true;
}
}
In this example, the isDropDownOpen flag is set to true in the DialogOpenedHandler, which triggers the rendering of the Rich Text Editor only after the dialog has opened.
Conclusion
By following the above approach, the Rich Text Editor can be effectively initialized within a dialog, ensuring proper height calculation and preventing any unexpected resizing behavior.
