Hello Greg,

As a first step, I suggest you drop unpkg and use a proper CDN, or the static resources we provide. You can find examples of both here: https://docs.telerik.com/blazor-ui/getting-started/what-you-need#client-assets. If this does not help, I recommend opening a separate support ticket where you can showcase the issue and see about solving it - it seems to me to deviate from the particular issue discussed here.

Regards,
Marin Bratanov
Progress Telerik

Hello James,

This behavior stems from the fact that the Floating label component has a fixed width. The textarea takes 100% of the available vertical space provided by the wrapper (in this case the Floating label component). To achieve the desired behavior you can use some CSS to set the width of the FloatingLabel to 100%:

<style>
    .full-width {
        width: 100%;
    }
</style>

<TelerikWindow Modal="true" Height="400px"
               Width="500px" @bind-Visible="@isModalVisible"
               CloseOnOverlayClick="true">
    <WindowTitle>
        Window Title
    </WindowTitle>
    <WindowContent>
        <TelerikFloatingLabel Class="full-width" Text="(Optional)Enter Comments">
            <TelerikTextArea @bind-Value="@TextAreaValue" AutoSize="true" />
        </TelerikFloatingLabel>
        <br />
    </WindowContent>
    <WindowActions>
        <WindowAction Name="Close" />
    </WindowActions>
</TelerikWindow>

<TelerikButton OnClick="@( _ => isModalVisible = true )">Open the window</TelerikButton>

@code{
    bool isModalVisible { get; set; } = true;
    public string TextAreaValue { get; set; }
}

Regards,
Svetoslav Dimitrov
Progress Telerik

Hello James,

The AutoSize parameter of the TextArea would adjust the vertical size of the component, but will not affect the horizontal space it takes. I have to report that this is the expected behavior of the component. 

Regards,
Svetoslav Dimitrov
Progress Telerik

Hello James and John,

Could you check this REPL snippet, it has the TextArea definition from James' last post and the component is hosted inside a Telerik Modal Window. When I try to type a long text the text are expand vertically to adjust to the length of the input. Do you observe a different behavior? I would appreciate if you could modify the REPL snippet so that the issue is reproducible. 

Regards,
Svetoslav Dimitrov
Progress Telerik

Hi John,

There are indeed breaking changes in the 3.0 release that affect TextArea, but there are no changes regarding the AutoSize parameter. I created a REPL example that uses TextArea with AutoSize and works as expected. Take a look and let me know if I missed something.

Check in the above article that the Label parameter is now removed and will be replaced by the Floating Label component in the 3.2 release. Meanwhile use this Knowledge Base article as a reference to add a label.

As this is an expected behavior I am marking this Bug Report as declined. 

Let me know if you need more information.

Regards,
Apostolos
Progress Telerik