TrimStart() spaces in textbox dynamically, ASP.NET MVC

I'd appreciate any advice.

Let's say I have a simple @Html.EditorFor(m=>m.SomeTextField).

When user types some text into it and leaves the textBox (focusOut()) I need to shift the text to the left, so that it removes all spaces in the start.

I know I could handle focusOut event and remove spaces, but is there a better way?

Thanks a lot!