Create a context attribute and bind it to the width property of your textarea, then just read the attribute. Do not forget to initialize your attribute with default width.
this will only work if the attribute "width" of the text area is set. If the attribute "cols" is used, this attribute is initial (and still I would like to get the width in pixels).
I do not know the purpose of why you want to know the width of a textarea in pixels. Other thing that I can think of is to take a screenshot (Prnt Scrn button) and paste it in an image editor (like Photoshop). There you can measure the width of the textarea in pixels.
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