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Asked: 2026-05-11T15:11:31+00:00

I have a MultiLine asp:Textbox (a standard html textarea for those non-asp people) that

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I have a MultiLine asp:Textbox (a standard html textarea for those non-asp people) that I want to be auto-sized to fit all it’s content only through css. The reason for this is that I want it to be of a specified height in the web browser, with scrolling enabled.

I have implemented a print style sheet however and want all text located in the textarea to be displayed when printed with no overflow hidden.

I can manually specify the height of the textarea in the print.css file problem with this being that the fields are optional and a 350px blank box is not optimal and there is always the possibility of a larger amount of text than this…

I have tried using :

height: auto; height: 100%;

In IE and Firefox respectively yet these seem to be overridden by the presence of a specified number of rows in the html mark-up for the form which must be generated by .NET when you do not specify a height on the asp:Textbox tag, this seems to only accept numercial measurements such as px em etc…

Any ideas?

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1 Answer

  1. What you are asking for (a css solution) is not possible.

    The content of the textarea is not html elements, so it can not be used by css to calculate the size of the textarea.

    The only thing that could work would be Javascript, e.g. reading the scrollHeight property and use that to set the height of the element. Still the scrollHeight property is non-standard, so it might not work in all browsers.

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