Is it possible to configure a required field to ignore white space?

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The required attribute in HTML5 is very handy:

<input type="text" required>

But it still allows users to enter white space only. Is there an HTML-only solution to this?

Use the pattern attribute combined with the required attribute. And be sure to include a title attribute as well, since most browsers insert the title text into the validation pop-up bubble.

<input required pattern=".*\S+.*" title="This field is required">

The .*\S+.* pattern requires at least one non-whitespace character, but also allows whitespace characters (spaces, tabs, carriage returns, etc.) at the beginning or end. If you don't want the user to be able to put whitespace at the beginning/end, then use this instead:

<input required pattern="\S+" title="This field is required">

Configure a required field to ignore white space, Configure a required field to ignore white space. Use the If you don't want the user to be able to put whitespace at the beginning/end, then use this instead:. Whitespace is a term that refers to characters that are used for formatting purposes. In C++, this refers primarily to spaces, tabs, and newlines. The C++ compiler generally ignores whitespace, with a few minor exceptions (when processing text literals).

Try the pattern attribute. You'll need a regex which specifies 'at least one character'.

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You probably want this:

<input type="text" required pattern="\S(.*\S)?">

(At least one non-whitespace character and no whitespace at the beginning or end of the input)


Or if whitespace at the beginning and end are fine, then this:

<input type="text" required pattern=".*\S.*">

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CSS white-space property, CSS Syntax. white-space: normal|nowrap|pre|pre-line|pre-wrap|initial|inherit; a single whitespace. Text will wrap when necessary, and on line breaks, Play it ». It is designed for planets and space. It works with small and large ships. The usage is pretty simple and with all script modes similar:-Dock your ship to a connector-Start recording the path-Fly to the job area-Stop recording-Setup the job and start the process That's all.

Comments
  • If you don't want the user to be able to put whitespace at the beginning/end, then use this instead No, it disallowes all of the whitecharacters. Required parrern is "\S.*\S".
  • @KonstantinNikitin: ..and that in turn requires at least two characters. If a single non-whitespace character is also valid, you'll want "\S(.*\S)?".
  • You probably want \S to disallow all whitespace