javascript - How to check if a text is all white space characters in client side? -

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How does a user input text have all white space characters (space, tab, enter etc) in the client side? / P>

Thank you in advance!

This question has been tagged with jQuery. In JQuery, you can run the following: 

  if ($ .trim ($ ('# myInput'). Val ()) == '') Warning ('input is empty') ;

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