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並前往https://community.rstudio.com/t/how-to-check-if-a-textbox-has-some-valid-input-or-not/4971

How to check if a textbox has some valid input or not - shiny

... here the problem is if i give some spaces in the text input, i am able to submit. i would want to be able to check if textinput is empty ...

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