javascript - Retrieve text from textarea -

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i have <textarea></textarea> on html page , want retrieve info based on user types it. if user types "hello" in textarea. "how you" appear.

like (code doesn't work, example:

<script>         if ('msg'.value === "hello") {         document.write("how you");     } </script> <textarea  id="msg"></textarea> <input type="submit></input>

hope can me out!

edit: outputs msg val, on submit.

thanks!

'msg' string. need element:

if (document.getelementbyid('msg').value === "hello") {     document.write("how you"); }

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