javascript - innerHTML on keypress - cannot get content -

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I have a function where the key of the key should be pressed while grabbing the inside HTML of a textile.

The function key appears to work with the press, though the following line does not return anything: 

  var currentHTML = document.getElementById ("postcontent"). InnerHTML;

What's wrong with the line, because it remains empty, I can not work.

I made a JS Bellal. Write something in the box and press Enter, you should give some console messages. You will see that Current HTML remains empty while grabbing the content.

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