How to catch enter keypress on textarea but not shift+enter? [duplicate]

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Test for the enter keycode (13) and if shift key was pressed.

...onkeyup = function(e) {
    if (e.keyCode == 13)
    {
//      if (e.shiftKey === true)
        if (e.shiftKey)  // thruthy
        {
            // new line
        }
        else
        {
            // run your function
        }
        return false;
    }
}

Edit: Accept all truthy values of e.shiftKey

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