[Rails] jquery function to prevent input from blank field with keypress of

[fugee ohu]

var submit_messages;

$(document).on('turbolinks:load', function () {
    submit_messages()
})

submit_messages = function () {
    $('#message_content').on('keyDown', function (event) {
        if (event.keyCode === 13) {
            $('input').click()
            event.target.value = ''
            event.preventDefault()
            console.log('yes we hit enter!')
        }
        
    })
    
}

I got this from a youtube video titled Rails 6 - Real Time Chat App What 
doesn't make sense to me is why do we only clear the field if the enter key 
is pressed, why doesn't that work anyway (it doesn't clear the field) and 
why doesn't it log to console 'yes we hit enter!'

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