Disable input onsubmit

Used to make the post send empty field.
Tweak: disable on setTimeout

templates/chat.html

                                         <div class="scrollable">
                                             {{ content|safe }}
                                         </div>
-                                        <form method="POST" action="">
-                                        <!-- onsubmit='document.getElementById("prompt").setAttribute("disabled", "")' -->
+                                        <form method="POST" action=""
+                                            onsubmit='setTimeout(() => { document.getElementById("prompt").setAttribute("disabled", ""); }, 100)'>
                                             <input class="prompt" id="prompt" name="prompt" placeholder="Talk to me" />
                                         </form>
                                     </section>
 				    {% for moment in history %}
 				    <section data-background-size="cover" data-background-video="{{moment.bg_video}}" data-background-opacity="0.75" data-background-video-loop="True" data-background-video-mute="True">
 					    <h3 class="title slide_title">{{moment.title}}</h3>
-					    <input class="prompt" value="{{moment.prompt}}" disabled />
+                                            {% if moment.prompt %}
+					        <input class="prompt" value="{{moment.prompt}}" disabled />
+                                            {% endif %}
                                             <div class="scrollable">
 						    {{ moment.content|safe }}
                                             </div>