preventing users from double click on submit

app/templates/views/notifications/preview.html

@@ -77,13 +77,16 @@
         help='3' if help else 0
       )}}" class='page-footer'>
       <input type="hidden" name="csrf_token" value="{{ csrf_token() }}" />
-      <!-- <p>Placeholder: This message will be delivered to <b>400 phone numbers</b> and will use a total of <b>800 message parts</b>, leaving Washington DSHS with <b>249,200 message parts remaining</b>.</p> -->
       <h3>Does everything look good?</h3>
       {% if not error %}
         {% set button_text %}
           {{ "Schedule" if scheduled_for else 'Send'}}
         {% endset %}
-        {{ usaButton({ "text": button_text }) }}
+        {{ usaButton({
+          "text": button_text,
+          "type": submit,
+          "preventDoubleClick": True,
+         }) }}
       {% endif %}
     </form>
   </div>