diff --git a/static/select_serialport.js b/static/select_serialport.js
new file mode 100644
index 000000000..798ab8b9c
--- /dev/null
+++ b/static/select_serialport.js
@@ -0,0 +1,11 @@
+document.getElementById('serPort').onload = function() {
+  var element = document.getElementById('serPort');
+  var event = new Event('change');
+  element.dispatchEvent(event);
+};
+
+function serialPortChanged(elem){
+  var style = elem.value == 0 ? '' : 'none';
+  document.getElementById('tr_taskdevicepin1').style.display = style;
+  document.getElementById('tr_taskdevicepin2').style.display = style;
+}