add new feature to 'renderform' function, user could add HTML id and class now

@@ -368,23 +368,23 @@ func RenderForm(obj interface{}) template.HTML {
 
 		fieldT := objT.Field(i)
 
-		label, name, fType, ignored := parseFormTag(fieldT)
+		label, name, fType, id, class, ignored := parseFormTag(fieldT)
 		if ignored {
 			continue
 		}
 
-		raw = append(raw, renderFormField(label, name, fType, fieldV.Interface()))
+		raw = append(raw, renderFormField(label, name, fType, fieldV.Interface(), id, class))
 	}
 	return template.HTML(strings.Join(raw, "</br>"))
 }
 
 // renderFormField returns a string containing HTML of a single form field.
-func renderFormField(label, name, fType string, value interface{}) string {
+func renderFormField(label, name, fType string, value interface{}, id string, class string) string {
 	if isValidForInput(fType) {
-		return fmt.Sprintf(`%v<input name="%v" type="%v" value="%v">`, label, name, fType, value)
+		return fmt.Sprintf(`%v<input id="%v" class="%v" name="%v" type="%v" value="%v">`, label, id, class, name, fType, value)
 	}
 
-	return fmt.Sprintf(`%v<%v name="%v">%v</%v>`, label, fType, name, value, fType)
+	return fmt.Sprintf(`%v<%v id="%v" class="%v" name="%v">%v</%v>`, label, fType, id, class, name, value, fType)
 }
 
 // isValidForInput checks if fType is a valid value for the `type` property of an HTML input element.
@@ -400,12 +400,14 @@ func isValidForInput(fType string) bool {
 
 // parseFormTag takes the stuct-tag of a StructField and parses the `form` value.
 // returned are the form label, name-property, type and wether the field should be ignored.
-func parseFormTag(fieldT reflect.StructField) (label, name, fType string, ignored bool) {
+func parseFormTag(fieldT reflect.StructField) (label, name, fType string, id string, class string, ignored bool) {
 	tags := strings.Split(fieldT.Tag.Get("form"), ",")
 	label = fieldT.Name + ": "
 	name = fieldT.Name
 	fType = "text"
 	ignored = false
+	id = fieldT.Tag.Get("id")
+	class = fieldT.Tag.Get("class")
 
 	switch len(tags) {
 	case 1: