gistfile1.scala

trait Htmlizable {
    def safeStr(obj:Any):String = if (obj == null) "" else obj.toString

    def persistentFields: Array[Field] = 
      getClass.getDeclaredFields.filter( f=> 
      f.getAnnotation(classOf[Persistent])  != null &&
      f.getAnnotation(classOf[PrimaryKey])  == null
    )

    def toForm(action:String): scala.xml.Elem = 
      <form action={action}>
        <fieldset>
          <legend>Insert your data</legend>
           {for  (field <- persistentFields) 
              yield
              <p>
                <label for={field.getName}>{field.getName}</label>
                <br/>
                <input 
                  type="text" 
                  class="text" 
                  id={field.getName} 
                  name={field.getName} 
                  value={safeStr(getClass.getDeclaredMethod(field.getName).invoke(this))}/>
              </p>
           }
           <p>
             <input type="submit" value="Submit"/>
             <input type="reset" value="Reset"/>
           </p>
        </fieldset>
      </form>
    
    def toHtml(cssClass:String = null): scala.xml.Elem = {
      val actualCssClass= if (cssClass == null) getClass.getName else cssClass 
      <div class={actualCssClass}>
           {for  (field <- persistentFields) 
              yield
              <p>
                <span>{field.getName}</span>
                  {safeStr(getClass.getDeclaredMethod(field.getName).invoke(this))}
              </p>
           }
      </div>
    }