How to add code folding to output chunks in rmarkdown html documents

I really appreciate the "code_folding" feature in RMarkdown. However, what I really need is to have the code show all the time and toggle the display on the output.

---
title: "test file"
author: "dayne"
date: "June 10, 2016"
output: 
  html_document:
    code_folding: hide
---

```{r setup, include=FALSE}
knitr::opts_chunk$set(echo = TRUE)
```

Here is a basic example.

```{r}
3 + 4
```

Is there a way to toggle the output rather than the code? The best (but not ideal) solution I have thought of is to add collapse=TRUE to the chunks, but then the code and the output still display at the same time.

Link to the compiled document: http://rpubs.com/daynefiler/188408