嵌入由 R 函数生成的 HTML

Question

我想动态构建 html 并渲染该 html 在四开本中。 实际应用涉及插入一个iFrame， 但为了简单起见，我们只创建一个 <img> 标签。

这是我的 .qmd 代码：

```{r}
source("awash-functions.r")
```

How do you inject html text produced in an r function into a **quarto** document? 
In R markdown, I had the function `sprintf` a string. That doesn't seem to work here!

Here is `awash-functions.r`:

    imageLink <- function(iUrl, iText) {
      sprintf("<img src = '%s' width='24'>&emsp;%s", iUrl, iText)
    }

let's call the function and see what appears:

```{r echo=FALSE}
imageLink("https://www.united.com/8cd8323f017505df6908afc0b72b4925.svg", "united logo")
```

and now, here's what it's supposed to look like:

<img src = 'https://www.united.com/8cd8323f017505df6908afc0b72b4925.svg'>&emsp;united logo

它渲染了，并且该函数显然被调用了， 但它显示的是 html 代码，而不是图像：

我知道这很简单，但我找不到。非常感谢！

Answer 1

有两点需要注意：

• 首先，Quarto 默认情况下将任何代码块输出包装在 中

   tag. To get the output asis you need to use the chunk option results: asis.
  
  

• Secondly, sprintf (or even print) returns output enclosed within quotes. So after using results: asis, you would get the html tags but would also get the quotes. So you need to wrap the sprintf with cat to get intended results.

---
format: html
---

```{r}
#| echo: false
imageLink <- function(iUrl, iText) {
  cat(sprintf(" %s", iUrl, iText))
}
```

```{r}
#| echo: false
#| results: asis
imageLink("https://www.united.com/8cd8323f017505df6908afc0b72b4925.svg", "united logo")
```

and now, here's what it's supposed to look like:

 united logo

---