r - 如何使用 R Markdown 和 Knitr 对齐 HTML 输出中的表格

Question

我正在 RStudio 中试验 Knitr/KableExtra，但无法让我的表格使用 Web 浏览器的整个宽度或控制表格在屏幕上的对齐方式。

下面是代码示例，根据 kable_styling 文档，我尝试强制表格与屏幕左侧对齐，但在 html 输出中，表格始终居中。它看到左侧有一个我无法使用的无形边距。当我有一个包含更多字段的表格时，问题就出现了......左边的大边距仍然存在，迫使表格延伸到屏幕右侧并生成水平滚动条 - 非常烦人和丑陋。

有什么方法可以使用左边距的空间或强制表格真正向左对齐吗？

这是问题的一个例子:

---
title: "Untitled"
author: "ME"
date: "2/4/2020"
output: html_document
---

```{r setup, include=FALSE}
library(kableExtra)

knitr::opts_chunk$set(echo = TRUE)
```

## R Markdown

This is an R Markdown document. Markdown is a simple formatting syntax for authoring HTML, PDF, and MS Word documents. For more details on using R Markdown see <http://rmarkdown.rstudio.com>.

When you click the **Knit** button a document will be generated that includes both content as well as the output of any embedded R code chunks within the document. You can embed an R code chunk like this:

```{r cars}
x_html <- knitr::kable(head(mtcars), "html")
kable_styling(x_html, "striped", position = "left", font_size = 7)
```

Answer 1

您需要调整默认的 CSS 主题。例如，要使内容显示在可用宽度的 100% 上:

```{css}
.main-container {
    max-width: 100%;
}
```

还有其他解决方案，但这个可能是最简单的:

---
title: "Untitled"
author: "ME"
date: "2/4/2020"
output: html_document
---

```{r setup, include=FALSE}
library(kableExtra)

knitr::opts_chunk$set(echo = TRUE)
```

```{css}
.main-container {
    max-width: 100%;
}
```

## R Markdown

This is an R Markdown document. Markdown is a simple formatting syntax for authoring HTML, PDF, and MS Word documents. For more details on using R Markdown see <http://rmarkdown.rstudio.com>.

When you click the **Knit** button a document will be generated that includes both content as well as the output of any embedded R code chunks within the document. You can embed an R code chunk like this:

```{r cars}
x_html <- knitr::kable(head(mtcars), "html")
kable_styling(x_html, "striped", position = "left", font_size = 7)
```