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How to Properly Render Line Breaks in HTML Templates?

Linda HamiltonOriginal: 2024-10-30 14:59:02879browse

Replacing Newlines with
in HTML Templates

In HTML templates, replacing newlines (n) with markup (
) can lead to unexpected behavior due to escaping. When the loaded string is passed to the template, newlines are escaped to
, resulting in their display as literal text instead of line breaks.

Solution:

To address this issue, you can preprocess the text prior to using it in the template. Here's how:

Sanitize the input: Use the template.HTMLEscape() function to sanitize the text and remove any potentially malicious fragments.
Substitute newlines: After sanitization, substitute the newlines (n) with markup (
).
Wrap in HTML: Encapsulate the preprocessed text as HTML using template.HTML. This ensures that the template engine knows the content is safe.
Execute the template: Pass the sanitized and preprocessed text to the template for rendering.

Example Code:

<code class="go">import (
    "html/template"
    "os"
    "strings"
)

const page = `<!DOCTYPE html>
<html>
  <head>
  </head>
  <body>
    <p>{{.}}</p>
  </body>
</html>`

const text = `first line
<script>dangerous</script>
last line`

func main() {
    t := template.Must(template.New("page").Parse(page))
    safe := template.HTMLEscapeString(text)
    safe = strings.Replace(safe, "\n", "<br>", -1)
    t.Execute(os.Stdout, template.HTML(safe)) // Encapsulate as HTML
}</code>

This code ensures that any malicious content in the input text is neutralized and allows for proper rendering of newlines using markup.

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html String for using function this display input issue

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