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How to Properly Render Line Breaks in HTML Templates?
- Linda HamiltonOriginal
- 2024-10-30 14:59:02983browse
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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