Why are HTML comments not displayed in Go templates and how can I fix it?-Golang-php.cn

Why are HTML comments not displayed in Go templates and how can I fix it?

DDD

Release： 2024-11-02 20:52:30

Original

610 people have browsed it

Why are HTML comments not displayed in Go templates and how can I fix it?

HTML Comments Not Displaying in Go Templates - Resolved

In Go applications, HTML comments are not rendered by default when using HTML templates. This can cause issues for certain scenarios, such as when using KnockoutJS's containerless control flow syntax. To address this problem, template.HTML can be utilized to retain HTML comments during template execution.

One method to employ template.HTML is by defining a custom template function called safe(). This function takes a string as an argument and returns it as template.HTML. By passing HTML comments through the safe() function, they can be marked as safe and will not be escaped or omitted during template rendering.

Here's an example:

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

func main() {
    t := template.Must(template.New("").Funcs(template.FuncMap{
        "safe": func(s string) template.HTML { return template.HTML(s) },
    }).Parse(src))
    t.Execute(os.Stdout, nil)
}

const src = `<html><body>
{{safe "<!-- This is a comment -->"}}
<div>Some <b>HTML</b> content</div>
</body></html>`</code>

Copy after login

Output:

<html><body>
<!-- This is a comment -->
<div>Some <b>HTML</b> content</div>
</body></html>

Copy after login

To utilize the safe() function, simply modify the HTML comments in the template to include the safe() function call, like so:

<code class="html">{{safe "<!-- Some HTML comment -->"}}</code>

Copy after login

Alternatively, use the pipe operator:

<code class="html">{{"<!-- Some HTML comment -->" | safe}}</code>

Copy after login

Note that HTML comments containing quotation marks ('"') need to be escaped, as below:

<code class="html">{{safe "<!-- Some \"HTML\" comment -->"}}</code>

Copy after login

Conditional HTML comments are not recommended as they can interfere with the context-sensitive escaping of the html/template package.

The above is the detailed content of Why are HTML comments not displayed in Go templates and how can I fix it?. For more information, please follow other related articles on the PHP Chinese website!