英文:
How to use dynamic HTML tags in golang template?
问题
我正在尝试使用动态标签（默认为h2）来渲染一个标题。
<{{ or .Settings.headlineTag "h2" }}>
{{ .Content.headline }}
</ {{ or .Settings.headlineTag "h2" }}>
不幸的是，输出结果被转义了：
&lt;h2>
Headline
&lt;/ h2>
我该如何使其按预期工作？
英文:
I am trying to render a headline with a dynamic tag (fallback should be h2).
<{{ or .Settings.headlineTag "h2" }}>
{{ .Content.headline }}
</ {{ or .Settings.headlineTag "h2" }}>
Unfortunately the output is escaped:
&lt;h2>
Headline
&lt;/ h2>
How can I make this work as expected?
答案1
得分: 1
https://pkg.go.dev/html/template#hdr-Typed_Strings:
> 默认情况下，该包假设所有的管道都产生纯文本字符串。它添加了必要的转义管道阶段，以正确且安全地嵌入该纯文本字符串到适当的上下文中。
>
> 当数据值不是纯文本时，您可以通过标记其类型来确保它不会过度转义。
>
> 来自content.go的HTML、JS、URL和其他类型可以携带安全内容，免于转义。
以下是一个创建函数以组合标签并返回template.HTML的示例：
package main
import (
"fmt"
"html/template"
"os"
)
func main() {
data := []struct {
Tag string
Content string
}{
{
Tag: "h1",
Content: "How to use dynamic <HTML> tags in golang template?",
},
{
Content: `.Settings.headlineTag "h2"`,
},
}
const tpl = `
{{ range . }}
{{ tag .Tag "h2" .Content }}
{{ end }}
`
t, err := template.New("webpage").
Funcs(template.FuncMap{
"tag": func(tag, fallback, content string) template.HTML {
name := tag
if name == "" {
name = fallback
}
v := fmt.Sprintf("<%s>%s</%s>", name, template.HTMLEscapeString(content), name)
return template.HTML(v)
},
}).
Parse(tpl)
if err != nil {
panic(err)
}
err = t.Execute(os.Stdout, data)
if err != nil {
panic(err)
}
}
输出：
<h1>How to use dynamic <HTML> tags in golang template?</h1>
<h2>.Settings.headlineTag &#34;h2&#34;</h2>
英文:
https://pkg.go.dev/html/template#hdr-Typed_Strings:
> By default, this package assumes that all pipelines produce a plain text string. It adds escaping pipeline stages necessary to correctly and safely embed that plain text string in the appropriate context.
>
> When a data value is not plain text, you can make sure it is not over-escaped by marking it with its type.
>
> Types HTML, JS, URL, and others from content.go can carry safe content that is exempted from escaping.
Here is an example that creates a function to compose the tag and return a template.HTML:
package main
import (
"fmt"
"html/template"
"os"
)
func main() {
data := []struct {
Tag string
Content string
}{
{
Tag: "h1",
Content: "How to use dynamic <HTML> tags in golang template?",
},
{
Content: `.Settings.headlineTag "h2"`,
},
}
const tpl = `
{{ range . }}
{{ tag .Tag "h2" .Content }}
{{ end }}
`
t, err := template.New("webpage").
Funcs(template.FuncMap{
"tag": func(tag, fallback, content string) template.HTML {
name := tag
if name == "" {
name = fallback
}
v := fmt.Sprintf("<%s>%s</%s>", name, template.HTMLEscapeString(content), name)
return template.HTML(v)
},
}).
Parse(tpl)
if err != nil {
panic(err)
}
err = t.Execute(os.Stdout, data)
if err != nil {
panic(err)
}
}
Output:
<h1>How to use dynamic &lt;HTML&gt; tags in golang template?</h1>
<h2>.Settings.headlineTag &#34;h2&#34;</h2>
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