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html/templateでlayoutファイルとcontentsファイルを分けたい場合

Last updated at Posted at 2014-11-11

html/templateで、よくあるテンプレートエンジンのように、
コンテンツファイルとレイアウトファイルを分けたい(jadeでいうextendみたいなやつ)時があるけれど、
その場合はどうも ParseFiles関数を使えばそれっぽくなる。

main.go(一部)
func main() {
	http.HandleFunc("/", handler)
	err := http.ListenAndServe(":8080", nil)
	if err != nil {
		log.Fatal("ListenAndServe: ", err)
	}
}
 
func handler(w http.ResponseWriter, r *http.Request) {
	data := map[string]string{
		"Name": "Mike",
	}
 
	tmpl := template.Must(template.ParseFiles("layout.html", "content.html"))
	w.Header().Set("Content-Type", "text/html")
 
	err := tmpl.Execute(w, data) // Hello, Mike
	if err != nil {
		panic(err)
	}
}
layout.html
<!DOCTYPE html>
<html>
  <head>
    <meta http-equiv="Content-Type" content="text/html; charset=utf-8">
  </head>
  <body>
    {{ template "content" . }}
  </body>
</html>
content.html
{{ define "content" }}
<p>Hello, {{ .Name }}</p>
{{ end }}

特に、どこかのドキュメントにやり方が書いてあるわけじゃなかったので、
今の今まで気づきませんでした。

gist: https://gist.github.com/hiroosak/fe52f06895dc40f7030b

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