Dividing template files for layout and content at Golang #Go

Environmnet

go version go1.11.5 linux/amd64

Directory Structure

/go
 └ src/
   └ sample/
     └ main.go
     └ templates/
       └ layout.html
       └ top.html

Source code

main.go

package main

import(
        "html/template"
        "log"
        "net/http"
)

func handlerIndex(w http.ResponseWriter, req *http.Request) {

        t := template.Must(template.ParseFiles(
                "templates/layout.html",
                "templates/top.html",
        ))

        s := "world"
        e := t.ExecuteTemplate(w, "layout.html", s)
        if e != nil { log.Fatal(e) }
}

func main() {
        http.HandleFunc("/", handlerIndex)
        http.ListenAndServe(":8080", nil)
}

templates/layout.html

<!DOCTYPE html>
<html>
        <body>
                {{ template "top.html" . }}
        </body>
</html>

templates/top.html

Hello, {{ . }}.

Build & Run

cd $GOPATH/src/sample/ && go run main.go