groob/index.html

## index.html
<!DOCTYPE html>
<html xmlns="http://www.w3.org/1999/xhtml">
    <head>
        <meta http-equiv="content-type" content="text/html; charset=utf-8">
        <title>awesome go project</title>
    </head>
    <body>
        <form class="form-upload" method="post" action="/upload">
        <fieldset>
            <input type="text" name="first_name" />
            <span class="error">{{.Error}}</span>
            <input type="submit" name="submit" value="Submit">
        </fieldset>
    </body>
</html>

## main.go
package main

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

type Server struct {
	tmpl *template.Template
}

type Form struct {
	Error string
}

func (s *Server) handleUpload(w http.ResponseWriter, r *http.Request) {
	e := Form{Error: "Error: some bad input"}

	if err := s.tmpl.ExecuteTemplate(w, "index.html", e); err != nil {
		respondErr(err, w)
		return
	}
}

func (s *Server) index(w http.ResponseWriter, r *http.Request) {
	if err := s.tmpl.ExecuteTemplate(w, "index.html", nil); err != nil {
		respondErr(err, w)
		return
	}
}

func respondErr(err error, w http.ResponseWriter) {
	log.Println(err)
	http.Error(w, err.Error(), http.StatusInternalServerError)
	return
}

func main() {
	tmpl, err := template.ParseFiles("templates/index.html")
	if err != nil {
		log.Fatal(err)
	}
	s := &Server{tmpl}
	mux := http.NewServeMux()
	mux.HandleFunc("/", s.index)
	mux.HandleFunc("/upload", s.handleUpload)
	log.Fatal(http.ListenAndServe(":8089", mux))
}
	<!DOCTYPE html>
	<html xmlns="http://www.w3.org/1999/xhtml">
	<head>
	<meta http-equiv="content-type" content="text/html; charset=utf-8">
	<title>awesome go project</title>
	</head>
	<body>
	<form class="form-upload" method="post" action="/upload">
	<fieldset>
	<input type="text" name="first_name" />
	<span class="error">{{.Error}}</span>
	<input type="submit" name="submit" value="Submit">
	</fieldset>
	</body>
	</html>
	package main

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

	type Server struct {
	tmpl *template.Template
	}

	type Form struct {
	Error string
	}

	func (s Server) handleUpload(w http.ResponseWriter, r http.Request) {
	e := Form{Error: "Error: some bad input"}

	if err := s.tmpl.ExecuteTemplate(w, "index.html", e); err != nil {
	respondErr(err, w)
	return
	}
	}

	func (s Server) index(w http.ResponseWriter, r http.Request) {
	if err := s.tmpl.ExecuteTemplate(w, "index.html", nil); err != nil {
	respondErr(err, w)
	return
	}
	}

	func respondErr(err error, w http.ResponseWriter) {
	log.Println(err)
	http.Error(w, err.Error(), http.StatusInternalServerError)
	return
	}

	func main() {
	tmpl, err := template.ParseFiles("templates/index.html")
	if err != nil {
	log.Fatal(err)
	}
	s := &Server{tmpl}
	mux := http.NewServeMux()
	mux.HandleFunc("/", s.index)
	mux.HandleFunc("/upload", s.handleUpload)
	log.Fatal(http.ListenAndServe(":8089", mux))
	}