tux21b/example.go

## example.go
package main

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

var tmpl = template.Must(template.New("").Parse(`
{{define "index"}}<!DOCTYPE HTML>
<html>
<head>
<title>Example</title>
</head>
<body>
<form method="POST">
<label for="name">Please enter your name:</label>
<input name="name" id="name" value="" />
<input type="submit" value="Submit" />
</form>
</body>
</html>{{end}}

{{define "greating"}}<!DOCTYPE HTML>
<html>
<head>
<title>Example</title>
</head>
<body>
<h1>Hello {{.}}!</h1>
<p><a href="/">go back</a></p>
</body>
</html>
{{end}}`))

func handleIndex(w http.ResponseWriter, r *http.Request) {
	name := r.FormValue("name")
	if name != "" {
		if err := tmpl.ExecuteTemplate(w, "greating", name); err != nil {
			log.Println("ExecuteTemplate:", err)
		}
		return
	}
	if err := tmpl.ExecuteTemplate(w, "index", nil); err != nil {
		log.Println("ExecuteTemplate:", err)
	}
}

func main() {
	http.HandleFunc("/", handleIndex)

	if err := http.ListenAndServe(":8000", nil); err != nil {
		log.Fatalln("ListenAndServe:", err)
	}
}
	package main

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

	var tmpl = template.Must(template.New("").Parse(`
	{{define "index"}}<!DOCTYPE HTML>
	<html>
	<head>
	<title>Example</title>
	</head>
	<body>
	<form method="POST">
	<label for="name">Please enter your name:</label>
	<input name="name" id="name" value="" />
	<input type="submit" value="Submit" />
	</form>
	</body>
	</html>{{end}}

	{{define "greating"}}<!DOCTYPE HTML>
	<html>
	<head>
	<title>Example</title>
	</head>
	<body>
	<h1>Hello {{.}}!</h1>
	<p><a href="/">go back</a></p>
	</body>
	</html>
	{{end}}`))

	func handleIndex(w http.ResponseWriter, r *http.Request) {
	name := r.FormValue("name")
	if name != "" {
	if err := tmpl.ExecuteTemplate(w, "greating", name); err != nil {
	log.Println("ExecuteTemplate:", err)
	}
	return
	}
	if err := tmpl.ExecuteTemplate(w, "index", nil); err != nil {
	log.Println("ExecuteTemplate:", err)
	}
	}

	func main() {
	http.HandleFunc("/", handleIndex)

	if err := http.ListenAndServe(":8000", nil); err != nil {
	log.Fatalln("ListenAndServe:", err)
	}
	}