// Copyright 2015 The Go Authors. All rights reserved.
// Use of this source code is governed by a BSD-style
// license that can be found in the LICENSE file.
package template_test
import (
"fmt"
"html/template"
"log"
"os"
"strings"
)
func Example() {
const tpl = `
{{.Title}}
{{range .Items}}{{ . }}
{{else}}no rows
{{end}}
`
check := func(err error) {
if err != nil {
log.Fatal(err)
}
}
t, err := template.New("webpage").Parse(tpl)
check(err)
data := struct {
Title string
Items []string
}{
Title: "My page",
Items: []string{
"My photos",
"My blog",
},
}
err = t.Execute(os.Stdout, data)
check(err)
noItems := struct {
Title string
Items []string
}{
Title: "My another page",
Items: []string{},
}
err = t.Execute(os.Stdout, noItems)
check(err)
// Output:
//
//
//
//
// My page
//
//
// My photos
My blog
//
//
//
//
//
//
// My another page
//
//
// no rows
//
//
}
func Example_autoescaping() {
check := func(err error) {
if err != nil {
log.Fatal(err)
}
}
t, err := template.New("foo").Parse(`{{define "T"}}Hello, {{.}}!{{end}}`)
check(err)
err = t.ExecuteTemplate(os.Stdout, "T", "")
check(err)
// Output:
// Hello, <script>alert('you have been pwned')</script>!
}
func Example_escape() {
const s = `"Fran & Freddie's Diner" `
v := []interface{}{`"Fran & Freddie's Diner"`, ' ', ``}
fmt.Println(template.HTMLEscapeString(s))
template.HTMLEscape(os.Stdout, []byte(s))
fmt.Fprintln(os.Stdout, "")
fmt.Println(template.HTMLEscaper(v...))
fmt.Println(template.JSEscapeString(s))
template.JSEscape(os.Stdout, []byte(s))
fmt.Fprintln(os.Stdout, "")
fmt.Println(template.JSEscaper(v...))
fmt.Println(template.URLQueryEscaper(v...))
// Output:
// "Fran & Freddie's Diner" <tasty@example.com>
// "Fran & Freddie's Diner" <tasty@example.com>
// "Fran & Freddie's Diner"32<tasty@example.com>
// \"Fran \u0026 Freddie\'s Diner\" \u003Ctasty@example.com\u003E
// \"Fran \u0026 Freddie\'s Diner\" \u003Ctasty@example.com\u003E
// \"Fran \u0026 Freddie\'s Diner\"32\u003Ctasty@example.com\u003E
// %22Fran+%26+Freddie%27s+Diner%2232%3Ctasty%40example.com%3E
}
func ExampleTemplate_Delims() {
const text = "<<.Greeting>> {{.Name}}"
data := struct {
Greeting string
Name string
}{
Greeting: "Hello",
Name: "Joe",
}
t := template.Must(template.New("tpl").Delims("<<", ">>").Parse(text))
err := t.Execute(os.Stdout, data)
if err != nil {
log.Fatal(err)
}
// Output:
// Hello {{.Name}}
}
// The following example is duplicated in text/template; keep them in sync.
func ExampleTemplate_block() {
const (
master = `Names:{{block "list" .}}{{"\n"}}{{range .}}{{println "-" .}}{{end}}{{end}}`
overlay = `{{define "list"}} {{join . ", "}}{{end}} `
)
var (
funcs = template.FuncMap{"join": strings.Join}
guardians = []string{"Gamora", "Groot", "Nebula", "Rocket", "Star-Lord"}
)
masterTmpl, err := template.New("master").Funcs(funcs).Parse(master)
if err != nil {
log.Fatal(err)
}
overlayTmpl, err := template.Must(masterTmpl.Clone()).Parse(overlay)
if err != nil {
log.Fatal(err)
}
if err := masterTmpl.Execute(os.Stdout, guardians); err != nil {
log.Fatal(err)
}
if err := overlayTmpl.Execute(os.Stdout, guardians); err != nil {
log.Fatal(err)
}
// Output:
// Names:
// - Gamora
// - Groot
// - Nebula
// - Rocket
// - Star-Lord
// Names: Gamora, Groot, Nebula, Rocket, Star-Lord
}