.
├── main.go
└── templates
├── confirmation.html
└── index.html
Created
April 8, 2017 02:57
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Form Validation and Processing in Go
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<h1>Confirmation</h1> |
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<style type="text/css" media="screen"> | |
.error { | |
color: red; | |
} | |
</style> | |
<h1>Contacts</h1> | |
<form action="/" method="POST" accept-charset="utf-8" novalidate> | |
<div> | |
{{ with .Errors.Email }} | |
<p class="error">{{ . }}</p> | |
{{ end }} | |
<label for="yourEmail:">yourEmail:</label> | |
<input type="email" name="email" value="{{ .Email }}"> | |
</div> | |
<div> | |
{{ with .Errors.Content}} | |
<p class="error">{{ . }}</p> | |
{{ end }} | |
<label for="yourMessage:">yourMessage:</label> | |
<textarea name="content" rows="8" cols="40" value="{{ .Content }}"></textarea> | |
</div> | |
<div> | |
<input type="submit" value="Send Message" > | |
</div> | |
</form> |
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package main | |
import ( | |
"log" | |
"html/template" | |
"regexp" | |
"strings" | |
"net/http" | |
"github.com/bmizerany/pat" | |
) | |
func main() { | |
mux := pat.New() | |
mux.Get("/", http.HandlerFunc(index)) | |
mux.Post("/", http.HandlerFunc(send)) | |
mux.Get("/confirm", http.HandlerFunc(confirm)) | |
log.Println("Listening....") | |
http.ListenAndServe(":9090", mux) | |
} | |
type Message struct { | |
Email string | |
Content string | |
Errors map[string]string | |
} | |
func (msg *Message) Validate() bool { | |
msg.Errors = make(map[string]string) | |
re := regexp.MustCompile(".+@.+\\..+") | |
matched := re.Match([]byte(msg.Email)) | |
if matched == false { | |
msg.Errors["Email"] = "Invalid email" | |
} | |
if strings.TrimSpace(msg.Content) == "" { | |
msg.Errors["Content"] = "Please input message" | |
} | |
return len(msg.Errors) == 0 | |
} | |
func index(w http.ResponseWriter, r *http.Request) { | |
render(w, "templates/index.html", nil) | |
} | |
func confirm(w http.ResponseWriter, r *http.Request) { | |
render(w, "templates/confirmation.html", nil) | |
} | |
func send(w http.ResponseWriter, r *http.Request) { | |
// Validate form | |
msg := &Message{ | |
Email: r.FormValue("email"), | |
Content: r.FormValue("content"), // TODO: design | |
} | |
if msg.Validate() == false { | |
render(w, "templates/index.html", msg) | |
return | |
} | |
http.Redirect(w, r, "/confirm", http.StatusSeeOther) | |
} | |
func render(w http.ResponseWriter, filename string, data interface{}) { | |
tmpl, err := template.ParseFiles(filename) | |
if err != nil { | |
http.Error(w, err.Error(), http.StatusInternalServerError) | |
} | |
if err := tmpl.Execute(w, data); err != nil { | |
http.Error(w, err.Error(), http.StatusInternalServerError) | |
} | |
} |
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