在我的代碼中，我想根據(jù)用戶(hù)身份驗(yàn)證級(jí)別禁用一些輸入字段，我可以在 JavaScript 中做到這一點(diǎn)，但這是不推薦的解決方案，我想從服務(wù)器端做到這一點(diǎn)。以下是我的go代碼；package mainimport ( "context" "html/template" "net/http" "strings" "time")type User struct { Flags string Title string}type UsersPageData struct { PageTitle string Users []User}func requestTime(next http.Handler) http.Handler { return http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) { ctx := r.Context() ctx = context.WithValue(ctx, "requestTime", time.Now().Format(time.RFC3339)) r = r.WithContext(ctx) next.ServeHTTP(w, r) })}func helloHandler(name string) http.Handler { return http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) { var title string if requestTime := r.Context().Value("requestTime"); requestTime != nil { if str, ok := requestTime.(string); ok { title = "\ngenerated at: " + str } } master := strings.Join([]string{"admin", "user", "superuser", "read"}, " ") admin := strings.Join([]string{"admin"}, " ") user := strings.Join([]string{"user"}, " ") tmpl := template.Must(template.ParseFiles("index.html")) data := UsersPageData{ PageTitle: "Users list: " + title, Users: []User{ {Flags: master, Title: "Everything"}, {Flags: admin, Title: "Administrator"}, {Flags: user, Title: "Normal user"}, }, } tmpl.Execute(w, data) })}func main() { http.Handle("/john", requestTime(helloHandler("John"))) http.ListenAndServe(":8080", nil)}這是我的模板，包括 JS 代碼；<style>.admin { color: green;}.user { color: red; --btn-disable: 0;}[data-authorized="no"] { /* Attribute has this exact value */ cursor: not-allowed; pointer-events: none; /*Button disabled - CSS color class*/ color: #c0c0c0; background-color: rgb(229, 229, 229) !important;}
1 回答
ibeautiful
TA貢獻(xiàn)1993條經(jīng)驗(yàn) 獲得超6個(gè)贊
在完整代碼下方，借助模板自定義函數(shù)，我能夠做到這一點(diǎn)：
package main
import (
"html/template"
"net/http"
)
type User struct {
Flags []flag //string
Title string
}
type UsersPageData struct {
PageTitle string
Users []User
}
type flag int
const (
Admin flag = iota + 1 // iota = 0
Editer
Superuser
Viewer
Dummy
)
func subtract(arg1, arg2 int) int {
return arg1 - arg2
}
func helloHandler(name string) http.Handler {
return http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
// Map the `subtract` custom function in the template
funcMap := map[string]interface{}{"subtract": subtract}
master := []flag{Admin, Editer, Superuser, Viewer}
admin := []flag{Admin, Superuser, Viewer}
user := []flag{Viewer, Dummy}
tmpl := template.New("").Funcs(template.FuncMap(funcMap))
template.Must(tmpl.ParseFiles("index.html"))
data := UsersPageData{
PageTitle: "Users list: ",
Users: []User{
{Flags: master, Title: "Everything"},
{Flags: admin, Title: "Administrator"},
{Flags: user, Title: "Normal user"},
},
}
tmpl.ExecuteTemplate(w, "index.html", data)
})
}
func main() {
fs := http.StripPrefix("/www/", http.FileServer(http.Dir("./www")))
http.Handle("/www/", fs)
http.Handle("/", helloHandler("John"))
http.ListenAndServe(":8080", nil)
}
是index.html：
<html>
{{/* This is a comment
{{$flags := []flag{Admin, Editer, Superuser, Viewer};}}
Admin Flag = iota + 1 // iota = 0
Editer
Superuser
Viewer
}}
*/}}
<ul>
{{range .Users}}
<span>{{.Title}}</span>
{{ $done := false}} {{$length := len .Flags}}
{{range $i, $v := .Flags}}
{{ if $done }}
{{ else }}
{{if or (eq $v 1) (eq $v 3)}}
<input type="text" name="subject" placeholder= {{$v}} required>
{{ $done = true }}
{{else}}
{{ if eq $i (subtract $length 1)}}
<input type="text" name="subject" placeholder= {{$v}} disabled>
{{ end }}
{{end}}
{{end}}
{{end}}
{{end}}
</ul>
</html>
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