英文:
How to create a route with optional url var using gorilla mux?
问题
我想在路由中添加一个可选的URL变量。我似乎找不到使用mux包的方法。这是我的当前路由：
func main() {r := mux.NewRouter()r.HandleFunc("/view/{id:[0-9]+}", MakeHandler(ViewHandler))http.Handle("/", r)http.ListenAndServe(":8080", nil)}
当URL为localhost:8080/view/1时，它可以正常工作。我希望即使没有id，它也能接受URL，这样如果我输入localhost:8080/view，它仍然可以工作。你有什么想法？
英文:
I want to have an optional URL variable in route. I can't seem to find a way using mux package. Here's my current route:
func main() {r := mux.NewRouter()r.HandleFunc("/view/{id:[0-9]+}", MakeHandler(ViewHandler))http.Handle("/", r)http.ListenAndServe(":8080", nil)}
It works when the url is localhost:8080/view/1. I want it to accept even if there's no id so that if I enter localhost:8080/view it'll still work. Thoughts?
答案1
得分: 9
请问您需要将这段代码翻译成中文吗？
英文:
Register the handler a second time with the path you want:
r.HandleFunc("/view", MakeHandler(ViewHandler))
Just make sure when you are getting your vars that you check for this case:
vars := mux.Vars(r)id, ok := vars["id"]if !ok {// directory listingreturn}// specific view
答案2
得分: 5
你可以为根路径/view定义一个新的HandleFunc：
r.HandleFunc("/view", MakeHandler(RootHandler))
然后，RootHandler函数可以根据你的需求处理该路径。
英文:
You could define a new HandleFunc for the root /view path:
r.HandleFunc("/view", MakeHandler(RootHandler))
And have the RootHandler function do whatever you require for that path.
答案3
得分: 0
你可以使用?字符来表示id:[0-9]+模式是可选的，并在ViewHandler函数中处理是否传递了id。
main:
func main() {r := mux.NewRouter()r.HandleFunc("/view/{id:[0-9]+?}", MakeHandler(ViewHandler))http.Handle("/", r)http.ListenAndServe(":8080", nil)}
ViewHandler:
func ViewHandler(w http.ResponseWriter, r *http.Request) {vars := mux.Vars(r)id := vars["id"]if id == "" {fmt.Println("没有提供id")} else {fmt.Println("提供了id")}}
英文:
You can use the ? character to indicate that the id:[0-9]+ pattern is optional, and handle whenever there is an id is passed or not in your ViewHandler function.
main:
func main() {r := mux.NewRouter()r.HandleFunc("/view/{id:[0-9]+?}", MakeHandler(ViewHandler))http.Handle("/", r)http.ListenAndServe(":8080", nil)}
ViewHandler:
func ViewHandler(w http.ResponseWriter, r *http.Request) {vars := mux.Vars(r)id := vars["id"]if id == "" {fmt.Println("there is no id")} else {fmt.Println("there is an id")}}
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