Golang实现包含菜单、增删功能的Web应用示例

Golang实现包含菜单、增删功能的Web应用示例 下午好，

希望论坛里有人能理解并书写西班牙语。

我想告诉大家，我刚开始学习Go语言编程，因此，如果可能的话，我请求有人能帮助我更好地理解Go编程环境，并能提供一个使用菜单、增删操作的Web应用程序示例。

非常感谢。

此致， Esteban Méndez 墨西哥

1 回复

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// Ejemplo de aplicación web en Go con menú y operaciones CRUD package main

import ( “fmt” “html/template” “net/http” “strconv” )

// Estructura para los elementos del menú type MenuItem struct { ID int Name string Price float64 }

var menuItems = []MenuItem{ {1, “Tacos al Pastor”, 25.50}, {2, “Enchiladas”, 32.00}, {3, “Chiles Rellenos”, 28.75}, }

var templates = template.Must(template.ParseGlob(“templates/*.html”))

func main() { http.HandleFunc("/", indexHandler) http.HandleFunc("/add", addHandler) http.HandleFunc("/delete", deleteHandler) http.HandleFunc("/edit", editHandler)

fmt.Println("Servidor iniciado en http://localhost:8080")
http.ListenAndServe(":8080", nil)

}

func indexHandler(w http.ResponseWriter, r *http.Request) { data := struct { Title string Items []MenuItem }{ Title: “Menú del Restaurante”, Items: menuItems, } templates.ExecuteTemplate(w, “index.html”, data) }

func addHandler(w http.ResponseWriter, r *http.Request) { if r.Method == “POST” { name := r.FormValue(“name”) price, _ := strconv.ParseFloat(r.FormValue(“price”), 64)

    newID := len(menuItems) + 1
    newItem := MenuItem{
        ID:    newID,
        Name:  name,
        Price: price,
    }
    menuItems = append(menuItems, newItem)
    
    http.Redirect(w, r, "/", http.StatusSeeOther)
    return
}
templates.ExecuteTemplate(w, "add.html", nil)

}

func deleteHandler(w http.ResponseWriter, r *http.Request) { if r.Method == “POST” { id, _ := strconv.Atoi(r.FormValue(“id”))

    for i, item := range menuItems {
        if item.ID == id {
            menuItems = append(menuItems[:i], menuItems[i+1:]...)
            break
        }
    }
    http.Redirect(w, r, "/", http.StatusSeeOther)
    return
}

id, _ := strconv.Atoi(r.URL.Query().Get("id"))
templates.ExecuteTemplate(w, "delete.html", id)

}

func editHandler(w http.ResponseWriter, r *http.Request) { if r.Method == “POST” { id, _ := strconv.Atoi(r.FormValue(“id”)) name := r.FormValue(“name”) price, _ := strconv.ParseFloat(r.FormValue(“price”), 64)

    for i, item := range menuItems {
        if item.ID == id {
            menuItems[i].Name = name
            menuItems[i].Price = price
            break
        }
    }
    http.Redirect(w, r, "/", http.StatusSeeOther)
    return
}

id, _ := strconv.Atoi(r.URL.Query().Get("id"))
var itemToEdit MenuItem
for _, item := range menuItems {
    if item.ID == id {
        itemToEdit = item
        break
    }
}
templates.ExecuteTemplate(w, "edit.html", itemToEdit)

}

// templates/index.html /*

<!DOCTYPE html> <html> <head> <title>{{.Title}}</title> </head> <body>

{{.Title}}

    {{range .Items}}
  • {{.ID}}. {{.Name}} - ${{.Price}} Editar Eliminar
    • {{end}}
Agregar nuevo item </body> </html> */

// templates/add.html /*

<!DOCTYPE html> <html> <body>

Agregar nuevo item

<form method="POST"> Nombre: <input type="text" name="name" required>
Precio: <input type="number" step="0.01" name="price" required>
<button type="submit">Guardar</button> </form> Volver al menú </body> </html> */

// templates/delete.html /*

<!DOCTYPE html> <html> <body>

Confirmar eliminación

<form method="POST"> <input type="hidden" name="id" value="{{.}}">

¿Está seguro de eliminar este item?

<button type="submit">Eliminar</button> </form> Cancelar </body> </html> */

// templates/edit.html /*

<!DOCTYPE html> <html> <body>

Editar item

<form method="POST"> <input type="hidden" name="id" value="{{.ID}}"> Nombre: <input type="text" name="name" value="{{.Name}}" required>
Precio: <input type="number" step="0.01" name="price" value="{{.Price}}" required>
<button type="submit">Actualizar</button> </form> Cancelar </body> </html> */
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