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Accepted
Angela Zhou
Asked: 2025-03-06 00:54:53 +0800 CST

多级子菜单，可返回上一级或主菜单

  • 772

我正在开发一个多级菜单，我想实现子菜单和子子菜单返回上一个菜单或直接返回主菜单的功能。请参见下文...

[Menu]
1 - Option 1
2 - Option 2
3 - Quit (exit command)

Please choose option:

#Under Option 1
1 - Sub-Option 1
2 - Sub-Option 2
3 - back to main menu

#Under Sub-Option 1
1 - Sub-sub Option 1
2 - Sub-sub Option 2 
3 - back to Sub-option menu
4 - back to main menu

我当前的代码将每个菜单保留在单独的函数中。我在下面包含了我的子选项菜单...

suite_menu() {
    show_suite_menu

    read -p "Pick Number> " choice

    case $choice in

        1)  echo "1 selected."
            fullsuite_menu ;;
        2)  echo "2 selected."
            fullsuite_menu ;;
        3)  echo "3 selected."
            fullsuite_menu ;;
        0)  break;;
        *) echo "Invalid choice, please try again";;
    esac
}

我该如何编写子子选项菜单，让选项 3 进入上方菜单，让选项 0 进入主菜单？提前致谢 <3

bash

2 个回答

  1. Best Answer

    最初的想法是维护菜单/功能的某种调用堆栈，使用返回代码（或更可能是变量设置）确定“父”菜单/功能在从子菜单/功能调用返回时如何运行。如果需要维护某种递归数据集（例如，在“向下”时附加数据，在“向上”时删除数据），我可能会考虑类似的东西，但 OP 的问题中没有任何内容表明这种级别的数据操作，所以...

    一种简单的方法是让每个菜单选项/操作指定要调用的“下一个”命令（例如break， ），并在顶层<function_name>使用简单循环执行“下一个”命令。while true

    使用一些详细的代码实现 OP 的示例菜单bash，其中未定义的操作/菜单作为简单echo调用实现：

    ##########

menu_main() {

printf "\n#### current function: ${FUNCNAME}\n"

local menu choice

menu="
1 - Option 1
2 - Option 2
3 - Quit (exit command)
"

unset next

while true
do
    echo "${menu}"
    read -p "Pick Number> " choice

    case $choice in
        1) next=menu_1 ;;
        2) echo "choice #${choice}, do something" ;;
        3) next=break   ;;
        *) echo "Invalid choice, please try again";;
    esac

    [[ -n "${next}" ]] && break
done
}

##########

menu_1() {

printf "\n#### current function: ${FUNCNAME}\n"

local menu choice

menu="
1 - Sub-Option 1
2 - Sub-Option 2
3 - back to main menu
"

unset next

while true
do
    echo "${menu}"
    read -p "Pick Number> " choice

    case $choice in
        1) next=menu_1_1  ;;
        2) echo "choice #${choice}, do something" ;;
        3) next=menu_main ;;
        *) echo "Invalid choice, please try again";;
    esac

    [[ -n "${next}" ]] && break
done
}

##########

menu_1_1() {

printf "\n#### current function: ${FUNCNAME}\n"

local menu choice

menu="
1 - Sub-Sub-Option 1
2 - Sub-Sub-Option 2
3 - back Sub-option menu
4 - back to main menu
"

unset next

while true
do
    echo "${menu}"
    read -p "Pick Number> " choice

    case $choice in
        1) echo "choice #${choice}, do something" ;;
        2) echo "choice #${choice}, do something" ;;
        3) next=menu_1 ;;
        4) next=menu_main ;;
        *) echo "Invalid choice, please try again";;
    esac

    [[ -n "${next}" ]] && break
done
}

    笔记：

    • 此代码仅演示了整体概念
    • 可以进行多种变化，包括使用select、使用单个“通用”菜单函数，该函数使用输入参数来访问特定菜单的项目/操作（存储在数组中）等
    • 与 OP 的示例代码展示嵌套函数调用不同，此方法不进行嵌套函数调用；OP 负责确保每个函数在返回时指示父while true循环执行“下一个”操作

    进行试驾：

    next=menu_main

while true
do
    echo "#### next: ${next}"
    ${next}
done

    执行所有菜单选项的输出：

    #### next: menu_main

#### current function: menu_main

1 - Option 1
2 - Option 2
3 - Quit (exit command)

Pick Number> 1
#### next: menu_1

#### current function: menu_1

1 - Sub-Option 1
2 - Sub-Option 2
3 - back to main menu

Pick Number> 1
#### next: menu_1_1

#### current function: menu_1_1

1 - Sub-Sub-Option 1
2 - Sub-Sub-Option 2
3 - back Sub-option menu
4 - back to main menu

Pick Number> 1
choice #1, do something

1 - Sub-Sub-Option 1
2 - Sub-Sub-Option 2
3 - back Sub-option menu
4 - back to main menu

Pick Number> 2
choice #2, do something

1 - Sub-Sub-Option 1
2 - Sub-Sub-Option 2
3 - back Sub-option menu
4 - back to main menu

Pick Number> 3
#### next: menu_1

#### current function: menu_1

1 - Sub-Option 1
2 - Sub-Option 2
3 - back to main menu

Pick Number> 1
#### next: menu_1_1

#### current function: menu_1_1

1 - Sub-Sub-Option 1
2 - Sub-Sub-Option 2
3 - back Sub-option menu
4 - back to main menu

Pick Number> 4
#### next: menu_main

#### current function: menu_main

1 - Option 1
2 - Option 2
3 - Quit (exit command)

Pick Number> 1
#### next: menu_1

#### current function: menu_1

1 - Sub-Option 1
2 - Sub-Option 2
3 - back to main menu

Pick Number> 2
choice #2, do something

1 - Sub-Option 1
2 - Sub-Option 2
3 - back to main menu

Pick Number> 3
#### next: menu_main

#### current function: menu_main

1 - Option 1
2 - Option 2
3 - Quit (exit command)

Pick Number> 2
choice #2, do something

1 - Option 1
2 - Option 2
3 - Quit (exit command)

Pick Number> 3
#### next: break

$                      # return back to the console's command prompt
    • 1

  2. 你选择了一个答案，但这是我的解决方案。

    #!/bin/bash

function fullsuite_menu() {
    echo "Doing full suite menu for $1."
    nextmenu=main
}

function main() {
    select main in "Option 1" "Option 2" "Quit (exit command)"; do
        case $main in
            "Option 1") echo "1 selected."
                        nextmenu=option_1
                        break;;
            "Option 2") echo "2 selected."
                        nextmenu=option_2
                        break;;
            "Quit (exit command)") echo "3 selected."
                                   nextmenu=exit
                                   break;;
            *) echo "Invalid choice, please try again";;
        esac
    done
}

function option() {
    echo "Under Option $1"
    select option in "Sub-Option 1" "Sub-Option 2" "back to main menu"; do
        case $option in
            "Sub-Option 1") echo "1 selected."
                            nextmenu=sub_option_$1_1
                            break;;
            "Sub-Option 2") echo "2 selected."
                            nextmenu=sub_option_$1_2
                            break;;
            "back to main menu") echo "3 selected."
                                 nextmenu=main
                                 break;;
            *) echo "Invalid choice, please try again";;
        esac
    done
}

function sub_option() {
    echo "Under Sub-Option $1 $2"
    select option in "Sub-sub Option 1" "Sub-sub Option 2" "back to Sub-option menu" "back to main menu"; do
        case $option in
            "Sub-sub Option 1") echo "1 selected."
                                fullsuite_menu $option_$1_$2
                                break;;
            "Sub-sub Option 2") echo "2 selected."
                                fullsuite_menu $option_$1_$2
                                break;;
            "back to Sub-option menu") echo "3 selected."
                                       nextmenu=option_$1
                                       break;;
            "back to main menu") echo "3 selected."
                                 nextmenu=main
                                 break;;
            *) echo "Invalid choice, please try again";;
        esac
    done
}

function option_1() {
    option 1
}

function option_2() {
    option 2
}

function sub_option_1_1() {
    sub_option 1 1
}

function sub_option_2_1() {
    sub_option 2 1
}

function sub_option_1_2() {
    sub_option 1 2
}

function sub_option_2_2() {
    sub_option 2 2
}

function suite_menu() {
    PS3="Pick Number> "
    nextmenu=main
    while true; do $nextmenu; done
}

suite_menu
    • 0

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