# Common Components

> Shared management components (login, etc.).

---

## Overview

Common components are shared UI elements used across the management module, primarily login components and other reusable pieces.

---

## Components

| Component | File | Purpose |
|-----------|------|---------|
| Login | `common/login.vue` | User login form |
| Login2 | `common/login2.vue` | Alternative login layout |

---

## Login Component (`login.vue`)

User authentication form with md5 password hashing.

### Props

| Prop | Type | Default | Description |
|------|------|---------|-------------|
| `logo` | String | null | Logo image URL |

### Events

| Event | Payload | Description |
|-------|---------|-------------|
| `login` | - | Emitted after successful login |

### Key Features

- Form validation with Element Plus `FormInstance`
- Enter key support for quick submit
- MD5 password hashing before API call
- Vuex state manipulation for layout (hides header/aside on login)
- Dynamic routing (back or home based on history)

### Implementation Pattern

```vue
<template>
    <el-form :model="param" ref="loginForm" :rules="rules">
        <NoobInput v-model="param.userId" :placeholder="t('pwd.userId')" />
        <NoobInput v-model="param.password" type="password" :placeholder="t('pwd.pwd')" />
        <NoobButton @click="login">{{ t('pwd.login') }}</NoobButton>
    </el-form>
</template>

<script setup>
const emit = defineEmits(["login"]);
const loginForm = ref<FormInstance>();

const login = () => {
    if (!loginForm.value) return;
    loginForm.value?.validate((valid, fields) => {
        if (valid) {
            loginConfirm(param.value);
        }
    });
};
</script>
```

### Vuex Layout Control

On mount, login page resets layout:

```typescript
onBeforeMount(() => {
    state.size.headHeight = '0px';
    state.size.asideWidth = '0px';
    commit("initSize");
});
```

### Login API Call

```typescript
import md5 from "js-md5";

const loginConfirm = user => {
    const param = JSON.parse(JSON.stringify(user));
    param.password = md5(param.password);
    Api.pub.login(param).then(rsp => {
        if (rsp) {
            if (window.history.length <= 1) {
                router.push('/');
            } else {
                router.back();
            }
            dispatch('login');
        }
    })
};
```

### Enter Key Support

```typescript
const enter_up = (e) => {
    if (e.keyCode == 13 || e.keyCode == 100) {
        login();
    }
};

onMounted(() => {
    document.addEventListener('keyup', enter_up);
});

onBeforeUnmount(() => {
    document.removeEventListener('keyup', enter_up);
});
```

---

## Validation Rules

Uses Element validators from `noob-mengyxu`:

```typescript
const { SimpleRequired } = Element;

const rules = {
    userId: [new SimpleRequired('pwd.userId')],
    password: [new SimpleRequired('pwd.pwd')]
}
```

---

## Login2 Component (`login2.vue`)

Alternative login layout - check source for specific variations.

---

## Common Exports (`common/index.ts`)

```typescript
import Login from './login.vue';
import Login2 from './login2.vue';

export default { Login, Login2 };
```

---

## Anti-Patterns

1. **Do not skip `clearValidate()`** - Always clear form validation on submit
2. **Do not use `window.history.length`** - This is a known anti-pattern in the codebase
3. **Do not forget `onBeforeUnmount`** - Clean up event listeners to prevent memory leaks
4. **Do not send plain passwords** - Always hash with md5 first