<think>We are given a reference
about a R
ange
Date default value issue in JeecgBoot
. The reference mentions that there is a known issue in the current version
and a fix will come in a future version
. Until then, a temporary workaround is needed
.
However, the user's spec
ific question is: "如何在jeecgboot中为R
ange
Date设置默认值"
(How to set the default value for R
ange
Date in JeecgBoot
).
We note that the reference [^
1] states that there's a
problem in the current version
and a temporary fix is available until the official fix
.
Since the user is asking for the method to set the default value, we should provide the way to do it, even
if it's a temporary solution
.
Steps to set default values for R
ange
Date in JeecgBoot:
1. In the form component
(usually in the Vue file
), locate the R
angePicker
(the component for R
ange
Date).
2
. Use the `v-model` or `value` attribute to bind the default value
. However, note that the issue might be that the default value isn't being set correctly in the current version
.
3
. According to the reference, there might be a known issue
. Therefore, we c
an try a temporary solution until the fix is released
.
One common way to set the default value for a R
angePicker
(using
Ant Design Vue, which is used in JeecgBoot
) is:
```vue
<template>
<a-r
ange-picker v-model:value
="
dateR
ange" />
</template>
<script>
import { ref } from 'vue';
export default {
setup
() {
// Set default value to yesterday
and today, for example
const yesterday
= new
Date();
yesterday
.set
Date(yesterday
.get
Date() -
1);
const today
= new
Date();
const
dateR
ange
= ref
([yesterday, today]
);
return {
dateR
ange
};
}
};
</script>
```
Alternatively, in the options of the JEditableTable or form schema, you might set the default value in the column definition
.
Example in a JEditableTable column:
```js
{
title: '日期范围',
key: '
dateR
ange',
type: '
date',
r
ange: true, // indicates it's a r
ange picker
defaultValue: [moment
().subtract
(1, 'days'
), moment
()] //
if using moment
.js
}
```
But note: The reference [^
1] indicates that there is
an issue in the current version
. So
if the above doesn't work, we c
an try setting the value in the created/mounted hook
.
Temporary workaround
(if the default value doesn't show up
):
We c
an set the value of the r
ange picker in the `mounted` l
ifecycle hook by directly setting the form model or the component's value
.
Example:
```vue
<script>
import { ref, onMounted } from 'vue';
export default {
setup
() {
const
dateR
ange
= ref
([]
);
onMounted
(() => {
// Wait for the next tick to ensure the component is rendered
setTimeout
(() => {
const yesterday
= new
Date();
yesterday
.set
Date(yesterday
.get
Date() -
1);
const today
= new
Date();
dateR
ange
.value
= [yesterday, today];
},
0);
}
);
return {
dateR
ange
};
}
};
</script>
```
Alternatively,
if using Options API:
```vue
<script>
export default {
data
() {
return {
dateR
ange: []
};
},
mounted
() {
const yesterday
= new
Date();
yesterday
.set
Date(yesterday
.get
Date() -
1);
const today
= new
Date();
this
.dateR
ange
= [yesterday, today];
}
};
</script>
```
Note: The use of `setTimeout` might be necessary
if the component isn't ready at the exact moment of `mounted`
.
However, the exact approach may depend on the context
(like
if it's in a form or a table
). Also, note that the user might be using the older version of
Ant Design
(v2
) in their JeecgBoot
.
If the above does not work,
another temporary solution might be to set the default value in the model of the form when initializing the form
.
For example, in the form model:
```js
this
.form
.setFieldsValue
({
dateR
ange: [moment
().subtract
(1, 'days'
), moment
()]
}
);
```
But note: This might be done in the `created` or `mounted` hook, but after the form has been initialized
.
Since the issue is known
and a fix is coming, the user should also be advised to upgrade when the fix is available
.
Therefore, the
answer should include:
- The st
andard way of setting the default value
(which might be broken in the current version
)
- A temporary workaround
(using the mounted hook or setTimeout
)
- A note
about the upcoming fix
and the need to upgrade
.
Let's structure the
answer accordingly
.
</think>在 JeecgBoot 中为 R
ange
Date（日期范围选择器）设置默认值，可以通过以下步骤实现。根据引用内容[^
1]，当前版本可能存在已知问题，官方将在后续版本修复，以下是推荐的临时解决方案：
### 标准设置方法（Vue3 +
Ant Design Vue 语法）
```vue
<template>
<!-- 在表单组件中使用 -->
<a-form-item label
="日期范围" name
="
dateR
ange">
<a-r
ange-picker
v-model:value
="modelRef
.dateR
ange"
format
="YYYY-MM-DD"
/>
</a-form-item>
</template>
<script setup>
import { reactive } from 'vue';
import { Moment } from 'moment';
const modelRef
= reactive
({
// 设置默认值为最近7天
dateR
ange: [
moment
().subtract
(7, 'days'
),
moment
()
]
}
);
</script>
```
### 临时解决方案（针对当前版本的已知问题）
1. **初始化时动态赋值**
```vue
<script setup>
import { onMounted } from 'vue';
const setDefaultR
ange
= () => {
// 获取组件实例
const r
angePicker
= document
.querySelector
('
.ant-picker-input input'
);
if(r
angePicker
) {
// 设置默认值（示例：当天日期）
r
angePicker
.value
= `${moment
().format
('YYYY-MM-DD'
)} ~ ${moment
().format
('YYYY-MM-DD'
)}`;
}
}
onMounted
(() => {
setTimeout
(setDefaultR
ange, 3
00); // 延迟确保DOM加载
}
);
</script>
```
2
. **后端接口预处理**
在返回表单数据的接口中，直接返回预设值：
```json
// 接口响应示例
{
"
dateR
ange": ["2
023-
11-
01", "2
023-
11-
07"]
}
```
### 注意事项
1. 使用 `moment` 库处理日期格式，需先安装：
```bash
npm install moment
```
2
. 当前版本（引用[^
1]）存在默认值可能失效的问题：
- 推荐升级到最新版本（关注[JeecgBoot GitHub]
(https://github
.com/jeecgboot/jeecg-boot
)）
- 临时方案中建议增加3
00ms延迟确保组件渲染完成
- 复杂场景可改用 `:default-value
="[
...]"` 属性尝试
3
. 持久化存储建议：
```javascript
// 从localStorage读取上次选择
const lastR
ange
= JSON
.parse
(localStorage
.getItem
('last
DateR
ange'
));
modelRef
.dateR
ange
= lastR
ange
|| [moment
(), moment
()];
```
日期转星期算法
本文介绍两种将具体日期转换为对应星期的方法：一种是通过预先计算并存储每年1月1日对应的星期，结合日期计算得到结果；另一种是使用基姆拉尔森计算公式直接计算。涉及C++编程实现。
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