From e26e1f50ab4fb7b95ccb31edcc09aefcb4868e19 Mon Sep 17 00:00:00 2001
From: mxie <15623530290@163.com>
Date: Thu, 11 Oct 2018 10:03:42 +0800
Subject: [PATCH] feat: add prop `appendToBody`

---
 README.md                      |  2 +
 README.zh-CN.md                |  4 +-
 demo/index.js                  |  3 +-
 src/directives/clickoutside.js |  1 +
 src/index.vue                  | 76 ++++++++++++++++++++++++++++------
 src/utils/index.js             | 22 ++++++++++
 test/index.spec.js             | 10 +++++
 7 files changed, 104 insertions(+), 14 deletions(-)

diff --git a/README.md b/README.md
index 035f9cd..5dc6a67 100644
--- a/README.md
+++ b/README.md
@@ -81,6 +81,8 @@ export default {
 | disabled            | Boolean       | false       | Disable the component                               |
 | placeholder         | String        |             | input placeholder text                              |
 | width               | String/Number | 210         | input size                                          |
+| append-to-body      | Boolean       | false       | append the popup to body                            |
+| popupStyle          | Object        |             | popup style(override the top, left style)           |
 | not-before          | String/Date   | ''          | Disable all dates before new Date(not-before)       |
 | not-after           | String/Date   | ''          | Disable all dates after new Date(not-after)         |
 | disabled-days       | Array/function| []          | Disable Days                                        |
diff --git a/README.zh-CN.md b/README.zh-CN.md
index e0269ad..7bf4c91 100644
--- a/README.zh-CN.md
+++ b/README.zh-CN.md
@@ -80,7 +80,9 @@ export default {
 | editable            | Boolean       | true        | 如果是false, 用户不能手动输入更新日期                       
 | disabled            | Boolean       | false       | 禁用组件                               
 | placeholder         | String        |             | 输入框placeholder                              
-| width               | String/Number | 210         | 设置宽度                                          
+| width               | String/Number | 210         | 设置宽度                     
+| append-to-body      | Boolean       | false       | 弹出层放到body下面
+| popup-style         | Object        |             | 弹出层的样式(可以覆盖left,top样式)             
 | not-before          | String/Date   | ''          | 禁止选择这个时间之前的时间     
 | not-after           | String/Date   | ''          | 禁止选择这个时间之前=后的时间        
 | disabled-days       | Array/function| []          | 自定义禁止的日期                                        
diff --git a/demo/index.js b/demo/index.js
index 3013a0d..03438e3 100644
--- a/demo/index.js
+++ b/demo/index.js
@@ -47,7 +47,7 @@ new Vue({  // eslint-disable-line
   render (h) {
     const example1 = {
       'base': '<date-picker v-model="value1" lang="en" :not-before="new Date()"></date-picker>',
-      'range': '<date-picker v-model="value2" range ></date-picker>',
+      'range': '<date-picker v-model="value2" range appendToBody></date-picker>',
       'month': '<date-picker v-model="value10" lang="en" type="month" format="YYYY-MM"></date-picker>',
       'year': '<date-picker v-model="value11" lang="en" type="year" format="YYYY"></date-picker>',
       'time': '<date-picker v-model="value12" lang="en" type="time" format="HH:mm:ss" placeholder="Select Time"></date-picker>'
@@ -64,6 +64,7 @@ new Vue({  // eslint-disable-line
           v-model="value4"
           lang="en"
           type="datetime"
+          appendToBody
           format="YYYY-MM-DD hh:mm:ss a"
           :time-picker-options="{
             start: '00:00',
diff --git a/src/directives/clickoutside.js b/src/directives/clickoutside.js
index 3217d8e..2de0485 100644
--- a/src/directives/clickoutside.js
+++ b/src/directives/clickoutside.js
@@ -4,6 +4,7 @@ export default {
     el['@clickoutside'] = e => {
       if (
         !el.contains(e.target) &&
+        !(vnode.context.popupElm && vnode.context.popupElm.contains(e.target)) &&
         binding.expression &&
         vnode.context[binding.expression]
       ) {
diff --git a/src/index.vue b/src/index.vue
index 4f63c5d..ebea410 100644
--- a/src/index.vue
+++ b/src/index.vue
@@ -44,7 +44,7 @@
       </span>
     </div>
     <div class="mx-datepicker-popup"
-      :style="position"
+      :style="innerPopupStyle"
       v-show="popupVisible"
       ref="calendar">
       <slot name="header">
@@ -106,7 +106,7 @@
 <script>
 import fecha from 'fecha'
 import clickoutside from '@/directives/clickoutside'
-import { isValidDate, isValidRange, isDateObejct, isPlainObject, formatDate, parseDate } from '@/utils/index'
+import { isValidDate, isValidRange, isDateObejct, isPlainObject, formatDate, parseDate, throttle } from '@/utils/index'
 import CalendarPanel from './calendar.vue'
 import locale from '@/mixins/locale'
 import Languages from '@/locale/languages'
@@ -183,6 +183,13 @@ export default {
     inputClass: {
       type: [String, Array],
       default: 'mx-input'
+    },
+    appendToBody: {
+      type: Boolean,
+      default: false
+    },
+    popupStyle: {
+      type: Object
     }
   },
   data () {
@@ -290,8 +297,31 @@ export default {
         return this.format
       }
       return this.format.replace(/[Hh]+.*[msSaAZ]|\[.*?\]/g, '').trim() || 'YYYY-MM-DD'
+    },
+    innerPopupStyle () {
+      return { ...this.position, ...this.popupStyle }
     }
   },
+  mounted () {
+    if (this.appendToBody) {
+      this.popupElm = this.$refs.calendar
+      document.body.appendChild(this.popupElm)
+    }
+    this._displayPopup = throttle(() => {
+      if (this.popupVisible) {
+        this.displayPopup()
+      }
+    }, 200)
+    window.addEventListener('resize', this._displayPopup)
+    window.addEventListener('scroll', this._displayPopup)
+  },
+  beforeDestroy () {
+    if (this.popupElm && this.popupElm.parentNode === document.body) {
+      document.body.removeChild(this.popupElm)
+    }
+    window.removeEventListener('resize', this._displayPopup)
+    window.removeEventListener('scroll', this._displayPopup)
+  },
   methods: {
     initCalendar () {
       this.handleValueChange(this.value)
@@ -384,31 +414,53 @@ export default {
     closePopup () {
       this.popupVisible = false
     },
+    getPopupSize (element) {
+      const originalDisplay = element.style.display
+      const originalVisibility = element.style.visibility
+      element.style.display = 'block'
+      element.style.visibility = 'hidden'
+      const styles = window.getComputedStyle(element)
+      const width = element.offsetWidth + parseInt(styles.marginLeft) + parseInt(styles.marginRight)
+      const height = element.offsetHeight + parseInt(styles.marginTop) + parseInt(styles.marginBottom)
+      const result = { width, height }
+      element.style.display = originalDisplay
+      element.style.visibility = originalVisibility
+      return result
+    },
     displayPopup () {
       const dw = document.documentElement.clientWidth
       const dh = document.documentElement.clientHeight
       const InputRect = this.$el.getBoundingClientRect()
-      const PopupRect = this.$refs.calendar.getBoundingClientRect()
-      this.position = {}
+      const PopupRect = this._popupRect || (this._popupRect = this.getPopupSize(this.$refs.calendar))
+      const position = {}
+      let offsetRelativeToInputX = 0
+      let offsetRelativeToInputY = 0
+      if (this.appendToBody) {
+        offsetRelativeToInputX = window.pageXOffset + InputRect.left
+        offsetRelativeToInputY = window.pageYOffset + InputRect.top
+      }
       if (
         dw - InputRect.left < PopupRect.width &&
         InputRect.right < PopupRect.width
       ) {
-        this.position.left = 1 - InputRect.left + 'px'
+        position.left = offsetRelativeToInputX - InputRect.left + 1 + 'px'
       } else if (InputRect.left + InputRect.width / 2 <= dw / 2) {
-        this.position.left = 0
+        position.left = offsetRelativeToInputX + 'px'
       } else {
-        this.position.right = 0
+        position.left = offsetRelativeToInputX + InputRect.width - PopupRect.width + 'px'
       }
       if (
-        InputRect.top <= PopupRect.height + 1 &&
-        dh - InputRect.bottom <= PopupRect.height + 1
+        InputRect.top <= PopupRect.height &&
+        dh - InputRect.bottom <= PopupRect.height
       ) {
-        this.position.top = dh - InputRect.top - PopupRect.height - 1 + 'px'
+        position.top = offsetRelativeToInputY + dh - InputRect.top - PopupRect.height + 'px'
       } else if (InputRect.top + InputRect.height / 2 <= dh / 2) {
-        this.position.top = '100%'
+        position.top = offsetRelativeToInputY + InputRect.height + 'px'
       } else {
-        this.position.bottom = '100%'
+        position.top = offsetRelativeToInputY - PopupRect.height + 'px'
+      }
+      if (position.top !== this.position.top || position.left !== this.position.left) {
+        this.position = position
       }
     },
     handleInput (event) {
diff --git a/src/utils/index.js b/src/utils/index.js
index f745f13..c905017 100644
--- a/src/utils/index.js
+++ b/src/utils/index.js
@@ -69,3 +69,25 @@ export function parseDate (value, format) {
     return false
   }
 }
+
+export function throttle (action, delay) {
+  let lastRun = 0
+  let timeout = null
+  return function () {
+    if (timeout) {
+      return
+    }
+    const args = arguments
+    const elapsed = Date.now() - lastRun
+    const callBack = () => {
+      lastRun = Date.now()
+      timeout = null
+      action.apply(this, args)
+    }
+    if (elapsed >= delay) {
+      callBack()
+    } else {
+      timeout = setTimeout(callBack, delay)
+    }
+  }
+}
diff --git a/test/index.spec.js b/test/index.spec.js
index f641aeb..4e2654a 100644
--- a/test/index.spec.js
+++ b/test/index.spec.js
@@ -13,6 +13,16 @@ afterEach(() => {
 })
 
 describe('datepicker', () => {
+  it('prop: appendToBody', () => {
+    wrapper = mount(DatePicker, {
+      propsData: {
+        appendToBody: true
+      }
+    })
+    const popup = wrapper.find('.mx-datepicker-popup')
+    expect(popup.element.parentNode).toBe(document.body)
+  })
+
   it('click: pick date', () => {
     wrapper = mount(DatePicker, {
       propsData: {