From fd1bdec706314c47adc9f7d622526117ba56bc08 Mon Sep 17 00:00:00 2001
From: Alex <lys_yz@163.com>
Date: Fri, 2 Nov 2018 12:09:01 +0800
Subject: [PATCH] fixed bug #1285

---
 src/components/Charts/mixins/resize.js             | 11 +++++++----
 src/views/dashboard/admin/components/LineChart.vue | 11 +++++++----
 2 files changed, 14 insertions(+), 8 deletions(-)

diff --git a/src/components/Charts/mixins/resize.js b/src/components/Charts/mixins/resize.js
index dc61f859..fcfee400 100644
--- a/src/components/Charts/mixins/resize.js
+++ b/src/components/Charts/mixins/resize.js
@@ -9,14 +9,17 @@ export default {
     }, 100)
     window.addEventListener('resize', this.__resizeHandler)
 
-    const sidebarElm = document.getElementsByClassName('sidebar-container')[0]
-    sidebarElm.addEventListener('transitionend', this.sidebarResizeHandler)
+    this.sidebarElm = document.getElementsByClassName('sidebar-container')[0]
+    if (this.sidebarElm) {
+      this.sidebarElm.addEventListener('transitionend', this.sidebarResizeHandler)
+    }
   },
   beforeDestroy() {
     window.removeEventListener('resize', this.__resizeHandler)
 
-    const sidebarElm = document.getElementsByClassName('sidebar-container')[0]
-    sidebarElm.removeEventListener('transitionend', this.sidebarResizeHandler)
+    if (this.sidebarElm) {
+      this.sidebarElm.removeEventListener('transitionend', this.sidebarResizeHandler)
+    }
   },
   methods: {
     sidebarResizeHandler(e) {
diff --git a/src/views/dashboard/admin/components/LineChart.vue b/src/views/dashboard/admin/components/LineChart.vue
index ef493c4b..1f91232f 100644
--- a/src/views/dashboard/admin/components/LineChart.vue
+++ b/src/views/dashboard/admin/components/LineChart.vue
@@ -55,8 +55,10 @@ export default {
     }
 
     // 监听侧边栏的变化
-    const sidebarElm = document.getElementsByClassName('sidebar-container')[0]
-    sidebarElm.addEventListener('transitionend', this.sidebarResizeHandler)
+    this.sidebarElm = document.getElementsByClassName('sidebar-container')[0]
+    if (this.sidebarElm) {
+      this.sidebarElm.addEventListener('transitionend', this.sidebarResizeHandler)
+    }
   },
   beforeDestroy() {
     if (!this.chart) {
@@ -66,8 +68,9 @@ export default {
       window.removeEventListener('resize', this.__resizeHandler)
     }
 
-    const sidebarElm = document.getElementsByClassName('sidebar-container')[0]
-    sidebarElm.removeEventListener('transitionend', this.sidebarResizeHandler)
+    if (this.sidebarElm) {
+      this.sidebarElm.removeEventListener('transitionend', this.sidebarResizeHandler)
+    }
 
     this.chart.dispose()
     this.chart = null