From a55b149b27d85ccc9541a6e826e845e46f8a8fa3 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?=E8=8A=B1=E8=A3=A4=E8=A1=A9?= <panfree23@gmail.com>
Date: Mon, 26 Mar 2018 13:54:19 +0800
Subject: [PATCH] perf[excel]: refactor excel (#536)

---
 src/vendor/Export2Excel.js      | 54 ++++++++++++++++-----------------
 src/views/excel/exportExcel.vue | 32 ++++++++++++++++---
 src/views/excel/selectExcel.vue |  6 +++-
 3 files changed, 59 insertions(+), 33 deletions(-)

diff --git a/src/vendor/Export2Excel.js b/src/vendor/Export2Excel.js
index 803eca25..377a946b 100644
--- a/src/vendor/Export2Excel.js
+++ b/src/vendor/Export2Excel.js
@@ -116,45 +116,43 @@ export function export_table_to_excel(id) {
     saveAs(new Blob([s2ab(wbout)], {type: "application/octet-stream"}), "test.xlsx")
 }
 
-export function export_json_to_excel(th, jsonData, defaultTitle) {
-
+export function export_json_to_excel({header, data, filename='excel-list', autoWidth=true}={}) {
     /* original data */
-
-    var data = jsonData;
-    data.unshift(th);
+    data=[...data]
+    data.unshift(header);
     var ws_name = "SheetJS";
-
     var wb = new Workbook(), ws = sheet_from_array_of_arrays(data);
 
-    /*设置worksheet每列的最大宽度*/
-    const colWidth = data.map(row => row.map(val => {
-      /*先判断是否为null/undefined*/
-      if (val == null) {
-        return {'wch': 10};
-      }
-      /*再判断是否为中文*/
-      else if (val.toString().charCodeAt(0) > 255) {
-        return {'wch': val.toString().length * 2};
-      } else {
-        return {'wch': val.toString().length};
-      }
-    }))
-    /*以第一行为初始值*/
-    let result = colWidth[0];
-    for (let i = 1; i < colWidth.length; i++) {
-      for (let j = 0; j < colWidth[i].length; j++) {
-        if (result[j]['wch'] < colWidth[i][j]['wch']) {
-          result[j]['wch'] = colWidth[i][j]['wch'];
+    if(autoWidth){
+      /*设置worksheet每列的最大宽度*/
+      const colWidth = data.map(row => row.map(val => {
+        /*先判断是否为null/undefined*/
+        if (val == null) {
+          return {'wch': 10};
+        }
+        /*再判断是否为中文*/
+        else if (val.toString().charCodeAt(0) > 255) {
+          return {'wch': val.toString().length * 2};
+        } else {
+          return {'wch': val.toString().length};
+        }
+      }))
+      /*以第一行为初始值*/
+      let result = colWidth[0];
+      for (let i = 1; i < colWidth.length; i++) {
+        for (let j = 0; j < colWidth[i].length; j++) {
+          if (result[j]['wch'] < colWidth[i][j]['wch']) {
+            result[j]['wch'] = colWidth[i][j]['wch'];
+          }
         }
       }
+      ws['!cols'] = result;
     }
-    ws['!cols'] = result;
 
     /* add worksheet to workbook */
     wb.SheetNames.push(ws_name);
     wb.Sheets[ws_name] = ws;
 
     var wbout = XLSX.write(wb, {bookType: 'xlsx', bookSST: false, type: 'binary'});
-    var title = defaultTitle || 'excel-list'
-    saveAs(new Blob([s2ab(wbout)], {type: "application/octet-stream"}), title + ".xlsx")
+    saveAs(new Blob([s2ab(wbout)], {type: "application/octet-stream"}), filename + ".xlsx");
 }
diff --git a/src/views/excel/exportExcel.vue b/src/views/excel/exportExcel.vue
index be12ea4b..543ee2ee 100644
--- a/src/views/excel/exportExcel.vue
+++ b/src/views/excel/exportExcel.vue
@@ -1,8 +1,16 @@
 <template>
- <!-- $t is vue-i18n global function to translate lang -->
+  <!-- $t is vue-i18n global function to translate lang -->
   <div class="app-container">
+
+    <label class="radio-label" style="padding-left:0;">Filename: </label>
     <el-input style='width:340px;' :placeholder="$t('excel.placeholder')" prefix-icon="el-icon-document" v-model="filename"></el-input>
-    <el-button style='margin-bottom:20px;' type="primary" icon="document" @click="handleDownload" :loading="downloadLoading">{{$t('excel.export')}} excel</el-button>
+    <label class="radio-label">Cell Auto Width: </label>
+    <el-radio-group v-model="autoWidth">
+      <el-radio :label="true" border>True</el-radio>
+      <el-radio :label="false" border>False</el-radio>
+    </el-radio-group>
+    <el-button style='margin:0 0 20px 20px;' type="primary" icon="document" @click="handleDownload" :loading="downloadLoading">{{$t('excel.export')}} excel</el-button>
+
     <el-table :data="list" v-loading.body="listLoading" element-loading-text="拼命加载中" border fit highlight-current-row>
       <el-table-column align="center" label='Id' width="95">
         <template slot-scope="scope">
@@ -45,7 +53,8 @@ export default {
       list: null,
       listLoading: true,
       downloadLoading: false,
-      filename: ''
+      filename: '',
+      autoWidth: true
     }
   },
   created() {
@@ -66,7 +75,12 @@ export default {
         const filterVal = ['id', 'title', 'author', 'pageviews', 'display_time']
         const list = this.list
         const data = this.formatJson(filterVal, list)
-        excel.export_json_to_excel(tHeader, data, this.filename)
+        excel.export_json_to_excel({
+          header: tHeader,
+          data,
+          filename: this.filename,
+          autoWidth: this.autoWidth
+        })
         this.downloadLoading = false
       })
     },
@@ -82,3 +96,13 @@ export default {
   }
 }
 </script>
+
+<style>
+.radio-label {
+  font-size: 14px;
+  color: #606266;
+  line-height: 40px;
+  padding: 0 12px 0 30px;
+}
+</style>
+
diff --git a/src/views/excel/selectExcel.vue b/src/views/excel/selectExcel.vue
index bd62ade7..4e74fa14 100644
--- a/src/views/excel/selectExcel.vue
+++ b/src/views/excel/selectExcel.vue
@@ -72,7 +72,11 @@ export default {
           const filterVal = ['id', 'title', 'author', 'pageviews', 'display_time']
           const list = this.multipleSelection
           const data = this.formatJson(filterVal, list)
-          excel.export_json_to_excel(tHeader, data, this.filename)
+          excel.export_json_to_excel({
+            header: tHeader,
+            data,
+            filename: this.filename
+          })
           this.$refs.multipleTable.clearSelection()
           this.downloadLoading = false
         })