<template>
<div>
 <el-input v-model="tableDataName" placeholder="請輸入姓名" ></el-input>
 <el-button type="primary" @click="doFilter">搜索</el-button>
 <el-button type="primary" @click="openData">展示數據</el-button>
 <el-table
 :data="tableDataEnd"
 border
 >
 <el-table-column
  prop="date"
  label="日期"
  width="180">
 </el-table-column>
 <el-table-column
  prop="name"
  label="姓名"
  width="180">
 </el-table-column>
 <el-table-column
  prop="address"
  label="地址">
 </el-table-column>
 </el-table>
 <el-pagination
  @size-change="handleSizeChange"
  @current-change="handleCurrentChange"
  :current-page="currentPage"
  :page-sizes="[1, 2, 3, 4]"
  :page-size="pageSize"
  layout="total, sizes, prev, pager, next, jumper"
  :total="totalItems">
 </el-pagination>
</div>
</template>
<script>
export default {
 data() {
 return {
  tableDataBegin: [
  {
   date: "2016-05-01",
   name: "王小虎",
   address: "上海市普陀區金沙江路 1518 弄"
  },
  {
   date: "2016-05-02",
   name: "王小虎",
   address: "上海市普陀區金沙江路 1517 弄"
  },
  {
   date: "2016-05-03",
   name: "王二虎",
   address: "上海市普陀區金沙江路 1519 弄"
  },
  {
   date: "2016-05-04",
   name: "王二虎",
   address: "上海市普陀區金沙江路 1516 弄"
  },
  {
   date: "2016-05-05",
   name: "王三虎",
   address: "上海市普陀區金沙江路 1518 弄"
  },
  {
   date: "2016-05-06",
   name: "王三虎",
   address: "上海市普陀區金沙江路 1517 弄"
  },
  {
   date: "2016-05-07",
   name: "王小虎",
   address: "上海市普陀區金沙江路 1519 弄"
  },
  {
   date: "2016-05-08",
   name: "王小虎",
   address: "上海市普陀區金沙江路 1516 弄"
  }
  ],
  tableDataName: "",
  tableDataEnd: [],
  currentPage: 4,
  pageSize: 2,
  totalItems: 0,
  filterTableDataEnd:[],
  flag:false
 };
 },
 created() {
 this.totalItems = this.tableDataBegin.length;
 if (this.totalItems > this.pageSize) {
  for (let index = 0; index < this.pageSize; index++) {
  this.tableDataEnd.push(this.tableDataBegin[index]);
  }
 } else {
  this.tableDataEnd = this.tableDataBegin;
 }
 },
 methods: {
 //前端搜索功能需要區分是否檢索,因為對應的字段的索引不同
 //用兩個變量接收currentChangePage函數的參數
 doFilter() {
  if (this.tableDataName == "") {
  this.$message.warning("查詢條件不能為空！");
  return;
  }
  this.tableDataEnd = []
  //每次手動將數據置空,因為會出現多次點擊搜索情況
  this.filterTableDataEnd=[]
  this.tableDataBegin.forEach((value, index) => {
  if(value.name){
   if(value.name.indexOf(this.tableDataName)>=0){
   this.filterTableDataEnd.push(value)
   }
  }
  });
  //頁面數據改變重新統計數據數量和當前頁
  this.currentPage=1
  this.totalItems=this.filterTableDataEnd.length
  //渲染表格,根據值
  this.currentChangePage(this.filterTableDataEnd)
  //頁面初始化數據需要判斷是否檢索過
  this.flag=true
 },
 openData() {},
 handleSizeChange(val) {
  console.log(`每頁 ${val} 條`);
  this.pageSize = val;
  this.handleCurrentChange(this.currentPage);
 },
 handleCurrentChange(val) {
  console.log(`當前頁: ${val}`);
  this.currentPage = val;
  //需要判斷是否檢索
  if(!this.flag){
  this.currentChangePage(this.tableDataEnd)
  }else{
  this.currentChangePage(this.filterTableDataEnd)  
  }
 }, //組件自帶監控當前頁碼
 currentChangePage(list) {
  let from = (this.currentPage - 1) * this.pageSize;
  let to = this.currentPage * this.pageSize;
  this.tableDataEnd = [];
  for (; from < to; from++) {
  if (list[from]) {
   this.tableDataEnd.push(list[from]);
  }
  }
 }
 }
};
</script>