Immutable Mode in Vue Grid component

<template>
    <div id="app">
        <table>
      <tbody>
        <tr>
          <td>
            <span id="immutableDelete"></span>
          </td>
        </tr>
        <tr>
          <td>
            <span id="normalDelete"></span>
          </td>
        </tr>
        <tr>
          <td>
            <div>
              <ejs-button cssClass="e-info" v-on:click.native="addTopEvent"
                >Add 5 rows at top</ejs-button
              >
              <ejs-button cssClass="e-info" v-on:click.native="addBottomEvent"
                >Add 5 rows at bottom</ejs-button
              >
              <ejs-button cssClass="e-info" v-on:click.native="deleteEvent"
                >Delete 5 rows</ejs-button
              >
              <ejs-button cssClass="e-info" v-on:click.native="sortEvent"
                >Sort Order ID</ejs-button
              >
              <ejs-button cssClass="e-info" v-on:click.native="pageEvent"
                >Paging</ejs-button
              >
            </div>
          </td>
        </tr>
        <tr>
          <td>
            <span><b>Immutable Grid</b></span>
            <ejs-grid
              ref="immutablegrid"
              :dataSource="data"
              height="250"
              :enableImmutableMode="true"
              :allowPaging="true"
              :pageSettings="pageSettings"
              :beforeDataBound="immutableBeforeDataBound"
              :dataBound="immutableDataBound"
            >
              <e-columns>
                <e-column
                  field="OrderID"
                  headerText="Order ID"
                  width="120"
                  isPrimaryKey="true"
                  textAlign="Right"
                ></e-column>
                <e-column
                  field="ProductName"
                  headerText="Product Name"
                  width="160"
                ></e-column>
                <e-column
                  field="ProductID"
                  headerText="Product ID"
                  width="120"
                  textAlign="Right"
                ></e-column>
                <e-column
                  field="CustomerID"
                  headerText="Customer ID"
                  width="120"
                ></e-column>
                <e-column
                  field="CustomerName"
                  headerText="Customer Name"
                  width="160"
                ></e-column>
              </e-columns>
            </ejs-grid>
          </td>
        </tr>
        <tr>
          <td>
            <span><b>Normal Grid</b></span>
            <ejs-grid
              ref="nomalgrid"
              :dataSource="data"
              height="250"
              :allowPaging="true"
              :pageSettings="pageSettings"
              :beforeDataBound="beforeDataBound"
              :dataBound="dataBound"
            >
              <e-columns>
                <e-column
                  field="OrderID"
                  headerText="Order ID"
                  width="120"
                  isPrimaryKey="true"
                  textAlign="Right"
                ></e-column>
                <e-column
                  field="ProductName"
                  headerText="Product Name"
                  width="160"
                ></e-column>
                <e-column
                  field="ProductID"
                  headerText="Product ID"
                  width="120"
                  textAlign="Right"
                ></e-column>
                <e-column
                  field="CustomerID"
                  headerText="Customer ID"
                  width="120"
                ></e-column>
                <e-column
                  field="CustomerName"
                  headerText="Customer Name"
                  width="160"
                ></e-column>
              </e-columns>
            </ejs-grid>
          </td>
        </tr>
      </tbody>
    </table>
  </div>
</template>

<script>
import Vue from "vue";
import { GridPlugin, Page } from "@syncfusion/ej2-vue-grids";
import { ButtonPlugin } from "@syncfusion/ej2-vue-buttons";
import { data } from "./datasource.js";

Vue.use(GridPlugin);
Vue.use(ButtonPlugin);

export default {
  data() {
    return {
      data: data,
      pageSettings: { pageSize: 50 },
      immutableStart: 0,
      normalStart: 0,
      primaryKey: 0,
      immutableInit: true,
      init: true
    };
  },
  provide: {
    grid: [Page],
  },
  methods: {
    addTopEvent: function () {
      let immutableInstance = this.$refs.immutablegrid;
      let instance = this.$refs.nomalgrid;
      let addedRecords = [
        { OrderID: ++this.primaryKey,
          ProductName: "Chai",
          ProductID: "Sasquatch Ale",
          CustomerID: "QUEDE",
          CustomerName: "Yoshi Tannamuri",
        },
        {
          OrderID: ++this.primaryKey,
          ProductName: "Georg Pipps",
          ProductID: "Valkoinen suklaa",
          CustomerID: "RATTC",
          CustomerName: "Martín Sommer",
        },
        {
          OrderID: ++this.primaryKey,
          ProductName: "Yoshi Tannamuri",
          ProductID: "Gula Malacca",
          CustomerID: "COMMI",
          CustomerName: "Ann Devon",
        },
        {
          OrderID: ++this.primaryKey,
          ProductName: "Palle Ibsen",
          ProductID: "Rogede sild",
          CustomerID: "RATTC",
          CustomerName: "Paula Wilson",
        },
        {
          OrderID: ++this.primaryKey,
          ProductName: "Francisco Chang",
          ProductID: "Mascarpone Fabioli",
          CustomerID: "ROMEY",
          CustomerName: "Jose Pavarotti",
        },
      ];
      let aData = addedRecords.concat(immutableInstance.dataSource);
      instance.setProperties({ dataSource: aData });
      immutableInstance.setProperties({ dataSource: aData });
    },
    addBottomEvent: function () {
      let immutableInstance = this.$refs.immutablegrid;
      let instance = this.$refs.nomalgrid;
      let addedRecords = [
        {
          OrderID: ++this.primaryKey,
          ProductName: "Chai",
          ProductID: "Sasquatch Ale",
          CustomerID: "QUEDE",
          CustomerName: "Yoshi Tannamuri",
        },
        {
          OrderID: ++this.primaryKey,
          ProductName: "Georg Pipps",
          ProductID: "Valkoinen suklaa",
          CustomerID: "RATTC",
          CustomerName: "Martín Sommer",
        },
        {
          OrderID: ++this.primaryKey,
          ProductName: "Yoshi Tannamuri",
          ProductID: "Gula Malacca",
          CustomerID: "COMMI",
          CustomerName: "Ann Devon",
        },
        {
          OrderID: ++this.primaryKey,
          ProductName: "Palle Ibsen",
          ProductID: "Rogede sild",
          CustomerID: "RATTC",
          CustomerName: "Paula Wilson",
        },
        {
          OrderID: ++this.primaryKey,
          ProductName: "Francisco Chang",
          ProductID: "Mascarpone Fabioli",
          CustomerID: "ROMEY",
          CustomerName: "Jose Pavarotti",
        },
      ];
      let aData = immutableInstance.dataSource.concat(addedRecords);
      instance.setProperties({ dataSource: aData });
      immutableInstance.setProperties({ dataSource: aData });
    },
    deleteEvent: function () {
      let immutableInstance = this.$refs.immutablegrid;
      let instance = this.$refs.nomalgrid;
      immutableInstance.dataSource.splice(0, 5);
      instance.setProperties({ dataSource: immutableInstance.dataSource });
      immutableInstance.setProperties({
        dataSource: immutableInstance.dataSource,
      });
    },
    sortEvent: function () {
      let immutableInstance = this.$refs.immutablegrid;
      let instance = this.$refs.nomalgrid;
      let aData = immutableInstance.dataSource.reverse();
      instance.setProperties({ dataSource: aData });
      immutableInstance.setProperties({ dataSource: aData });
    },
    pageEvent: function () {
      let immutableInstance = this.$refs.immutablegrid;
      let instance = this.$refs.nomalgrid;
      let totalPage =
        immutableInstance.dataSource.length /
        immutableInstance.pageSettings.pageSize;
      let page = Math.floor(Math.random() * totalPage) + 1;
      instance.setProperties({ pageSettings: { currentPage: page } });
      immutableInstance.setProperties({ pageSettings: { currentPage: page } });
    },
    immutableBeforeDataBound: function () {
      this.immutableStart = new Date().getTime();
    },
    immutableDataBound: function () {
      let val = this.immutableInit ? '' : new Date().getTime() - this.immutableStart;
      document.getElementById("immutableDelete").innerHTML =
        "Immutable rendering Time: " + "<b>" + val + "</b>" + "<b>ms</b>";
      this.immutableStart = 0; this.immutableInit = false;
    },
    beforeDataBound: function () {
      this.normalStart = new Date().getTime();
    },
    dataBound: function () {
      let val = this.init ? '' : new Date().getTime() - this.normalStart;
      document.getElementById("normalDelete").innerHTML =
        "Normal rendering Time: " + "<b>" + val + "</b>" + "<b>ms</b>";
      this.normalStart = 0; this.init = false;
    },
  },
};
</script>
<style>
.e-grid {
  pointer-events: none;
}
 @import "../node_modules/@syncfusion/ej2-vue-grids/styles/material.css";
</style>

define(["require", "exports"], function (require, exports) {
   "use strict";
   Object.defineProperty(exports, "__esModule", { value: true });
   exports.data = createLazyLoadData();
   function createLazyLoadData() {
      var lazyLoadData = [];
      var customerid = ['VINET', 'TOMSP', 'HANAR', 'VICTE', 'SUPRD', 'HANAR', 'CHOPS', 'RICSU', 'WELLI', 'HILAA',
         'ERNSH', 'CENTC', 'OTTIK', 'QUEDE', 'RATTC', 'ERNSH', 'FOLKO', 'BLONP', 'WARTH', 'FRANK', 'GROSR', 'WHITC', 'WARTH',
         'SPLIR', 'RATTC', 'QUICK', 'VINET', 'MAGAA', 'TORTU', 'MORGK', 'BERGS', 'LEHMS', 'BERGS', 'ROMEY', 'ROMEY', 'LILAS',
         'LEHMS', 'QUICK', 'QUICK', 'RICAR', 'REGGC', 'BSBEV', 'COMMI', 'QUEDE', 'TRADH', 'TORTU', 'RATTC', 'VINET', 'LILAS',
         'BLONP', 'HUNGO', 'RICAR', 'MAGAA', 'WANDK', 'SUPRD', 'GODOS', 'TORTU', 'OLDWO', 'ROMEY', 'LONEP', 'ANATR', 'HUNGO',
         'THEBI', 'DUMON', 'WANDK', 'QUICK', 'RATTC', 'ISLAT', 'RATTC', 'LONEP', 'ISLAT', 'TORTU', 'WARTH', 'ISLAT', 'PERIC',
         'KOENE', 'SAVEA', 'KOENE', 'BOLID', 'FOLKO', 'FURIB', 'SPLIR', 'LILAS', 'BONAP', 'MEREP', 'WARTH', 'VICTE',
         'HUNGO', 'PRINI', 'FRANK', 'OLDWO', 'MEREP', 'BONAP', 'SIMOB', 'FRANK', 'LEHMS', 'WHITC', 'QUICK', 'RATTC', 'FAMIA'];
      var product = ['Chai', 'Chang', 'Aniseed Syrup', 'Chef Anton\'s Cajun Seasoning', 'Chef Anton\'s Gumbo Mix',
         'Grandma\'s Boysenberry Spread', 'Uncle Bob\'s Organic Dried Pears', 'Northwoods Cranberry Sauce', 'Mishi Kobe Niku',
         'Ikura', 'Queso Cabrales', 'Queso Manchego La Pastora', 'Konbu', 'Tofu', 'Genen Shouyu', 'Pavlova', 'Alice Mutton',
         'Carnarvon Tigers', 'Teatime Chocolate Biscuits', 'Sir Rodney\'s Marmalade', 'Sir Rodney\'s Scones',
         'Gustaf\'s Knäckebröd', 'Tunnbröd', 'Guaraná Fantástica', 'NuNuCa Nuß-Nougat-Creme', 'Gumbär Gummibärchen',
         'Schoggi Schokolade', 'Rössle Sauerkraut', 'Thüringer Rostbratwurst', 'Nord-Ost Matjeshering', 'Gorgonzola Telino',
         'Mascarpone Fabioli', 'Geitost', 'Sasquatch Ale', 'Steeleye Stout', 'Inlagd Sill',
         'Gravad lax', 'Côte de Blaye', 'Chartreuse verte', 'Boston Crab Meat', 'Jack\'s New England Clam Chowder',
         'Singaporean Hokkien Fried Mee', 'Ipoh Coffee', 'Gula Malacca', 'Rogede sild', 'Spegesild', 'Zaanse koeken',
         'Chocolade', 'Maxilaku', 'Valkoinen suklaa', 'Manjimup Dried Apples', 'Filo Mix', 'Perth Pasties',
         'Tourtière', 'Pâté chinois', 'Gnocchi di nonna Alice', 'Ravioli Angelo', 'Escargots de Bourgogne',
         'Raclette Courdavault', 'Camembert Pierrot', 'Sirop d\'érable',
         'Tarte au sucre', 'Vegie-spread', 'Wimmers gute Semmelknödel', 'Louisiana Fiery Hot Pepper Sauce',
         'Louisiana Hot Spiced Okra', 'Laughing Lumberjack Lager', 'Scottish Longbreads',
         'Gudbrandsdalsost', 'Outback Lager', 'Flotemysost', 'Mozzarella di Giovanni', 'Röd Kaviar', 'Longlife Tofu',
         'Rhönbräu Klosterbier', 'Lakkalikööri', 'Original Frankfurter grüne Soße'];
      var customername = ['Maria', 'Ana Trujillo', 'Antonio Moreno', 'Thomas Hardy', 'Christina Berglund',
         'Hanna Moos', 'Frédérique Citeaux', 'Martín Sommer', 'Laurence Lebihan', 'Elizabeth Lincoln',
         'Victoria Ashworth', 'Patricio Simpson', 'Francisco Chang', 'Yang Wang', 'Pedro Afonso', 'Elizabeth Brown',
         'Sven Ottlieb', 'Janine Labrune', 'Ann Devon', 'Roland Mendel', 'Aria Cruz', 'Diego Roel',
         'Martine Rancé', 'Maria Larsson', 'Peter Franken', 'Carine Schmitt', 'Paolo Accorti', 'Lino Rodriguez',
         'Eduardo Saavedra', 'José Pedro Freyre', 'André Fonseca', 'Howard Snyder', 'Manuel Pereira',
         'Mario Pontes', 'Carlos Hernández', 'Yoshi Latimer', 'Patricia McKenna', 'Helen Bennett', 'Philip Cramer',
         'Daniel Tonini', 'Annette Roulet', 'Yoshi Tannamuri', 'John Steel', 'Renate Messner', 'Jaime Yorres',
         'Carlos González', 'Felipe Izquierdo', 'Fran Wilson', 'Giovanni Rovelli', 'Catherine Dewey', 'Jean Fresnière',
         'Alexander Feuer', 'Simon Crowther', 'Yvonne Moncada', 'Rene Phillips', 'Henriette Pfalzheim',
         'Marie Bertrand', 'Guillermo Fernández', 'Georg Pipps', 'Isabel de Castro', 'Bernardo Batista', 'Lúcia Carvalho',
         'Horst Kloss', 'Sergio Gutiérrez', 'Paula Wilson', 'Maurizio Moroni', 'Janete Limeira', 'Michael Holz',
         'Alejandra Camino', 'Jonas Bergulfsen', 'Jose Pavarotti', 'Hari Kumar', 'Jytte Petersen', 'Dominique Perrier',
         'Art Braunschweiger', 'Pascale Cartrain', 'Liz Nixon', 'Liu Wong', 'Karin Josephs', 'Miguel Angel Paolino',
         'Anabela Domingues', 'Helvetius Nagy', 'Palle Ibsen', 'Mary Saveley', 'Paul Henriot', 'Rita Müller',
         'Pirkko Koskitalo', 'Paula Parente', 'Karl Jablonski', 'Matti Karttunen', 'Zbyszek Piestrzeniewicz'];
      var customeraddress = ['507 - 20th Ave. E.\r\nApt. 2A', '908 W. Capital Way', '722 Moss Bay Blvd.',
         '4110 Old Redmond Rd.', '14 Garrett Hill', 'Coventry House\r\nMiner Rd.', 'Edgeham Hollow\r\nWinchester Way',
         '4726 - 11th Ave. N.E.', '7 Houndstooth Rd.', '59 rue de l\'Abbaye', 'Luisenstr. 48', '908 W. Capital Way',
         '722 Moss Bay Blvd.', '4110 Old Redmond Rd.', '14 Garrett Hill', 'Coventry House\r\nMiner Rd.',
         'Edgeham Hollow\r\nWinchester Way',
         '7 Houndstooth Rd.', '2817 Milton Dr.', 'Kirchgasse 6', 'Sierras de Granada 9993', 'Mehrheimerstr. 369',
         'Rua da Panificadora, 12', '2817 Milton Dr.', 'Mehrheimerstr. 369'];
      var quantityperunit = ['10 boxes x 20 bags', '24 - 12 oz bottles', '12 - 550 ml bottles',
         '48 - 6 oz jars', '36 boxes', '12 - 8 oz jars', '12 - 1 lb pkgs.', '12 - 12 oz jars',
         '18 - 500 g pkgs.', '12 - 200 ml jars',
         '1 kg pkg.', '10 - 500 g pkgs.', '2 kg box', '40 - 100 g pkgs.', '24 - 250 ml bottles', '32 - 500 g boxes',
         '20 - 1 kg tins', '16 kg pkg.', '10 boxes x 12 pieces', '30 gift boxes', '24 pkgs. x 4 pieces', '24 - 500 g pkgs.',
         '12 - 250 g pkgs.',
         '12 - 355 ml cans', '20 - 450 g glasses', '100 - 250 g bags'];
      var orderID = 10248;
      var k = 1;
      for (var i = 0; i < 1000; i++) {
         k = k > 9 ? 1 : k;
         lazyLoadData.push({
            'OrderID': orderID + i,
            'CustomerID': customerid[Math.floor(Math.random() * customerid.length)],
            'CustomerName': customername[Math.floor(Math.random() * customername.length)],
            'CustomerAddress': customeraddress[Math.floor(Math.random() * customeraddress.length)],
            'ProductName': product[Math.floor(Math.random() * product.length)],
            'ProductID': i,
            'Quantity': quantityperunit[Math.floor(Math.random() * quantityperunit.length)],
            'Id': k
         });
         k++;
      }
      return lazyLoadData;
   }
});