Filtering in Vue QueryBuilder component

<template>
    <div class="control-section">
        <div class="col-lg-12 querybuilder-control">
            <ejs-querybuilder width="70%" id="querybuilder" ref="querybuilder" :dataSource="dataSource" :rule="importRules" :showButtons="showButtons">
                <e-columns>
                    <e-column field='EmployeeID' label='Employee ID' type='number' />
                    <e-column field='FirstName' label='First Name' type='string' />
                    <e-column field='TitleOfCourtesy' label='Title Of Courtesy' type='boolean' :values="values"/>
                    <e-column field='Title' label='Title' type='string' />
                    <e-column field='HireDate' label='Hire Date' type='date' format='dd/MM/yyyy' />
                    <e-column field='Country' label='Country' type='string' />
                    <e-column field='City' label='City' type='string' />
                </e-columns>
            </ejs-querybuilder>
             <ejs-button cssClass="e-qb-button" :isPrimary="true" v-on:click.native="addRule">Add Rule</ejs-button>
             <ejs-button cssClass="e-qbr-button" :isPrimary="true" v-on:click.native="addGroup">Add Group</ejs-button>
             <ejs-button cssClass="e-qbr-button" :isPrimary="true" v-on:click.native="deleteGroup">Delete Group</ejs-button>
        </div>
    </div>
</template>
<script>
import Vue from "vue";
import { QueryBuilderPlugin } from "@syncfusion/ej2-vue-querybuilder";
import { ButtonPlugin } from "@syncfusion/ej2-vue-buttons";

Vue.use(ButtonPlugin);
Vue.use(QueryBuilderPlugin);

export default {
    data: function() {
        return {
            dataSource: employeeData,
            values: ['Mr.', 'Mrs.'],
            showButtons:{ruleDelete: true, groupInsert: true, groupDelete: true},
            importRules: {
                'condition': 'and',
                'rules': [{
                    'label': 'Employee ID',
                    'field': 'EmployeeID',
                    'type': 'number',
                    'operator': 'equal',
                    'value': 1
                },
                {
                    'label': 'Title',
                    'field': 'Title',
                    'type': 'string',
                    'operator': 'equal',
                    'value': 'Sales Manager'
                }]
            }
        };
    },
     methods: {
    addRule: function(event) {
       this.$refs.querybuilder.ej2Instances.addRules([{'label': 'City','field': 'City','type': 'string','operator': 'equal','value': 'US'}], 'group0');
    }
     addGroup: function(event) {
        this.$refs.querybuilder.ej2Instances.addGroups([{'condition': 'and','rules': [{'label': 'First Name','field': 'FirstName','type': 'string','operator': 'startswith','value': 'v' }]}], 'group0');
    }
     deleteGroup: function(event) {
        this.$refs.querybuilder.ej2Instances.deleteGroups(['group1']);
    }
  }
}
var employeeData = [{
      'EmployeeID': 1,
      'FirstName': 'Nancy',
      'Title': 'Sales Representative',
      'TitleOfCourtesy': 'Ms.',
      'HireDate': '22/07/2001',
      'City': 'Seattle',
      'Country': 'USA'
    },
    {
      'EmployeeID': 2,
      'FirstName': 'Andrew',
      'Title': 'Vice President',
      'TitleOfCourtesy': 'Dr.',
      'HireDate': '21/04/2003',
      'City': 'Tacoma',
      'Country': 'USA'
    },
    {
      'EmployeeID': 3,
      'FirstName': 'Janet',
      'Title': 'Sales Representative',
      'TitleOfCourtesy': 'Ms.',
      'HireDate': '22/07/2001',
      'City': 'Kirkland',
      'Country': 'USA'
    }];

</script>
<style>
    @import "../node_modules/@syncfusion/ej2-base/styles/material.css";
    @import "../node_modules/@syncfusion/ej2-buttons/styles/material.css";
    @import "../node_modules/@syncfusion/ej2-splitbuttons/styles/material.css";
    @import "../node_modules/@syncfusion/ej2-dropdowns/styles/material.css";
    @import "../node_modules/@syncfusion/ej2-inputs/styles/material.css";
    @import "../node_modules/@syncfusion/ej2-lists/styles/material.css";
    @import "../node_modules/@syncfusion/ej2-popups/styles/material.css";
    @import "../node_modules/@syncfusion/ej2-calendars/styles/material.css";
    @import "../node_modules/@syncfusion/ej2-vue-querybuilder/styles/material.css";
    .e-query-builder {
        margin: 0 auto;
    }
    .e-qb-button {
  margin: 2% 1% 0 15%;
}

.e-qbr-button {
  margin: 2% 1% 0 1%;
}

#datatable {
  margin-left: 15%;
  margin-top: 2%;
}

#datatable.e-table {
  border: solid 1px #e0e0e0;
  border-collapse: collapse;
  font-family: Roboto;
}

#datatable.e-table td, #datatable.e-table th {
  border: solid #e0e0e0;
  border-width: 1px 0 0;
  display: table-cell;
  font-size: 14px;
  line-height: 20px;
  overflow: hidden;
  padding: 8px 21px;
  vertical-align: middle;
  white-space: nowrap;
  width: auto;
}

</style>

define(["require", "exports"], function (require, exports) {
    "use strict";
    Object.defineProperty(exports, "__esModule", { value: true });
    exports.employeeData = [{
      'EmployeeID': 1,
      'LastName': 'Davolio',
      'FirstName': 'Nancy',
      'Title': 'Sales Representative',
      'TitleOfCourtesy': 'Ms.',
      'HireDate': '22/07/2001',
      'Address': '507 - 20th Ave. E.\r\nApt. 2A',
      'City': 'Seattle',
      'Region': 'WA',
      'PostalCode': '98122',
      'Country': 'USA'
    },
    {
      'EmployeeID': 2,
      'LastName': 'Fuller',
      'FirstName': 'Andrew',
      'Title': 'Vice President',
      'TitleOfCourtesy': 'Dr.',
      'HireDate': '21/04/2003',
      'Address': '908 W. Capital Way',
      'City': 'Tacoma',
      'Region': 'WA',
      'PostalCode': '98401',
      'Country': 'USA'
    },
    {
      'EmployeeID': 3,
      'LastName': 'Leverling',
      'FirstName': 'Janet',
      'Title': 'Sales Representative',
      'TitleOfCourtesy': 'Ms.',
      'HireDate': '22/07/2001',
      'Address': '722 Moss Bay Blvd.',
      'City': 'Kirkland',
      'Region': 'WA',
      'PostalCode': '98033',
      'Country': 'USA'
    },
    {
      'EmployeeID': 4,
      'LastName': 'Peacock',
      'FirstName': 'Margaret',
      'Title': 'Sales Representative',
      'TitleOfCourtesy': 'Mrs.',
      'HireDate': '22/07/2004',
      'Address': '4110 Old Redmond Rd.',
      'City': 'Redmond',
      'Region': 'WA',
      'PostalCode': '98052',
      'Country': 'USA'
    },
    {
      'EmployeeID': 5,
      'LastName': 'Buchanan',
      'FirstName': 'Steven',
      'Title': 'Sales Manager',
      'TitleOfCourtesy': 'Mr.',
      'HireDate': '02/04/2001',
      'Address': '14 Garrett Hill',
      'City': 'London',
      'Region': null,
      'PostalCode':
      'SW1 8JR',
      'Country': 'UK'
    },
    {
      'EmployeeID': 6,
      'LastName': 'Suyama',
      'FirstName': 'Michael',
      'Title': 'Sales Representative',
      'TitleOfCourtesy': 'Mr.',
      'HireDate': '22/01/2003',
      'Address': 'Coventry House\r\nMiner Rd.',
      'City': 'London',
      'Region': null,
      'PostalCode': 'EC2 7JR',
      'Country': 'UK'
    },
    {
      'EmployeeID': 7,
      'LastName': 'King',
      'FirstName': 'Robert',
      'Title': 'Sales Representative',
      'TitleOfCourtesy': 'Mr.',
      'HireDate': '22/07/2001',
      'Address': 'Edgeham Hollow\r\nWinchester Way',
      'City': 'London',
      'Region': null,
      'PostalCode': 'RG1 9SP',
      'Country': 'UK'
    },
    {
      'EmployeeID': 8,
      'LastName': 'Callahan',
      'FirstName': 'Laura',
      'Title': 'Inside Sales Coordinator',
      'TitleOfCourtesy': 'Ms.',
      'HireDate': '22/07/2001',
      'Address': '4726 - 11th Ave. N.E.',
      'City': 'Seattle',
      'Region': 'WA',
      'PostalCode': '98105',
      'Country': 'USA'
    },
    {
      'EmployeeID': 9,
      'LastName': 'Dodsworth',
      'FirstName': 'Anne',
      'Title': 'Sales Representative',
      'TitleOfCourtesy': 'Ms.',
      'HireDate': '22/07/2001',
      'Address': '7 Houndstooth Rd.',
      'City': 'London',
      'Region': null,
      'PostalCode': 'WG2 7LT',
      'Country': 'UK'
    }];
    exports.hardwareData = [{
      'TaskID': 1,
      'Name': 'Lenovo Yoga',
      'Category': 'Laptop',
      'SerialNo': 'CB27932009',
      'InvoiceNo': 'INV-2878',
      'DOP': '04/10/2018',
      'WEO': '05/01/2021',
      'Status': 'Assigned',
      'AssignedTo': 'John Doe',
      'Note': 'Remarks are noted'
  },
  {
      'TaskID': 2,
      'Name': 'Acer Aspire',
      'Category': 'Others',
      'SerialNo': 'CB35728290',
      'InvoiceNo': 'INV-3456',
      'DOP': '02/12/2018',
      'WEO': '03/01/2023',
      'Status': 'In-repair',
      'AssignedTo': '',
      'Note': 'Remarks are noted'
  },
  {
      'TaskID': 3,
      'Name': 'Apple MacBook',
      'Category': 'Laptop',
      'SerialNo': 'CB35628728',
      'InvoiceNo': 'INV-2763',
      'DOP': '04/10/2018',
      'WEO': '04/03/2021',
      'Status': 'In-repair',
      'AssignedTo': '',
      'Note': 'Remarks are noted'
  },
  {
      'TaskID': 4,
      'Name': 'Lenovo ThinkPad',
      'Category': 'Laptop',
      'SerialNo': 'CB56209872',
      'InvoiceNo': 'INV-2980',
      'DOP': '03/09/2018',
      'WEO': '05/12/2021',
      'Status': 'Pending',
      'AssignedTo': '',
      'Note': 'Remarks are noted'
  },
  {
      'TaskID': 5,
      'Name': 'Dell Inspiron',
      'Category': 'Laptop',
      'SerialNo': 'CB56289036',
      'InvoiceNo': 'INV-3782',
      'DOP': '01/10/2018',
      'WEO': '04/01/2021',
      'Status': 'Assigned',
      'AssignedTo': 'David Anto',
      'Note': 'Remarks are noted'
  },
  {
      'TaskID': 6,
      'Name': 'HP Pavilion',
      'Category': 'Laptop',
      'SerialNo': 'CB56289305',
      'InvoiceNo': 'INV-2712',
      'DOP': '04/10/2018',
      'WEO': '05/01/2021',
      'Status': 'Assigned',
      'AssignedTo': 'Mary Saveley',
      'Note': 'Remarks are noted'
  },
  {
      'TaskID': 7,
      'Name': 'Asus ZenBook',
      'Category': 'Laptop',
      'SerialNo': 'CB25637891',
      'InvoiceNo': 'INV-0984',
      'DOP': '06/16/2018',
      'WEO': '09/01/2021',
      'Status': 'Pending',
      'AssignedTo': '',
      'Note': 'Remarks are noted'
  },
  {
      'TaskID': 8,
      'Name': 'HP EliteBook',
      'Category': 'Laptop',
      'SerialNo': 'CB27819726',
      'InvoiceNo': 'INV-2561',
      'DOP': '02/19/2018',
      'WEO': '05/21/2021',
      'Status': 'Ordered',
      'AssignedTo': '',
      'Note': 'Remarks are noted'
  },
  {
      'TaskID': 9,
      'Name': 'Apple MacBook Air',
      'Category': 'Laptop',
      'SerialNo': 'CB05262880',
      'InvoiceNo': 'INV-8970',
      'DOP': '02/12/2018',
      'WEO': '03/01/2023',
      'Status': 'Pending',
      'AssignedTo': '',
      'Note': 'Remarks are noted'
  },
  {
      'TaskID': 10,
      'Name': 'Apple iPad Air',
      'Category': 'Tablet',
      'SerialNo': 'CB45262777',
      'InvoiceNo': 'INV-4555',
      'DOP': '04/10/2018',
      'WEO': '05/01/2021',
      'Status': 'Pending',
      'AssignedTo': '',
      'Note': 'Remarks are noted'
  }];
  exports.expenseData = [{
    'UniqueId': 'T100001',
    'Category': 'Food',
    'PaymentMode': 'Credit Card',
    'TransactionType': 'Expense',
    'Description': 'Boiled peanuts',
    'Amount': '7',
    'MonthShort': 'Jun',
    'MonthFull': 'June, 2017',
    'FormattedDate': '06/01/2017 09:12 AM'
  }, {
    'UniqueId': 'T100024',
    'Category': 'Food',
    'PaymentMode': 'Cash',
    'TransactionType': 'Expense',
    'Description': 'Peanuts in Coke',
    'Amount': '8',
    'MonthShort': 'Jun',
    'MonthFull': 'June, 2017',
    'FormattedDate': '06/04/2017 02:43 PM'
  }, {
    'UniqueId': 'T100025',
    'Category': 'Food',
    'PaymentMode': 'Cash',
    'TransactionType': 'Expense',
    'Description': 'Palmetto Cheese, Mint julep',
    'Amount': '11',
    'MonthShort': 'Jun',
    'MonthFull': 'June, 2017',
    'FormattedDate': '06/04/2017 08:35 PM'
  }, {
    'UniqueId': 'T100026',
    'Category': 'Transportation',
    'PaymentMode': 'Debit Card',
    'TransactionType': 'Expense',
    'Description': 'Cars and trucks, used',
    'Amount': '9',
    'MonthShort': 'Jun',
    'MonthFull': 'June, 2017',
    'FormattedDate': '06/04/2017 10:25 AM'
  }, {
    'UniqueId': 'T100027',
    'Category': 'Transportation',
    'PaymentMode': 'Debit Card',
    'TransactionType': 'Expense',
    'Description': 'Public and other transportation',
    'Amount': '8',
    'MonthShort': 'Jun',
    'MonthFull': 'June, 2017',
    'FormattedDate': '06/04/2017 03:55 PM'
  }, {
    'UniqueId': 'T100028',
    'Category': 'Shopping',
    'PaymentMode': 'Cash',
    'TransactionType': 'Expense',
    'Description': 'Household things \u0026 Utilities',
    'Amount': '160',
    'MonthShort': 'Jun',
    'MonthFull': 'June, 2017',
    'FormattedDate': '06/04/2017 10:22 AM'
  },
{
    'UniqueId': 'T101284',
    'Category': 'Extra income',
    'PaymentMode': 'Cash',
    'TransactionType': 'Income',
    'Description': 'Income from Sale',
    'Amount': '110',
    'MonthShort': 'Nov',
    'MonthFull': 'November, 2017',
    'FormattedDate': '11/30/2017 02:42 PM'
  }];
});