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Maintain the state persistence in JavaScript QueryBuilder control

State persistence allows you to maintain the current state in the browser’s localStorage even if the browser is refreshed or if you move to the next page within the browser. State persistence stores the Query Builder’s rule object in the local storage when the enablePersistence is defined to true.

Source
Preview
app.ts
index.html
styles.css
import { QueryBuilder, ColumnsModel, RuleModel } from '@syncfusion/ej2-querybuilder';

let employeeData: Object[] = [{
      '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'
    }];

    let columnData: ColumnsModel[] = [
        {
            field: 'EmployeeID', label: 'Employee ID', type: 'number'
        },
        { field: 'FirstName', label: 'FirstName', type: 'string' },
        { field: 'TitleOfCourtesy', label: 'Title Of Courtesy', type: 'boolean', values: ['Mr.', 'Mrs.'] },
        { field: 'Title', label: 'Title', type: 'string' },
        { field: 'HireDate', label: 'HireDate', type: 'date', format: 'dd/MM/yyyy' },
        { field: 'Country', label: 'Country', type: 'string' },
        { field: 'City', label: 'City', type: 'string' }
    ];
    let importRules: RuleModel = {
        'condition': 'and',
        'rules': [{
            'label': 'Employee ID',
            'field': 'EmployeeID',
            'type': 'number',
            'operator': 'equal',
            'value': 1001
        },
        {
            'label': 'Title',
            'field': 'Title',
            'type': 'string',
            'operator': 'equal',
            'value': 'Sales Manager'
        }]
    };
    let qryBldrObj: QueryBuilder = new QueryBuilder({
        width: '70%',
        dataSource: employeeData,
        columns: columnData,
        rule: importRules,
        enablePersistence: true
    });
    qryBldrObj.appendTo('#querybuilder');
<!DOCTYPE html>
<html lang="en">

<head>
    <title>EJ2 Query Builder</title>
    <meta charset="utf-8" />
    <meta name="viewport" content="width=device-width, initial-scale=1.0" />
    <meta name="description" content="Typescript UI Controls" />
    <meta name="author" content="Syncfusion" />
    <link href="//cdn.syncfusion.com/ej2/ej2-base/styles/material.css" rel="stylesheet" />
    <link href="//cdn.syncfusion.com/ej2/ej2-buttons/styles/material.css" rel="stylesheet" />
    <link href="//cdn.syncfusion.com/ej2/ej2-splitbuttons/styles/material.css" rel="stylesheet" />
    <link href="//cdn.syncfusion.com/ej2/ej2-dropdowns/styles/material.css" rel="stylesheet" />
    <link href="//cdn.syncfusion.com/ej2/ej2-inputs/styles/material.css" rel="stylesheet" />
    <link href="//cdn.syncfusion.com/ej2/ej2-calendars/styles/material.css" rel="stylesheet" />
    <link href="//cdn.syncfusion.com/ej2/ej2-popups/styles/material.css" rel="stylesheet" />
    <link href="//cdn.syncfusion.com/ej2/ej2-querybuilder/styles/material.css" rel="stylesheet" />
    <link href="styles.css" rel="stylesheet" />
    <script src="https://cdnjs.cloudflare.com/ajax/libs/systemjs/0.19.38/system.js"></script>
    <script src="systemjs.config.js"></script>
    
</head>

<body>
    <div id='loader'>LOADING....</div>
    <div id='container'>
        <div id='querybuilder'></div>
         <div id='property'> </div>
    </div>
</body>
</html>
#container {
    visibility: hidden;
}

#loader {
  color: #008cff;
  height: 40px;
  left: 45%;
  position: absolute;
  top: 45%;
  width: 30%;
}

.e-query-builder {
  margin: 0 auto;
}