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State Persistence

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.

tagHelper
default.cs
<ejs-querybuilder id="querybuilder" width="73%" rule="ViewBag.rule" dataSource="ViewBag.dataSource" enablePersistence="true">
        <e-querybuilder-columns>
            <e-querybuilder-column field="EmployeeID" label="Employee ID" type="number"></e-querybuilder-column>
            <e-querybuilder-column field="FirstName" label="First Name" type="string"></e-querybuilder-column>
            <e-querybuilder-column field="TitleOfCourtesy" label="Title Of Courtesy" type="boolean" values="ViewBag.values"></e-querybuilder-column>
            <e-querybuilder-column field="Title" label="Title" type="string"></e-querybuilder-column>
            <e-querybuilder-column field="HireDate" label="Hire Date" type="date" format="dd/MM/yyyy"></e-querybuilder-column>
            <e-querybuilder-column field="Country" label="Country" type="string"></e-querybuilder-column>
            <e-querybuilder-column field="City" label="City" type="string"></e-querybuilder-column>
        </e-querybuilder-columns>
    </ejs-querybuilder>
public ActionResult Index()
{
    QueryBuilderRule rule = new QueryBuilderRule()
    {
        Condition = "and",
        Rules = new List<QueryBuilderRule>()
        {
            new QueryBuilderRule { Label="Employee ID", Field="EmployeeID", Type="number", Operator="equal", Value = 1 },
            new QueryBuilderRule { Label="Title", Field="Title", Type="string", Operator="equal", Value = "Sales Manager" }
        }
    };
    ViewBag.rule = rule;
    ViewBag.dataSource = EmployeeView.GetAllRecords();
    return View();
}

public class EmployeeView
{
    public EmployeeView()
    {

    }
    public EmployeeView(int EmployeeID, string FirstName, string LastName, string Title, DateTime BirthDate, DateTime HireDate, int ReportsTo, string Address, string PostalCode, string Phone, string City, string Country)
    {
        this.EmployeeID = EmployeeID;
        this.FirstName = FirstName;
        this.LastName = LastName;
        this.Title = Title;
        this.BirthDate = BirthDate;
        this.HireDate = HireDate;
        this.ReportsTo = ReportsTo;
        this.Address = Address;
        this.PostalCode = PostalCode;
        this.Phone = Phone;
        this.City = City;
        this.Country = Country;

    }
    public int EmployeeID { get; set; }
    public string FirstName { get; set; }
    public string LastName { get; set; }
    public string Title { get; set; }
    public DateTime BirthDate { get; set; }
    public DateTime HireDate { get; set; }

    public int ReportsTo { get; set; }

    public string Address { get; set; }
    public string PostalCode { get; set; }
    public string Phone { get; set; }
    public string City { get; set; }
    public string Country { get; set; }
    public static List<EmployeeView> GetAllRecords()
    {
        List<EmployeeView> Emp = new List<EmployeeView>();
        Emp.Add(new EmployeeView(1, "Nancy", "Davolio", "Sales Representative", new DateTime(1948, 12, 08), new DateTime(1992, 05, 01), 2, "507 - 20th Ave. E.Apt. 2A ", " 98122", "(206) 555-9857 ", "Seattle ", "USA"));
        Emp.Add(new EmployeeView(2, "Andrew", "Fuller", "Vice President, Sales", new DateTime(1952, 02, 19), new DateTime(1992, 08, 14), 4, "908 W. Capital Way", "98401 ", "(206) 555-9482 ", "Kirkland ", "USA"));
        Emp.Add(new EmployeeView(3, "Janet", "Leverling", "Sales Representative", new DateTime(1963, 08, 30), new DateTime(1992, 04, 01), 3, " 4110 Old Redmond Rd.", "98052 ", "(206) 555-8122", "Redmond ", "USA "));
        Emp.Add(new EmployeeView(4, "Margaret", "Peacock", "Sales Representative", new DateTime(1937, 09, 19), new DateTime(1993, 05, 03), 6, "14 Garrett Hill ", "SW1 8JR ", "(71) 555-4848 ", "London ", "UK "));
        Emp.Add(new EmployeeView(5, "Steven", "Buchanan", "Sales Manager", new DateTime(1955, 03, 04), new DateTime(1993, 10, 17), 8, "Coventry HouseMiner Rd. ", "EC2 7JR ", " (206) 555-8122", "Tacoma ", " USA"));
        Emp.Add(new EmployeeView(6, "Michael", "Suyama", "Sales Representative", new DateTime(1963, 07, 02), new DateTime(1993, 10, 17), 2, " 7 Houndstooth Rd.", " WG2 7LT", "(71) 555-4444 ", "London ", "UK "));
        Emp.Add(new EmployeeView(7, "Robert", "King", "Sales Representative", new DateTime(1960, 05, 29), new DateTime(1994, 01, 02), 7, "Edgeham HollowWinchester Way ", "RG1 9SP ", "(71) 555-5598 ", "London ", " UK"));
        Emp.Add(new EmployeeView(8, "Laura", "Callahan", "Inside Sales Coordinator", new DateTime(1958, 01, 09), new DateTime(1994, 03, 05), 9, "722 Moss Bay Blvd. ", "98033 ", " (206) 555-3412", "Seattle ", "USA "));
        Emp.Add(new EmployeeView(9, "Anne", "Dodsworth", "Sales Representative", new DateTime(1966, 01, 27), new DateTime(1994, 11, 15), 5, "4726 - 11th Ave. N.E. ", "98105 ", "(71) 555-5598 ", " London", "UK "));
        return Emp;
    }
}