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Query Builder allows you to create or delete conditions and groups. You can use ShowButtons to enable/disable these buttons.

tagHelper
default.cs
<ejs-querybuilder id="querybuilder" width="73%" rule="ViewBag.rule" showButtons="new Syncfusion.EJ2.QueryBuilder.QueryBuilderShowButtons {GroupDelete=true, GroupInsert=true, RuleDelete=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>

<ejs-button id="addgroup" cssClass='e-primary' content="Add Group"></ejs-button>
<ejs-button id="addrule" cssClass='e-primary' content="Add Rule"></ejs-button>
<ejs-button id="deletegroup" cssClass='e-primary' content="Delete Group"></ejs-button>

<script>
    document.getElementById('addgroup').onclick = function () {
        var querybuilderObj = ej.base.getInstance(document.getElementById("querybuilder"), ejs.querybuilder.QueryBuilder);
        querybuilderObj.addGroups([{ 'condition': 'and', 'rules': [{ 'label': 'First Name', 'field': 'FirstName', 'type': 'string', 'operator': 'startswith', 'value': 'v' }] }], 'group0');
    }
    document.getElementById('addrule').onclick = function () {
        var querybuilderObj = ej.base.getInstance(document.getElementById("querybuilder"), ejs.querybuilder.QueryBuilder);
        querybuilderObj.addRules([{ 'label': 'City', 'field': 'City', 'type': 'string', 'operator': 'equal', 'value': 'US' }], 'group0');
    }
    document.getElementById('deletegroup').onclick = function () {
        var querybuilderObj = ej.base.getInstance(document.getElementById("querybuilder"), ejs.querybuilder.QueryBuilder);
        querybuilderObj.deleteGroups(['group1']);
    }
</script>
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;
        }
    }

You can create or delete conditions by interacting through the user interface and methods.

  • Use the addRules and deleteRules methods to create/delete conditions.
  • Use the addGroups and deleteGroups methods to create/delete groups.