Paging

Paging is a very important query in DataManager that is used to display only some records from the large data source. Here, you can learn the paging query in detail.

Default

The paging index and the paging size parameters of the paging query determines the number of records to be retrieved from the data source of the DataManager.

Refer to the following code example for the paging options.

  • html
  • <div class="datatable">
            <table id="table1" class="table table-striped table-bordered" style="width:700px">
                <thead>
                    <tr>
                        <th>Order ID</th>
                        <th>Customer ID</th>
                        <th>Employee ID</th>
                        <th>Freight</th>
                        <th>Ship Country</th>
                    </tr>
                </thead>
                <tbody></tbody>
            </table>
        </div>
        <script type="text/javascript">
            $(function () {// Document is ready.
                //oData Adaptor with DataManager
                var dataManager = ej.DataManager({
                    url: "http://mvc.syncfusion.com/Services/Northwnd.svc/"            
                });
                var query = ej.Query()            
                    .from("Orders")
                    .select("OrderID", "CustomerID", " EmployeeID", "Freight", "ShipCountry")
                    .page(3,10)
                    .where("CustomerID", "contains", "A", false);
                var execute = dataManager.executeQuery(query) // executing query
                        .done(function (e) {
                            $("#table1 tbody").html($("#tableTemplate").render(e.result));
                        });
            });
        </script>
        <script id="tableTemplate" type="text/x-jsrender">
            <tr>
                <td>{{>OrderID}}</td>
                <td>{{>CustomerID}}</td>
                <td>{{>EmployeeID}}</td>
                <td>{{>Freight}}</td>
                <td>{{>ShipCountry}}</td>       
            </tr>
        </script>

    Result for the above code example is illustrated as follows.

    Dynamic Paging

    The paging operation can be dynamically performed using the DataManager. With the help of an external button click event, the required page records can be obtained and processed accordingly. The following code example illustrates the dynamic paging.

  • html
  • Page index: <input type="text" value="1" id="index"/>
        Page Size: <input type="text" value="1" id="size"/>
        <input type="button" value="Execute" id="paging"/>
        <br/>
        <div class="datatable">
            <table id="table1" class="table table-striped table-bordered" style="width:700px">
                <thead>
                    <tr>
                        <th>Order ID</th>
                        <th>Customer ID</th>
                        <th>Employee ID</th>
                        <th>Ship City</th>
                    </tr>
                </thead>
                <tbody></tbody>
            </table>
        </div>
        <script type="text/javascript">
        $(function () {// Document is ready.
            data = ej.DataManager({
            url:"http://mvc.syncfusion.com/Services/Northwnd.svc/Orders"});
            var query = ej.Query().select("OrderID", "CustomerID", "EmployeeID", "ShipCity").page(1,5)
            var execute = data.executeQuery(query) // executing query
                    .done(function (e) {
                        $("#table1 tbody").html($("#tableTemplate").render(e.result));
                    });
            $("#paging").click(function () {
                var query = ej.Query().select("OrderID", "CustomerID", "EmployeeID", "ShipCity").page(
                function () {
                    if($('#index').val() !="")
                        return $('#index').val();
                    else
                        return 1; 
                },
                function () {
                    if($('#size').val() !="")
                        return $('#size').val();
                    else
                        return 2; 
                });
                var execute = data.executeQuery(query) // executing query
                        .done(function (e) {
                            $("#table1 tbody").html($("#tableTemplate").render(e.result));
                        });
            });
        });             
            
        </script>
        <script id="tableTemplate" type="text/x-jsrender">
            <tr>
                <td>{{>OrderID}}</td>
                <td>{{>CustomerID}}</td>
                <td>{{>EmployeeID}}</td>
                <td>{{>ShipCountry}}</td>    
            </tr>
        </script>

    Result of above code example is illustrated as follows.

    Custom paging

    In this section, you can learn how to use customized paging. The following code example illustrates the custom paging.

  • html
  • <div class="datatable">
            <table id="table1" class="table table-striped table-bordered" style="width:700px">
                <thead>
                    <tr>
                    <th>Order ID</th>
                    <th>Customer ID</th>
                    <th>Employee ID</th>
                    <th>Freight</th>
                    <th>Ship Country</th>
                    </tr>
                </thead>
                <tbody></tbody>
            </table>
        </div>
        <script type="text/javascript">
            $(function () {// Document is ready.
                //oData Adaptor with DataManager
                var dataManager = ej.DataManager({
                    url: "http://mvc.syncfusion.com/Services/Northwnd.svc/"            
                });
                var query = ej.Query()            
                    .from("Orders")
                    .select("OrderID", "CustomerID", " EmployeeID", "Freight", "ShipCountry")
                    .addParams("PageNumber",5)
                    .addParams("PageSize",5)
                    .where("CustomerID", "contains", "A", false);
                var execute = dataManager.executeQuery(query) // executing query
                        .done(function (e) {
                            $("#table1 tbody").html($("#tableTemplate").render(e.result));
                        });
            });
        </script>
        <script id="tableTemplate" type="text/x-jsrender">
            <tr>
                <td>{{>OrderID}}</td>
                <td>{{>CustomerID}}</td>
                <td>{{>EmployeeID}}</td>
                <td>{{>Freight}}</td>
                <td>{{>ShipCountry}}</td>    
            </tr>
        </script>

    Result of above code example is illustrated as follows.

    Skip

    The skip query is used to skip some number of records.

  • html
  • <div class="datatable">
            <table id="table1" class="table table-striped table-bordered" style="width:700px">
                <thead>
                    <tr>
                        <th>Order ID</th>
                        <th>Customer ID</th>
                        <th>Employee ID</th>
                        <th>Freight</th>
                        <th>Ship Country</th>
                    </tr>
                </thead>
                <tbody></tbody>
            </table>
        </div>
        <script type="text/javascript">
            $(function () {// Document is ready.
                //oData Adaptor with DataManager
                var dataManager = ej.DataManager({
                    url: "http://mvc.syncfusion.com/Services/Northwnd.svc/"            
                });
                var query = ej.Query()            
                    .from("Orders")
                    .select("OrderID", "CustomerID", " EmployeeID", "Freight", "ShipCountry")
                    .skip(820)            
                var execute = dataManager.executeQuery(query) // executing query
                        .done(function (e) {
                            $("#table1 tbody").html($("#tableTemplate").render(e.result));
                        });
            });
        </script>
        <script id="tableTemplate" type="text/x-jsrender">
            <tr>
                <td>{{>OrderID}}</td>
                <td>{{>CustomerID}}</td>
                <td>{{>EmployeeID}}</td>
                <td>{{>Freight}}</td>
                <td>{{>ShipCountry}}</td>         
            </tr>
        </script>

    Result of the above code example is illustrated as follows.

    Take

    The take query is used to get some certain number of records from the data source of the DataManager.

  • html
  • <div class="datatable">
            <table id="table1 class="table table-striped table-bordered" style="width:700px">
                <thead>
                    <tr>
                        <th>Order ID</th>
                        <th>Customer ID</th>
                        <th>Employee ID</th>
                        <th>Freight</th>
                        <th>Ship Country</th>
                    </tr>
                </thead>
                <tbody></tbody>
            </table>
        </div>
        <script type="text/javascript">
            $(function () {// Document is ready.
                //oData Adaptor with DataManager
                var dataManager = ej.DataManager({
                    url: "http://mvc.syncfusion.com/Services/Northwnd.svc/"            
                });
                var query = ej.Query()            
                    .from("Orders")
                    .select("OrderID", "CustomerID", " EmployeeID", "Freight", "ShipCountry")
                    .take(10)            
                var execute = dataManager.executeQuery(query) // executing query
                        .done(function (e) {
                            $("#table1 tbody").html($("#tableTemplate").render(e.result));
                        });
            });
        </script>
        <script id="tableTemplate" type="text/x-jsrender">
            <tr>
                <td>{{>OrderID}}</td>
                <td>{{>CustomerID}}</td>
                <td>{{>EmployeeID}}</td>
                <td>{{>Freight}}</td>
                <td>{{>ShipCountry}}</td>         
            </tr>
        </script>

    Result of the above code example is illustrated as follows.

    RequiresCount

    The requiresCount query is used to get the count of the total number of records in the data source of the DataManager.

  • html
  • <div class="datatable">
            <table id="table1" class="table table-striped table-bordered" style="width:700px">
                <thead>
                    <tr>
                        <th>Order ID</th>
                        <th>Customer ID</th>
                        <th>Employee ID</th>
                        <th>Freight</th>
                        <th>Ship Country</th>
                    </tr>
                </thead>
                <tbody></tbody>
            </table>
            Total Records: <span id="totalCount"></span>
        </div>
        <script type="text/javascript">
            $(function () {// Document is ready.
                //oData Adaptor with DataManager
                var dataManager = ej.DataManager({
                    url: "http://mvc.syncfusion.com/Services/Northwnd.svc/"            
                });
                var query = ej.Query()            
                    .from("Orders")
                    .select("OrderID", "CustomerID", " EmployeeID", "Freight", "ShipCountry")
                    .page(1,5)
                    .requiresCount()            
                var execute = dataManager.executeQuery(query) // executing query
                        .done(function (e) {
                            $("#table1 tbody").html($("#tableTemplate").render(e.result));
                            $("#totalCount").html(e.count)
                        });
            });
        </script>
        <script id="tableTemplate" type="text/x-jsrender">
            <tr>
                <td>{{>OrderID}}</td>
                <td>{{>CustomerID}}</td>
                <td>{{>EmployeeID}}</td>
                <td>{{>Freight}}</td>
                <td>{{>ShipCountry}}</td>           
            </tr>  
        </script>

    Result of the above code example is illustrated as follows.

    Range

    The range query is used to get some particular range of records from the data source of the DataManager.

  • html
  • <div class="datatable">
            <table id="table1" class="table table-striped table-bordered" style="width:700px">
                <thead>
                    <tr>
                        <th>Order ID</th>
                        <th>Customer ID</th>
                        <th>Employee ID</th>
                        <th>Freight</th>
                        <th>Ship Country</th>
                    </tr>
                </thead>
                <tbody></tbody>
            </table>
        </div>
        <script type="text/javascript">
            $(function () {// Document is ready.
                //oData Adaptor with DataManager
                var dataManager = ej.DataManager({
                    url: "http://mvc.syncfusion.com/Services/Northwnd.svc/"            
                });
                var query = ej.Query()            
                    .from("Orders")
                    .select("OrderID", "CustomerID", " EmployeeID", "Freight", "ShipCountry")
                    .range(25,30)            
                var execute = dataManager.executeQuery(query) // executing query
                        .done(function (e) {
                            $("#table1 tbody").html($("#tableTemplate").render(e.result));
                        });
            });
        </script>
        <script id="tableTemplate" type="text/x-jsrender">
            <tr>
                <td>{{>OrderID}}</td>
                <td>{{>CustomerID}}</td>
                <td>{{>EmployeeID}}</td>
                <td>{{>Freight}}</td>
                <td>{{>ShipCountry}}</td>          
            </tr>
        </script>

    Result of the above code example is illustrated as follows.