Access RadGrid Row and Column on Client Side

Get Client Data key on Client

<telerik:radcodeblock id="RadCodeBlock1" runat="server">
        <script type="text/javascript">
            function AccessOnclient() {
                var grid = $find("<%= RadGrid1.ClientID %>");
                if (grid) {
                    var MasterTable = grid.get_masterTableView();
                    var Rows = MasterTable.get_dataItems();
                    for (var i = 0; i < Rows.length; i++) {
                        var row = Rows[i];
                        var ClientDataKey_ID = row.getDataKeyValue("ID");
                    }
                }
                return false;
            }
        </script>
    </telerik:radcodeblock>

Get Template Column Control

<telerik:radcodeblock id="RadCodeBlock1" runat="server">
        <script type="text/javascript">
            function AccessOnclient() {
                var grid = $find("<%= RadGrid1.ClientID %>");
                if (grid) {
                    var MasterTable = grid.get_masterTableView();
                    var Rows = MasterTable.get_dataItems();
                    for (var i = 0; i < Rows.length; i++) {
                        var row = Rows[i];
                        // Method1
                        var lblName_1 = $(row.get_element()).find("span[id*='lblName']").get(0);
                        // Method2
                        var lblName_2 = $telerik.findControl(row.get_element(), "lblName");
                        // Method3
                        var lblName_3 = row.findControl("lblName");
                    }
                }
                return false;
            }
        </script>
    </telerik:radcodeblock>

Access Column Text

<telerik:radcodeblock id="RadCodeBlock1" runat="server">
        <script type="text/javascript">
            function AccessOnclient() {
                var grid = $find("<%= RadGrid1.ClientID %>");
                if (grid) {
                    var MasterTable = grid.get_masterTableView();
                    var Rows = MasterTable.get_dataItems();
                    for (var i = 0; i < Rows.length; i++) {
                        var row = Rows[i];
                        // Method1
                        var getCellText_1 = row.get_element().cells[0].innerHTML;
                        // Method2
                        var getCellText_2 = row.get_cell("ID").innerHTML;
                        // Method3
                        var getCellText_2 = row.get_cell("Name").getElementsByTagName("span")[0].innerHTML; //this code also work for Checkboxcolunm, hyperlinkcolumn...etc
                    }
                }
                return false;
            }
        </script>
    </telerik:radcodeblock>

Access Column's property here

<telerik:radcodeblock id="RadCodeBlock1" runat="server">
        <script type="text/javascript">
            function AccessOnclient() {
                var grid = $find("<%= RadGrid1.ClientID %>");
                if (grid) {
                    var MasterTable = grid.get_masterTableView();
                    var Columns = MasterTable.get_columns();
                    for (var i = 0; i < Columns.length; i++) {
                        var column = Columns[0];
                        var columnUniqueName = column.get_uniqueName();
                        var columnDataField = column.get_dataField();
                        var columnfilterFunction = column.get_filterFunction();
                    }
                }
                return false;
            }
        </script>
    </telerik:radcodeblock>

Access Control in Edit mode

<telerik:radcodeblock id="RadCodeBlock1" runat="server">
        <script type="text/javascript">
            function AccessOnclient() {
                var grid = $find("<%= RadGrid1.ClientID %>");
                if (grid) {
                    var EditItems = grid.get_editItems();
                    for (var i = 0; i < EditItems.length; i++) {
                        var editItem = EditItems[0];
                        var checkbox1 = $(editItem.get_editFormItem()).find("input[id*='CheckBox1']").get(0)
                    }

                }
                return false;
            }
        </script>
    </telerik:radcodeblock>

Access Control in insert mode

<telerik:radcodeblock id="RadCodeBlock1" runat="server">
    <script type="text/javascript">
        function AccessOnclient() { 
            var grid = $find("<%= RadGrid1.ClientID %>");
            if (grid) {
                var MasterTable = grid.get_masterTableView();
                var insertRow = MasterTable.get_insertItem();
                var checkbox1 = $(insertRow).find("input[id*='CheckBox1']").get(0);
                //You can access other controls from below container
                //$(insertRow)
            }
            return false;
        }
    </script>
</telerik:radcodeblock>

ASPX

<telerik:radscriptmanager id="RadScriptManager1" runat="server">
        </telerik:radscriptmanager>
        <telerik:radajaxmanager id="RadAjaxManager1" runat="server">
        </telerik:radajaxmanager>
        <telerik:radajaxloadingpanel id="RadAjaxLoadingPanel1" runat="server">
        </telerik:radajaxloadingpanel>
        <asp:button id="Button1" onclientclick="return AccessOnclient();" runat="server" text="Access On Client"></asp:button>
       
        <telerik:radgrid allowfilteringbycolumn="true" autogeneratecolumns="false" id="RadGrid1" onneeddatasource="RadGrid1_NeedDataSource" runat="server">
            <mastertableview clientdatakeynames="ID" commanditemdisplay="Top">
                <columns>
                    <telerik:gridboundcolumn datafield="ID" headertext="ID" uniquename="ID">
                    </telerik:gridboundcolumn>
                    <telerik:gridtemplatecolumn headertext="Name" uniquename="Name">
                        <itemtemplate>
                            <asp:label id="lblName" runat="server" text="&lt;%# Eval(&quot;Name&quot;) %&gt;"></asp:label>
                        </itemtemplate>
                        <edititemtemplate>
                            <asp:checkbox id="CheckBox1" runat="server">
                        </asp:checkbox></edititemtemplate>
                    </telerik:gridtemplatecolumn>
                    <telerik:grideditcommandcolumn uniquename="EditColumn">
                    </telerik:grideditcommandcolumn>
                </columns>
            </mastertableview>
        </telerik:radgrid>

ASPX.CS

 protected void RadGrid1_NeedDataSource(object sender, Telerik.Web.UI.GridNeedDataSourceEventArgs e)
        {
            dynamic data = new[] {
               new { ID = 1, Name ="Name_1"},
               new { ID = 2, Name = "Name_2"},
               new { ID = 3, Name = "Name_3"},
               new { ID = 4, Name = "Name_4"},
               new { ID = 5, Name = "Name_5"}
           };
            RadGrid1.DataSource = data;
        }

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Access Another control which was in same level or in row

 function YourFunctionName(sender, args) {
                // Do not forget to add jquery in reference
                var SenderId = sender.id;
                //var SenderId = sender.get_element().id;
                //var SenderId =  sender.get_id();
                var RadTextBox1 = $("#" + SenderId).get(0);
                var RadTextBox2 = $("#" + SenderId.replace("RadTextBox1", "RadTextBox2")).get(0);
               // for telerik /radcontrols
                var RadTextBox2 = $telerik.findTextBox(SenderId.replace("RadTextBox1", "RadTextBox2"));

            }