ASPxDataViewBase.ClientInstanceName Property
Gets or sets the control’s client programmatic identifier.
Namespace: DevExpress.Web
Assembly: DevExpress.Web.v18.2.dll
Declaration
Property Value
| Type | Default | Description |
|---|---|---|
| String | String.Empty | A string value that specifies the control’s client identifier. |
Remarks
Use the ClientInstanceName property to specify a unique client-side identifier for a control derived from the ASPxDataViewBase. The ClientInstanceName property’s value can be used on the client side to programmatically access the client object rendered for the control in client-side script. This property is particularly important in referencing the data view control when it is contained within a naming container (for example, within an ASPxPageControl‘s page or an ASPxPopupControl‘s window).
If the ClientInstanceName property is not specified for a control, the control’s client identifier is generated automatically, and equals the value of the control’s ID property. Note that in this case, client-side programmatic access to the control is not allowed when the control is contained within a naming container.
Example
This example demonstrates how data displayed by the ASPxDataView control can be filtered on custom callbacks initiated by a call to the PerfromCallback client method.
<%@ Page Language="C#" AutoEventWireup="true" CodeFile="Default.aspx.cs" Inherits="_Default" %>
<%@ Register Assembly="DevExpress.Web.v8.3, Version=8.3.2.0, Culture=neutral,
PublicKeyToken=b88d1754d700e49a"
Namespace="DevExpress.Web.ASPxDataView" TagPrefix="dxdv" %>
<%@ Register Assembly="DevExpress.Web.v8.3" Namespace="DevExpress.Web.ASPxEditors"
TagPrefix="dxe" %>
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN"
"http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<script runat="server">
protected void Page_Load(object sender, EventArgs e) {
if(!IsPostBack) { // start value
cbCountry.DataBind();
cbCountry.Value = 254; // USA for example
}
PrepareFilter();
}
protected void PrepareFilter() {
dvAccessDataSource.SelectParameters[0].DefaultValue = cbCountry.Value.ToString();
dvCity.DataBind();
}
</script>
<html xmlns="http://www.w3.org/1999/xhtml" >
<head runat="server">
<title>Filtering data within the ASPxDataView using custom callbacks</title>
</head>
<body>
<form id="form1" runat="server">
<table cellpadding="0" cellspacing="0">
ComboBox
<tr>
<td align="right" style="white-space: nowrap;">
<table cellpadding="0" cellspacing="0"><tr>
<td valign="middle">
<dxe:ASPxLabel ID="lblFilter" runat="server"
Text="Filter: " AssociatedControlID="cbCountry">
</dxe:ASPxLabel>
</td>
<td valign="middle">
<dxe:ASPxComboBox ID="cbCountry" runat="server"
DataSourceID="cbAccessDataSource"
TextField="Country" ValueField="CountryId"
ValueType="System.Int32" EnableIncrementalFiltering="True">
<ClientSideEvents SelectedIndexChanged="function(s, e) {
dvCity.PerformCallback();
}" />
</dxe:ASPxComboBox>
</td>
</tr></table>
</td>
</tr>
<tr><td style="height: 5px;"></td></tr> DataView
<tr>
<td>
<dxdv:ASPxDataView ID="dvCity" runat="server"
DataSourceID="dvAccessDataSource"
ClientInstanceName="dvCity" Width="580px" AllowPaging="False">
<ItemStyle Height="60px" Width="150px" />
<ItemTemplate>
<table cellpadding="0" cellspacing="0">
<tr>
<th>CountryId:</th>
<td rowspan="3"><div style="width: 5px;"></div></td>
<td><asp:Label ID="CountryIdLabel" runat="server"
Text='<%# Eval("CountryId") %>'>
</asp:Label></td>
</tr>
<tr>
<th>CityId:</th>
<td><asp:Label ID="CityIdLabel" runat="server"
Text='<%# Eval("CityId") %>'></asp:Label></td>
</tr>
<tr>
<th>City:</th>
<td><asp:Label ID="CityLabel" runat="server"
Text='<%# Eval("City") %>'>
</asp:Label></td>
</tr>
</table>
</ItemTemplate>
<Border BorderColor="#A0A0A0" BorderStyle="Solid" BorderWidth="1px" />
<Paddings Padding="5px" />
</dxdv:ASPxDataView>
</td>
</tr> </table>
<asp:AccessDataSource ID="cbAccessDataSource" runat="server"
DataFile="~/App_Data/EditorsSampleDB.mdb"
SelectCommand="SELECT * FROM [Countries]">
</asp:AccessDataSource>
<asp:AccessDataSource ID="dvAccessDataSource" runat="server"
DataFile="~/App_Data/EditorsSampleDB.mdb"
SelectCommand="SELECT * FROM [Cities] WHERE ([CountryId] = ?)">
<SelectParameters>
<asp:Parameter DefaultValue="1" Name="CountryId" Type="Int32" />
</SelectParameters>
</asp:AccessDataSource> </form>
</body>
</html>