ASPxClientGridView.GetColumnCount Method

Returns the number of columns within the client GridView.

Declaration

GetColumnCount(): number

Returns

Type	Description
number	The number of columns within the client GridView.

Example

The example demonstrates how to dynamically disable editors on Edit Form, when an editor's value is changed.This approach cannot be used when edit templates are defined.

Default.aspx (C#)

<dx:ASPxGridView ID="ASPxGridView1" runat="server" AutoGenerateColumns="False" ClientInstanceName="grid" 
                 KeyFieldName="ID" OnCellEditorInitialize="ASPxGridView1_CellEditorInitialize" OnRowUpdating="ASPxGridView1_RowUpdating" Width="390px">
    <Columns>
        <dx:GridViewCommandColumn >
            <EditButton Visible="True" />
        </dx:GridViewCommandColumn>
        <dx:GridViewDataTextColumn FieldName="Name" />
        <dx:GridViewDataDateColumn FieldName="Date" />
        <dx:GridViewDataCheckColumn FieldName="Editable" >
            <PropertiesCheckEdit>
                <ClientSideEvents CheckedChanged="function(s, e) {
                                    for(i = 0; i &lt; grid.GetColumnsCount(); i++) {
                                        var editor = grid.GetEditor(i);
                                        if(editor != null &amp;&amp; editor != s)
                                            editor.SetEnabled(s.GetChecked());
                                    }
                                  }" />
            </PropertiesCheckEdit>
        </dx:GridViewDataCheckColumn>
    </Columns>
</dx:ASPxGridView>

Default.aspx.cs

protected void Page_Init(object sender, EventArgs e) {
    ASPxGridView1.DataSource = GetDataSource();
}
private DataTable GetDataSource() {
    DataTable table = new DataTable();
    table.Columns.Add("ID", typeof(int));
    table.Columns.Add("Name", typeof(string));
    table.Columns.Add("Date", typeof(DateTime));
    table.Columns.Add("Editable", typeof(bool));
    table.Rows.Add(1, "Item A", DateTime.Today, true);
    table.Rows.Add(2, "Item B", DateTime.Today.AddDays(-1), false);
    return table;
}
protected void Page_Load(object sender, EventArgs e) {
    ASPxGridView1.DataBind();
}
// value saving is halted
protected void ASPxGridView1_RowUpdating(object sender, DevExpress.Web.Data.ASPxDataUpdatingEventArgs e) {
    e.Cancel = true;
    ASPxGridView1.CancelEdit();
}
protected void ASPxGridView1_CellEditorInitialize(object sender, DevExpress.Web.ASPxGridView.ASPxGridViewEditorEventArgs e) {
    if(e.Column.FieldName != "Editable") {
        bool editable = (bool)ASPxGridView1.GetRowValues(e.);
        e.Editor.ClientEnabled = editable;
    }
}

Default.aspx.vb

Protected Sub Page_Init(ByVal sender As Object, ByVal e As EventArgs)
    ASPxGridView1.DataSource = GetDataSource()
End Sub

Private Function GetDataSource() As DataTable
    Dim table As New DataTable()
    table.Columns.Add("ID", GetType(Integer))
    table.Columns.Add("Name", GetType(String))
    table.Columns.Add("Date", GetType(DateTime))
    table.Columns.Add("Editable", GetType(Boolean))
    table.Rows.Add(1, "Item A", DateTime.Today, True)
    table.Rows.Add(2, "Item B", DateTime.Today.AddDays(-1), False)
    Return table
End Function
Protected Sub Page_Load(ByVal sender As Object, ByVal e As EventArgs)
    ASPxGridView1.DataBind()
End Sub
' value saving is halted
Protected Sub ASPxGridView1_RowUpdating(ByVal sender As Object, ByVal e As DevExpress.Web.Data.ASPxDataUpdatingEventArgs)
    e.Cancel = True
    ASPxGridView1.CancelEdit()
End Sub
Protected Sub ASPxGridView1_CellEditorInitialize(ByVal sender As Object, ByVal e As DevExpress.Web.ASPxGridView.ASPxGridViewEditorEventArgs)
    If e.Column.FieldName <> "Editable" Then
        Dim editable As Boolean = CBool(ASPxGridView1.GetRowValues(e.))
        e.Editor.ClientEnabled = editable
    End If
End Sub