启用禁用复选框的下拉列表

迪纳夫·艾哈里

我有一个dropdownlist和checkbox在RadGrid。

我Enabled="false"最初设置了下拉菜单。因此，在页面加载时，下拉列表将被禁用，现在，如果我从RadGrid选中任何复选框，则应启用下拉列表。

复选框：

<telerik:GridTemplateColumn UniqueName="CheckBoxTemplateColumn">
    <ItemTemplate>
        <asp:CheckBox ID="CheckBox1" runat="server" OnCheckedChanged="ToggleRowSelection"
            AutoPostBack="True" />
    </ItemTemplate>
    <HeaderTemplate>
        <asp:CheckBox ID="headerChkbox" runat="server" OnCheckedChanged="ToggleSelectedState"
            AutoPostBack="True" />
    </HeaderTemplate>
</telerik:GridTemplateColumn>

下拉列表：

<telerik:RadDropDownList ID="ddlAction" Enabled="false" DefaultMessage="Action" AutoPostBack="true" DataValueField="action" OnSelectedIndexChanged="ddlAction_SelectedIndexChanged"  runat="server">
   <Items>
       <telerik:DropDownListItem Text="" Value="" />
       <telerik:DropDownListItem Text="Refresh Mail Status" Value="Refresh Mail Status" />
       <telerik:DropDownListItem Text="Send All" Value="Send All" />
       <telerik:DropDownListItem Text="Send Selected" Value="Send Selected"/>
       <telerik:DropDownListItem Text="Remove" Value="Remove" />
   </Items>
</telerik:RadDropDownList>

后面的代码：

protected void ddlAction_SelectedIndexChanged(object sender, DropDownListEventArgs e)
{
    CheckBox chk = (CheckBox)sender;
    chk.FindControl("CheckBox1");

    if (!chk.Checked) {
        ddlAction.Enabled = true;
    }
}

ToggleRowSelection

protected void ToggleRowSelection(object sender, EventArgs e)
        {
            ((sender as CheckBox).NamingContainer as GridItem).Selected = (sender as CheckBox).Checked;
            bool checkHeader = true;
            foreach (GridDataItem dataItem in radgridCCBList.MasterTableView.Items)
            {
                if (!(dataItem.FindControl("CheckBox1") as CheckBox).Checked)
                {
                    checkHeader = false;
                    break;
                }
            }
            GridHeaderItem headerItem = radgridCCBList.MasterTableView.GetItems(GridItemType.Header)[0] as GridHeaderItem;
            (headerItem.FindControl("headerChkbox") as CheckBox).Checked = checkHeader;

        }

ToggleSelectedState

protected void ToggleSelectedState(object sender, EventArgs e)
        {
            CheckBox headerCheckBox = (sender as CheckBox);
            foreach (GridDataItem dataItem in radgridCCBList.MasterTableView.Items)
            {
                (dataItem.FindControl("CheckBox1") as CheckBox).Checked = headerCheckBox.Checked;
                dataItem.Selected = headerCheckBox.Checked;
            }
        }

在这里ToggleRowSelection和ToggleSelectedState方法是，当我选中特定行的复选框时，选择该行。

杰耶什·戈亚尼（Jayesh Goyani）

请尝试使用以下代码段。

方法1：

protected void Page_Load(object sender, EventArgs e)
{
    if (!IsPostBack)
    {
        ddlAction.Enabled = false;
    }
}

protected void ToggleRowSelection(object sender, EventArgs e)
{
    ValidateCheckbox();
}

protected void ValidateCheckbox()
{
    bool IsEnabled = false;

    foreach (GridDataItem item in RadGrid1.MasterTableView.Items)
    {
        CheckBox CheckBox1 = item["CheckBoxTemplateColumn"].FindControl("CheckBox1") as CheckBox;
        if (CheckBox1.Checked)
        {
            IsEnabled = true;
            break;
        }
    }

    ddlAction.Enabled = IsEnabled;
}

方法2：

protected void Page_Load(object sender, EventArgs e)
{
    if (!IsPostBack)
    {
        ddlAction.Enabled = false;
    }
}


protected void Page_PreRender(object sender, EventArgs e)
{
    ValidateCheckbox(); 
}

protected void ValidateCheckbox()
{
    bool IsEnabled = false;

    foreach (GridDataItem item in RadGrid1.MasterTableView.Items)
    {
        CheckBox CheckBox1 = item["CheckBoxTemplateColumn"].FindControl("CheckBox1") as CheckBox;
        if (CheckBox1.Checked)
        {
            IsEnabled = true;
            break;
        }
    }

    ddlAction.Enabled = IsEnabled;
}

更新1：

protected void ValidateCheckbox()
{
    bool IsEnabled = false;

    foreach (GridDataItem item in RadGrid1.MasterTableView.Items)
    {
        CheckBox CheckBox1 = item["CheckBoxTemplateColumn"].FindControl("CheckBox1") as CheckBox;
        if (CheckBox1.Checked)
        {
            IsEnabled = true;
            break;
        }
    }

    GridHeaderItem headerItem = radgridCCBList.MasterTableView.GetItems(GridItemType.Header)[0] as GridHeaderItem;
    if ((headerItem.FindControl("headerChkbox") as CheckBox).Checked)
    {
        IsEnabled = true;
    }

    ddlAction.Enabled = IsEnabled;
}

更新2 ：（仅禁用RadDropDownList中的项目）

ASPX

<telerik:RadDropDownList ID="ddlAction" DefaultMessage="Action" AutoPostBack="true" DataValueField="action" runat="server">
    <Items>
        <telerik:DropDownListItem Text="" Value="" />
        <telerik:DropDownListItem Text="Refresh Mail Status" Value="Refresh Mail Status" />
        <telerik:DropDownListItem Text="Send All" Value="Send All" />
        <telerik:DropDownListItem Text="Send Selected" Value="Send Selected" />
        <telerik:DropDownListItem Text="Remove" Value="Remove" />
    </Items>
</telerik:RadDropDownList>

ASPX.CS

protected void Page_Load(object sender, EventArgs e)
{
    // To disable "Send All" option in DropDown
    DisableItemInDropDown("Send All");

    // To disable "Remove" option in DropDown
    DisableItemInDropDown("Remove");
}

protected void DisableItemInDropDown(string ddlItemValueText)
{
    foreach (DropDownListItem item in ddlAction.Items)
    {
        if (item.Value == ddlItemValueText)
        {
            item.Enabled = false;
        }
    }
}

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