ページに 2 つのドロップダウンリストがあります。1 つはアクティビティ用、もう 1 つはサブ アクティビティ用です。アクティビティ ドロップダウンリストが変更されると、サブ アクティビティ ドロップダウンリストの値を取得します。2 番目のドロップダウンリストに updatepanel を使用しており、トリガーは最初のドロップダウンリストに設定されています。これは、ページを最大1〜2分間アイドル状態にするまで、魔法のように機能しています。アクティビティ ドロップダウン リスト (トリガー) の値を変更すると、完全なポストバックが発生し、2 番目のドロップダウン リストの項目が入力されません。
以下は私のコードです。
Aspx
<div class="form-line">
<label>Activity</label>
<asp:DropDownList ID="ddlActivity" required="required" CssClass="chosen-select" runat="server" Width="200px" AppendDataBoundItems="true" OnSelectedIndexChanged="SelectedActivity_Changed" AutoPostBack="true" CausesValidation="false">
</asp:DropDownList>
</div>
<div class="form-line">
<label>Sub Activity</label>
<asp:UpdatePanel ID="UpdatePanel1" runat="server" UpdateMode="Conditional">
<Triggers>
<asp:AsyncPostBackTrigger ControlID="ddlActivity" EventName="SelectedIndexChanged" />
</Triggers>
<ContentTemplate>
<asp:DropDownList ID="ddlSubActivity" runat="server" Width="200px" required="required" CssClass="chosen-select" AppendDataBoundItems="true" CausesValidation="false">
</asp:DropDownList>
</ContentTemplate>
</asp:UpdatePanel>
</div>
コードビハインド
[ToolboxItemAttribute(false)]
public partial class MyEstimatesAdd : WebPart
{
static string connStr = ConfigurationManager.ConnectionStrings["myConnectionString"].ConnectionString;
ChronoLogDataContext dc = new ChronoLogDataContext(connStr);
// Uncomment the following SecurityPermission attribute only when doing Performance Profiling on a farm solution
// using the Instrumentation method, and then remove the SecurityPermission attribute when the code is ready
// for production. Because the SecurityPermission attribute bypasses the security check for callers of
// your constructor, it's not recommended for production purposes.
// [System.Security.Permissions.SecurityPermission(System.Security.Permissions.SecurityAction.Assert, UnmanagedCode = true)]
public MyEstimatesAdd()
{
}
protected override void OnInit(EventArgs e)
{
base.OnInit(e);
InitializeControl();
}
protected void Page_Load(object sender, EventArgs e)
{
if (!Page.IsPostBack)
{
if (Page.Request.QueryString["Issue_ID"] != "" && Page.Request.QueryString["Issue_ID"] != null)
{
Int64 issueid = Int64.Parse(Page.Request.QueryString["Issue_ID"]);
string sCurrentUserEmail;
SPUser cuser = SPControl.GetContextWeb(Context).CurrentUser;
sCurrentUserEmail = cuser.Email;
dc = new ChronoLogDataContext(connStr);
var resource = (from r in dc.RESOURCEs
where r.Email == sCurrentUserEmail
select r).FirstOrDefault();
ddlActivity.DataSource = (from a in dc.ACTIVITY_CATEGORies
select a).ToList();
ddlActivity.DataValueField = "Activity_Category_ID";
ddlActivity.DataTextField = "Description";
ddlActivity.DataBind();
ddlActivity.Items.Insert(0, new ListItem("", ""));
}
}
}
//RUN AGAIN PRIMARY SET
protected void btnAdd_Click(object sender, EventArgs e)
{
int hours;
if (!int.TryParse(txtHours.Text, out hours))
{
throw new SPException("Hours must be a numeric value");
}
string sCurrentUserEmail;
SPUser cuser = SPControl.GetContextWeb(Context).CurrentUser;
sCurrentUserEmail = cuser.Email;
dc = new ChronoLogDataContext(connStr);
var resource = (from r in dc.RESOURCEs
where r.Email == sCurrentUserEmail
select r).FirstOrDefault();
Int64 issueid = Int64.Parse(Page.Request.QueryString["Issue_ID"]);
decimal time = decimal.Parse(hours + "." + ddlMinutes.SelectedValue.ToString(), CultureInfo.InvariantCulture);
ESTIMATE estimate = new ESTIMATE { Activity_ID = int.Parse(ddlActivity.SelectedItem.Value), Date_Captured = DateTime.Now, Estimated_Time = time, Features = txtFeatures.Text, Issue_ID = issueid, Resource_ID = resource.Resource_ID, Sub_Activity_ID = int.Parse(ddlSubActivity.SelectedItem.Value) };
dc.ESTIMATEs.InsertOnSubmit(estimate);
dc.SubmitChanges();
Close_Save();
}
protected void Close_Save()
{
HttpContext context = HttpContext.Current;
if (HttpContext.Current.Request.QueryString["IsDlg"] != null)
{
context.Response.Write("<script type='text/javascript'>window.frameElement.commitPopup()</script>");
context.Response.Flush();
context.Response.End();
}
}
protected void SelectedActivity_Changed(object sender, EventArgs e)
{
int activityid = int.Parse(ddlActivity.SelectedItem.Value);
dc = new ChronoLogDataContext(connStr);
var subactivities = (from s in dc.ACTIVITY_SUBCATEGORies
where s.Activity_Category_ID == activityid
select s).ToList();
ddlSubActivity.Items.Clear();
ddlSubActivity.DataSource = subactivities;
ddlSubActivity.DataValueField = "Activity_SubCategory_ID";
ddlSubActivity.DataTextField = "Description";
ddlSubActivity.DataBind();
ddlSubActivity.Items.Insert(0, new ListItem("", ""));
UpdatePanel1.Update();
}
}