2
我需要在DropDownList的SelectedIndexChanged事件上動態添加CheckBoxList。我已經實現了這一點,但我無法保留其回寄價值。在Asp.Net中檢索動態創建控件的值
這是我迄今所做的:
protected override void OnInit(EventArgs e)
{
base.OnInit(e);
loadTracks();//Needs to generated dynamically
}
protected void Page_Load(object sender, EventArgs e)
{
if (!Page.IsPostBack)
{
loadDegrees();
}
loadTracks();
}
public void loadTracks()
{
try
{
ConfigurationDB objConfig = new ConfigurationDB();
DataSet ds = objConfig.GetTracksByDegreeID(
Convert.ToInt32(ddlDegree.SelectedValue.ToString()));
CheckBoxList CbxList = new CheckBoxList();
CbxList.ID = "Cbx";
for (int i = 0; i < ds.Tables[0].Rows.Count; i++)
{
CbxList.Items.Add(new ListItem(ds.Tables[0].Rows[i]["Track_Name"]
.ToString(), ds.Tables[0].Rows[i]["ID"].ToString()));
}
ph.Controls.Add(CbxList);
ViewState["tracks"] = true;
}
catch(Exception ex)
{
Response.Write(ex.Message);
}
}
//For testing, I added a button and on its click I have added this code
protected void btnDetails_Click(object sender, EventArgs e)
{
CheckBoxList Cbx = (CheckBoxList)ph.FindControl("chk");
foreach (ListItem ex in Cbx.Items)
{
if (ex.Selected)
{
Response.Write(String.Format("You selected: <i>{0}</i> <br>", ex.Value));
}
}
}
偉大的!它工作 – Shah 2011-12-28 13:20:10
Andomar如果我填充複選框列表cbx。我的意思是如果我不把它添加到佔位符。結果會一再重複。我做了 CbxList.Items.Clear();然後我也丟失它的ID,我需要checkboxlist的selecedIndexChange。我被卡住了。你會建議什麼 – Shah 2011-12-30 10:46:52
@ user1057735:只添加項目'if(!IsCallback &&!IsPostBack)'。隨意提出新問題,而不是添加評論;那麼所有的SO都有機會回答! – Andomar 2011-12-30 11:15:14