2
我需要在DropDownList的SelectedIndexChanged事件上动态添加CheckBoxList。我已经实现了这一点,但我无法保留其回寄价值。在Asp.Net中检索动态创建控件的值
这是我迄今所做的:
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));
}
}
}
伟大的!它工作 – Shah 2011-12-28 13:20:10
Andomar如果我填充复选框列表cbx。我的意思是如果我不把它添加到占位符。结果会一再重复。我做了 CbxList.Items.Clear();然后我也丢失它的ID,我需要checkboxlist的selecedIndexChange。我被卡住了。你会建议什么 – Shah 2011-12-30 10:46:52
@ user1057735:只添加项目'if(!IsCallback &&!IsPostBack)'。随意提出新问题,而不是添加评论;那么所有的SO都有机会回答! – Andomar 2011-12-30 11:15:14