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How to Pass Value from Ajax Enabled Base User Control to Client User Control and to the Parent ASPX Page
How to pass value from Ajax Enabled Base User Control to Client User Control and to the Parent aspx page
Introduction
What this project is all about is building an Ajax enabled dialog type Base User Control. When the button is clicked, it pops up a GridView
Popup User Control, from where the user selects some values and the selected values are sent back to the Client page and then to the Parent ASPX page. Data can be sent in the form of DataSet
to the client page and from client page to the Parent page.
Background
Please read how to pass a value between user controls:
Using the Code
- Setup - create a Base user Control like this.
- Create a Client User control page drag and drop base control on to the client user control page. Client page can inherit the Base user control Client user control: Base user control
//Base Control Codes //Define the Delegate and Event public delegate void Ep_UserControlCommandEventHandler (object sender, AB_UserControlCommandEventArgs e); public event AB_UserControlCommandEventHandler AjaxGridSelectedData; //User can set the DataSet from the Client User Control user can //pass a data for the GridView of the Base control from Client User control; //Define the DataSet property on base control private DataSet data; public DataSet Parent_DataSet { set { data = value; ; } } //When user clicks on the show dialog button. This is base control event protected void Show_Click(object sender, EventArgs e) { GridView1.DataSource = data; GridView1.DataBind(); BPanel.Update(); mdlPopup.Show(); } //Define the virtual method this method needs to implement //in the client page to access the return data set value protected virtual void OnAB_AjaxGridSelectedData(AB_UserControlCommandEventArgs e) { if (AjaxGridSelectedData != null) AjaxGridSelectedData(this, e); } //Pass the Selected values to the Client Page by Base Command event AB_UserControlCommandEventArgs(N_data));
- After selecting the values from the control, the user can press the add button to return the selected values as dataset.
protected void btnadd_Click(object sender, EventArgs e) { DataTable dt = new DataTable(); dt.Columns.Add(new DataColumn("Id", typeof(string))); dt.Columns.Add(new DataColumn("Name", typeof(string))); dt.Columns.Add(new DataColumn("Is_Selected", typeof(Boolean))); ArrayList Id_List = (ArrayList)Session["CHECKED_ITEMS"]; foreach (GridViewRow Ro in GridView1.Rows) { bool isChecked = ((CheckBox)Ro.FindControl("Is_Selected")).Checked; if (isChecked) { if (Id_List != null) { Id_List.Add(Ro.Cells[0].Text); } else { DataRow dra = dt.NewRow(); dra["Id"] = Ro.Cells[0].Text; dra["Name"] = Ro.Cells[1].Text; dra["Is_Selected"] = true; dt.Rows.Add(dra); } } } if(Id_List!=null) { string Id_s ="'"; for (int i = 0; i < Id_List.Count; i++) { Id_s += Id_List[i].ToString() +"','"; } DataTable MyTable = data.Tables[0]; DataRow[] test; string Slect = "Id in (" + Id_s + ")"; Slect=Slect.Replace(",')", ")"); test = MyTable.Select(Slect); foreach (DataRow rw in test) { DataRow dr = dt.NewRow(); dr["Id"]=rw["Id"]; dr["Name"]=rw["Name"]; dr["Is_Selected"]=true; dt.Rows.Add(dr); } } DataSet N_data = new DataSet(); N_data.Tables.Add(dt); OnEp_AjaxGridSelectedData(new AB_UserControlCommandEventArgs(N_data)); mdlPopup.Hide(); } //Client User control page implements the base control event protected void Page_Load(object sender, EventArgs e) { AjaxGridViewBaseControl1.Parent_DataSet = Main_GridData(); AjaxGridViewBaseControl1.AjaxGridSelectedData += new AB_UserControlCommandEventHandler(OnAjaxGridSelectedData); } //Get value from Base private void OnAjaxGridSelectedData(object sender, AB_UserControlCommandEventArgs e) { //The selected values can be displayed in client control //and even return back to parent page GridView1.DataSource = e.EpDataSet; GridView1.DataBind(); }
- Drag and drop the client page on the parent page.
- This is an example of how the data is displayed in the POPup Grid
History
- 13th March, 2008: Initial post