Show selected records in pop up to print and delete them

The purpose of this article is to show the selected IDs in pop up page for printing and removing those records from the datagrid in the parent page.

Few days back I was stuck in a problem of getting the values of selected rowIDs from DataGrid in a pop up page for printing those records.

My requirement was to print the selected records from DataGrid. And on Print Selected button I had to open a pop up page. In that page the user should be able to see the selected records in the table format. (i.e. Simple Grid without style).

For that I had made a JavaScript code to fetch the selected rows values. I stored those values in one hidden control. And then wrote the logic to bind the DataGrid for those Ids. But the problem was like this :: I was getting not getting the values of Ids in the hidden control.

To check I took a TextBox and assigned the Ids in it. At the time when the pop up was executed, I was able to see the Ids in TextBox, but when I tried to fetch them in server side code (like txtIDs.Text), I was getting blank value.

So I need to do the postback again for that purpose and then I got the values in TextBox in server side.

I am writing the Javascript code which I wrote to fetch the values in pop up page.

JavaScript Code ::

function GetIDs()
{ 
      var IDs = "";
      var LoopCounter;
      for(LoopCounter=0; LoopCounter < (window.opener.document.getElementsByName('chkBox').length); LoopCounter++)

            {
               if(window.opener.document.getElementsByName("chkBox")[LoopCounter].checked == true)
               {
                        IDs = IDs + window.opener.document.getElementsByName("chkBox")[LoopCounter].value + ",";
               }
            }

            if(IDs != "")
            { 
                  IDs = IDs.substring(0, IDs.lastIndexOf(","));
                  document.getElementById("txtID").value = IDs;
            }

         __doPostBack();
   }

In aspx page the 'chkBox' column was defined like this

<input id="chkBox" name="chkBox" type="checkbox" value="<%# DataBinder.Eval(Container.DataItem, "ID") %>">

And on server side in Page_Load event, I wrote the following code....

On first post back, I called the javascript and on second postback, I bind the DataGrid for those Ids.

Here is the Server side code for that..

protected void Page_Load(object sender, EventArgs e)
{

                  if (!IsPostBack)
                           ScriptManager.RegisterStartupScript(this, this.GetType(), "alertMsg", "javascript:GetIDs();", true); 
                  else
                  {
                        if (txtID.Text.Trim() != "")
                        {
                              BindGridData(txtID.Text.ToString().Trim()); // function to bind the Grid data.
                        }
                  }
         }

So finally, On second Postback I got the values in DataGrid and able to print the records.

Upto this it was ok. But after that I had to remove those records from the calling page, which I had selected to print.

So that I made a function which I called on onunload event of the form of Pop up page and called a javascript function of pagent page. The function is like this,

function CallParent()
{ 
         window.opener.ExecuteDeBtn();
         return false;
}

And write the following javascript function on calling (parent) page.

function ExecuteDeBtn()
{
      var objBtn = document.getElementById("btnMultiDelete"); 
      var objHid = document.getElementById("hidDeleted");

      objHid.value ="yes";
      __doPostBack(objBtn.id, null);
      return true;
}

where btnMultiDelete is the button on which client click I had opend a pop up page. So after printing the records from pop up I wanted to call its server side click event. So I wrote the code as above. As it was not executing the click event and executing only page_Load event, I had to take a hidden field for that purpose and I assined the value to hidden control.

Then on Page_Load I wrote the following code to execute the delete functionality...

protected void Page_Load(object sender, EventArgs e)
{
      if (hidDeleted.Value == "yes")
      {
               MultipleDeposit();   // function to delete records from DataGrid.
               hidDeleted.Value = ""; 
      }

      if (!IsPostBack)
      { 
            // My General coding for that page.
            BindDataGrid();
      }
}

And I got the solution for it. And done the things for my task.

I still have some doubts which I would like to ask to Mr. Robbe about the first issue of this article.