Acessing dynamically generated radiobuttonlist of grid : The Official Microsoft ASP.NET Forums

Reply

rogerz123456...

Member

138 Points

122 Posts

Acessing dynamically generated radiobuttonlist of grid

Mar 22, 2011 07:10 AM|LINK

Hello All,

I have a grid and on each row of grid i generate a radiobuttonlist with 2 items dynamically in rowdatabound. On the save button event i want to access the data of the row and save the data in DB with which ever radio button is selected.

I tried different things but all in vain. I tried to use hidden field so that whenever any radio button is selected in a row then in javascript i will update the hidden field but user can select multiple rows so this is not a good solution.

Here is my code of dynamic radio button list generation in rowdatabound event.

RadioButtonList rb = new RadioButtonList();
            rb.RepeatDirection = RepeatDirection.Horizontal;

            ListItem liGood = new ListItem();
            //liGood.Attributes.Add("id", "good");
            liGood.Text = "Good";
            liGood.Attributes.Add("name", _activitySeqNo);
            liGood.Value = "G|" + _sourceSeqNo;
            //liGood.Attributes.Add("onclick","return SetHiddenField('" + hdField.ClientID + "," +  gvMain.ClientID + "');");

            ListItem liBad = new ListItem();
            //liGood.Attributes.Add("id", "bad");
            liBad.Text = "Bad";
            liBad.Attributes.Add("name", _activitySeqNo);
            liBad.Value = "B|" + _sourceSeqNo;
            //liBad.Attributes.Add("onclick", "return SetHiddenField('" + hdField.ClientID + "," + gvMain.ClientID + "');");

Any help will be greatly appreciated.

Regards,

Behroz Sikander

Blog - My Blog
Behroz Sikander

Reply

DreamBig

Participant

1339 Points

622 Posts

Re: Acessing dynamically generated radiobuttonlist of grid

Mar 22, 2011 07:47 AM|LINK

Solved here - http://forums.asp.net/p/1559513/3846467.aspx

Dream Big n Act Fast.........

My Blog

Edited by DreamBig on Mar 22, 2011 07:48 AM
Edited by DreamBig on Mar 22, 2011 07:48 AM
Edited by DreamBig on Mar 22, 2011 07:48 AM
Edited by DreamBig on Mar 22, 2011 07:48 AM
Edited by DreamBig on Mar 22, 2011 07:48 AM
Edited by DreamBig on Mar 22, 2011 07:48 AM
Edited by DreamBig on Mar 22, 2011 07:48 AM
Edited by DreamBig on Mar 22, 2011 07:49 AM
Edited by DreamBig on Mar 22, 2011 07:49 AM
Edited by DreamBig on Mar 22, 2011 07:50 AM
Edited by DreamBig on Mar 22, 2011 07:50 AM
Edited by DreamBig on Mar 22, 2011 07:50 AM
Edited by DreamBig on Mar 22, 2011 07:50 AM
Edited by DreamBig on Mar 22, 2011 07:50 AM
Edited by DreamBig on Mar 22, 2011 07:50 AM
Edited by DreamBig on Mar 22, 2011 07:50 AM

Reply

rogerz123456...

Member

138 Points

122 Posts

Re: Acessing dynamically generated radiobuttonlist of grid

Mar 22, 2011 08:41 AM|LINK

thank you for your reply. but i want to access them in the Save Button click event.

Blog - My Blog
Behroz Sikander

Reply

DreamBig

Participant

1339 Points

622 Posts

Re: Acessing dynamically generated radiobuttonlist of grid

Mar 22, 2011 09:16 AM|LINK

what you can do is create the controls as it is said in the link i.e on Row Created event & then u can access those controls in the Row Updating event & get the selected value. Here u can have the selected value in a hidden field wich would be accessible in the save button click event.

Hope this helps..

Dream Big n Act Fast.........

My Blog

Reply

hiren.sharma

Participant

1460 Points

311 Posts

Re: Acessing dynamically generated radiobuttonlist of grid

Mar 22, 2011 12:22 PM|LINK

Well if you want to access Dynamic Control on post back then it's really important that you re-create them during postback i.e.

protected void Page_Load(object sender, EventArgs e)
{
            if (Page.IsPostBack)
            {
                         // Create Radio Button list here
                        //foreach(GridViewRow in GridView.rows)
                        //{
                        //}
            }
}

This is necessary as the Dynamic Controls are not saved in Page's View State and thus they are lost on PostBack, so you need to Re-create them everytime the page posts back. You can do the same in PAGE_INIT event as well.

After that when your click event wont have any problem finding the RadioButtons and thus will be executed suxxessfully.

Hope this Helps !!!

Happy Coding

Do Mark as answer if my suggestion suits you
Try out My Blog | Visit My Website

Reply

rogerz123456...

Member

138 Points

122 Posts

Re: Acessing dynamically generated radiobuttonlist of grid

Mar 22, 2011 01:00 PM|LINK

I have to recreate just the radiolist or do i have to create all the items as well ? I think yes, i will have to. But if i recreate the items as well and fill them with the database values.(The value of items comes from the database.). Here is what i have implemented.

private void AddRadioButton()
    {
        ListItem liGood = new ListItem();
        liGood.Text = "Good";
        liGood.Value = "G";

        ListItem liBad = new ListItem();
        liBad.Text = "Bad";
        liBad.Value = "B";

        foreach (GridViewRow row in gvMain.Rows)
        {
            RadioButtonList rb = new RadioButtonList();
            rb.RepeatDirection = RepeatDirection.Horizontal;
            //rb.ID = "rb" + row.RowIndex;

            if (row.RowType == DataControlRowType.DataRow)
            {
                if (row.Cells[7].Text != "Y")
                {
                    liGood.Selected = true;
                    if (row.Cells[6].Text == "B")
                        liBad.Selected = true;
                }
                else
                {
                    liGood.Enabled = false;
                    liGood.Selected = true;

                    if (row.Cells[6].Text == "B")
                        liBad.Selected = true;
                    liBad.Enabled = false;
                }
                rb.Items.Add(liGood);
                rb.Items.Add(liBad);

                row.Cells[11].Controls.Add(rb);
            }
        }
    }

This function is called from PreLoad event of the page and PreRender event of the GRID. Now i can access the values but the comes that arises now is that if i change the selected item of the row then on the Save event i get the old values. I tried to drill down the problem and i think that my above function is not correct and i am doing something wrong there. Can you figure out any problem ??

My PreLoad is:

protected override void OnPreLoad(EventArgs e)
    {
        GetMasterPageControls();
        AddRadioButton();
        base.OnPreLoad(e);
    }

and my Grid PreRender event is :

protected void gvMain_PreRender(object sender, EventArgs e)

{

AddRadioButton();

}

Regards,

Behroz Sikander

Blog - My Blog
Behroz Sikander

Reply

Qin Dian Tan...

All-Star

113532 Points

12480 Posts

Microsoft

Re: Acessing dynamically generated radiobuttonlist of grid

Mar 24, 2011 07:53 AM|LINK

Hi,

The usual flow to do what you describe is like this:

Bind GridView in Page_Init event.
Create RadioButtonList in RowDataBound event of GridView.
Handle the button to loop the GridView to access the selected value from RadioButtonList to do saving or other process.

Thanks,

Please mark the replies as answers if they help or unmark if not.
If you have any feedback about my replies, please contactmsdnmg@microsoft.com.
Microsoft One Code Framework

Reply

hiren.sharma

Participant

1460 Points

311 Posts

Re: Acessing dynamically generated radiobuttonlist of grid

Mar 24, 2011 08:07 AM|LINK

Well in Pre_Init, you cannot access the view state or anything

If your radio button ius dependent on some value in Datatable which is kept in ViewState

den do it in protected override void OnPreLoad(EventArgs e)

dats all

Problem Solved

Do Mark as answer if my suggestion suits you
Try out My Blog | Visit My Website

Reply

rogerz123456...

Member

138 Points

122 Posts

Re: Acessing dynamically generated radiobuttonlist of grid

Mar 28, 2011 09:10 AM|LINK

Hello All,

Finally i found the solution. I am posting the solution here in case anybody is searching for the solution.

On you PreLoad you will have to regenerate your radiobuttons so that you can access then. You should not use Pre_Init event because the grid data is not loaded at the time (I found this info on the internet). Here is my PreLoad event

protected override void OnPreLoad(EventArgs e)
    {
        GetMasterPageControls();
        AddRadioButton();
        base.OnPreLoad(e);
    }

Remember one thing. If you are using MasterPage then you will have to get the controls before regenerating them. See the above event which contains a function GetMasterPageControls() function.

Here is my AddRadioButton() function:

private void AddRadioButton()
    {
        foreach (GridViewRow row in gvMain.Rows)
        {
            if (row.RowType == DataControlRowType.DataRow)
            {
                if (GetRadioButtonList(row) == null)
                {
                    row.Cells[11].Controls.Add(CreateRadioList(row)); 
                }
            }
        }
}

 row.Cells[11] <-- 11 is the index of my grid cell which contains the radiobuttonlist.

Here is my CreateRadioList() function.This function includes my own logic:

private RadioButtonList CreateRadioList(GridViewRow row)
    {   
        ListItem liGood = new ListItem();        
        liGood.Text = "Good";        
        liGood.Value = "G";

        ListItem liBad = new ListItem();        
        liBad.Text = "Bad";        
        liBad.Value = "B";
        
        RadioButtonList rb = new RadioButtonList();
        rb.RepeatDirection = RepeatDirection.Horizontal;
        rb.ID = "DynamicallyCreatedRadioList_" + row.RowIndex;

        if (checkForRadioList != 1)
        {
            //Do nothing
        }
        else
        {   
            if (row.Cells[7].Text != "Y")
            {
                liGood.Selected = true;
                if (row.Cells[6].Text == "B")
                    liBad.Selected = true;
            }
            else
            {
                liGood.Enabled = false;
                liGood.Selected = true;

                if (row.Cells[6].Text == "B")
                    liBad.Selected = true;
                liBad.Enabled = false;
            }
            
        }

        rb.Items.Add(liGood);
        rb.Items.Add(liBad);
        row.Cells[11].Controls.Add(rb);

        return rb;
    }

Here is my GetRadioButtonList function:

 private RadioButtonList GetRadioButtonList(GridViewRow row)
    {
        return row.Cells[0].FindControl("DynamicallyCreatedRadioList_" + row.RowIndex) as RadioButtonList;
    }



Below is my GridPreRender event. :
protected void gvMain_PreRender(object sender, EventArgs e)
    {
        checkForRadioList = 1;
        AddRadioButton();
        checkForRadioList = 0;
    }
<div></div>
<div>Regards,</div>
<div>Behroz Sikander</div>

</div>

Blog - My Blog
Behroz Sikander

Marked as answer by rogerz1234567 on Mar 28, 2011 09:10 AM

Reply

hiren.sharma

Participant

1460 Points

311 Posts

Re: Acessing dynamically generated radiobuttonlist of grid

Mar 28, 2011 10:11 AM|LINK

This is what i explained to you

Do Mark as answer if my suggestion suits you
Try out My Blog | Visit My Website

Acessing dynamically generated radiobuttonlist of grid RSS

9 replies

rogerz123456...

Acessing dynamically generated radiobuttonlist of grid

DreamBig

Re: Acessing dynamically generated radiobuttonlist of grid

rogerz123456...

Re: Acessing dynamically generated radiobuttonlist of grid

DreamBig

Re: Acessing dynamically generated radiobuttonlist of grid

hiren.sharma

Re: Acessing dynamically generated radiobuttonlist of grid

rogerz123456...

Re: Acessing dynamically generated radiobuttonlist of grid

Qin Dian Tan...

Re: Acessing dynamically generated radiobuttonlist of grid

hiren.sharma

Re: Acessing dynamically generated radiobuttonlist of grid

rogerz123456...

Re: Acessing dynamically generated radiobuttonlist of grid

hiren.sharma

Re: Acessing dynamically generated radiobuttonlist of grid

This site is managed for Microsoft by Neudesic, LLC. | © 2013 Microsoft. All rights reserved.

Follow Us On:

Microsoft