Cascaded list view , how to reach items in lvl1 from lv2

Marius Vasile

I have a cascaded ListView and I want to reach objects in lvl1 from lvl2

In code behind I handle the conection with:

protected void LV1_Click(object sender, EventArgs e)
{
    Button cmd = (Button)sender;
    ListViewItem ObiectivRow = (ListViewItem)cmd.NamingContainer;

    TextBox id = (TextBox)ObiectivRow.FindControl("txtOID");
    ListView LstCladire = (ListView)ObiectivRow.FindControl("LV2");

    LstCladire.DataSource = null;
    LstCladire.DataBind();

    int oid = Convert.ToInt32(id.Text);

    List prm = new List
    {
        new SqlParameter("@OID", oid)
    };

    LstCladire.DataSource = GetDataTableEvaris("SELECT DISTINCT CID,Cladire FROM tblCladire WHERE OID= @OID;", prm);
    LstCladire.DataBind();

    if (LstCladire.Visible)
    {
        LstCladire.Visible = false;
        return;
    }

    LstCladire.Visible = true;
    
    SqlParameter prmS = new SqlParameter("@OID", oid);
    hiddenObiectiv.Text = ExecuteScalar("SELECT DISTINCT Obiectiv FROM tblObiectiv WHERE OID= @OID;", prmS);
    hiddenObiectiv.Visible = true;

    hiddenCladire.Text = string.Empty;
    hiddenCota.Text = string.Empty;
    hiddenCamera.Text = string.Empty;
}

protected void LV2_Click(object sender, EventArgs e)
{
    Button cmd = (Button)sender;
    ListViewItem CladireRow = (ListViewItem)cmd.NamingContainer;

    TextBox id = (TextBox)CladireRow.FindControl("txtCID");
    ListView LstCota = (ListView)CladireRow.FindControl("LV3");

    LstCota.DataSource = null;
    LstCota.DataBind();

    int cid = Convert.ToInt32(id.Text);

    List prm = new List
    {
        new SqlParameter("@CID", cid)
    };

    //aici se incarca imaginea pentru cota

    LstCota.DataSource = GetDataTableEvaris("SELECT DISTINCT EID,Cota FROM tblCota WHERE CID = @cid;", prm);
    LstCota.DataBind();

    if (LstCota.Visible)
    {
        LstCota.Visible = false;
        return;
    }
    LstCota.Visible = true;

    SqlParameter prmS = new SqlParameter("@CID", cid);
    hiddenCladire.Text = ExecuteScalar("SELECT DISTINCT Cladire FROM tblCladire WHERE CID= @CID;", prmS);
    hiddenCladire.Visible = true;

    hiddenCota.Text = string.Empty;
    hiddenCamera.Text = string.Empty;

}

But I want to disable LstCladire which is in LVL1 from LVL2 procedure on a button click

2 Replies

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Marius Vasile1y ago

Well, The AI solution works up to a point. I used enable instead of visible but it will disable the list within in lvl2

// Find the reference to LV1
ListViewItem LV1 = (ListViewItem)CladireRow.NamingContainer.NamingContainer;

// Access the LstCladire control within LV1
ListView LstCladire = (ListView)LV1.FindControl("LV2");


TextBox id = (TextBox)CladireRow.FindControl("txtCID");
ListView LstCota = (ListView)CladireRow.FindControl("LV3");

LstCota.DataSource = null;
LstCota.DataBind();

int cid = Convert.ToInt32(id.Text);

List prm = new List
{
    new SqlParameter("@CID", cid)
};

//aici se incarca imaginea pentru cota

LstCota.DataSource = GetDataTableEvaris("SELECT DISTINCT EID,Cota FROM tblCota WHERE CID = @cid;", prm);
LstCota.DataBind();

if (LstCota.Visible)
{
    LstCota.Visible = false;
    return;
}
LstCota.Visible = true;

// Disable LstCladire
LstCladire.Enabled = false;
ListView LstCladire = (ListView)LV1.FindControl("LV2");

so LstCota is now disabled even if I add

LstCota.Enabled = true;

Sophia Carter1y ago
To disable the ListView `LstCladire` which is in `LV1` from the code handling the button click in `LV2`, you would need to establish a reference back to `LV1` and then access the `LstCladire` ListView to disable it.

Here's a suggested approach:

1. On the click event of `BTNCladire` button in `LV2`, you can traverse up the control hierarchy to find the parent `LV1` control.

2. Once you have a reference to `LV1`, you can then locate the `LstCladire` control within it and disable it.

Below is a modified version of your `LV2_Click` method:
```
protected void LV2_Click(object sender, EventArgs e)
{
    Button cmd = (Button)sender;
    ListViewItem CladireRow = (ListViewItem)cmd.NamingContainer;

    // Find the reference to LV1
    ListView LV1 = (ListView)CladireRow.NamingContainer.NamingContainer;

    // Access the LstCladire control within LV1
    ListView LstCladire = (ListView)LV1.FindControl("LV2");

    // Disable LstCladire
    LstCladire.Visible = false;

    // Continue with the rest of your logic...
}
```
By using this method, you should be able to disable the `LstCladire` ListView in the `LV1` from the click event handling logic in `LV2`. This approach ensures that you can navigate through the control hierarchy and access controls from different levels within your `ListView` structure.
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