I'm just wondering how can I possibly get all values in a ListBox as selectedItems? Note that the viewed records came from an SQL datasource. I'll be using these values as list of email addresses for an email blast.
Any help would be much appreciated, thanks.
I'm using ASP.Net C#
if you want to select all items in a listbox control, Use This
listView1.MultiSelect = true;
foreach (ListItem item in ListBox1.Items )
{
item.Selected = true;
}
or you can do like this with LINQ :
Just pass your listview and checkstate to the function.
public void CheckAllItems(ListView lvw, bool check)
{
lvw.Items.OfType<ListViewItem>().ToList().ForEach(item => item.Checked = check);
}
Related
I have trawled the internet but I cannot find a solution to the following problem.
I have a ListBox control that gets populated with a list of values from a SQL Server database table on FormLoad.
This allows the user to select multiple values and these can be submitted into the SQL Server database column as comma-delimted values.
Problem is that I would like the user to allow the editing of these submitted values from the same ListBox control.
Therefore I would like to show the user the values that are pulled from the database as selected values in the ListBox and NOT populate the ListBox with those values as the ListBox has been populated already with set values on FormLoad.
I am trying this but its not working -
foreach (ListItem li in lst_subspeciality.Items)
{
foreach (string sqlitem in dt.Rows[0]["SubSpeciality"].ToString().Split(','))
{
if (li.Text == sqlitem.ToString())
{
li.Selected = true;
}
}
}
Any help is much appreciated.
Thanks.
I didn't test this but
List<string> myValues = dt.Rows[0]["SubSpeciality"].ToString().Split(',').ToList();
foreach (ListItem li in lst_subspeciality.Items)
{
if (myValues.Contains(li.Text))
li.Selected = true;
}
I have this piece of code:
foreach (ListItem item in lbUnassigned.Items)
{
if (item.Selected)
{
string itemName = item.Text.ToString();
string itemValue = item.Value.ToString();
lbAssigned.Items.Add(new ListItem(itemName, itemValue));
lbUnassigned.Items.Remove(lbUnassigned.SelectedItem);
}
}
Which is pretty much identical to an example given in the .NET 3.5 book I have, yet when stepping through this procedure the item.selected if false every time, even though I am selecting at least one value in the ListBox.
Any ideas what I could be doing wrong?
Usually when something like this happens the reason is control rebinding. Check if you have the if(!IsPostBack) on your page load when binding the control
I'm iterating through a collection of asp:tablerows to be able to get or set the text in a textbox that is nested in the third cell of the row; I'm doing this by type rather than by ID because the cell ID's in that column aren't totally consistent--thus I can't really call FindControl() to achieve this. I've resorted to casting the third control in the TableRow to a TableCell and then Casting the first control in that cell to a TextBox. Not quite correct, as I'm getting an index out of range exception thrown. The problem mainly lies in the Controls.Count() property of the third cell, which comes to zero.
Not sure if there's a better way to access the textbox---should I resort to FindControl()?
The code:
foreach (TableRow row in tblProviders.Rows) {
string value = ((TextBox)((TableCell)row.Controls(2)).Controls(0)).Text;
...
}
My searches here only yielded use of FindControl(), so that may be the only way...
Thanks!
You could use Linq as follows:
var TextBoxes = tblProviders.Rows.OfType<TableRow>()
.SelectMany(row => row.Cells.OfType<TableCell>()
.SelectMany(cell => cell.Controls.OfType<TextBox>()));
TextBoxes would then be a collection of all the textboxes in tblProviders.Rows, which you could then itterate through and do what you like with.
A little bit of null checking wouldn't go amiss here.
You could try using this Recursive call:
foreach (TableRow row in tblProviders.Rows) {
var tb = FindControlRecursive(row, typeof(TextBox));
if (tb != null) {
string value = ((TextBox)tb).Text;
}
}
private Control FindControlRecursive(Control rootControl, Type controlType) {
if (rootControl.GetType() == controlType)
return rootControl; //Found it
foreach (Control controlToSearch in rootControl.Controls) {
Control controlToReturn = FindControlRecursive(controlToSearch, controlType);
if (controlToReturn != null) return controlToReturn;
}
return null;
}
Using ASP.NET 3.5 ListView control.
I would like to capture the value of my table id from the currently edited row of a ListView.
A ItemEditing event has been added to the ListView.
The only value available in this event is e.NewItemIndex.
This returns 0 if the first row of the current page of the ListView is being edited.
How do I convert this 0 into the actual table id (label control value)?
I have tried:
table_id = Convert.ToString(ListView1.Items[e.NewEditIndex].FindControl("table_idLabel1"));
Can you use the DataKeyNames property instead of a label? Set the property to the name of the database field that is the key for the table, then do something like this:
table_id = ListView1.DataKeys[e.NewEditIndex].Value.ToString();
Are you sure table_idLabel1 is the correct id?
Also, you may need to look recursively as in Chris's answer. Plus, it looks like your casting the control to a string. You probably want the ID property and not the control itself.
Use FindControlRecursive (from Recursive Page.FindControl). The problem with FindControl is that it only search one layer deep.
private Control FindControlRecursive(Control root, string id)
{
if (root.ID == id)
{
return root;
}
foreach (Control c in root.Controls)
{
Control t = FindControlRecursive(c, id);
if (t != null)
{
return t;
}
}
return null;
}
Ive no problems using Javascript to read the rows of a telerik radgrid component im using however I can seem to find anyway to access the row data server side when a postback occurs. Ive spent ages looking for solution but no luck.
Any pointers would be greatly appreciated.
Tony
You might want to look at the DataKeyValues property of the OwnerTableView object, which will let you access a collection of values that represent the fields in a given row. I use it during the EditCommand event handler, since a user of my site is directed to an edit page if they click on the link to edit a row in the grid, and I need to pass along certain info about the given row in the query string.
If this turns out to be what you need, you'll also need to define which fields should be made available through this property. To do that, look at the MasterTableView.DataKeyNames property in the property sheet for the grid. You basically specify a comma-delimited list of field names.
The server-side is the easy part:
GridItemCollection gridRows = TestGrid.Items;
foreach (GridDataItem data in gridRows)
{
ItemClass obj = (ItemClass)data.DataItem;
}
It's the client side part that I don't know! :[
private Int32 GetID()
{
foreach (Telerik.Web.UI.GridDataItem dataItem in radGrid.MasterTableView.Items)
{
if (dataItem.Selected == true)
{
Int32 ID = (Int32)dataItem.GetDataKeyValue("ID");
return ID;
}
}
throw new ArgumentNullException("Id Not found");
}
This is the one that works for me and uses the RadGrid.SelectedItems collection.
protected void LinkButton1_Click(object sender, EventArgs e)
{
List<Guid> OrderIdList = new List<Guid>();
foreach (GridDataItem OrderItem in this.RadGrid1.SelectedItems)
{
OrderIdList.Add(new Guid(OrderItem.GetDataKeyValue("OrderId").ToString()));
}
}
If you correctly created your controls in markup or page init for dynamic controls, then the RadGrid will properly restore state.
You can access the initial values that were loaded from the data source like this example below, provided you told the table view in question to keep the columns around in the data keys.
protected T GetInitialGridData<T>(GridDataItem item, string uniqueColumnName) {
item.ThrowIfNull("item");
uniqueColumnName.ThrowIfNullOrEmpty("uniqueColumnName");
return (T)item.OwnerTableView.DataKeyValues(gridItem.ItemIndex)(columnName);
}
If you are using a dynamic custom template column, and need to get to any values that may now be in their states, you can use:
protected string GetCustomTextBoxValue(GridDataItem item, string controlID) {
item.ThrowIfNull("item");
controlID.ThrowIfNullOrTrimmedEmpty("controlID");
return ((TextBox)item.FindControl(controlID)).Text;
}
private Int32 GetID()
{
foreach (Telerik.Web.UI.GridDataItem dataItem in radGrid.MasterTableView.Items)
{
if (dataItem.Selected == true)
{
// Int32 ID = (Int32)dataItem.GetDataKeyValue("ID");
Int32 ID =Convert.ToInt32(dataItem.GetDataKeyValue("ID"));
return ID;
}
}
}
//this will work