Forms Data Controls :: Property Of Custom Control In Repeater Is Null On Postback?
Jan 12, 2011
A common problem in repeater controls where you want to display data for update (like a list of user phone numbers that can be updated and submitted back to the database) is where to store the database unique row identifier. So, I created a custom Textbox control that I've added a Data property to. I populate this data property with the unique row id. The problem is that when I post back the list and go through the repeater items the control's data property is null. The custom control looks like this:
[Code]....
The tag in the repeater looks like this:
[Code]....
I have a custom checkbox with the same data property and it works fine. I actually put in the same repeater with the textbox control and the checkbox control have the row id on postback but the textbox did not. Is there some limitation on the textbox control that might be causing this.
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Mar 24, 2010
I am using: .NET 2.0, VS2005
I customized a button from System.Web.UI.WebControls.Button (it is a Custom Control, NOT an User Control, no ascx file)the intention is to adding a OrderID property to the button, that can be bound to a datasource field.
Here is how this control is used in a aspx page:
[Code]....
Here is my definition of the MYButton class, it saved in a .vb file and placed in App_Code folder
[Code]....
Here is the code trying to use the OrderID in btnSave_Click()
[Code]....
The problem is OrderID is always returned as 0.
When first time page is loaded, and gridview is bind to a data source, I step through the code, and the OrderID property are set correctly, but after the postback caused by the button, the OrderID value has lost.
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Mar 17, 2011
I have a checkbox in a repeater control. How to get the User,Administrator,Security Admin as the checkbox Names ?
private string[] AvailableRoles = { "User", "Administrator", "Security Admin" };
Repeater_Roles.DataSource = AvailableRoles; Repeater_Roles.DataBind();
[code]....
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Feb 4, 2011
i am working with repeater control and in repeater there is one image tool.
so how to use property of that image control in page load event......??
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Sep 3, 2010
Iam developing a custom checkbox control deriving from the 'compositecontrol' which i need to use it for a composite control purpose.
public
class
TngCheckBox :
CompositeControl
{
i have written the required properties which are working fine except the "checked" property. here is my code for 'checked' property. i tried both the below ways (commented one and not commneted) . the problem is the 'checked' value is not setting the value at the get set part of the property.its assigning the value at the design time , but when i check and uncheck its not updating the property value.which is resulting me wrong .
[Code]....
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Oct 15, 2010
Iam developing a custom checkbox control deriving from the 'compositecontrol' which i need to use it for a composite control purpose.
public
class
TngCheckBox :
CompositeControl
{
i have written the required properties which are working fine except the "checked" property. here is my code for 'checked' property. i tried both the below ways (commented one and not commneted) . the problem is the 'checked' value is not setting the value at the get set part of the property.its assigning the value at the design time , but when i check and uncheck its not updating the property value.which is resulting me wrong .
[Code]....
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Mar 15, 2010
I have a custom control, inherited from Button. This is the class definition for the control and 2 properties:
[Code]....
I show you 2 properties, only to illustrate the problem.
as you see Aplicacion property is of a custom type Sistema, and Roles property is of type List<UserRol>.
The Aplicacion property is rendered well, this way:
[Code]....
The problem I have is with List<UserRol>. I couldn't get it to be rendered. I expeect to be rendered this way:
[Code]....
Finally, this is the TypeConverter and Editor definitions for the list:
[Code]....
The UserRol class is a typical class, without any special attributes.
I have discovered that when I use the custom editor for Roles property, the collection is not persisted. When I use the default editor for the collection, the collection is persisted.
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Nov 26, 2010
I need to create one custom text box control which should be bind with data base.
I am referring following link...
http://msdn.microsoft.com/en-us/library/system.web.ui.webcontrols.databoundcontrol.aspx
I used DataBoundControl to create my control but i am not able to do it properly.
public class SimpleTextBoxControl : DataBoundControl
{
private TextBox nameTextBox;
public string DataTextField
{
get
{
object o = ViewState["DataTextField"];
return ((o == null) ? string.Empty : (string)o);
}
set
{
ViewState["DataTextField"] = value;
}
}
[
Bindable(true),
Category("Data"),
DefaultValue(""),
Description("The text to display on the link."),
Localizable(true),
PersistenceMode(PersistenceMode.InnerDefaultProperty)
]
public virtual string DataTexValue
{
get
{
string s = (string)ViewState["Text"];
return (s == null) ? String.Empty : s;
}
set
{
ViewState["Text"] = value;
}
}
protected override void PerformDataBinding(IEnumerable retrievedData)
{
if (retrievedData == null)
return;
base.PerformDataBinding(retrievedData);
Controls.Clear();
nameTextBox = new TextBox { ID = "nameTextBox" };
foreach (object dataItem in retrievedData)
{
if (DataTextField.Length > 0)
{
nameTextBox.Text = DataBinder.GetPropertyValue(dataItem, DataTextField, null);
}
DataTexValue = nameTextBox.Text;
}
this.Controls.Add(nameTextBox);
}
}
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Feb 25, 2011
I have created a really simple custom control to render panels into a page. The code is below. When I use my control and add any webcontrol to it, after each page postback the contents of these child controls vanishes.
I must have missed something really simple but run the example to reproduce this. Can anyone please enlighten me as to why the controls are being 'emptied' of their contents, and how I stop this occuring?
Here is the code for the control
[Code]....
And here's how I am using it in a sample page:
[Code]....
[Code]....
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Jan 18, 2011
I am using repeater for binding data from the database
in repeater i put one textbox.
first time when page load event occured at that time value of textbox is null but when second time textbox takes previously assign values..
so how to assign null to the textbox.
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Jan 10, 2010
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[Code]....
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Mar 20, 2010
I use FormView with ObjectDataSource and class. I have a TextBox binded to a DateTime? property. When TextBox.Text property is empty i want to set the property of my class to null but the value is 1.1.1 00:00:00. My Workaround:
[Code]....
Is there a way to set this property to null without this workaround? Is this a bug in DataSource or is this a feature by design?
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Apr 9, 2010
I have a database field called ImageLocation, I have the ImageUrl property bound to: Eval("ImageLocation", "{0}")I would like to bind the Visble property to false if the ImageLocation is null data. I can not figure out how to set the control properly, currently the Datalist shows me all the data and when the image location is null it shows me the name of the Hyperlink control which happens to be Hyperlink2.
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Jun 17, 2010
I want to bind parent repeater item index in child repeater control using inline code not code behind side.
For example
[Code]....
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Oct 18, 2010
I created an Extender which has a custom property that drills down a list XML elements from an xml file, where users can select xml elements during design-time. This works perfectly fine. However, my code only has a hardcoded xml filename (source of the xml elements list) and I need to change this by maxing the xml file user-specified.
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Nov 28, 2010
i use div and repeater to show categories for searching part. there is a div. when iclick it, repeater opens and if i select a category its name shows on div. this part is ok. Now i do searcing. so i have to take the span's value(or repeater's value).
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Sep 13, 2010
How would I add a (dropdown) list of available values for a custom server control property?
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May 10, 2010
In asp I want to add row to my gridview when I read barcode. But when I want to add second row , gridview.datasource = null. So, my first row is removed from gridview in TxtBxBarcode_TextChanged event.
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Jan 25, 2011
I have some problem using one repeater in another repeater. There are two repeaters on the page, second one is declared in ItemTemplate of first one. DataSource of first one is DataSet with two different tables and relation between them. On DataBind event sorce data correctly displayed on page. Second DataBinder appears to be one of fields in firsone, like list of items.
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[Code]....
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Jul 19, 2010
I have a repeater which contains a hidden link button that fires when I click a row in my repeater.
Here is the markup for my repeater:
<div id="divResults" style="height: 290px; overflow-y: auto;">
<asp:Label ID="lblNote" runat="server" Text="Note: select a row to edit."></asp:Label> [code]...
Here is the javascript thats added to each row in the rptLocations_ItemDataBound:
Row.Attributes.Add("onclick",
"javascript:__doPostBack('ctl00$mainContent$rptLocations$ctl0" + (e.Item.ItemIndex + 1).ToString() +
"$lbtn_SelectRow','')");
When I click the repeater row it fires the SetLocationControls method. As you can see my repeater is wrapped in a DIV of height 290px. When the are more than 9 rows in my repeater you have to scroll the div down to view this row. When I click this row it does the postback but doesn't fire the SetLocationControls method. I've had a look in the source it's created the click event to the repeater row like all the other rows. why this method isn't firing on the rows that aren't initially visible in my DIV?
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Sep 29, 2010
I have an object to hold some specific state information in my web application - I pass it back & forward between pages by making it a property of a basepage which works fine, but I lose it on postback.
Is there any way to persist this property without manually adding & reading it again from viewstate?
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Jan 12, 2011
I've been looking around and trying a lot of different tactics to solve this issue but basically the senario is this.I have a gridview with a fileUpload in it.I can upload a file perfectly and it writes to the database.The trouble starts when I update a different cell and don't touch the cell with the fileUpload in it,it'll postback a null value to the database.
How can I keep the fileUpload control from sending a null on postback to the database so it won't clear out my entry if there isn't a new one to replace it?Or alternatively,how to I default the value to the old value on postback if nothing was entered through the FileUPload control?
[Code]...
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Dec 19, 2010
i have a page for search.and there is abutton when user click on it.result get in dataset.
[Code]....
i have repeater in itemtemplate of repeater i put table and there is lable that i want show hotelname on it.but it has error.my code is:
[Code]....
the error is:DataBinding: 'System.Char' does not contain a property with the name 'hotelname'.
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Jul 14, 2010
i have created a new user control who contains a gridview so, my prolem now is that i want show all the property of the gridview included in the control, but i want not write like this:"Usercontrol1.GridView1.Datasource=...." but i want write "Usercontrol1.DataSource=..." and this also for other controls how can i do this?
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