Web Forms :: Using FindControl To Find Control Within A Table Cell?
Apr 20, 2010
Object reference not set to an instance of an object. when I try to access these dynamically created controls using FindControl.
I have a dynamically created control within a table cell. The table itself is contained within a page that has a master page. I've tried so many different ways to access this control.
Below is the latest iteration
AttrTable is the asp table, and row.Attr_Type is the name I've given to the control (it iterates through a datatable to set the names for the control)
tmpVal = CType(AttrTable.FindControl("TD_" & row.Attr_Type).FindControl(row.Attr_Type), DropDownList).Text
Below are various ways I've tried to access the control:
Dim form As Control = Page.Master.FindControl("form1")
Dim content1 = form.FindControl("ContentPlaceHolder1")
[Code]....
View 3 Replies
Similar Messages:
Feb 27, 2010
I have an asp:table control that I construct dynamically. I place a few textboxes in it within a for loop and assign their IDs in code. I'll include an abbreviated code fragment showing how I'm doing this:
[Code]....
The page then displays correctly and the ID is set correctly when I view the source, but when I try to access the textbox later when the form is submitted the call to FindControl(idStr) returns null no matter what I do.
View 4 Replies
Feb 3, 2011
I got problem finding the Control ID in my ASP.NET page.
When I try to refer that ID, it always give me:
I am trying to refer this:
[Code]....
I pass this id from here:
[Code]....
This is my code behind which is driving me crazy :(
[Code]....
When I use label to display the STRING INTIME, IT GIVES ME "textboxCashier1In"
BUT WHEN I DO THIS:
[Code]....
View 11 Replies
Feb 22, 2011
This has been driving me crazy for a while! I have a table with each cell having an id such as cell1, cell2, cell3, etc.
I am trying to assign data to cells through a loop so i have something like this
[Code]....
The problem is that after asp.net assigns a ClientID to the cells I am no longer able to find them because they get names like ct100_gameContent_cell1. Does anyone know how I can solve this problem??
View 1 Replies
Apr 1, 2010
I add a select control to a ASPX page like below:
hgc = new HtmlGenericControl();
hgc.InnerHtml = @"<select runat='server' id='my_selectlist'>
<option value='volvo'>Volvo</option>
<option value='saab'>Saab</option>
<option value='mercedes'>Mercedes</option>
<option value='audi'>Audi</option>
</select>";
Then in a Button click event, I use the code below, try to get the value selected
HtmlSelect s = (HtmlSelect)hgc.FindControl("my_selectlist");
label.Text = s.Value;
I get a error:"Object reference not set to an instance of an object."Does anyone try it before?
View 3 Replies
Jun 10, 2010
I have a PlaceHolder control inside of a ListView that I am using to render controls from my code behind. The code below adds the controls:
TextBox tb = new TextBox();
tb.Text = quest.Value;
tb.ID = quest.ShortName.Replace(" ", "");
((PlaceHolder)e.Item.FindControl("ph_QuestionInput")).Controls.Add(tb);
I am using the following code to retrieve the values that have been entered into the TextBox:
foreach (ListViewDataItem di in lv_Questions.Items)
{
int QuestionId = Convert.ToInt32(((HiddenField)di.FindControl("hf_QuestionId")).Value);
Question quest = dc.Questions.Single(q => q.QuestionId == QuestionId);
TextBox tb = ((TextBox)di.FindControl(quest.ShortName.Replace(" ","")));
//tb is always null!
}
But it never finds the control. I've looked at the source code for the page and the control i want has the id:
ctl00_cphContentMiddle_lv_Questions_ctrl0_Numberofacres
For some reason when I look at the controls in the ListViewDataItem it has the ClientID:
ctl00_cphContentMiddle_lv_Questions_ctrl0_ctl00
Why would it be changing Numberofacres to ctl00? Is there any way to work around this?
UPDATE:
Just to clarify, I am databinding my ListView in the Page_Init event. I then create the controls in the ItemBound event for my ListView. But based on what @Womp and MSDN are saying the controls won't actually be created until after the Load event (which is after the Page_Init event) and therefore are not in ViewState? Does this sound correct?
If so am I just SOL when it comes to retrieving the values in my dynamic controls from my OnClick event?
UPDATE 2:
So i changed the code i had in my Page_Init event from:
protected void Page_Init(object sender, EventArgs e)
{
if (!this.IsPostBack)
{
//databind lv_Questions
}
}
to:
protected void Page_Init(object sender, EventArgs e)
{
//databind lv_Questions
}
And it fixed my problem. Still a little confused as to why I want to databind regardless of whether it's a postback or not but the issue is resolved.
View 1 Replies
Mar 31, 2010
So all I want to do is simply find a user control I load based on a drop down selection. I have the user control added but now I'm trying to find the control so I can access a couple properties off of it and I can't find the control for the life of me. I'm actually doing all of this in the master page and there is no code in the default.aspx page itself.
MasterPage.aspx
[Code]....
MasterPage.cs
protected void goToSelectedPage(object sender, System.EventArgs e)
{
temp1 ct = this.Page.Master.LoadControl("temp1.ascx") as temp1;
ct.ID = "TestMe";
this.UpdatePanel1.ContentTemplateContainer.Controls.Add(ct);
}
//This is where I CANNOT SEEM TO FIND THE CONTROL ////////////////////////////////////////
protected void lnkSave_Click(object sender, System.EventArgs e)
{
UpdatePanel teest = this.FindControl("UpdatePanel1") as UpdatePanel;
Control test2 = teest.ContentTemplateContainer.FindControl("ctl09") as Control;
temp1 test3 = test2.FindControl("TestMe") as temp1;
string maybe = test3.Col1TopTitle;
}
Here I don't understand what it's telling me. for "par" I get "ctl09" and I have no idea how I am supposed to find this control. temp1.ascx.cs
protected void Page_Load(object sender, EventArgs e)
{
string ppp = this.ID;
string par = this.Parent.ID;
}
View 1 Replies
Feb 28, 2011
i have created a form and organize fields on asp table , row and cell..
then i am putting my controls (dropdownlist, textboxes,,,etc) in different table ow cells
The thing is when i try to select the control in design mode .,.it select automatically the table i tried to select the control in asp code but it does not give me control on it in design mode..wiered..
How can i view my controls in design mode..in other terms how can i select my controls in design mode.
View 7 Replies
Nov 1, 2010
i we click a table cell than color is blue and we again click a different cell the first color is remove and second is bule
[Code]....
View 1 Replies
Jun 7, 2010
I'm creating a web server control that has an image button on it in a table cell.The html for the server control is done in the RenderControls of the code, the server control devrives from WebControl, IScriptControl, INamingContainer and it is mostlly regular HTML with a few ASP.Net controls including the button.The button is coded as follow in the RenderControls:
[Code]....
The button apreas in any pages that uses the master page where the server control is used.When i click on it, the page postsback occures but the event handler for the button doesn't get fired, from what i can figure out, since the server control goes throught RenderControls each time the page is posted back, the button gets redrawn and the event handling disapears.
View 1 Replies
Feb 11, 2010
I'm having a weird problem where the GridView cell that I'm programmatically updating turns grey, and throws a null error when attempting to save row. I have been searching all day and have not been able to find a solution. I'm guessing there is a problem with my code, so here it is:
Protected Sub Button1_Click(ByVal sender As Object, ByVal e As System.EventArgs) Handles Button1.Click
View 5 Replies
Jan 14, 2011
I have two possible header rows for a DataTable that I build dynamically. Setting the value of a cell works fine. Adding the cell to a TableRow works fine. The problem comes in where I have to build a second possible header row that uses the same cell.
An example is below.
trHead1 = New TableRow
trHead2 = New TableRow
tcCalc = New TableCell
tcCalc.Text = "Rates"
trHead1.Cells.Add(tcCalc)
trHead2.Cells.Add(tcCalc)
As soon as I make the second row add the cell, the cell disappears from the first row. This really doesn't make sense to me but that seems to be the way it is. If there is a work around other than duplicating the lines;
tcCalc = New TableCell
tcCalc.Text = "Rates"
View 2 Replies
Nov 15, 2010
I'm sure I'm doing something wrong here, but I cannot figure it out.
This is in my aspx page:
[code]....
And this is in my aspx.vb page:
[code]....
View 2 Replies
Feb 5, 2011
I have a gridview with 4 columns....time,Collage,Personal and reminder
in first column + is a image Button and 8am is a linkbutton 8am,9am,10am.....etc
are coming from gridview binding with daytime.xml...
time || Collage || Personal || Reminder
8am+
9am+
10am+
11am+
12am+
------
8pm+
Problem (1)
i want to store the value(eg. 8am,9am,10am...) in a string variable on clicking of that cell...
and according to selected time i want to save the event.....
Problem (2)
I want to show data from table named PlannerMaster in the Collage,Personal,Reminder Column..
is it possible to show data in First Column From Any xml file And another 3 Columns from any other table/Datasource.........
Problem (3)
I also want to change the backcolor of column ..according to the saved event
For Example if any event for Personal Category (in our gridview Column no. 3) from 8am to 11am..at that condition i want to show the row 8am to 11 am with backcolor Yellow...
same for Functionality For Collage and Reminder Column .....
this will help user to visualize in which time duration he is engegged/busy.....
I have started to solve these tasks by my own...but want to do this in easy and proper manner..
View 4 Replies
Feb 9, 2011
I'm trying to implement a custom GridView to find a cell by its name. Here is my class:
[Code]....
how I can implement the SET part of property?
View 3 Replies
Apr 20, 2010
I need to do a drag n drop for table cell. I need every feature of Ajax ReorderList such as when item 2 is drag to position no 3, item no 3 will be automatically goto position 2. However i need every item in Ajax ReorderList .
I have try many ways in trying it such as using customized tool: Telerik (RAdGrid,Scheduler), DevExpress , ComponentGo! and also PilotScheduler but all does not fullfill the business requirement. May be the requirement for solution is too rigid. Below is my table design
Date1 | Date 2
Shift1 | Shift2 | Shift3 |Shift1 | Shift2 | Shift3
Mch 1 Product1 Product3
Product2
Mch 2 Product4
Mch 3 Product5
User must be able to rearrange the item for example, user can drad Product 5 to Mch1 on date 1.
Does anyone has idea on this by binding ajax ReorderList to Table ??
View 2 Replies
Aug 10, 2010
How do we code "findcontrol" with a third party control? I tried "TextBox" for Namespace="FreeTextBoxControls" Assembly="FreeTextBox" and it threw an error:
Object reference not set to an instance of an object.
Here is the offending line:
Dim Body As String = Convert.ToString(CType(lsvBlocks.InsertItem.FindControl("FreeTextBox"), TextBox).Text)
View 3 Replies
Jan 12, 2010
I'm hardly an expert in css, so this is a bit frustrating. I have a grid that was filled with a repeater. I want each row to have a 1px border along the bottom to visually separate the rows.
#repeaterTable
{
border-left: 1px solid #A3A3A3;
border-right: 1px solid #A3A3A3;
border-collapse: collapse;
[code]...
View 3 Replies
Dec 22, 2010
I'm using a skin file, and within the skin, I'm applying all the settings using CSS. I've got most parts working, but how do I set 'CellPadding="1" CellSpacing="3"' using CSS?
[Code]....
<asp:GridView runat="server" GridLines="None" AllowPaging="True" AllowSorting="True" CssClass="GridView" CellPadding="1" CellSpacing="3">
View 2 Replies
Mar 19, 2011
I had a problem for a long time but now wonder how I will solve this. Perheps it is easy.
I have a <table> with two <td>. This <table> resides inside a GridView, so I FindControl like below. Now I need to do a calculation of height that if MessageBox1 have a height that is less than 306, then I need the MessageBox2 to have the remaining height.
For example if MessageBox1 has the height of 206, then MessageBox2 need to have the height of 100.
I think my problem is how to convert the height of MessageBox1 correctly and set the remaining height to MessageBox2 ?
[Code]....
View 3 Replies
Jun 7, 2010
I have an asp table with 15 rows and 12 columns, each cell as an ID and the cell names are like Cell1, Cell2, Cell3, etc.
I need to change the background color of the cell but the name of the cell comes from a string.
Something like:
strCell = "Cell3"
strCell.bgcolor = "Red"
How do I "convert" this string to access the cell properties?
View 4 Replies
Aug 31, 2010
How to fill the gradient colors in table cells?
View 6 Replies
Mar 18, 2011
I have a form with a basic FormView control. The FormView is set to Edit mode by default with only two textboxes and one button. I am populating the FormView using a Datatable from the code behind generated from a SQL Stored Procedure.
The data fills the FormView just fine. I am attempting to update the data using a SQL Stored Procedure by getting the values from the textboxes in the FormView on button click Everything seems to work and I recieve no errors, however the values I type into the textboxes is not passed to the stored procedure so eventhough there are no errors the data is not updated.
I know that the issue is not my stored procedure becasue if I use static values for the parameters in the code behind, the values are updated by the stored procedure.
I placed two plain textboxes and a button on the ASPX form and create a button click event for that button using the same code I use for the butten click event in the formview. When I add values to the non-databound textboxes, the data is updated correctly.
The question is, why can I not get the updated/changed values from textboxes in the FormView control?
Here is my ASPX code:
[Code]....
[Code]....
View 2 Replies
Feb 25, 2010
I am using the html table in my aspx page.
On a button click i will find a cell using the inputs -row index and cell index . I am setting a black border to the cell as follows
[Code]....
On giving next inputs i want to reset the border of previously selected cell and set border to newly found cell.
i have no way in my hand to reset it.
View 2 Replies
Apr 9, 2010
how to set the space between the textarea and table cell.
it is always have a space at the bottom of the textarea and the bottom border of table cell
how to set using javascript
View 4 Replies
