I have a script which creates a dynamic textbox (and more) in an AJAX async post back. But when I try to acess the textbox I am told "Object reference not set to an instance of an object". I have been strugleing with this for a long time. This is written in C# .Net 4. The line causing the problem is the very last one where I have tbGameName.Text.Trim()
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My problem is:
I've got a table, dynamically created, fill with a lot of dropdownlists witches IDs are dynamically created.
When a button is pressed, I need to scan all controls in the table and save their value.
But after the postback I can't no longer access to the table.
I dynamically create gridview, and in this grid I have template field also
field.HeaderTemplate = New GridViewTemplate(ListItemType.Header, col.ColumnName)
field.ItemTemplate = New GridViewTemplate(ListItemType.Item, col.ColumnName)
grdEmpty.Columns.Add(bfield)
but when enter some value in text box in this template field i lose value on postback. And also on postback I lose all template field and i must re-create this grid.
My goal is: I have button and i want to add new row in this grid, but i want to have old value also.
I need to access the controls dynamically created template fields at run time in datagrid in post back event. Is there any way to retrieve the values in post back event? Or else give the ideas to acheive my requirement. I need to create no of rows and columns as text box as per user input. After fill the values to text box , i need to access the values in submit button.
View 1 RepliesI have a grid view that is dynamically created.In which every cell in the girdview has a 2 textbox (cTxtboxQty,ctxtWorkOrder) and 2 label.
When user click on the cell, a pop up come out and user are able to change the text inside the cell and click save.After that the pop up close and changed data immediately reflected on the screen.
My problem is:
After my data are changed and updated to database on the pop up page and having it post back to the parent page , my dynamically created textbox in gridview retain old value even new value has been assigned to it.
This sound very weird but i have no idea how to solve this.
My client side code is as below :
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I have tested many times and find out that it might be the page hold the old value in memory, so that even we have updated the textbox value, after postback, it still keep and show the old value?
So I have two UpdatePanels. I am dynamically creating server-side buttons in UpdatePanel2. When the buttons come out, they are not hooked to the asynchronoustriggers of updatePanel1.
So how can I dynamically add these triggers of these newly dynamically created buttons so that clicking these buttons will only cause a partial postback to UpdatePanel1 ? Right now, when I click these buttons, it causes a partial-postback refresh to UpdatePanel2 (the panel itself that which the controls reside in)
I have a small form with some static elements that I am able to access with javascript the bring up a popup. 4 textboxes are generated and attached to a updatepanel. I've been trying various methods of validating the contols without generating postback.
I found anytime i registered a javascript to the scriptmanager the page must refresh.
Is there anyway it can be done?
i have a WSS 3.0 Webpart that contains an UpdatePanel with a customized SPGridView. I want to provide instant filtering of data by adding a textbox below the column header when the column shall be filterable. There is a jQuery based solution for this on the net, but it's totally client side and doesn't work with paging, so i tried it on my own.
In the CreateChildControls of my SPGridViewExt class i have :
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I've also overridden the DoFilterPostBackEventProcessing method to create a "[ColumnName] LIKE '%[textbox.value]%'" filterExpression for my datasource which also creates the LIKEFILTER_COLUMN and LIKEFILTER_VALUE ViewState Items so i can identify the textbox that should refocus on after the postback. The filtering itself works great, but whatever i try, i am not able to set the focus to the textbox after entering the first letter.
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All these four methods don't work. The registerstartupscript call doesn't even render the script when i search the page source after postback. I also tried to add a HiddenField to my webpart and set it's value to the control id of the textbox in onfocus, then register a startupscript in OnLoad that focuses the control if the HiddenField has a value, but to no avail.
I know this question has been asked thousands of times, and I've struggled with it before, but for some reason, I can't accomplish what I want to accomplish... I have a dynamically added LinkButton that when clicked will dynamically add a control (in this example, a textbox) to the same panel. The intent is to continuously add on as many controls as times the LinkButton was clicked (i.e. I click it once, one box, then another click will give me 2 boxes, another click adds a 3rd). In the code below, I use the current date and time serialized to create a unique ID for each textbox control.
When I execute the code, clicking "Add Filter" will generate a new textbox, but once clicked again will create a new one, and dispose of the one before it. Instead, I want to persist the previous textbox as well as any data submitted within it.In the aspx:
<asp:Panel ID="pnlFilter" runat="server">
</asp:Panel>
In the aspx.cs:
protected void Page_Init(object sender, EventArgs e)
{
LinkButton lb = new LinkButton(); [code]....
In my code I create a table dynamically and I try to restore the table after a postback. But although I recreate the table during the Page_Load event with the same id's before,the table doesn't appear with the same state and values as before.
I think it will be a typically beginner error, but I wasn't be able to locate the error whereas reading different posts and tutorials related to this topic.
//Code behind
protected void Page_Load(object sender, EventArgs e)
{
if (Page.IsPostBack & _hfsubmittedURL.Value == "tbCreated")
{
TableRow row1 = new TableRow();
[Code].....
I know this has been asked before, but I feel like I'm losing my way trying to follow the other examples out there. Does anyone see a straightforward solution to my particular problem?
Goal:
Two column Master Page
Left column contains a list of [stuff] (I'm trying a Repeater with LinkButtons)
Right column contains a TabContainer which will add dynamically created tabs when buttons on the left are clicked.
Left side looks like this:
<asp:Repeater
<ItemTemplate>
<asp:LinkButton ID="lbShowReport" runat="server" Text='<%# Eval("Title") %>' CommandName="Select">
</asp:LinkButton>
<asp:HiddenField ID="hfReportID" runat="server" Value='<%# Eval("Id") %>' />
</ItemTemplate>
</asp:Repeater>
I had initially been creating tabs in the LB's OnCommand event, but of course this means that any tab generated by one click is lost if the user clicks another LinkButton.
So I moved the code to create a new tab to the OnInit section of the page and attempted to loop through the RepeaterItems comparing the UniqueId of each LinkButton until I found the one that was clicked using Request.Form["__EVENTTARGET"].
When I tried to loop through the RepeaterItems, however, the count was always 0, and the Repeater would not populate.
So now I am rebinding the Repeater in the Init section on every post-back - this allows me to find the LinkButton that was clicked. I then add the new Tab based on the LB that was clicked like this:
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This properly adds new Tabs to the TabContainer using this code:
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but I still have the issue where I can only ever have one dynamically created tab in the TabContainer at a time. All of the code above is being executed in OnInit, which I thought would save the tabs during post-backs, but instead this is behaving as tho I was adding the tabs in the OnCommand event of the Link Button...
I'm passing a List to an MVC view and generating checkboxes for each object in the list (The checkboxes are named t.Name).I'd like to be able to tell which checkboxes were checked once the form is posted. However, I'd like to avoid using the FormCollection object.
View 1 RepliesI add HTML and tags to Page dynamically. But after every postbost, all values are empty. What can I do for Solve?
View 2 Repliesi have created Array of Linkbutton and when user click on link button it will create an array of Radio Buttons but it requires Postback all time so page load takes more time...
View 2 RepliesI have a couple of RadioButtons that are created dynamically. But after postback they don't retain their checked property. I also have some CheckBoxes and they work just fine using the same mechanism (code below). I have narrowed down the problem to the "GroupName" property. If I remove it, it works just fine. But I need the RadioButtons to be mutually exclusive.
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I created a templatefield programmatically and it works fine but whenever I clicked the button inside the gridview and do the postback my templatefield are gone.
View 3 Replies<asp:GridView ID="GridView1" runat="server" >
<asp:TemplateField HeaderText="Token" SortExpression="Token" HeaderStyle-Width="100px">
<ItemTemplate>
</ItemTemplate>
</asp:TemplateField>
</asp:GridView>
update:
after i view the source code of the page thsi is what i see the id of a textbox that i have created dynamic.
ctl00_ContentPlaceHolder1_tabControl_tabUsers_MyControl1_gv_ctl02__token0_3
OnRowUpdating:
TextBox _token = gvOrg.Rows[e.RowIndex].Cells[7].FindControl("_token " + e.RowIndex + "_" + rowId) as TextBox;
Update end:
i am adding few textbox dynamic in OnRowDataBound and whe i try getting the value then i am getting null
here is my code:
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I use this method for inserting a textbox in a tablecell
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But it doesn't work. beacuse it doesn't find the textbox created previously.
I've put also EnableViewState="true" in the file aspx.
i am creating Textboxes at Runtime with something like this
Code:
Dim cnt As New TextBox
cnt.ID = "cont_" & x
If multiline Then
cnt.TextMode = TextBoxMode.MultiLine
End If
These are dynamically created fields. so what i want to do is to use this following JQuery on this textbox
Code:
$(document).ready(function() {
$("#contentbox").keyup(function() {
var box=$(this).val();
var main = box.length *100;
var value= (main / 145);
var count= 145 - box.length;
if(box.length <= 145) {
$('#count').html(count);
$('#bar').animate({"width": value+'%',}, 1);
}
return false;
});
});
and what this function does it count the number of Characters that have been typed in a Textbox. so i am displaying the remaining characters. So that is working fine on my example because the Element is known at Early Binding. Now my question is what if the textbox is created dynamically ?
Code:
contentbox
this is the name of the Textbox in my example. how do we use a J Query in Dynamically created Textbox.
In design time I created a Gridview and a delete button in a page test.aspx:
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The program stopped at statement "if ((row.Cells[COL_INDEX_SELECTED].Controls[0] as CheckBox).Checked)",
because it cannot find the checkbox created before.
I tried to shift all the code in Page_Load to Page_Init, but the ticked checkboxes are still lost.
I could find the ticked checkboxes names in its request object parameters(this.Request.Params.AllKey) if I setup a breakpoint on the error statement.
Does anyone konw what's happening and how to retrieve the selected rows?
how can store the text value of dynamically created textbox in database.
using System;
using System.Data;
using System.Configuration;
using System.Collections;
using System.Web;
using System.Web.Security;
using System.Web.UI;
using System.Web.UI.WebControls;
using System.Web.UI.WebControls.WebParts;
using System.Web.UI.HtmlControls;
using System.Data.SqlClient;
public partial class frndslambook : System.Web.UI.Page
{
SqlConnection con = new SqlConnection(ConfigurationManager.ConnectionStrings["ConnectionString"].ConnectionString);
SqlCommand com1;
SqlCommand com;
SqlDataReader dr1;
static string[] exp;
static string exp1;
static long c;
TextBox[] textBoxArr = new TextBox[c + 1];
protected void Page_Load(object sender, EventArgs e)
{
com1 = new SqlCommand("Select * From slambook Where username=@username", con);
com1.Parameters.Add("@username", SqlDbType.NVarChar).Value = Session["userfrndname"].ToString();
try
{
if (con.State == ConnectionState.Closed)
con.Open();
dr1 = com1.ExecuteReader();
if (dr1.Read())
{
string exp1 = dr1["slambookfields"].ToString();
long c = Convert.ToInt64(exp1.Length);
Label[] l1 = new Label[c + 1];//array of lables
TextBox[] textBoxArr = new TextBox[c + 1];//array of textboxes
exp = (exp1).Trim('^').Split('^');
for (int i = 0; i < exp.Length; i++)
{
Panel frndstextBoxLabelGroup = new Panel();
l1[i] = new Label();
l1[i].ID = "frndslambooklabel" + i.ToString();
l1[i].Text = exp[i].ToString();
l1[i].Visible = true;
textBoxArr[i] = new TextBox();
textBoxArr[i].ID = "frndslambooktextbox" + i.ToString();
textBoxArr[i].Visible = true;
//Initializing the TextBox so that it is not rendered in the browser
frndstextBoxLabelGroup.ID = "frndstextBoxLabelGroup" + i.ToString();
fspfrndslambook.Visible = true;
// Pnl_TextBox.Controls.Add(br);
frndstextBoxLabelGroup.Controls.Add(l1[i]);
frndstextBoxLabelGroup.Controls.Add(textBoxArr[i]);
fspfrndslambook.Controls.Add(frndstextBoxLabelGroup);
}
}
}
catch (Exception exc)
{
}
finally
{
con.Close();
}
}
protected void fsbfill_Click(object sender, EventArgs e)
{
com = new SqlCommand("Insert Into slambookans (slambookfields_ans,sender,receiver) Values(@slambookfields_ans,@sender,@receiver)", con);
for (int i = 0; i < exp.Length; i++)
//{
//textBoxArr[i] = new TextBox();
com.Parameters.Add("@slambookfields_ans", SqlDbType.NVarChar).Value =textBoxArr[i].Text;
}
com.Parameters.Add("@sender", SqlDbType.NVarChar).Value = Session["username"].ToString();
com.Parameters.Add("@receiver", SqlDbType.NVarChar).Value = Session["userfrndname"].ToString();
try
{
if (con.State == ConnectionState.Closed)
con.Open();
int i=com.ExecuteNonQuery();
if(i!=0)
Response.Write("Success");
else
Response.Write("Fail");
}
catch(Exception exc)
{
}
finally
{
con.Close();
}
}
}
I'm using multiple file upload. I'm following this link [URL] . I can able to save multiple files. Now i want add textbox to all file upload. I can add HTML Text box. I don't know how to find that? I'm using following code to upload multiple files..
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I've a JavaScript function in my page through which i make some elements in the page as 'JQuery UI droppable'.
function setDroppableTargets()
{
$(.cssDockZone).droppable();
}
But the elements with the class cssDockZone is created dynamically upon user interaction. So in the code behind i create the control first and finally at the end i register a scriptblock which calls setDroppableTargets().
//set droppable targets ClientScript.RegisterClientScriptBlock(this.GetType(), "setDroppableTargets", "setDroppableTargets()", true);
But the javascript function is invoked before the controls are created eventhough i register the script at the end (after creating the controls) and i cross checked it by getting the elements with class name '.cssDockZone' and i getting it as 0.
$(.cssDockZone).length
I want to dynamically create asp textbox objects (as well as other types) with id's named sequentially up to a number the user decides but I'm having a problem getting my code behind to recognize these dynamically created objects. In "div1" below I manually create the objects and I have no problem getting the values in Sub cmdSaveDiv1Info_Click. My dynamically created code generated in Page_Load routine is identical to that in "div1" except for the textbox ID's yet when I try to retrieve the values the same way in cmdSaveDiv2Info_Click I get an "object reference not set to an instance of an object" error on the "Dim d2Year as String.." line.
[code]....
I have a page that contains many textboxes. It is like 9 textboxes for everyday in a month, and their numbers and IDs are changing dynamically for every month change on the page. I'm creating them in many for loops like;
[Code]....
This was just an example not real code. Now I want to add those textboxes the same TextChange event. How can i do it? I'm a little bit newby at asp.net. Sorry about that...