Web Forms :: Talble Resetting After First AutoPostBack / Maintains Data Thereafter?
Mar 4, 2011
I've been working on this bug for a while, but I'm at a loss. I have a table I'm building up based on the item selected in a DropDownList. The table gets built, and consists of a bunch of text fields, drop downs and check boxes. The fields work in that you can input whatever values you want, however if you change an item with AutoPostBack enabled, the entire table resets to its default values.
This is slightly peculiar -- and undesired -- but what makes it so strange to me is that after this if you then type in data again and use anything that AutoPostBacks, the table maintains its values (and continues to do so if you AutoPostBack any number of times). I would really appreciate it if anyone could give me some insight on why this might be happening.
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Similar Messages:
Mar 29, 2010
I am using an asp.net autopostback enabled dropdown list. Here i want to restrict the autopostback property fot the value "Select" in the ddl. I have used javascript for this purpose. but not working.My code look like this.
[Code]....
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May 11, 2010
I have on top of the page..
Dim dsDataset as new dataset
In the page load..
If ispostback = false then
dsDataSet = .....
END IF
Now I have a button where when clicked..
dsDataSet = anotherdataset...
Now I have 1 button that all what it does is loop through the dataset..
For each row in dsDataSet.tables(0).rows
Now the problem is that when I click on the last button, it says (cannot find table 0) which means the dataset is empty, why does the info in the dataset get removed on the postbacks? how can I avoid this?
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Jan 19, 2011
I have a webform with multiple input textboxes. each box is used in computing somethings, and i am doing these calculations within the TextChanged event for each textbox...this way after the user enters each entry, all calculations requiring that data is performed. I have also set EnableViewState="true" and AutoPostBack="true" cause I am trying to have the textbox keep their data displaying on AutoPostBack. The form is not behaving the way I want it to...right now, if a user inputs data in one field and switches focus to the next, the previous box losses it's data. Is there a way i can get this behaving the right way? I basically just want all the controls to keep their data on AutoPostback.
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Sep 23, 2010
I have a grid which is getting bound from a dataset and the autogeneratecolumns prperty is set to true.
Now i have a menu control. And when i select a particular cell, I want to headertext of the cell selected should appear as the text of the menu item.
But because autogeneratecolumns = true, so i gridview.columns.count=0. So not able to get the header text.
The code goes as follows.
[Code]....
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Jun 15, 2010
I have a Gridview control with a panel inside a template column and I dynamically add a checkbox control through code to the panel and the checkbox has autopost set. My problem is when I click the checkbox it dissappears on autopost back. I have tried to recreate the control again on the event OnDataBound but when I cast the sender as checkbox I get nothing. How can I not loose my checkbox on postback and why is (Checkbox)sender return nothing.
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Feb 18, 2011
I have a DropDownList in a GridView with AutoPostBack="true" and on SelectedIndexChanged fires an event.
[Code]....
Everything works fine across browsers as long as the user is scrolling through the DropDownList using a mouse.In IE8, things start to go haywire when the user is navigating the DropDownList using up/down arrows on the keyboard. The SelectedIndexChange event is fired with nearly every up/down key pressed. In Firefox 3 and Chrome 9, the behavior is more like what I would expect, that the event isn't fired until the user stops on DropDownList selection and hits the enter key.
Is there something that I should be doing in IE, short of setting AutoPostBack="false", so that the event is fired every time the up/down arrows are used on the keyboard?
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Feb 16, 2010
I have a Gridview that provides the user the student name for a particular class, a dropdown list to enter grades. If a grade of 'U' is given, a textbox appears in which the last day of attendance must be listed.
It works... though not as conviently as it could; the faculty would like to be able to tab from one dropdownlist to next in succession.
On each ddlGrades changes I write the value to the database and if a 'U' was chosen, display the textBox... but I can't figure how to set focus on the next ddlGrades control, or even the same ddlGrades control that initiated the postbock.
Below is my simplified .aspx followed by the codebehind
[Code]....
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May 17, 2010
In my gridview, I have a column for Amount. I want to calculate the amount as soon as user changes the Amount and display calculated Amount in a textfield. What I have done is I have Amount as Templatefield and have set Autopostback = true. In the event handler for textChanged I have function for calculate Amount which will calculate the amount and set the calculated value in a textbox. But I am getting an error message:
[NullReferenceException: Object reference not set to an instance of an object.]
UpdateInvoice.calculateamt() +87
UpdateInvoice.txtAmt_TextChanged(Object sender, EventArgs e) +5
System.Web.UI.WebControls.TextBox.OnTextChanged(EventArgs e) +8739438
System.Web.UI.WebControls.TextBox.RaisePostDataChangedEvent() +55
System.Web.UI.WebControls.TextBox.System.Web.UI.IPostBackDataHandler.RaisePostDataChangedEvent() +10
System.Web.UI.Page.RaiseChangedEvents() +165
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Mar 25, 2010
I have spent days trying to research this to figure out what is going on. I tried changing most of the settings in IE8 (both users are using IE8 but I have no idea if it does it IE7 or Firefox too) , logging in and out as different users, closing, opening, deleting internet files, and it won't break. They have the site in the Trusted Sites list. They don't have trouble with it dropping their Forms Authentication either, so it isn't losing authentication.The admin user suggested it had something to do with her having multiple tabs and sessions open. But I tried all of that, and it never broke. I have seen erratic behavior on occasion if a rogue IE8 process doesn't exit properly
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Feb 3, 2010
I have a web site that works fine on the server. I purchased a new domain and set that up on my web server and set the home directory on to the server to the same location as the site that works.
However, my forms authentication ticket is being recreated on every page post back. Is there some setting in IIS that I'm missing under the new domain(IP)? If I access the site under one domain the ticket is saved and tracked fine. When I access it from the second domain (same home directory as first domain) the ticket is lost on postback.
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Jan 31, 2011
I am dealing with dynamic fields in a for loop and now I need to retrieve the values that are being typed in the dynamic fields, any idea how can I do that? 2)also when I click the submit button, upon postback, the dynamic fields have gone missing, have been trying to slove that, but i did not, anyone knows how to deal with this? kinda urgent :x
3) and How do you compare the 2 dynamic fields? For eg: Im comparing the tbSch[i] to tbSch[i], so that the dates cannot be the same, am using a compare validator, but it throws me error that im comparing the same fields :) even though i change to ("tbSch" + i) for both, sorry Will provide my code snippet as follow :D tbNum is a textbox where user enter numbers and click generate
protected void btnGen_Click(object sender, EventArgs e)
{
for (int i = 0; i < Convert.ToInt32(tbNum.Text); i++)
{
// label and textbox needed
Label lblSch = new Label();
TextBox tbSch = new TextBox();
Label lblWsGrp = new Label();
DropDownList ddlWsGrp = new DropDownList();
CompareValidator cvSame = new CompareValidator();
cvSame.ID = "cvSame" + i;
cvSame.ErrorMessage = "Date cannot be the same";
cvSame.Operator = ValidationCompareOperator.NotEqual;
cvSame.Type = ValidationDataType.Date;
cvSame.Display = ValidatorDisplay.Dynamic;
cvSame.EnableViewState = true;
cvSame.ControlToValidate = (tbSch.ID);<<<<< what should be the value in here?
cvSame.ControlToCompare = (tbSch.ID);<<<<<<<<<< and here?
//schdule date
lblSch.ID = "lblSch" + i;
lblSch.Text = "Session Date : ";
lblSch.EnableViewState = true;
tbSch.ID = "tbSch" + i;
tbSch.Width = 210;
tbSch.Height = 27;
tbSch.EnableViewState = true;
//workshop grp
lblWsGrp.ID = "lblwsgrp" + i;
lblWsGrp.Text = "Workshop Group : ";
lblWsGrp.EnableViewState = true;
ddlWsGrp.ID = "ddlWsGrp" + i;
ddlWsGrp.Height = 27;
ddlWsGrp.Width = 210;
ddlWsGrp.EnableViewState = true;
ddlWsGrp.Items.Add("1");
ddlWsGrp.Items.Add("2");
//table to store data
TableRow trow = new TableRow();
TableRow trow2 = new TableRow();
//row1
TableCell tc1 = new TableCell();
TableCell tc2 = new TableCell();
TableCell tc3 = new TableCell();
TableCell tc4 = new TableCell();
//row2
TableCell tc5 = new TableCell();
TableCell tc6 = new TableCell();
TableCell tc7 = new TableCell();
TableCell tc8 = new TableCell();
TableCelltc9 = new TableCell();
tc1.Controls.Add(lblSch);
tc2.Controls.Add(tbSch);
tc3.Controls.Add(lblWsGrp);
tc4.Controls.Add(ddlWsGrp);
tc5.Controls.Add(space);
tc6.Controls.Add(CeSess);
tc7.Controls.Add(space);
tc8.Controls.Add(space);
tc9.Controls.Add(cvSame)
trow.Cells.Add(tc1);
trow.Cells.Add(tc2);
trow.Cells.Add(tc3);
trow.Cells.Add(tc4);
trow2.Cells.Add(tc5);
trow2.Cells.Add(tc6);
trow2.Cells.Add(tc7);
trow2.Cells.Add(tc8);
trow2.Cells.Add(t9);
this.table3.Rows.Add(trow);
this.table3.Rows.Add(trow2);
}
}
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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.
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Jun 7, 2010
I have an aspx page for Search Options. There are three aspx Dropdown List Controls that are each bound to seperate data sources. The selection made in the Dropdown control is used in a SQL Query within a GridView data source to display the results list.
When I select an item from the drop down list I get the search result, but I want the drop down list to return to it's initial state after it displays the result, so the next selection made will clear the results list from the first selection. I have tried a number of different approaches, but no success. Seems like this should be easy, but I'm new to coding.
I have found a couple of possibles on the forum, but they didn't work. Not sure if you can make any sense of this, but I'll try to give you something more to go on. All I really want to do is reset the dropdown after it displays the results of the search, which I assume is after a PostBack. Here is what I have tried in the Code Behind or Script.
This for just one of the Dropdown Lists, ID=Practices. I have been trying to make this work for way too long. Also, I have tried it with AutoPostBack set to true but same problem. Currently have a 'Submit" button on the page to initiate the search.
[code]....
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Apr 8, 2010
I have a gridview and dropdownlists that I want to use to filter the gridview by. I am trying to mimic the Filter functionality in Excel.The current problems I am having are:The dropdown is losing the selected value during the postback. It selected value goes back to All.I cannot use the dropdownlist to select "All" to remove the filter.ode is below.Page Code:
<%
@
Page
[code]...
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Jan 27, 2010
I'm using jquery tab and following js method, how and what can i modify it to maintain state of tab between postbacks? (This resets tabs to first tab after page_load)
[Code]....
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Jan 24, 2011
In trying to improve 'user experience' with a GridView, I have an administrative application where a GridView is displaying records from a SQL table. One of the columns is a bit column, and is displayed as a checkbox in the GridView. I want the user to be able to simply check or uncheck the box while viewing the GridView, and the value in that column for that record is immediately updated. So I set AutoPostBack="true" on the CheckBox in the GridView's Template Field.
But tests are indicating that the column value is not actually getting changed, even though the page appears to post back and displays the newly checked (or unchecked) checkbox correctly. But if I check the SQL table directly the column's value has not changed.
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Dec 25, 2010
i am developed a grid view using tmplate fields. i have done addition and deletion of row using java script and ajax(using web method). now i want to impliment the editing of the grid row using javascript without autopost back Here is the template field i am using.....
<asp:TemplateField HeaderText="EmailId">
<ItemTemplate>
<asp:Label ID="Label4" runat="server" Text='<%# Eval("EmailId")%>'></asp:Label>
</ItemTemplate>
<EditItemTemplate>
<asp:TextBox BorderStyle="None" ID="txtEmailId" runat="server" Text='<%# Eval("EmailId") %>' Width="80px"
Visible="true"></asp:TextBox>
</EditItemTemplate>
</asp:TemplateField>
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Sep 8, 2010
I have a checkbox placed inside a gridview:
<GridView><asp:TemplateField HeaderText="Driver"> <ItemTemplate> <asp:CheckBox ID="CheckBoxDriver" AutoPostBack="true" OnCheckedChanged="GridView_Persons_SelectedIndexChanged" ValidationGroup='<%# Eval("ID") + "-" +((GridViewRow)Container).RowIndex %>' CssClass="CXDriver" runat="server" Checked='false' /> </ItemTemplate> </GridView>
For example: A listViewItem 1 has 3 drivers are checked, A listViewItem 2 has 2 drivers are checked.
Therefore, if changing the selectedIndex of the list, the checkbox indexChanged event will be fired.
How could I disable the autopostback of the checkbox during the listview item changed.
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Nov 18, 2010
Probably a simple fix to this I am not sure. Basically, I have a MasterPage that contains a Dropdownlist. This DDL controls what is displayed in ContentPlaceHolder. However, when postbacks are caused within the Contact Pages the DDL is resetting itself. How can I keep the selected value for the DDL between postbacks?
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Jan 27, 2011
I have a Customer table --> CustomerNumber and CustomerName columns
I have a Sales table --> CustomerName columns
I have a Label (represent CustomerNumber) and a DropDownList (represent CustomerName)
I getting to DropDownList Sales table --> CustomerName with SqlDataSource.
I want automaticly (with AutoPostBack) filling Label with CustomerNumber which CustomerName selected in DropDownList
Example SQL:
select A.CustomerNumber from Customer A, Sales B where B.CustomerName = DropDownList1.SelectedItems.Value
I'm thinking like this. How can i do that?
protected void DropDownList1_SelectedIndexChanged(object sender, EventArgs e)
{
}
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Apr 23, 2010
I created a MultiView with about 10 different views for a data entry program. As the user steps through the process, they key the data requested and conditionally takes them to the next appropriate view and stores the keyed data from a text box in a session variable. At the end of the process, it displays all of the information that was keyed and then using the on_click handler on the confirm button I insert it into a SQL table and provide a confirmation number. After that is complete, the user will click home, which defaults the activeviewindex back to 0 and proceed with keying the next callers information in.
When they click home and start to proceed back through the screens, it has all of the information from the previous session prepopulated in all of the controls. Since I am not really using a form submit, I can't figure out how to reset all the textboxes and session variables after the SQL insert. I tried looping through the controls but I guess they have to be active to clear them and am looking for something simple to perform this operation without manually setting each textbox.text back to "".
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Feb 24, 2010
It took me a little while to figure this out, but the AllowPaging="true" on the FormView seems to be the culprit. I don't have much experience paging from a FormView, but for this requirement the customers wants this kind of UI.I have a FormView with DefaultMode="Edit", which is bound to an EntityDataSource. One of the entity's properties, "ExternalID", determines whether some of the other properties in the entity are read-only. For example, if IsExternal==null, the FirstName, LastName, and Email fields should be rendered as TextBoxes. If IsExternal!=null, the 3 properties should be rendered in Label controls.
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Dec 21, 2010
Can I objectively determine if my production ASP.NET web application is resetting its application pool? It could be for whatever reason (for example, an error occurred or memory topped off). I don't have direct access to my production servers, so when I want something on the server, I have ask specifically for it like PerfMon counters to run. It is a running IIS 6.0. I understand that I could use PerfMon to catch ASP.NET Application Restarts. If I was not monitoring that PerfMon, is there anything that can tell me the application restarted sometime in the past?
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Aug 26, 2010
I've got an website running on a third-party hosting server. Now I've got a few objects in global asax. But once in like 6 hours or so (didn't really check how long) the object gets reset to default values.Is this an problem in global asax that it reset's himself or is this the server on which I'm hosting?
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