Web Forms :: How To Get Textboxes To Keep Their Data On AutoPostBack
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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Similar Messages:
Oct 29, 2010
I have a form with several textboxes. All of these have AutoPostBack="True".
My problem is that the focus disappears to goodness knows where after each postback. The behaviour I would like to enforce is as follows,
If the user hits the Enter or Tab key after filling in a textbox then the focus should go to the next field on the form (to be explicitly specified in my code).
If the user clicks on textbox X after filling in textbox A then the focus should go to textbox X after postback, even if it is not the next in the list.
In other words, I want the form to behave in the way that most users would intuitively expect.
I have Googled for potential solutions to the loss of focus after postback but the few that I have found were many years old and I am unsure that the advice is still relevant for ASP.NET 4.0. Some of these old solutions also appeared to be invalid for browsers other than IE. What is the current best practice for handling this issue?
BTW, VB.NET solutions are preferred though I will also be happy to accept C# suggestions (which I would run through a code converter). Note that I have a single sub in my code for handling the TextChanged events for all my textboxes. This means that I have to use the following code to work with the textbox that has called the sub.
Dim CurrentTextBox
As
TextBox =
DirectCast(sender,
TextBox)
If addressing the focus problem means that I have to have individual TextChanged event subs for each textbox then so be it, but I prefer the simplicity of my current single sub approach.
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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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Aug 11, 2010
I have a repeater which is binded using a Collection of Entity Data Framework.
Once the repeater is binded using the datasource, the user can control the no of rows present in the repeater using a Dropdown list on the page. For ex: if datasource has 2 rows, user want to add 3 more rows, user selects 5 from dropdown, which adds 3 additional rows to the Repeater. I am able to do this.
The repeater has textbox controls in each row. Now once the user enter the values in this textbox of the newly generated rows, the user can save the values entered with the no of rows specified.
I have a button which is outside the repeater and on click of this i need to validate all the textbox values and save them into dB accordingly.
Here is my code
Repeater.aspx
[Code]....
[Code]....
Repeater.aspx.cs
[Code]....
Right now the problem is im not able to fetch the values of the textboxes present in the newly generated rows.
[URL]
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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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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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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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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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Sep 30, 2010
I've done this using bound controls like Repeaters etc but now I need to display information about a single file for example. SO i will pass the fileid in the querystring, then I need to populate some textboxes, autocomplete textboxes etc. and then save changes. what's the most efficient way of doing this?
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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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Oct 8, 2010
This procedure is call from the page load:
Private Sub ImportDataFromDataset()
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Nov 27, 2010
I am having my gridview as follows
<asp:GridView AutoGenerateColumns="False" ID="ResultGridView" runat="server" HeaderStyle-Font-Bold="true"
HeaderStyle-ForeColor="Blue" PageSize="5" BackColor="#DEBA84" BorderColor="#DEBA84"
BorderStyle="None" BorderWidth="1px" CellSpacing="2" OnRowDeleting="ResultGridView_RowDeleting"[code].....
I will have some data binded to gridview.When i click on select i would like to display the data individually to textboxes
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Sep 28, 2010
I m getting data into GridView. I want to display the 1st row data in some textboxes in the same page.
How to get the Values of 1st row and how to display those values in textbox.
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Mar 16, 2010
i have a gridview binded to a database(MySql), with a column ID.now what i want is that when some clicks that ID(Unique) the data corresponding to that ID should be displayed in individual textboxes.
ie
1 Alok 25 9899898989 India
now what i want is if someone clicks 1 then all data should be displayed in databoxes assigned to all fields.
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Jul 5, 2010
How to pass the selected detailsview/formview record data to the second webform and populate in the textboxes present in the second web form using c# code or from aspx page?
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Jul 20, 2010
I have a page with textboxes and a button. I would like to dynamically load the textboxes with data that is in a detailsview on a page load or detailsview load. For example, ID, first name, last name. I find out how to do this on another page with a selected_indexchanged event with a gridview. See the code below. I'd like to be able to do the same thing but with a detailsview in the detailsview_load event.
Protected Sub GridView1_SelectedIndexChanged(ByVal sender As Object, ByVal e As System.EventArgs) Handles GridView1.SelectedIndexChanged txtPK.Text = GridView1.Rows(GridView1.SelectedIndex).Cells(1).Text
txtFirstName.Text = GridView1.Rows(GridView1.SelectedIndex).Cells(2).Text txtLastName.Text = GridView1.Rows(GridView1.SelectedIndex).Cells(3).Text
End Sub
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Dec 15, 2010
I am trying to create a page that will display data from a database after a search action by the user. So i currently have a textbox and button to perform the search function...then i want the data fetched to be displayed on several texboxes on the page (say there are 5 texboxes that I need to populate).how this can be done? Here is the code that I have come up with so far. I am stuck in trying to figure out how to bind the data to the textboxes. I also have my connection string in my config file and I have that code below as well..
[Code]....
[Code]....
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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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May 26, 2010
I hv a gridview in my page, and is getting populated on page load in code behind page ..now i want that, when the page gets load the first row should be selected and the all the values of the row should be get visible in the textboxes above the gridview
i sm hw got the default first row selected but the values of that row is not gettign diplayed in the textboxes.
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