C# - Dynamic Grid View Loses Binding When Post Back Occurs
Sep 8, 2010
dynamic grid view loses binding when post back occurs ?
I have a dynamic grid View with template fields and bound fields as columns
for the first page load all binding looks fine.values are populated in all columns
when I trigger an event such as selected index changed in Drop downlist present in the column header(inside template field ) the binding are lost and the event is never catched.
how to retain controls when post back occurs and how to resolve this problem ?
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Mar 31, 2010
i am creating gridview with dynamic template, and the grid is disappear while postback. my code is below.
i am using GridViewTemplate class to generate Templates
Public Class GridViewTemplate
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Jan 6, 2011
i have 10 list boxes in my aspx page for all 10 list boxes same function is using for some buttons i want to add listbox data to grid can you java script code shown below
f[code]....
i tried a javascript above code to move items between listbox using html input button problem when i trying to save listbox.items.count giving 0 can anyone tell me why this happening and also when post back occurs listbox items lost.
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Jul 25, 2010
I have a /Register [GET] Action in the controller that pre-poluates a view-model with a string and an integer and returns: return View(myModel);I can see the string being populated in the textarea and the id being populated in a hidden input. Yet when the form gets POSTed, the string value is null and the int value is 0. I verified that both values are posted to the server but the model received in the POST action is missing those values.
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Sep 29, 2010
I have a page that is mostly dynamically built in the page load of my VB.net code behind page.
The issue is that I made a change to the page and added a button that redirects to a secondary page. When the button is clicked there is a very noticeable lag until the button click event fires because the page is being rebuilt every time.
I had not wrapped the code in the load event in the If not ispostback.... because I have dynamic controls that the user interacts with and I need the page to be rebuilt when the user clicks them.
The dynamic controls are clickable table cells. I did some looking and I found that the RegisterPostBackControl. I thought this would be perfect but, it does not although I maybe using it incorrectly.
Here is the code flow.
[code]....
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Sep 9, 2010
watch here:
- Create a gridview with AllowPaging and AllowSorting = true
- On page load, I bind it to datasource (in my case a webservice)
- On gridview's rowcreated event, I dynamically add image buttons on the header of the grid for sorting (up/down arrows). On header I have column name and the image. I removed the Column name default sorting link. So user can now only click the image button for sorting.
- Call sorting method
This works perfectly fine without AJAX. The paging, sorting works fine. Also when I apply AJAX the paging works fine. But the sorting is doing a full post back instead of partial postback.
I have my gridview within UpdatePanel and Triggeres is set on gridview sill it doesn't work.
[Code]....
Code Behind:
[Code]....
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Jan 4, 2010
I have the following code
Imports System.Data
Partial Class Students_AddWishes
Inherits System.Web.UI.Page
Public dt As New DataTable
Protected Sub Page_Load(ByVal sender As Object, ByVal e As System.EventArgs) Handles Me.Load
dt.Columns.Add("ID", System.Type.GetType("System.Int32"))
dt.Columns.Add("univirsity", System.Type.GetType("System.Int32"))
dt.Columns.Add("major", System.Type.GetType("System.Int32"))
End Sub
Protected Sub btnAdd_Click(ByVal sender As Object, ByVal e As System.EventArgs) Handles btnAdd.Click
Dim row1 As DataRow = dt.NewRow()
row1("ID") = dt.Rows.Count + 1
row1("univirsity") = ddlUnivs.SelectedValue
row1("major") = ddlMajors.SelectedValue
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GridView1.DataSource = dt
GridView1.DataBind()
End Sub
End Class
the problem is it shows only one row or record. How to make it shows many records?
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Apr 15, 2010
[Code]....
What I want to achieve is the ID of the property: item.Item.ID to be bound to the ID from the (route)URL. However I can't get it to work. I tried using [Bind()] attribute.
I fixed it now using a hidden field in the form like so:
<%= Html.HiddenFor(model => model.Item.ID)%>
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Nov 30, 2010
I have four textbox and a button in my page. After filling the textbox. When the user click save button. A loading image should be displayed. User should not feel that the page is postback to the server,Some thing like in facebook loading image.
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Jul 14, 2010
Being new to ASP.NET I have run into trouble building my own Whack-a-mole program. I think my problem comes from using Buttons, which by themselves send post backs to the server, making the software unusable. The looks are in place, making new buttons show up in the grid, in different places by random. However, when a button is pushed - the score doesn't change (which I feel is strange).
Not so strange is that the Button doesn't work since it sends post back to the server - reloading the UpdatePanel. I think I should use a different controller like the CheckBox and style it hard using CSS (which isn't a problem). Is this the correct way to go, or should I make use of JavaScript AJAX instead?
Note to self: This technique shouldn't be used in a public application since it put too much unwanted pressure on the web server.
[code]...
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Nov 17, 2010
If the grid column is clicked to sort i dont want to retireve data agian, i can get it from viewstate, but i dont know if that triggered the post back or if the ImageButton on the page triggered it
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Jun 22, 2010
What exactly is the e.Row.DataItem return.. MSDN says.. returns An Object that represents the underlying data object to which the GridViewRow object is bound.
Here is my DataGrid...
<asp:GridView ID="GridView1" runat="server" AutoGenerateColumns="False" DataSourceID="ObjectDataSource1" OnRowDataBound="GridView1_RowDataBound">
<Columns>
<asp:BoundField DataField="PracticeCode" HeaderText="PracticeCode"
[Code]....
Note : There could be other ways to accomplish this, but I'm looking especially why my p1 is null... and is there any way to get the Patient Object back from GridView after binding.
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Mar 23, 2010
I have an ASP page which displays a text box when it loads. It takes an input number, send it to the server through post back, and then displays some record in a grid view. After a number is input into the box, the server fetches some data from a database and add records to the grid view. It also contains a link column, whose URL is set to "#", so that the page isn't redirected when it is clicked.
Now I want to bind a jquery "click" event to that link. How can I do that ? I have tried that to do myself but failed, because it is not available when the DOM is loaded (since it only contains rows when a number is input through the box), and is being modified through ASP.NET Ajax post back.
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Feb 14, 2010
I have 3 drop downs in a details view (populated from a gridview) during insert mode.
Dropdown 1
Dropdown 2 --> Based on drop down one
Dropdown 3 --> Based on drop down two
I am curious of how to handle the autopostback to update 2 and 3 since they are part of the detailsview, there isn't a selected_index_changed event.
I am ok with adding items to them on page load, just not for cascading of them...
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Mar 23, 2011
the code is like,
namespace DataControlsSample.App_Code.PL
{
public partial class GridView : System.Web.UI.Page
{
protected void Page_Load(object sender, EventArgs e)
{
[Code]....
the data table is getting rows ,as i had chked ,,,but grid view is not getting displayed ..wat could be the problem?
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Dec 8, 2010
I have an gridview consisting pager Templet. In pager templet, add first, previous,next and last Buttons to control records. PageSize is 3. First I am binding first 3 records from the list (Consisting 9 records) to the GridView.
My question is:
<1> Is it possible to bind the next 3 records(record4, record5,record6) to GridView when click on next Button?
<2> Similally, Is it possible to bind records for other buttons?
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Jan 10, 2011
I have a parent control that has an instance of a HiddenField child control. I am using CreateChildControls() to add it. Everything works client side including the values being added to the field. However, on postback, the reference to the field is null
here is the code
[code]....
I have tried simply relying on the ViewState ... then also attempted using FindControl(). Neither works, it comes up as a null reference ... any input on what is going here?
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Mar 11, 2010
as we all know
Dataset ds=new DataSet();
gridview1.datasource=ds;
when the dataset has no reccrds then the grid view will not displayed.
I need to show the grid with 10 rows with no details means empty records.
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Jun 8, 2010
I am developing an application in C# and Sql Server.
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I have to bind OData feed, which is a response from WCF Data Service, to a gridview. The structure is as follows:
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[Code]....
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I have no clue what I'm doing wrong here, but I wanted to create a grid view based on a return from a tableadapter.
[Code]....
[Code]....
Also, maybe I should be going about this another way as I wanted to add a drop down to each record and a link to each record.On pointers on how I should do this would be great too.
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Sep 7, 2010
how to create a dynamic grid view and a drop down box in its header ?
where should this be called like in page load ?
where should the events be handled ?
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Feb 26, 2010
I have a grid view which I am binding it through my .cs file code:
I need to hide a column, From the Below code I am able to hide the column but not the header and footer design.
So how can I hide my column when I dont have any columns in my gridview (I mean in .ASPX page)
MyCode:
[Code]....
.cs Code:
protected void Row_Grid(Object sender, GridViewRowEventArgs e)
{
if (e.Row.RowType == DataControlRowType.DataRow)
{
e.Row.Cells[9].Visible = false;
}
}
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Mar 29, 2010
I have gridview control where i have added two templates one template is the dropdown box another one is the text box.
I have common controls (Edit,update,cancel)
In the form i have one button .
On click on the button one new row is created in the grid view
Now how do i fetch the data entered in the dropdown box and the textbox.
How to reload the updated data to the dropdownbox,textbox.
On edit(twice) click it is switching to Update and cancel mode
On Cancel(twice) click it is switching to Edit mode.
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Jan 28, 2011
I am working on the dynamic grid view(create dynamic columns).I need some thing like that given bellow in the fig:
columns1,2,3 are dynamic and the modules under the columns are also dynamic. to create grid like that.
Column1
Column2
Column3
Module1
Module2
Module3
Module4
Module5
Module6
Module7
Module8
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