Forms Data Controls :: Gridview Datasource Canceled After Postback?
Aug 17, 2010
I have a GridView inside an UpdatePanel in which there is a TemplateField column. I need to save the value of this column every time a user changes it. The problem is that when the TextChanged event causes a postback, the GridView datasource is set to nothing. I've noticed that this happens every time there's a postback. Why?
Here is the code:
[CODE]
<%@ Page Language="VB" AutoEventWireup="false" CodeFile="Prova.aspx.vb" Inherits="Prova" %>
View 2 Replies
Similar Messages:
May 10, 2010
In asp I want to add row to my gridview when I read barcode. But when I want to add second row , gridview.datasource = null. So, my first row is removed from gridview in TxtBxBarcode_TextChanged event.
TxtBxBarcode and gridview are in the different update panels.
How can I prevent this "gridview.datasource is null when Postback" ?
View 4 Replies
Feb 1, 2010
I am using a list of objects as a datasource and passing the object into a user control. I use the code outlined below
[code]...
When I try to access the object this way, it's null.
Funny thing, I can access the user control and all the control data in the user control, but the object (both in the gridview and passed to the user control) are null.
View 1 Replies
Jan 10, 2011
I'm trying to extend the GridView control to enable sorting and paging for any situation.
When using my control I am fetching data from a database and filling a DataSet with it, then binding the GridView upon every page load. My first question would be, is this the correct approach?
To sort the GridView I am overriding the OnSorting method which stores the sort expression and direction in the ViewState, then creates a DataView and utalises the Sort method to sort the underlying data. It then sets the Data Source to this DataView and rebinds the GridView.
Paging is handled by OnPageIndexChanging which simply sets the PageIndex property and again rebinds the GridView.
My problem is; when any control causes a postback my GridView is no longer sorted, presumably because it is persistently rebound. If I don't rebind it then the GridView is empty on postback since the data isn't automatically stored in the ViewState. I have considered saving the data source in the ViewState but I would assume that this is bad practice for large amounts of data? - also DataViews are not seralisable.
The only solution I can think of currently is to override OnDataBound and sort the data every time. This results in a double sort when paging triggers a postback which seems inefficient. Code illustration of this below,
[Code]....
I'm looking for the cleanest 'best practice' solution as this is a learning exercise more than anything else.
View 12 Replies
Feb 11, 2010
I have a gridview that I only want to show if the page is a postback. I'm not a very good programmer. show me some VB code that will assist this. I think I want to use a page load event and IF NOT Postback then visible = false for my gridview but I don't know how to write it out...
View 4 Replies
Nov 3, 2010
i have a global field called hotelId. i then have this piece of code that gets a value from gridview row:
[Code]....
the local variable is assigned to my global one, which gets passed to my method along with other variables. while stepping through i can see the value is set, but when i hit the submit button variabl is passed to another method except my hoteId. it gets lost...
View 3 Replies
Feb 9, 2011
I design a page which contains one dropdownlist, gridview1 and gridview2. All of them extract data from the same table (a SqlDataSource). The Gridview1 is used to edit, update data with edit, update and cancel button. My problems are:
1. After update gridview1, the dropdownlist and gridview2 don't update data.
2.After updata gridview1, the gridview1 resets to its original state if refresh page.
View 4 Replies
Feb 23, 2010
I have a gridview which is ShowSelectButton = "False"
I use
e.Row.Attributes.Add("onclick", Page.ClientScript.GetPostBackEventReference(sender, "Select$" & e.Row.RowIndex.ToString))
to select a gridviewrow but it causes a postback whenever I select a row. Is there a way to allow selecting a gridview row which will not cause a postback??
View 1 Replies
Nov 1, 2010
I am trying to create a form that displays a dropdown and a password. The dropdown will act as the login for the password. If the password is correct the dropdown should be the variable for a gridview that should be visible? Can someone look at my code and see where I may be going wrong or any hints?
ASP Code
[Code]....
c#
[Code]....
View 2 Replies
Apr 8, 2010
I've got a GridView on my page which has some bound controls, one of which is a label (to display total price):
[Code]....
However this value is not being passed to my page. All I see is '£' symbol, no price which makes me think Viewstate["youpay"] is empty? I have enabled viewstate on the Page and Control tags.
View 3 Replies
Jan 13, 2010
I have a gridview where in the users are allowed to edit certain data and there is an update on top of the page which will send out all the changes made inside the GridView. But, the problem is , as soon as the update button is clicked, the grid disappearsand no update is made. This problem occurs when the size of the data on the page is huge. When we have less amount of data on the gridview, It does update. But, when there is a huge amount of data on the gridview, it does not. We have tried to increase the page size on the server, but to no use.
View 3 Replies
Apr 23, 2010
I am have a page with a couple of dropdowns which serve as criteria for a select SPROC. Once a selection is made in a drop down a panel is shown which contains gridview whose rows have been returned by the select SPROC.If you close the panel and change the drop down selection and then redsplay your panel the data from your prior selection is still displayed in the gridview,
unless you page to the next group of records.
View 2 Replies
Jan 5, 2011
I have a c# code that put some background color in cells according with some values, the problem is that each time I add a button or a postback occurs I lost all colors (and other attribs).So my workaround in call the function that fills the gridview each time... but this produce a slow performance.
View 4 Replies
Oct 5, 2010
I have a grid view whose 1st column is Image Field. Now I assign 1 out of 4 images to each row at runtime. I have this gridview in ajax updatepanel. Now how can i persist the images in the first column after a postback.
View 6 Replies
Oct 18, 2010
Im binding the gridview in page load.After i click the link button in the gridview it displays another gridview.I have a checkbox in that gridview.I check some of the checkboxes.while i click the save button i want to get that checkbox state whether its checked or not.Bt for me its showing no records in the grid.How do i persist my data and get the checbox's state.
View 3 Replies
Aug 16, 2010
I have a GridView on a web form, which displays data fetch from database using Linq. When I update the GridView in a button event on server side everything works fine. Now I want to update the GridView from a JavaScript funciton call. Here is the code on the page.
[Code]....
And here is the code behide
protected void Buttons_Click(object sender, EventArgs e)
[Code]....
The problem is that GridView1 never gets updated in IE. It works perfectly in Firefox. I can see the event was triggered by the Javascirpt call and I get correct dataset from database through debug. However the GridView never display the correct data. Is GridView handled different from regular web form control?
View 3 Replies
Jan 8, 2010
I have a Gridview inside and UpdatePanel, Rows in this Gridview contains a DropDownsLists, each row has this attribute:
€œe.Row.Attributes["onclick"] = ClientScript.GetPostBackClientHyperlink(this.GridViewPJ, "Select$" + e.Row.RowIndex);", to select rows on mouse click.
If i click on the dropDownlist Contained by the row, this algo launch a postback, so I can never see this DropDownList deployed.I need a Way to stop this postback. Is teher a solution for this?
View 1 Replies
Feb 7, 2011
I ahve displayed a group of data in my gridvew with the edit option linkbutton template field for each row. The gridview columns consist of employee name and projectname and total hours field employee worked.
So in this when i click the edit button using the datakeynames alue for project name id and employee id ,i have to redirect the page to another page with the values in the grid for the particular employee.so that i can update the totalhours field in the redirected page.and if i press the update button in that page then the page should be redirected to the gridview page with the updated value for the particular employee and project. The page which should be redirected consist of project name dropdownlist, module field,date field and total hours field. No employee name field.
Using the gridview rowdatabound field i have postbacked the url page with the project name id but it does not displays the project in the redirected page.And employee name i have to redirect with the session value i think?
View 6 Replies
Dec 17, 2010
I am having an issue with the gridview in ASP.NET. Everything works well when running from IDE in both debug and without debug. When I publish to IIS I have a gridview that I use in two places. It works fine in one place but not the other. In one instance I am using an IFRAME tag to display the page that uses this data grid. When I first load it it works fine, I can click on a row. But after clicking on that row after the first postback, I can no longer get it to postback again on future clicks. I used firefly and after clicking the first time on the grid, the tags for the table are not rendered though I can clearly see the grid. Confused... Here is the rendered code before clicking on it using firefly. (oh yea, this gridview is also inside of an updatePanel) (In the below I replaced actual data with xxxx)
[Code]....
Below is the code after clicking on the grid.
<div id="UpdatePanel1">
<div style="background-color: white; width: 818px; height: 405px; overflow: auto" onscroll="GetScroll()" id="divFill">
<div style="padding-bottom: 5px; background-color: buttonface; width: 818px; height: 20px; padding-top: 5px" id="NavFoot" align="right">
</div>
Also, if I did not provide enough information let me know.
View 3 Replies
Feb 23, 2010
I've got a Gridview in which I use the RowDataBound handler to color the lines according to certain conditions
(ie if column x is value y then change the background-color of the row to z etc).
One problem though, as soon as I do a postback the coloring disappears altogether and all rows become white.
Is there some way around this so I can retain my background colors even after a postback?
View 14 Replies
Jan 21, 2011
I have problems with gridview that has command button in it. The command button (when clicked) should redirect to another web page, but instead of doing it only does postback on current page.
.aspx file
[Code]....
.cs file
[Code]....
View 5 Replies
Nov 2, 2010
I'm using ClientScript.GetPostBackClientHyperlink in the OnRowCreated event of the GridView to postback when you select a row. I put a column of checkboxes in now and when 1 or many checkboxes in the row are selected I don't want the page to postback. I'm having trouble with this.This is my code:
[Code]....
View 2 Replies
Jun 1, 2010
I have a datarepeater inside which I load a gridview. After the grid's binding is done I create an extra header line to group the columns (that's the only way I could do it, I couldn't figure a way to add an event for a control inside the repeater).That works fine and the page displays perfectly.However everytime I do a postback from other controls, I lose the 2nd header and 1 extra empty line appears at the top of the gridview
View 5 Replies
Jan 24, 2011
I have a gridview with a dropdownlist in one to the headers. So on the onselect event of the dropdownlist I want to change the assigned values of itemTemplate values inside one of the columns.
View 1 Replies
May 4, 2010
have an ASP.net 4.0 page containing a GridView, where during the Page_Init event I'm dynamically adding BoundField columns to the gridview. I also have some custom sorting and paging methods that I use with this gridview, which result in postbacks on the page. In Chrome, Firefox, Safari, and Opera the gridview behaves as expected. HOWEVER, in IE 6, 7, or 8 when I click to sort a column in the gridview, or go to the next page of results in the gridview, it does not bind on postback, returning nothing back to the browser. Again, in anything but Internet Explorer, paging and sorting (frankly any postback event) brings back the gridview in its expected state. I only have the problem in IE. Relevant snippets of my code follow, where you'll see my Page_Init event calling a method in my WebFunctions class to add the BoundField columns for the table I pass to it, and my Page_Load event that calls the method in the user control responsible for binding my dataset to the gridview. Initial page load works in all browsers, but postback loading of the gridview only works in non-IE browsers.
[Code]....
View 4 Replies
