AJAX :: Binding A ListView Without A Postback?
Nov 24, 2010
I have a ListView that does quite a heavy query. I don't want the user to have to wait half a second to a second for the page to load. I would much rather have the page load, display the theme and then have ajax make a call to the server to run the query and bind the listview while a loading icon is displayed.
The only thing i can think of is to use the sys.application.init handler to add some javascript that calls dopostback and passes a command name. I dunno... any thoughts? Anyone do this with aspnet/ajax with update panel? I guess im trying to bind an update panel without requiring a user clicking a button.
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Aug 26, 2010
I am having trouble finding how to solve the following issue :
I am using nested listviews to display Sales and Sales details.
The main ListView displays General Information about Sales and the child ListView displays the detailed information about one sale. the child listview is shown only when the user clicks on a link (see included code, DataBind is made on PageLoad) :
ASPX Markup Code :
[Code]....
C# Behind Code :
[Code]....
If I removed the datapager part, I can manage show/hide the child list view on the button click event. but if I want to use the DataPager with the PreRender event handling, the child listview is not longer shown on button click.
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Jun 2, 2010
Listview and objectdatasource binding?
[URL]
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Jul 1, 2010
I have a class that returns a list of "Category" Objects. I'd like to display them along the left-hand side of the page in a listview (if that's the best way to do it, even).
The category objects have normal attributes. Title, User, NumberOfProjects. I'd like to display both the title and the number of projects in this list.
Not worried about editability right now as we might make that separate (i.e. not in-line in a list view edit mode).
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Aug 3, 2010
is it possible to do something like this: Having a listview in my web form to calculate employee's salary, just about around 1000 employees at a time, but due to many conditions to calculate one's salary, the page cost too much time to load the data (about 25s-30s), now it's just nearly 100 employee, but if about the above number of employee (and it will be even more in the future), it will be unbelievable slow,
so I think of a solution like this, the page still load but it just calculate 20 employees at a time and bind it to the listview so the user can see some data to not see it's too too slow to load the page, and after that the page still loading to calculate the rest and bind data to the listview again and now it is 20 + 20 +........ = 40, 60 rows....... (the listview won't reload it just add new rows) I remembered that I saw something like this in Bing.com when load the image searching, and some asp.net gridview have the exact ability as Bing, the grid/lisview load data when user scroll down, but now I can't remember the link and the key words to search for it.
I used LINQ to retrieve data, I did compiled query, and some tweaks to improve performance already, yes, it so much faster than the first time but it still so slow after all.
Note: I have read about loading content while scrolling or scrolling continuous but it not load all the data one by one and bind the data to the listview, it just continue to load the data when user scrolling down and there is no end to it.
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Mar 7, 2011
I have a ListView with an ItemTemplate item as below:
<asp:Label runat="server" ID="lblChangeOrders"><%#Eval("sum")%></asp:Label>
What I need is if the sum is negative I need to set font color as RED and remove the minus sign.
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Jan 20, 2010
I have a list view with a label that shows "Step #x", another label with the instructions, and then 2 linkbuttons for editing or deleting. At the footer of the ListView is another button "Add New Step" which opens up an empty TextBox and two buttons to save and cancel. I would also like it to increment the label, but I can seem to find the control in the code behind to change it's text. How do I do this?
Here's the asp markup:
<asp:ListView ID="lvSteps" runat="server" DataSourceID="ldsProcessStep" DataKeyNames="ID" InsertItemPosition="None">
<LayoutTemplate>
<div><asp:PlaceHolder ID="itemPlaceholder" runat="server" /></div>
[Code].....
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Apr 22, 2010
I have a function that constructs a datatable from a file that the client uploads. And I want to bind that datatable to a listview but I'm not sure what I'm doing wrong... Say, the datatable is like:
FirstName LastName
John Smith
Here's how my aspx looks like:
[Code]....
In my names.aspx.cs file, I do: lvNames.Datasource = dt; //dt is a datatable
lvNames.DataBind();
When I run my aspx page, the listview is empty, is there something obvious I'm doing wrong?
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May 31, 2010
i have one ajax accordion control and inside that i have a list view inside that control. now listview is bind to objectdatasourcecontrol.
and object data soruce control is bind to a custom class. Now the problem is that i need to naviagate to different pages on the click of the listview items or load user control...Now how to do that?. i am pasting my code here.
[Code]....
and class file which is bind to objectdatasource control
[Code]....
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Jun 20, 2010
I'm using a listview control to show a list of categories/subcategories
<%# Eval("SubCategory1")%> When the user clicks the SubCategory1 link, the list view should fill up with the next subcategory, SubCategory2. The problem is off course that <%# Eval("SubCategory1")%> is hard-coded. I need it to change to <%# Eval("SubCategory2")%>...and so on, as the user is drilling down into the sub-categories.
So is there a way to change <%# Eval("SubCategory1")%> dynamically?
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Oct 4, 2010
I have added a ListView to a web form and this code works when the data columns in the bound dataset have values:
<asp:ListView ID="picturesListView" runat="server"
GroupPlaceholderID="groupsGoHere"
ItemPlaceholderID="itemsGoHere"
[code]...
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Mar 22, 2010
I have a datasource that is connected to a stored procedure and I need to do a postback on the web page but do not want the sqldatasource to do a databind. What I am doing is when I change a dropdown box to fill in some textboxes with specific dates, I do this on a postback so the textboxes are filled in with the dates. But the SQLDatasource control data binds again and shows new results in my gridview.
Is there any way to prevent this so I can just postback to fill in the textboxes?
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Jul 13, 2012
i want bind the data from database in grid view when each text enterd in text box.any possible to do that without post back?For example i bind the customer details from customer table in grid view when i enter the customer name in textbox to search particular customer the grid view show only the particular customer details without postback
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Jun 16, 2010
I don't know what I'm doing wrong but for some reason I'm not able to maintain the index selected value on the listview that I've created within a user control. In a user control I have added a listview. I have exposed the handler, Datasource and DataKeyName. I have populated the datasource of the listview by using the following:
MYLIstView.aspx.cs - user control
[Code]....
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Mar 10, 2011
I have a Formview that is bound to an SQL database, and in its item template I have added an image button.
That image button on selection needs to postback a primary key Value (VoucherID) to be used in a second control on the same page. In VWD I can get it to post back but I can't get it to post back with the VoucherID parameter.
I can easily get it to send a querystring parameter, but I don't want to do it this way.
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Mar 5, 2010
I'm using VS2008. When a dataset is bound to the DataSource of a ListView, SelectedIndexChanged event does not fire. If I used DataSourceID instead, it has no problem. But SelectedIndexChanging event fires for both.
why and how I can get SelectedIndexChanged event fired when DataSource is used?
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May 31, 2010
I have a ListView1 control that his <ItemTempleae> has a another ListView2. ListView2 is surrounded by <UpdatePanel> with trigger and also UpdateMode="Conditional". But, I don't know why ListView2 is not being update as it should, I need to refresh all the page to see the new data enter to ListView2 only. What is the problem? How can it be fixed? I think that the problem is something in the structure. There are about 10 ListView2 with updatepanel surronded them, so when I am looking to update a specific ListView2, it doesn't know which one to update because there are lots of them. What to do in order to solve that problem?
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Jan 25, 2011
I have a linkbutton to which i am binding to the click event using jQuery, however the page still posts back no matter what i try...
According to this i should be able to use event.preventDefault However nothing seems to work and it always posts back, but i do get the alert
Here is my example
<asp:LinkButton runat="server" Text="TEST" ID="lnkTest"></asp:LinkButton>
<script>
$(document).ready(function () {
var lnk = $('#<%=this.lnkTest.ClientID %>');
lnk.unbind('click.test').bind('click.test', function (event) { alert("Click"); event.preventDefault(); event.stopPropagation(); return false; });
});
</script>
UPDATE
Okay after some further investigation it seems that this does work as expected when i run it in a standalone page, however we are using this script, and it appears that it is causing a conflict..
That script moves any href='javascript:... into the click handler, im guessing that the order the handlers are assigned may have something to do with it...
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Jul 28, 2010
I have UserControl and within that control i have asp:ListView. Inside the ListView i have a asp:LinkButton. When i click on the LinkButton the control raises full postback, no matter if the UserControl is inside UpdatePanel or is not.
UserControl:
<asp:ListView ID="lvImages" runat="server" OnItemCommand="lvImages_ItemCommand">
<ItemTemplate>
<div>
<asp:Image runat="server" ID="imgImageThumb" ImageUrl='<%#Eval("Image") %>' GenerateEmptyAlternateText="true" />
<asp:LinkButton runat="server" ID="lbtnImageAdd" CommandName="Add" CommandArgument='<%#Container.DisplayIndex %>'
CausesValidation="false" Text="Add" />
</div>
<ItemTemplate>
</asp:ListView>
Page:
<asp:UpdatePanel ID="up" runat="server">
<ContentTemplate>
<cuc:UserControl ID="cucUserControl" runat=server/>
</ContentTemplate>
</asp:UpdatePanel>
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Jan 15, 2010
I am currently working on a page that displays a set of questions as retrieved from an XML source. I can print the questions out fine by using a ListView and the ItemDataBound event. On PostBack it seems I can get some property values (Text), but not others (ID). I need to get the ID so I can match up the answer to the appropriate question.
Here is the ListView:
[Code]....
I just don't understand the Life Cycle stuff that well for advanced issues like this. I'd prefer not to use the Request.Form collection for this, but I will if it's the last resort.
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Jul 13, 2010
I have an aspx page with the following controls:
2 DropDown lists
1 ListView
1 FormView
The procedure is as follows:
STEP 1:
One selects items from the dropdown lists and click the Search button.
The ListView displays all the entries that match the criteria.
STEP 2:
Each entry in the ListView is clickable to select more details in the FormView.
Everything works perfectly well. However I'm testing the selected values after each postback based on the following script:
[Code]....
Now after STEP 1 (Search button) I get the selected ddl values. GREAT so far.
However in STEP 2 and in order to get the selected value of theListView I have to click twice on the same entry in the ListView. The ListView1.SelectedValue is returning 0 after the first click. The correct value is displayed after the second click.
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Oct 15, 2010
When an asynchronous postback happened inside update panel, another postback happens also for MasterPagenot only update panel embedded page .I want to prevent this MasterPage postback . is this possible ?think like i have a MasterPage and another page which is test.aspx which is content page of MasterPagei have update panel at test.aspxwhen asynchronous postback happens at this test.aspx update panel it also loads
MasterPage Page_Loadi want to prevent this (it should not also load MasterPage Page_Load)
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Jan 28, 2010
I'm doing research on framework development for my company. SInce I will be developing a framework I can not simply declaire all my control in the code in front. Receiently I've been having trouble binding the controls from my ListView to my ObjectData Source. Basicly the properties in my DataObjectTypeName are not populated when the ObjectDataSource "Update" command is thrown. I recieve no error, I just get null values. All I need is an equivalent to this statement for code-behind ...
<%# Bind("AbstractText") %>This would solve all my issues. Ofcouse I will most likely need to bind the control's ID somewhere but that is not an issue. How do I Bind a control to a property in my DataObjectTypeName from the code-behind?
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Apr 6, 2010
I have a DataGrid bound to an ObjectDataSource, as you know once the DataSourceID on DataGrid is set, data binding happen automatically without any coding. But due to requests from end users, I need to prevent the data binding when the page is loaded the first time, i.e. data binding should only happen during PostBack. How do I do that?
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Jun 15, 2010
In an vwd2005 aspx page, I have a formview, dropdownlist and 2 sqldatasources. My markup is below
[Code]....
When the dropdownlist causes the postback, the formview does not display the data (it's there, I've double checked using query analyzer). Also, the OnIndexChanged only makes a button visible and has nothing to do with the data. What am I missing?
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