Web Forms :: Binding Data Just Few At A Time To The ListView?
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.
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?
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?
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:
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?
Suppose I have a horizontally oriented ListView that always shows 4 items and also has a left & a right button: < A B C D >
Now, let's say I have a DataTable containing 20 entries, with indices ranging from 0 to 19.
When the page first loads, this is what'll be displayed: < 0 1 2 3 >
Assuming those buttons are regularly configured DataPage buttons then if I press the right one we'll get this: < 4 5 6 7 >
And if I press the right one again we'll get this: < 8 9 10 11 >
But suppose I'd like the left & right buttons to only scroll one at a time, so that pressing the right one at the start results in this: < 1 2 3 4 >
In such a case, is there a way to configure the DataPager to do this or should I instead introduce regular buttons and perhaps have them call a hidden DataPager?
When (in what event) is the best time to set PageSize for the ListView's DataPager? I have tried every event on the ListView and either it does not work (i.e., reverts to the default 10) or I get a CRASH of some sort (mostly error 12002) - but that's a different story.
I have a ListView that populates and displays a user's data (via a profile system in VWD 2008) during Page_Load and also when I go from the EditItemTemplate to the ItemTemplate. Then when I go to the edit screen again, my DropDownList and RadioButtonList controls display the first items in the corresponding tables instead of the correct profile values. I don't understand why the controls populate correctly the first and second times but not on the third time (that's right, the third time is NOT a charm).
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?
I have a ListView that populates and displays a user's data (via a profile system in VWD 2008) during Page_Load and also when I go from the EditItemTemplate to the ItemTemplate.
When I go to the edit screen again, my DropDownList and RadioButtonList controls display the first items in the corresponding tables instead of the correct profile values.
I don't understand why the controls populate correctly the first and second times but not on the third time (that's right, the third time is NOT a charm).
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.
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).
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?
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
I am simply trying to change the listView template based on a value in the listview data. I do have this displaying the information correctly. Except when I try to change the item template based on a value in the listview. My code is below ....
I have a ListView, I've setup to use an ObjectDataSource, I've created my Layout and Item templates, and I'm able pull and view a list of my data no problem. However I want to add delete capabilities to my ListView and my reference material tells me to go into the "Configure ListView..." option under the ListView's smart tag, the only problem is I don't have that option, the only three options in my smart tag are "Choose DataSource", "Configure DataSource..." and "Refresh Schema", what am I doing wrong?
I have anested ListView control. I also implemented a jQuery to automatically expand the TextBox control inside of the nested ListView Insert Template. The problem is, when the Textbox expand, the outer ListView control is not; therefore, the Textbox control expands underneath the buttons of the outer listView control. How do I expand the outer ListView control as the nested ListView textbox is automatically expand? One great example is in Facebook where if I add a response comment, it'll automatically push any comments below mine down. If nested Listview control is not the best way to do this, what are my options?
Does anyone have an example for how to create a Dynamically Templated Listview with prefernces page to specify which columns & column order)? Also the listview would also have Edit, delete and insert options if possible. And uses the n-tier approach with Bus Layer and does NOT use LINQ.
Is there any way to enable alternative ListView (LV2) or any other control in case when ListView (LV1) returns no records from DB? I already have emptydatatamplate designed for this case, but I need to enable a new ListView below in this particular case and I don't know how to achieve this!
I try to datbind a listview which is inside another listview InsertItemTemplate.
[Code]....
I'm binding the listivew in the parent listview onitemcreated events. I receive the error Databinding methods such as Eval(), XPath(), and Bind() can only be used in the context of a databound control.
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.
