For more ASP.NET MVC visit www.devexpress.com/mvc Learn how you can setup inline editing with the DevExpress MVC GridView Extension. We'll also cover the Popup edit form and custom edit form templates. A Multipart Series on ASP.NET's ListView and DataPager Controls; This article is one in a series of articles on ASP.NET's ListView and DataPager controls, which were introduced with ASP.NET version 3.5. Displaying Data with. The ASP.NET data binding model underwent a significant refresh with version 2.0, mostly due to the introduction of data source controls and data binding expressions. These two families of components provide ASP.NET with a. Check the tutorials for ASP.NET ListView, explore the advanced features of RadListView: data editing, paging, sorting and grouping and handling events.
How to Use ASP. NET 3. List. View & Data. Pager. ASP. NET 3. List. View & Data.
Pager . List. View Web server control enables us to. Data. Pager is attached then it. List. View. List. View is a data bound control similar to. Data. List and Data. Repeater controls but it provides edit, insert, and.
NET 3.5 introduced two new data bound controls ListView & DataPager. ListView Web server control enables us to display the data from a data source and if a DataPager is attached then it enables paging in the ListView. We will use the buttons to show each ListView's content. If you do not have any pictures that you can use, I am including my pictures I have used both small and large versions of the Zodiac signs. The ASP.NET AJAX Control Toolkit provides the MaskedEdit control and the MaskedEditValidator control which work together to prompt, style, and validate the data that the user enters in a text box. This allows the Web page.
- In ASP.NET 3.5, Microsoft introduced two new databound controls: the ListView and DataPager control which you can use to display and paginate your data in extremely flexible way. In this tutorial I will show you how you can.
- One of the new controls in ASP.NET 3.5 that I think will be very popular is the <asp:ListView> control. The ListView control supports the data editing, insertion, deleting, paging and
Grid. View control. Unlike Grid. View control List. View gives the user full control. Data. Pager Web control is used to. IPageable. Item. Container interface. List. View implements the. IPageable. Item. Container and will use Data.
Pager to support Paging. In this tutorial we will use both the controls to achieve an email Viewer look. Binding List. View to a Data.
Source. We can use any ASP. NET datasource control. List. View control by setting the Data. Source. ID property of the. List. View control to the name of the Datasource control. This sample is using Access.
Data. Source. control to bind to the List. View control.< asp: List. View. ID=. It has a sort event, which can be specified by setting the. Name property of the control, which is part of the List. View control to. the 'Sort'. The Sort event supports command argument which can be used to. The handler for sort event is.
On. Sorting property of the List. View to the. handler name. Specifying the Sort Event on the control's< asp: Link. Buttonrunat=. The templates are: - Layout. Template- Item. Template- Item. Separator. Template- Group. Template- Group. Separator.
Template- Empty. Item. Template- Empty. Data. Template- Selected. Item. Template- Alternating. Item. Template- Edit.
Item. Template- Insert. Item. Template. The display hierarchy of the various templates in List.
View are shown. below. The main layout of a List. View. control is created by defining a Layout. Template. The Layout. Template will. include controls that acts as a placeholder for the data like Table, Panel. Label or HTML controls like table, div, or span elements that have a runat. This template typically contains controls.
These two. templates are mandatory. Group. Template will be used to group the items. The. Edit. Itemtemplate, Selected. Item. Template, Insert. Item. Template are shown at that. It will be specified in Layout.
Template or Group. Template. In order to specify a item placeholder.
ID property to . The item placeholder control. If you want to provide a different ID, you can. Item. Placeholder.
ID attribute of the List. View control. If Grouping is used, Group.
Template will. act as place holder for Item. Template. In this case a Groupplaceholder. List. View. An Groupplaceholder can be specified in. Layout. Template by setting a control's ID property to . We need to use a. Layout. Template> < tableborder=.
Alternatively, the Data. Pager control can be placed inside the data- bound control hierarchy. Data. Pager control will display navigation controls by adding the pager fields to the control. Data. Pager supports. Next. Previous. Pager. Field: Enables to navigate through pages one page at a time, or to jump to the.
It shows first, prev, next, last buttons. The button type may be of Button, Image, Link. Button. Numeric. Pager. Field: enables to navigate through pages by displaying page numbers on the datapager. Template. Pager. Field: we can create.
UI by using Template. Pager. Field. We can use Labels, buttons, images to.
UI as well as programmatic control of the Data. Pager. In order to create the Data. Pager according to the above image we need to use Numeric. Pager. Field as well as.
Template. Pager. Field as part of the Data. Pager Fields. We can use Data. Pager. control's properties like Page.
Size, Total. Row. Count, Start. Row. Index to create the Template. Pager. Field. Page. Size gives the no of the pages currently displayed in Data. Pager. Total. Row. Count is the no of rows presented in the datasource attached to the Data.
Pager. Start. Row. Index is the current first row's index in the data source .< asp: Data. Pagerrunat=. The. ASP. Net. code < %#Eval(. It looks like Data. Pager always select complete data source (it just use data source of List. View). That is not efficient, even not acceptable if you have more than 1.
In that case it is better to select only page you want to show, instead of selecting all rows from large table. Also, Data. Pager works only with List. View. It cannot use Repeater or Data.
New trends in ASP. NET data binding: the List. View control - . NET tutorial. This article was originally published in VSJ, which is now part of Developer Fusion.
These two families of components provide ASP. NET with a declarative model for data fetching and data manipulation. Data source components force layering and promote a neater separation between presentation and data access, even in relatively simple projects. Data source components offer an alternative to the classic ASP. NET binding model based on a programmatic and explicit binding between enumerable data and the Data.
Source property of data- bound controls. For example, the Grid. View control is just a smarter version of the Data. Grid control that, among other little things, fully supports the new data binding model. Designed to render tabular data, the Grid. View is partnered by Details.
View and Form. View that render out the content of a single record at a time. In actual fact, the List. View control fills a gap. There’s no control, in previous versions of ASP.
NET, for iterating data templates for all the records in a data source. ASP. NET provides Repeater and Data. List controls, but they only support data source components for fetching. The List. View control can be considered as an enhanced version of the Data.
List control that fully supports data source components. In this article, I’ll provide a developer’s perspective of the control, and show in action both its obvious and less obvious capabilities and features.
As a developer, you can control any HTML markup that the control outputs, without being bound to any predefined schema such as a form or a grid view. Unlike any other controls in ASP. NET, the List. View is designed to leverage an external component for paging and sorting.
This component is the Data. Pager control added in ASP. NET 3. 5. The List.
View is currently the only control aware of the data pager standard interface. Finally, the List. View lacks the usual dozens of style properties that characterize many ASP. NET controls, but this doesn’t mean you can’t add any style to the output. The output of the List. View control can be styled at leisure but only using CSS style sheets directly on HTML elements and without the intermediation of ASP.
NET themes. Likewise, it supports no header or footer template. The List. View features just one template for the structure of the resulting markup – the layout template. If you need a header or footer, you can easily place them in the layout. At the same time, a unique layout template makes it easier to develop the layout horizontally or in tiles.
The layout template, implemented through the Layout. Template property, is mandatory in any List. View control. The layout template must contain a server- side element that acts as the insertion point for the templates of bound items.
This can be an HTML element decorated with the runat attribute, or an ASP. NET server control. The final output is given by the layout template expanded to contain item and alternating item templates. You do this by using the Item. Placeholder. ID property. At the very minimum, you must indicate content for the Item.
Template property, or the Group. Template property if you’re looking for a tiled output.
In this regard, the List. View control is not different from other ASP. NET data- bound templated controls. To bind to data, you use ASP. NET < %# . In the data expression, you place the Eval method for read- only access, or the Bind method for two- way data binding. The List. View is just perfect to fill in the gaps left by the Grid. View control – the first option whenever you need a tabular layout.
With a List. View control, it is easy to arrange a custom tabular layout where you have, say, two rows per record. Getting the same result with a Grid. View is not trivial. The List. View exposes its overall layout through the Layout. Template property, whereas the Grid. View control hides it entirely and only exposes a collection of Grid. View. Row objects for you to bind and customize.
The listing below shows the markup code for the List. View in Figure 1. If you need to style table elements you can use CSS styles both through the class HTML attribute or a CSS style explicitly associated with a control ID. This string has to match the ID of a placeholder control anywhere in the layout template. It is essential to note that the dynamically generated markup tree is not parented into the placeholder control, but fully replaces it instead.
For example, consider the following markup. As a result, the final markup served to the browser won’t contain a tbody tag. To preserve the tbody tag, you should define a child tag – for example a div. The Place. Holder control doesn’t generate any markup of its own and therefore it is just perfect for the job. The runat=server attribute is necessary to let the List. View control add any generated markup tree.
The ID of the placeholder element for data items defaults to “item. Placeholder”. When no element in the layout template has this name, the List. View looks for the value of the Item. Placeholder. ID property.
If this property is empty, or points to a missing element, then an exception will be thrown. In a table layout, there’s not much you can put in the template – only a table row. However, if you place an empty row and set it to a give a given height you can use it to space out items. The Item. Template is required in a List. View control and indicates the template to use for each bound item. The Alternating. Item. Template property is optional and can be used to differentiate every other item.
Most of the time, the alternating item template is just the same as the regular item template, only styled differently. However, if required more extensive changes to the alternating template are allowed. For example, in a table layout you might want to slightly indent any alternating items. In standard mode, you define a layout template and the control repeats the item template for each bound record. In alternative mode, you partition the set of bound items in groups and define an additional group template.
The Group. Template property adds an intermediate, optional layer in between the layout and item template. When you specify a group template, the total number of bound records is partitioned in groups and the item template is applied to the records in each group. When a group has been rendered, the control moves to the next one. A separator may be inserted to separate groups. The default value is 1.
As an example, if you set Group. Item. Count to 5, you’ll have a group item every five data- bound items until there are no records left. And what if the bound data source has a number of items that is not a perfect multiple of the group item count? That’s where the Empty. Item. Template property fits in. The Empty. Data. Template property specifies the output you want to obtain when the bound data source is empty. Group. Item. Count is a read- write property.
This means that you can change the size of each group programmatically based on some runtime conditions. Needless to say, you can’t assign the property a value less than zero; on the other hand, there’s no upper bound to the value of the property.
As you assign a new value to Group. Item. Count, the property resets an internal data binding flag and performs a new binding operation. If you change the value of Group. Item. Count over a postback, the List. View is automatically rendered with updated markup. While generating its markup, the List.
View control loops over the data source and instantiates the group template (if any) every given number of data items. For performance reasons, the association between items and groups is not persisted. This means that you can obtain an output like that in Figure 2, but can’t further extend the List. View control to group items based on a logical condition.
This is a technical limitation quite hard to overcome without resorting to a custom List. View control. Try debugging inside the source code of the Create. Items. In. Groups method of the List. View class. Declared protected and virtual, the method could be overridden in a derived List. View class. However, its structure is too complex to be edited without having access to the source code. A lot of private methods and variables have to be manipulated in order to extend the rendering logic to conditional groups. You start by adding a List.
View handler for the Item. Data. Bound event. The event fires when the list view data item is being associated with the corresponding data record. This can only be Data. Item – a value from the List.
View. Item. Type enumerated type. A data item type is an instance of the List. View. Data. Item class. The Data. Item property on the currently rendered item references the data to be displayed. In this case, I assume we have a collection of Customer objects bound to the List. View. As a result, an instance of the Customer class is the data object for item being rendered.
The ultimate purpose of this search is accessing the controls in the group template to modify the final user interface. Here’s how you get the List. View container. Control container = current.
Item. Naming. Container. Next, you search for a particular control in the group template. Label group. Header. Header = (Label) container.
Find. Control(. Amongst other things, you do not even know the index of the current group. The Display. Index property on the List. View class only indicates the index of the item being processed.
However, because the size of each group is fixed – and stored by the Group. Item. Count property – you can easily obtain the 0- based index of the current group. You track the index of the current group in a global variable, and whenever a new group is found, you update the header (see Figure 2).
You place buttons in the layout template, associate buttons with proper command names, and you’re done. Buttons can be global to the list (insert, sort, page) or specific of a particular item (update, delete).