ImageButton Class
Assembly: System.Web (in system.web.dll)
public ref class ImageButton : public Image, IPostBackDataHandler, IPostBackEventHandler, IButtonControl
public class ImageButton extends Image implements IPostBackDataHandler, IPostBackEventHandler, IButtonControl
public class ImageButton extends Image implements IPostBackDataHandler, IPostBackEventHandler, IButtonControl
Not applicable.
Use the ImageButton control to display an image that responds to mouse clicks.
Both the Click and Command events are raised when the ImageButton control is clicked.
By using the OnClick event handler, you can programmatically determine the coordinates where the image is clicked. You can then code a response, based on the values of the coordinates. Note that the origin (0, 0) is located at the upper left corner of the image.
You can use the OnCommand event handler to make the ImageButton control behave like a Command button. A command name can be associated with the control by using the CommandName property. This allows multiple ImageButton controls to be placed on the same Web page. The value of the CommandName property can then be programmatically identified in the OnCommand event handler to determine the appropriate action to perform when each ImageButton control is clicked. The CommandArgument property can also be used to pass additional information about the command, such as specifying ascending order.
By default, page validation is performed when an ImageButton control is clicked. Page validation determines whether the input controls associated with a validation control on the page all pass the validation rules specified by the validation control. To prevent page validation from occurring, set the CausesValidation property to false.
Accessibility
The markup rendered by default for this control might not conform to accessibility standards such as the Web Content Accessibility Guidelines 1.0 (WCAG) priority 1 guidelines. For details about accessibility support for this control, see ASP.NET Controls and Accessibility.
The following code example demonstrates how to create an ImageButton control that displays the coordinates at which an image is clicked.
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| The following code sample uses the single-file code model and may not work correctly if copied directly into a code-behind file. This code sample must be copied into an empty text file that has an .aspx extension. For more information on the Web Forms code model, see ASP.NET Web Page Code Model. |
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System.Web.UI.Control
System.Web.UI.WebControls.WebControl
System.Web.UI.WebControls.Image
System.Web.UI.WebControls.ImageButton
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