ASP.NET Tutorial/ASP.net Controls/ImageButton — различия между версиями

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Текущая версия на 15:00, 26 мая 2010

Important properties, methods and events of ImageButton control

   <source lang="csharp">

AccessKey: a key that navigates to the ImageButton control. AlternateText: alternate text for the image (required for accessibility). DescriptionUrl: a link to a page that contains a detailed description of the image (required to make a complex image accessible). CommandArgument: a command argument that is passed to the Command event. CommandName: command name that is passed to the Command event. Enabled: disable the ImageButton control. GenerateEmptyAlternateText: set the AlternateText property to an empty string. ImageAlign: align the image relative to other HTML elements in the page. 

                Possible values are AbsBottom, AbsMiddle, Baseline, Bottom, Left, 
                Middle, NotSet, Right, TextTop, and Top.

ImageUrl: URL to the image. OnClientClick: a client-side script that executes when the ImageButton is clicked. PostBackUrl: post a form to a particular page. TabIndex: tab order of the ImageButton control. Focus: set the initial form focus to the ImageButton control. Click: Raised when the ImageButton control is clicked. Command: Raised when the ImageButton control is clicked. 

                The CommandName and CommandArgument are passed to this event.</source>

The second parameter passed in is an instance of the ImageClickEventArgs class.

   <source lang="csharp">

This class has the following properties: X: The x coordinate relative to the image the user clicked. Y: The y coordinate relative to the image the user clicked.

<%@ Page Language="C#" %> <!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd"> <script runat="server"> 

   protected void btnTarget_Click(object sender, ImageClickEventArgs e)
   {
       if ((e.X > 90 && e.X < 110) && (e.Y > 90 && e.Y < 110))
           lblResult.Text = "You hit the target!";
       else
           lblResult.Text = "You missed!";
   }

</script> <html xmlns="http://www.w3.org/1999/xhtml" > <head id="Head1" runat="server"> 

   <title>ImageButton Target</title>

</head> <body> 

   <form id="form1" runat="server">

   <asp:ImageButton
       id="btnTarget"
       ImageUrl="http://www.nfex.ru/style/logo.png"
       Runat="server" OnClick="btnTarget_Click" />
   


   <asp:Label
       id="lblResult"
       Runat="server" />

   </form>

</body> </html></source>


Using the ImageButton Control

   <source lang="csharp">

<%@ Page Language="C#" %> <!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd"> <script runat="server"> 

   protected void btnSubmit_Click(object sender, ImageClickEventArgs e)
   {
       lblResults.Text = "First Name: " + txtFirstName.Text;
       lblResults.Text += "
Last Name: " + txtLastName.Text;
   }

</script> <html xmlns="http://www.w3.org/1999/xhtml" > <head id="Head1" runat="server"> 

   <title>Show ImageButton</title>

</head> <body> 

   <form id="form1" runat="server">

   <asp:Label
       id="lblFirstName"
       Text="First Name:"
       AssociatedControlID="txtFirstName"
       Runat="server" />
   

   <asp:TextBox
       id="txtFirstName"
       Runat="server" />
   


   <asp:Label
       id="lblLastName"
       Text="Last Name:"
       AssociatedControlID="txtLastName"
       Runat="server" />
   

   <asp:TextBox
       id="txtLastName"
       Runat="server" />
   


   <asp:ImageButton
       id="btnSubmit"
       ImageUrl="http://www.nfex.ru/style/logo.png"
       AlternateText="Submit Form"
       Runat="server" OnClick="btnSubmit_Click" />
   


   <asp:Label
       id="lblResults"
       Runat="server" />

   </form>

</body> </html></source>

Источник — «http://nfex.ru/index.php?title=ASP.NET_Tutorial/ASP.net_Controls/ImageButton&oldid=3399»