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The building blocks of our Web Forms are the controls that give us the ability to display data to the user, as well as enabling the user to interact with the application There are a couple of families of controls available for use in ASPNET Web Forms: there are the traditional HTML controls that can be used as is, with no further involvement from the server, and there are the intrinsic HTML controls that use a server control to encapsulate the HTML control (rich controls), giving us a richer object model to work with In the ASPNET environment we have validation controls that we can use to validate the data from the user, and we looked at the use of these controls in 12 What this section will add to the control pallet is the use of the so-called rich controls These are controls with no direct HTML counterpart they are combinations of different intrinsic controls that form a functional unit ASPNET automatically senses the browser version and manufacturer used by the client, and it renders the server controls properly for that browser This means you do not
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have to produce a least common denominator version of your site or have multiple versions for different browsers For example, we do not have to produce one version of our web site for each browser on the market; ASPNET provides support to generate HTML that is browser specific taking care not to send HTML elements that are not supported in the browser In some cases the generated HTML code is the same as is the case with the ListBox control that would be rendered in the same fashion by both Netscape and Internet Explorer, while the Calendar control would be rendered totally different between the different browsers Your Web Forms can be configured to meet a lowest-common-denominator browser by changing the setting for TargetSchema on the document object, as shown in Figure 14-1 You would change this setting to the lowest browser version that you must support; Internet Explorer 5 is the default for this property Set this property based on the expected client base if the site will be used on the Internet, you could set it to a version 4 browser; for an intranet you could set a very specific, high-version browser
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Figure 14-1 Changing the TargetSchema for the Web Form
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14: Server Controls in ASPNET
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Base Properties of Server Controls
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All the server controls have a common set of base properties, in addition to their specific properties The base properties are used to control the look and feel of the control Table 14-1 lists the more commonly used base properties and outlines their use These are just a few of the properties that are available to us in Visual Studio NET Although there are more properties than some browsers can support, the NET Framework will render the control based on the target browser, ensuring that the page will look okay in any browser The following Label control uses some of the properties for the control:
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<asp:Label id="Label1" runat="server" Height="80px" Width="320px" BackColor="DodgerBlue" BorderStyle="Ridge" BorderWidth="6px" Font-Names="Kristen ITC" Font-Size="XX-Large" > Hello World!</asp:Label>
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PART III
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The Label control is actually rendered as an HTML span for both Netscape and Internet Explorer The HTML for Internet Explorer looks like this:
<span id="Label1" style="background-color:DodgerBlue; border-width:6px; border-style:Ridge; font-family:Kristen ITC; font-size:XX-Large; height:80px; width:320px; LEFT: 10px; POSITION: absolute; TOP: 15px"> Hello World!</span>
Description
BackColor
BorderWidth Enabled
Font
ForeColor Height ToolTip
Visible
Width Table 14-1
Sets the background color of the control This property can be set to any of the color constants in the NET Framework s Color structure property, such as DodgerBlue, AntiqueWhite, or to hexadecimal literal values like #C8C8C8 (gray) Sets the width of the control s border, in pixels Determines whether or not the control is available for user interaction If this property is set to False, the control will be grayed out and the control will not process any event until the Enabled property has been set to True Controls the appearance of the text in the control This property has a number of subproperties, such as Size, which specifies the size of the font; Name, which specifies the name of the font; and Bold, which can be set to True or False to make the font bold or not Determines the color of the text in the control Sets the height of the control Specifies the text to be displayed beside the control when the user keeps the mouse pointer near the control This property is one of the ways we can use to actually teach our users how to use our web site Determines whether the control is visible (True) or hidden (False) Use this property to hide controls that are not initially needed, and then display them based on the user s selections Sets the width of the control
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