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5: HTML Forms: A Review
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ASPNET Setup HTML Radio Buttons As with check boxes, you need to include with radio buttons a unique id, value, and runat="server" attribute However, the HTML Radio form also has a name attribute The name attribute with radio buttons is actually a group name in that several different radio buttons with unique id values can all have the same name Otherwise, the format is the same as with the HTML Checkbox The following example shows two typical radio buttons with the same name but with different ids and values:
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<input id="Radio1" type="radio" name="party" value="Democratic" runat="server" /> <input id="Radio2" type="radio" name="party" value="Republican" runat="server" />
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As you can see, both have the name value of party When the user clicks on one radio button, all the others with the same name are unchecked They can have as many different id values as you want, but only a single radio button in a name group can be selected at any one time
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C# Reading and Writing HTML Radio Buttons When C# reads a radio button, it reads it just like check boxes The Checked property is a Boolean attached to the radio button s id value As a result, you can use the same C# ternary operator as with HTML Checkbox forms The following shows an example:
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SendValue = Radio1Checked == true Radio1Value: null;
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Notice that the name attribute is not used As a result, when checking to see if a radio button is checked, you will need to check each id separately Figure 5-7 shows a typical use of the radio button When you create a query using radio buttons, be sure to provide all possible categories The Other category would be useful for picking up users who are Libertarian, Green, or some other party not listed In Figure 5-7, if the user chooses any of the other radio button categories, the currently selected one would be unchecked (The filled circle in a radio button doesn t look like a check, but that s the name of the property)
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Figure 5-7
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Radio buttons are for mutually exclusive categories
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ASPNET 35: A Beginner s Guide
Try This
A Political Poll Using HTML Forms
For a practical view of how you might incorporate HTML forms, this next example uses several different forms Once the user completes the form, the output is presented in an HTML textarea form For data entry and calculation, the application is not very different from one you might develop for entering data into a database The following steps show how to get the application up and running:
1 Open Visual Studio 2008 and select File | New | Web Site 2 Enter the name PoliticalPoll for your application and click OK 3 Open the Solution Explorer, rename the ASPX file Poll, and enter the following code
(By this point, you know that you can save time by dragging the different HTML forms to the editor to generate some of the code automatically)
ASPNET Pollaspx
<%@ Page Language="C#" AutoEventWireup="true" CodeFile="Pollaspxcs" Inherits="Poll" %> <!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 10 Transitional//EN" "http://wwww3org/TR/xhtml1/DTD/xhtml1-transitionaldtd"> <html xmlns="http://wwww3org/1999/xhtml"> <head runat="server"> <title>Political Poll</title> </head> <body> <center><h1>New England Voter Poll</h1></center> <form id="form1" runat="server"> <div> State<br /> <!-- Select Menu --> <select id="Select1" runat="server"> <option>Select State</option> <option>Connecticut</option> <option>Maine</option> <option>Massachusetts</option> <option>New Hampshire</option> <option>Rhode Island</option> <option>Vermont</option> </select>        <!-- Input Text --> <input id="Town" type="text" value="Town Name" runat="server"/> <br /> Party Affiliation <br />
5: HTML Forms: A Review
<!-- Radio Buttons --> <input id="Radio1" type="radio" name="party" />Democratic<br /> <input id="Radio2" type="radio" name="party" runat="server"/>Republican<br /> <input id="Radio3" type="radio" name="party" runat="server"/>Independent<br /> <input id="Radio4" type="radio" name="party" >Other<p />
value="Democratic" runat="server" value="Republican" value="Independent" value="Other" runat="server"/
Important Issues (Select All that Apply)<br /> <!-- Checkboxes --> <input id="Checkbox1" type="checkbox" runat="server" />Economy<br /> <input id="Checkbox2" type="checkbox" runat="server" />Environment<br /> <input id="Checkbox3" type="checkbox" runat="server" Relations" />International Relations<br /> <input id="Checkbox4" type="checkbox" runat="server" />Election Reform <br /> <input id="Checkbox5" type="checkbox" runat="server" />Technology<p />
value="Economy" value="Environment" value="International value="Election Reform" value="Technology"
<!-- Buttons --> <input id="Reset1" type="submit" value="Clear" runat="server" OnServerClick="Reset_Click" /> <input id="Submit1" type="submit" value="Send Data" runat="server" OnServerClick="Submit_Click"/> <p /> <!-- Textarea --> <textarea id="TextArea1" cols="40" rows="10" runat="server"></textarea> </div> </form> </body> </html>
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