Figure 14-5: Check boxes and radio buttons. in Visual Studio .NET

Generating Quick Response Code in Visual Studio .NET Figure 14-5: Check boxes and radio buttons.
Figure 14-5: Check boxes and radio buttons.
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CHAPTER 14: ADDING FORMS
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When you first run it, you see that the HTML5 has already been selected. That s because the checked attribute is added to the tag. It s a Boolean, but you don t have to assign it a true or false. After the page loads, see what happens when you click it. What you see in the output window is that all the values that were assigned to the selected radio buttons and check boxes. In more practical implementations, that same data would be passed to and stored in a database.
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DATE PICKER
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The last input attribute we have space to cover in this chapter is simple to implement but has impressive results. The new date attribute for the input element is powerful and easy to include in a form. Several new date and time attributes have been added to the input element, but only the date attribute itself is shown. The following program (Pickers.html in this chapter s folder at www.wiley.com/go/smashinghtml5) shows you how to set it up and use it to send information.
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<!DOCTYPE HTML> <html> <head> <script type= text/javascript > FormMaster=new Object(); FormMaster.resolveForm=function() { alert(document.calendar.dateNow.value); } </script> <meta http-equiv= Content-Type content= text/html; charset=UTF-8 > <title>Date</title> </head> <body > <form name=calendar> <input name=dateNow type= date onChange= FormMaster.resolveForm() > </form> </body> </html>
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With just that little markup in the form container, you re able to build a complete calendar. You can use the onChange event handler to capture the date selected from the calendar. Figure 14-6 shows the application in an Opera browser (the only one found to work so far with this new input attribute) in a Windows 7 environment. In this particular implementation, as soon as the user makes a selection, the alert window opens and shows the selected date, as shown in Figure 14-7. The purpose is to show how easy it is to pass the selected date value. Such data could be stored in a database to make online reservations.
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PART IV: DYNAMIC HTML5 TAGS PLUS A LITTLE JAVASCRIPT AND PHP
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Figure 14-6: A simple markup provides a calendar online.
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Figure 14-7: Passing the date value to JavaScript.
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The little window behind the alert window shows the selected date in a small window. (The little window shows the selected date with no other required programming.) The importance of this new HTML5 feature lies in the ease with which users can select a date. If you ve ever worked with a similar tool in making airline or hotel reservations online, you know how valuable it is. The only problem at the time of this writing is that no other HTML5 browser other than Opera includes it.
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CHAPTER 14: ADDING FORMS
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TAKE THE WHEEL
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The major takeaway from this chapter is how to use the DOM to access form information. The basic format is:
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document.form.element.value
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You need to use JavaScript (at this stage) to access data that would generally be passed on to a server-side program like PHP, ColdFusion, or ASP.NET. However, to simulate that, the examples in this chapter have used a button input type to fire a JavaScript program that sends the results to a <textarea> where you can see what would normally be sent to the back end for processing. Here s the challenge: Devise an online store that sells a line of products (at least five) or delivers services (again, at least five). Examples would be a computer store or a Web design service. Design an interface where users enter their name, e-mail, URL, address, city, state, zip code, and a username and password, with as little effort on their part as possible. To make it bulletproof, test it with someone who s never seen it before. Users then select several products or services (again with as little effort on their part as possible). The selected offerings are then displayed in a <textarea> with their corresponding individual prices along with appropriate tax. The program also generates a shipping label. It will just be displayed in the <textarea> not printed out. The more form elements and attributes that you can use that were not discussed in the chapter, the better.
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