in Java Make DataMatrix in Java Sending Arrays of Form Data

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Make DataMatrix in Java <html> <head> <title> Sending Arrays of Form Data </title> </head>

<html> <head> <title> Sending Arrays of Form Data </title> </head>
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<body> <center> <h1> Sending Arrays of Form Data </h1> <form method="post" action="formarraysphp"> Enter your name: <input name="data[name]" type="text"> <br> <br> Enter your height in inches: <input name="data[height]" type="text"> <br> <br> <input type="submit" value="Submit"> </form> </center> </body> </html>
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You can see what this page, formarrayshtml, looks like in Figure 11-6, where the user has entered some information and is just about to click the Submit button
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Figure 11-6 Preparing to send form data in arrays to PHP
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Creating the PHP
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In the PHP script, formarraysphp, you can recover the array containing the form data and name it $data:
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<html> <head> <title> Receiving Arrays of Form Data </title> </head> <body> <center> <h1> Receiving Arrays of Form Data </h1> Your name is < php $data = $_REQUEST['data']; </center> </body> </html>
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And you can recover the user s name by referencing it as $data['name']:
<html> <head> <title> Receiving Arrays of Form Data </title> </head> <body> <center> <h1> Receiving Arrays of Form Data </h1> Your name is < php
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$data = $_REQUEST['data']; echo $data['name'], "<br>"; > </center> </body> </html>
You can also display the user s height in inches like this:
<html> <head> <title> Receiving Arrays of Form Data </title> </head> <body> <center> <h1> Receiving Arrays of Form Data </h1> Your name is < php $data = $_REQUEST['data']; echo $data['name'], "<br>"; > Your height in inches is < php $data = $_REQUEST['data']; echo $data['height'], "<br>"; > </center> </body> </html>
You can see the results in Figure 11-7 Nice
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Validating User Input with Ajax and PHP
Figure 11-7 Displaying form array data
Wrapping Applications into a Single PHP Page
Most PHP applications that you see don t start with an HTML page and then go to a PHP page, as ours have been doing In most PHP applications, everything is wrapped up into a single PHP page, and displaying everything in a PHP page means returning at least two different pages to the browser: a welcome page, where you ask the user to enter their data, and a results page, where you process the data they ve sent and return the results to them So how do such applications do that How do they know which page to return The usual way is to check whether there s any data waiting to be processed if not, the application displays the welcome page; if so, the application processes that data and sends back the results page Here s how that looks in a new, single-page example, singlepagephp In the welcome page, we ll ask the user for their name and display that name in the results page So how do we know if we ve got data (that is, the user s name) to process We can check if there is any data in the $_REQUEST array under "name":
<html> <head> <title> A PHP Application in a Single Page </title> </head> <body> <center> <h1>A PHP Application in a Single Page</h1> < php if(isset($_REQUEST["name"])){ > </center> </body> </html>
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If the name data is waiting for us, we can echo it back to the browser:
<html> <head> <title> A PHP Application in a Single Page </title> </head> <body> <center> <h1>A PHP Application in a Single Page</h1> < php if(isset($_REQUEST["name"])){ > Your name is < php echo $_REQUEST["name"]; } > </center> </body> </html>
On the other hand, if there is no name data waiting for us, we can display the welcome page, which asks the user for their name by using a text field in a new form that will send its data back to the same page, singlepagephp:
<html> <head> <title> A PHP Application in a Single Page </title> </head> <body> <center> <h1>A PHP Application in a Single Page</h1> < php if(isset($_REQUEST["name"])){ > Your name is < php echo $_REQUEST["name"]; }
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else { >
Validating User Input with Ajax and PHP
<form method="post" action="singlepagephp"> Please enter your name: <input name="name" type="text"> <br> <br> <input type="submit" value="Submit"> </form> < php } > </center> </body> </html>
Note that in single-page PHP applications, you can omit the action attribute in the <form> element, because the default action is to send the form s data back to the same page That means you could also write singlepagephp like this:
<html> <head> <title> A PHP Application in a Single Page </title> </head> <body> <center> <h1>A PHP Application in a Single Page</h1> < php if(isset($_REQUEST["name"])){ > Your name is < php echo $_REQUEST["name"]; } else { > <form method="post"> Please enter your name: <input name="name" type="text"> <br> <br>
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