how to create barcode in c#.net Creating the HTML in Java

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Creating the HTML
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We can start datadumperhtml with a form that will send its data to datadumperphp:
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<html> <head> <title>Displaying All Form Data</title> </head> <body> <center> <h1>Displaying All Form Data</h1> <form method="post" action="datadumperphp"> </form> </center> </body> </html>
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And we can add some controls so that data will in fact be sent to datadumperphp, starting with a text field:
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<html> <head> <title>Displaying All Form Data</title> </head> <body> <center> <h1>Displaying All Form Data</h1> <form method="post" action="datadumperphp"> Please enter your name: <input name="name" type="text">
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<br> <br> </form> </center> </body> </html>
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We might also send some data that will be sent as an array say, fruit[] using a list box, as well as add the Submit button:
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<html> <head> <title>Displaying All Form Data</title> </head> <body> <center> <h1>Displaying All Form Data</h1> <form method="post" action="datadumperphp"> Please enter your name: <input name="name" type="text"> <br> <br> Select your favorite fruit: <br> <br> <select name="fruit[]" multiple> <option>Bananas</option> <option>Strawberries</option> <option>Apples</option> <option>Watermelons</option> </select> <br> <br> <input type="submit" value="Submit"> </form> </center> </body> </html>
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Validating User Input with Ajax and PHP
Figure 11-1 The datadumperhtml page
That finishes datadumperhtml, which you can see in Figure 11-1 Now it s time to write datadumperphp, the PHP all-purpose script that will display all the data sent to it, which is very handy for debugging purposes
Creating the PHP
Our goal in datadumperphp is to create an all-purpose PHP script that displays the form data sent to it, no matter which page sends that form data That means we need to recover the form data from the $_REQUEST array, which can handle data sent with either GET or POST, not just the $_GET or $_POST arrays Let s start with some HTML to set the scene, and a PHP section:
<html> <head> <title> Displaying All Form Data </title> </head> <body> <center> <h1>Displaying All Form Data</h1>
Ajax: A Beginner s Guide
Here is the form's data I got: <br> < php > </center> </body> </html>
Now we want to loop over all the data in the $_REQUEST array, and to do that, we ll use a foreach loop You ve already seen the first form of the foreach loop in 9:
foreach ($array as $value){ }
Here, we re looping over $array, and each time through the loop, $value holds a new element from the array The second form of the foreach loop looks like this:
foreach ($array as $index => $value){ }
Here, $index is the index of $value in the array and $index can be a number or a string (note especially that you need the => operator in this form of the foreach loop) The second form of the foreach loop is what we want to use here, because, in addition to displaying the data values we got in datadumperphp, we want to display the name of each data item So here s how we loop over the $_REQUEST array:
<html> <head> <title> Displaying All Form Data </title> </head> <body> <center> <h1>Displaying All Form Data</h1> Here is the form's data I got:
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Validating User Input with Ajax and PHP
<br> < php foreach($_REQUEST as $index => $value){ } > </center> </body> </html>
The first time through the loop, $index will hold the name of the text field, which is just "name", and $value will hold the name the user entered into the text field The second time through the loop, $index will hold the name of the list box s data array, "fruit", and $value will hold the actual $fruit array In other words, we have to handle both single-item data and array data in datadumperphp To check if $value is an array, we can use the PHP function is_array:
<html> <head> <title> Displaying All Form Data </title> </head> <body> <center> <h1>Displaying All Form Data</h1> Here is the form's data I got: <br> < php foreach($_REQUEST as $index => $value){ if(is_array($value)){ } } > </center> </body> </html>
Ajax: A Beginner s Guide
If $value is an array, we can loop over it with another foreach loop:
<html> <head> <title> Displaying All Form Data </title> </head> <body> <center> <h1>Displaying All Form Data</h1> Here is the form's data I got: <br> < php foreach($_REQUEST as $index => $value){ if(is_array($value)){ foreach($value as $number => $item){ } } } > </center> </body> </html>
Inside this new loop, we re looping over the array in the $value variable; $number will hold the index number of the items in the array, and $item will hold the name of the item itself That means that we can echo the array name, the index of the current item, and the item name itself like this:
<html> <head> <title> Displaying All Form Data </title> </head> <body> <center> <h1>Displaying All Form Data</h1> Here is the form's data I got: <br>
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