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CHAPTER 8 AJAX
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Figure 8-2. Welcome message displayed on selecting Submit Query button
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Using the GET HTTP method of request
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If you want to load data from the server using a GET HTTP request, you have two options: either set the value of the type key to GET in the ajax() method (or don t define this key at all as the default request method is GET) or use the $.get() method. Let s try each option in turn now, the first by setting type key to GET: $(document).ready(function() { $('#submit').click(function () { var name = $('.uname').val(); var data = 'uname=' + name; $.ajax({ type:"GET", url:"welcome.php", data: data, success: function (html) { $('#message').html(html); } }); return false; }); }); We can see that except for the type key, there is no other modification in the JavaScript file. This type key helps when you want to load the data from the server using the GET HTTP request. To make the script on the server retrieve data from the $_GET array, we need to make following alterations in the welcome.php file: < php $name = $_GET['uname']; echo "Welcome ". $name; > You can see that instead of the $_POST array, the data will be retrieved from the $_GET array. Let s use the $.get() method now for using GET HTTP request. This method invokes the GET request to the server to fetch data. It executes the script whose URL is specified, along with the parameters passed (if any): $.get(url, parameters, callback)
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These parameters are as follows: url is the server-side script that you want to execute via GET method parameters is key/value pair that you want to be passed to the server-side script for processing callback is the function that is invoked on completion of the request. It contains two parameters, the first is the response from the server side script and the second parameter is the status of execution
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So let s modify the JavaScript that we saw above to now use the $.get() method. Your code should look something like this: $(document).ready(function() { $('#submit').click(function () { var name = $('.uname').val(); var data = 'uname=' + name; $.get( "welcome.php", data, function (html) { $('#message').html(html); } ); return false; }); }); You can see that the $.get() method invokes the welcome.php file on the server and passes uname=name to it as a parameter (where name stores the name entered by the user) and the callback function displays the response (from the server) by assigning it to the div element of id message. The output we will get the same as shown in Figure 8-1 and 8-2 above.
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Making POST requests
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For making POST requests to the server, we make use of the $.post() method, which you ll use most generally when you want to make some modification in the information stored on the server. It fetches the data onto the server using POST HTTP request. It executes the script whose URL is specified along with the parameters passed (if any). This function also allows a single callback function to be specified that will be executed when the request is complete. Here s the method and parameters: $.post(url, parameters, callback)
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These parameters are as follows: url is the server-side script to which we want to send request (via the POST method) parameters is key/value pair that we want to be passed to the server-side script for processing callback is the function that is invoked on completion of the request. It contains two parameters, the first is the response from the server side script and the second parameter is the status of execution
The previous JavaScript file can therefore be modified to use the $.post() method as follows: $(document).ready(function() { $('#submit').click(function () { var name = $('.uname').val(); var data = 'uname=' + name; $.post( "welcome.php", data, function (html) { $('#message').html(html); } ); return false; }); }); You can see that the $.post() method invokes the welcome.php file on the server and passes uname=name to it as a parameter (where name stores the name entered by the user) and the callback function displays the response (from the server) by assigning it to the div element of id message. The output that you will get is the same as shown in Figure 8-1 and 8-2. Finally, please do remember that the server side script welcome.php must access the data from the $_POST array and not from the $_GET array beacuse the request sent this time is via the POST method: < php $name = $_POST['uname']; echo "Welcome ". $name; >
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