I am new to the use of jQuery for handling AJAX, and have written a basic script to get the basics down. Currently I am POSTing an AJAX request to the same file, and I wish to do some additional processing based on the results of that AJAX call.
Here is my code:
**/*convertNum.php*/**
$num = $_POST['json'];
if (isset($num))
echo $num['number'] * 2;
?>
<!DOCTYPE html>
<html>
<head>
<script src="https://ajax.googleapis.com/ajax/libs/jquery/1.9.1/jquery.min.js"></script>
<style type="text/css">
td {border:none;}
</style>
</head>
<body>
<table width="800" border="1">
<tr>
<td align="center">Number To Send<br /><input type="text" id="numSend" size="40%" style="border:2px solid black;"></td>
<td align="center">Number Returned<br /><input type="text" id="numReturn" size="40%" readonly></td>
</tr>
<tr><td align="center" colspan="4"><input type="button" value="Get Number" id="getNum" /></td></tr>
</table>
<script>
$(document).ready(function () {
$('#getNum').click(function () {
var $numSent = $('#numSend').val();
var json = {"number":$numSent};
$.post("convertNum.php", {"json": json}).done(function (data)
{
alert(data);
}
);
});
});
</script>
</body>
</html>
Here is the response I get if I submit the number '2':
4
<!DOCTYPE html>
<html>
<head>
<script src="https://ajax.googleapis.com/ajax/libs/jquery/1.9.1/jquery.min.js"></script>
<style type="text/css">
td {border:none;}
</style>
</head>
<body>
<table width="800" border="1">
<tr>
<td align="center">Number To Send<br /><input type="text" id="numSend" size="40%" style="border:2px solid black;"></td>
<td align="center">Number Returned<br /><input type="text" id="numReturn" size="40%" readonly></td>
</tr>
<tr><td align="center" colspan="4"><input type="button" value="Get Number" id="getNum" /></td></tr>
</table>
<script>
$(document).ready(function () {
$('#getNum').click(function () {
var $numSent = $('#numSend').val();
var json = {"number":$numSent};
$.post("convertNum.php", {"json": json}).done(function (data)
{
alert(data);
}
);
});
});
</script>
</body>
</html>
Obviously I'm only interested in receiving and using the number '4', hence my question: What is the best way to specify exactly what data I want returned?
Some thoughts I've had:
- wrapping all my HTML inside a if statement (i.e., if $num isset, do NOT output html; else output HTML) but then I'm echoing HTML, and I'd rather not do that.
- Setting up a separate PHP script to receive my AJAX call: That was what I did originally, and it works just fine. However, I am interested in keeping everything inside one file, and wanted to explore possible ways of doing so.
I'm sure there is an elegant way to do this. Thanks for any suggestions!
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