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Jquery ajax

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Craig Hopson    1

hi can some one explain to me what is going on with this code please

index.php

<!DOCTYPE html>
<script src="//ajax.googleapis.com/ajax/libs/jquery/1.8.0/jquery.min.js" type="text/javascript"></script>
<script>
var data = 'something-here';
$.ajax({
type: 'POST',
url: 'post.php',
data: data
});
</script>[/CODE]

post.php

[CODE]<?php
ob_start();
var_dump($_POST);
$data = ob_get_clean();
$fp = fopen("textfile.txt", "w");
fwrite($fp, $data);
fclose($fp);
?>[/CODE]

textfile.txt

[CODE]array(0) {
}[/CODE]

why is the $_POST variable empty? and how would i post 2 variables like $_POST['firstname'] and $_POST['lastname']

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Mr. Half    3

The jQuery ajax method expects 'data' to be an object, rather than a string.

You should change this line:


var data = 'something-here';
[/CODE]

to this:

[CODE]
var data = { 'firstname': 'John', 'lastname': 'Smith' };
[/CODE]

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Craig Hopson    1

The jQuery ajax method expects 'data' to be an object, rather than a string.

You should change this line:


var data = 'something-here';
[/CODE]

to this:

[CODE]
var data = { 'firstname': 'John', 'lastname': 'Smith' };
[/CODE]

Thanks been looking for this answer for long time i'm still learning how would i replace "John" with a variable

[CODE]var firstname = 'john';[/CODE]

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Craig Hopson    1

ok some more details here is the full script


<!DOCTYPE html>
<html>
<head>
<script src="//ajax.googleapis.com/ajax/libs/jquery/1.8.0/jquery.min.js" type="text/javascript"></script>
<style>
#tripmeter {
border: 3px double black;
padding: 10px;
margin: 10px 0;
}

p {
color: #222;
font: 14px Arial;
}

span {
color: #00C;
}
</style>
</head>
<body>
<div id="tripmeter">
<p>
Starting Location (lat, lon):<br/>
<span id="startLat">???</span>°, <span id="startLon">???</span>°
</p>
<p>
Current Location (lat, lon):<br/>
<span id="currentLat">???</span>°, <span id="currentLon">???</span>°
</p>

</div>
<script>
window.onload = function() {
var startPos;

if (navigator.geolocation) {
navigator.geolocation.getCurrentPosition(function(position) {
startPos = position;
document.getElementById("startLat").innerHTML = startPos.coords.latitude;
document.getElementById("startLon").innerHTML = startPos.coords.longitude;
}, function(error) {
alert("Error occurred. Error code: " + error.code);
// error.code can be:
// 0: unknown error
// 1: permission denied
// 2: position unavailable (error response from locaton provider)
// 3: timed out
});

navigator.geolocation.watchPosition(function(position) {
document.getElementById("currentLat").innerHTML = position.coords.latitude;
document.getElementById("currentLon").innerHTML = position.coords.longitude;

});
}
};

</script>
<script>


$.ajax({
type: 'POST',
url: 'post.php',
data: data
});

</script>
</body>
</html>
[/CODE]

What i'm trying to do is log the current location every 20 seconds and pass it to post.php so it can insert it into a mysql database

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Mr. Half    3

Sounds like an interesting project.

Answering your first question, you can just replace the string with the name of the variable and it will work in exactly the same way:


var firstname = 'john';
var data = { 'firstname': firstname, 'lastname': 'Smith' };
[/CODE]

If you want to perform an action at a particular interval, take a look at the window.setInterval method. It would look something like this (the interval is in milliseconds):

[CODE]
window.setInterval(function() {
// Get position here
// Save position here
}, 20000);
[/CODE]

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