My problem may be simple but I can't just find what it is wrong. I am doing some ajsx/jQuery code for practising and learning more but jQuery and AJAX has a weird thing about it for me. I can't find any complete info about dataTypes and how to retrieve and manipulate each type (text, html, json, jsonp (I don't know what is jsonp), etc).
I copied headers in the HTML page and in the PHP file and even in the AJAX object.
First dataType question: If I ask for text or html data it seems that if I do an .append() or .text() it seems that it copies all the php file literally and write it in the alert or in the html document, it copies all PHP code even though I want only to retrieve the thing I echo in my php file.
Sometimes I do echo "test"; and if I do an alert of the data retrieved as text or html it will output test"; being the echo the last line on the php file. So this dataType thing is confusing to me.
Then the AJAX/JSON question. I am copying the simple code so you can see what is the problem. The code is simple code for the sake of testing because I didn't want to complicate it more until I'm sure the basic things work.
HTML FILE:
<!DOCTYPE HTML>
<html>
<head>
<meta http-equiv="Content-type" value="text/html; charset=UTF-8" />
<title></title>
<script type="text/javascript" src="http://code.jquery.com/jquery-1.11.3.min.js"></script>
<script type="text/javascript">
$(document).ready(function(){
//Guardar al cargar la pagina la ip en el servidor.
var a1 = {
url: "servidor_datos.php",
async: true,
type: "GET",
contentType: "application/json; charset=utf-8",
dataType: 'json',
success: function(data){
alert(data);
//$("#contador").append("test");
},
error: function(){
alert("Error");
}
};
$.ajax(a1);
});
</script>
</head>
<body>
<div id="contador"></div>
</body>
</html>
PHP FILE:
<?php
header('Content-Type: application/json; charset=utf-8');
$json = array("data" => "asdf");
$json = json_encode($json);
echo $json;
I'm trying to do a unique IP visitor counter and I'm not sure If I'm doing it correctly. First I check if the IP exists and if not I add the new ip to the database. Then I execute an Ajax request using a setInterval every 5 seconds to keep checking and updating the number of unique visitors and update it asynchronously.
Is it ok to use a setInterval to keep looping and checking constantly or should I do it in another way like a server event firing a code piece that checks the number of visitors and sending it asynchronously? Whatever it is, I'd want it to be updated without having to refresh the page. So I don't know if a server sent events or JavaScript web workers should be a better approach.
