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What is wrong with this code?

Posted on 2013-11-16
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Last Modified: 2013-11-18
I include this in one of the client side Javascripts:

    function getIP() {
        var ipAddress = 'Unknown IP';
        $.ajax({
            dataType: "json",
            url: "http://smart-ip.net/geoip-json?callback=?",
            async: false,
            success: function(data) {
                ipAddress = data.host;
            }
        });
        return ipAddress;
    }

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It is executed from a click button event and always returns 'Unknown IP'. If I test the URL in my browser, I get the correct json reply.
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Question by:itnifl
  • 2
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4 Comments
 
LVL 83

Expert Comment

by:leakim971
ID: 39653148
Check the documentation : http://api.jquery.com/jQuery.ajax/

async (default: true)
Type: Boolean
By default, all requests are sent asynchronously (i.e. this is set to true by default). If you need synchronous requests, set this option to false. Cross-domain requests and dataType: "jsonp" requests do not support synchronous operation.

You're using JSONP (callback=?)
You're doing a cross-domain requests (http://smart-ip.net)

What about : http://jsfiddle.net/mB22D/

function getIP() {
    var ipAddress = "Unknown IP";
    return $.getJSON("http://smart-ip.net/geoip-json?callback=?");
}
getIP().then(function(info) {
    alert(info.host);
});

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LVL 2

Author Comment

by:itnifl
ID: 39655609
In your code, you have no other code that continues while the request is being made. Your request will be made asynchronously and the variable ipAddress will not contain the client IP when it is returned:

var ipAddress = 'Unknown IP';
function getIP() {
    return $.getJSON("http://smart-ip.net/geoip-json?callback=?");
}
getIP().then(function(info) {    
    ipAddress = info.host;
});
alert(ipAddress);

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This is why I want to execute the code synchronously so that the code will wait until the fetch for information is done and THEN return the result.

http://jsfiddle.net/mB22D/1/
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LVL 83

Accepted Solution

by:
leakim971 earned 2000 total points
ID: 39656104
It's just like you did not read my previous comment...
Anyway here a working code with your way of think : http://jsfiddle.net/mB22D/2/

<!doctype html>
<html>
<head>
<meta charset="utf-8">
<title>GET IP</title>
<script>
    var ipAddress = 'Unknown IP';
    function saveIP(info) {
        ipAddress = info.host;
    }
    function getIP() {
        return ipAddress;
    }
</script>
<script src="http://smart-ip.net/geoip-json?callback=saveIP"></script>
<script>
    alert(getIP());
</script>
</head>
<body>
</body>
</html>

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LVL 2

Author Closing Comment

by:itnifl
ID: 39656110
OK - I see, thank you very much ! :D
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