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Editorial Team
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Asked: 2026-06-12T08:32:09+00:00

Heres my client-side code <!DOCTYPE html> <html lang=en> <head> <meta charset=utf-8> <title>Alerter</title> </head> <body>

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Heres my client-side code

<!DOCTYPE html>
 <html lang="en">
 <head>
   <meta charset="utf-8">
   <title>Alerter</title>
 </head>
 <body>
   <script src="jquery.min.js"></script>
   <script src="http://www.example.com:8001/socket.io/socket.io.js"></script>
   <script>
     $(document).ready(function(){

       var socket = io.connect('http://www.example.com:8001');
       socket.on('message', function (data) { do_message(data) });
     });

   function do_message(data){
     var $obj=$(jQuery.parseJSON(data));
     //now what goes in here? 
   };
</script>
</body>
</html>

And the javascript object I receive looks like

{
    "root": {
        "status": [
            "OK"
        ],
        "alert": [
            {
                "$": { "src": "web" },
                "time": [ "1349316382" ],
                "id": [ "user1" ]
            },
            {
                "$": { "src": "web" },
                "time": [ "1349316391" ],
                "id": [ "user2" ]
            },
        ]
    }
}

And what I want to do is iterate over each of the “alert” entries and take appropriate action (the actual schema is a bit more complicated than I’ve shown above)

Are jQuery selectors the right tool for this task or should I got back to native javascript (ie getElementsByTagName or similar). All the jQuery docs are based around selecting valid html tags from the DOM, I cant figure out how to select arbitary tags from the received message.

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1 Answer

  1. Editorial Team

    You can iterate over the data using $.forEach:

    var obj = jQuery.parseJSON(data);

$.each(obj['root']['alert'], function(index, value) {
    console.log(value.id);
});

    Or you can just use regular JS:

    var obj = jQuery.parseJSON(data);
var alerts = obj['root']['alert'];

for (var key in alerts) {
    var value = alerts[key];

    console.log(value.id);
});
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