javascript - what error is this Uncaught SyntaxError: Unexpected token < when using eval in jquery? - Stack Overflow

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i've got a simple ajax call:

function message(){
    $.ajax({
        type: "GET",
        url: "/file/timestamp="+ timestamp,
        async: true,
        cache: false,
        success: function(data){
            var json = eval('('+data+')');
            console.log(json);
        }
    });
}

and i get an error Uncaught SyntaxError: Unexpected token < at this line: var json = eval('('+data+')');

any ideas?

thanks.

edit: some more details from the error:

$.ajax.successajax.js:9
f.Callbacks.njquery.js:2
f.Callbacks.o.fireWithjquery.js:2
wjquery.js:4
f.support.ajax.f.ajaxTransport.send.d

here is some php if is helping

public function fileAction()
{
    $this->getHelper('viewRenderer')->setNoRender();

    $filename = '/test/text.txt';

    $front  = Zend_Controller_Front::getInstance();
    $data   = $front->getRequest()->getParams();

    $lastModif      = !empty($data['timestamp']) ? $data['timestamp'] : 0;
    $currentModif   = filemtime($filename);

    while($currentModif <= $lastModif){
        usleep(10000);
        clearstatcache();
        $currentModif = filemtime($filename);
    }

    $response = array();
    $response['msg'] = file_get_contents($filename);
    $response['timestamp'] = $currentModif;

    echo json_encode($response);
}

if i run this action i get json: {"msg":"message","timestamp":1331599879} but for some reason the response is not this but some html

i've got a simple ajax call:

function message(){
    $.ajax({
        type: "GET",
        url: "/file/timestamp="+ timestamp,
        async: true,
        cache: false,
        success: function(data){
            var json = eval('('+data+')');
            console.log(json);
        }
    });
}

and i get an error Uncaught SyntaxError: Unexpected token < at this line: var json = eval('('+data+')');

any ideas?

thanks.

edit: some more details from the error:

$.ajax.successajax.js:9
f.Callbacks.njquery.js:2
f.Callbacks.o.fireWithjquery.js:2
wjquery.js:4
f.support.ajax.f.ajaxTransport.send.d

here is some php if is helping

public function fileAction()
{
    $this->getHelper('viewRenderer')->setNoRender();

    $filename = '/test/text.txt';

    $front  = Zend_Controller_Front::getInstance();
    $data   = $front->getRequest()->getParams();

    $lastModif      = !empty($data['timestamp']) ? $data['timestamp'] : 0;
    $currentModif   = filemtime($filename);

    while($currentModif <= $lastModif){
        usleep(10000);
        clearstatcache();
        $currentModif = filemtime($filename);
    }

    $response = array();
    $response['msg'] = file_get_contents($filename);
    $response['timestamp'] = $currentModif;

    echo json_encode($response);
}

if i run this action i get json: {"msg":"message","timestamp":1331599879} but for some reason the response is not this but some html

• javascript
• jquery
• ajax
• syntax-error

Share Improve this question Follow edited Mar 13, 2012 at 0:46 Patrioticcow asked Mar 13, 2012 at 0:35 PatrioticcowPatrioticcow 27.1k7676 gold badges221221 silver badges340340 bronze badges 5

• 3 I'm guessing you are getting XML and not JSON. – Joe Commented Mar 13, 2012 at 0:37
• If you are getting JSON, eval is both unnecessary (jQuery parses the JSON for you) and Evil. – nrabinowitz Commented Mar 13, 2012 at 0:39
• 1 console.log(data) shows what? I am guessing an html error page. – epascarello Commented Mar 13, 2012 at 0:42
• yes, bit no error, just html for some reason. – Patrioticcow Commented Mar 13, 2012 at 0:44
• Well figure that out and maybe your json will start appearing. Get Fiddler and see what the request/response is doing. – epascarello Commented Mar 13, 2012 at 0:47

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3 Answers 3

Sorted by: Reset to default 2

It depends on what's inside data. You're running eval, so whatever's in data is being run. Please post the data here,.

What are you expecting to be returned in as data? Running eval will try to execute (data) which doesn't seem like it will be proper javascript. If you just want to store a string you can do:

var json = "(" + data + ")";

jholloman almost had it...

var json = eval("(" + data.responseText + ")");

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