调试AJAX请求

Question

I am currently trying to figure out how I can find out what errors are in my php script.

I have made a small script which an error on purpose. Using the chrome console I get...

Uncaught SyntaxError: Unexpected token < 

However, normally PHP errors would point you to the line in which the error occurs.

Here is my AJAX Request.

var myData = "Hello";

        $.ajax({ 
            type: "GET",
            url: 'test.php',
            datatype: 'json',
            data: { data: myData},
            success: function(output) {
                var result = $.parseJSON(output);
                for(var i=0; i<result.length; i++){
                    console.log(result[i]);
                }
            }
        });

And my PHP script with the syntax error

$data = ($_GET['data']);
echoo boom;
echo json_encode(array($data, "test"));

As you can see, line 2 is the error but the error in my console gives me no information as such.

Thanks

Answer 1

$.ajax({ 
    type: "GET",
    url: 'test.php',
    datatype: 'json',
    data: {},
    success: function(output) {
        result = output;
        for(var i=0; i < result.length; i++){
            console.log(result[i]);
        }
    }
});

By defining the dataType as json the output is already parsed. Parsing the already parsed 'output' again led to the error. So it was a client side / javascript error.

ALso note that - in case an error occurs - the actual error message is parsed too. So you get an array containing the "fragmented" error message from the server ;)