Question

Using a unparseable cruft on my ajax responses.

Works great, except IE7 which throws a failure. Any thoughts on why the failure?

ajax call:

$.ajax({
        type: "POST",
         url: "js/zipcodeLookup.json", //mock json response
         contentType: "application/json",  
        dataType:"text json",
        data: "{postalcode: '" + $(myField).val() + "', country: '" + myCountry + "'}",
        success: function(data) {
            //do something here

        },
        error: function(){
        alert('failure');
      }

     });

ajax converter:

    $.ajaxSetup({ 
            converters: { "text json": function (stringData) { 
                        return JSON.parse(stringData.replace('for(;;);', '')); 
            } } 
}); 

and json:

for(;;);{
    "isError": "false",
    "city": "Springfield",
    "juris": "IL"
}

EDIT

and the correct answer is that I stupidly overlooked my parse method – use jQuery.parseJSON() instead!

Answer 1

IE < 8 doesn’t have native support for JSON. Do you have any fallback mechanism for IE7?

For browsers without native JSON support you should use this library

You could implement a fallback mechanism like this

<script>window.JSON|| 
    document.write("<script src='js/json2.js'>\x3C/script>")
</script>