unterminated string constant error only with IE 9

Question

Ok i got this error in IE 8 and 9, this is Ajax call

$('#$id').ajaxForm({
beforeSend: function() {
$("#{$this->name}_div").hide();
$("#{$this->name}_message").hide(); 
$("#{$this->name}_message").show().html('<img src="$gif">');
},
success: function(response)
{
     var response = JSON.parse(response);
     if (response.error != 'undefined')
{
...
}

}

Problem is in this line of JavaScript code

 var response = JSON.parse(response);

My Javescript, broke, script works in othere browsers and in Internet explorer 10, i am worried if someone with older IE try to visit my site. Is there any solution for this error?

Answer 1

Why are you trying to parse the JSON yourself? ajaxForm provides a dataType option for that:

$('#$id').ajaxForm({
    beforeSend: function() {
        $("#{$this->name}_div").hide();
        $("#{$this->name}_message").hide(); 
        $("#{$this->name}_message").show().html('<img src="$gif">');
    },
    dataType: 'json',
    success: function(response){
       if (response.error != 'undefined') {
           ...
       }
    }
});

On the other hand, if there's something invalid in your JSON that other browsers just happen to be tolerating, then pretty much the only answer is to fix your JSON.