Question

I have a script which outputs JSON when needed. PHP sets headers to JSON and JSON encodes an object..

On the JS side, $.getJSON received it and all is dandy.

The problem is when my PHP outputs plain text (which is a case I have to deal with).

The bigger problem is, as much as I’d like to work a code to check for type of output from PHP side, getJSON will not trigger the callback function unless it receives a JSON type output.

So if my PHP script outputs an error code, (not encoded into JSON routine) the JS wont react..

I needed JS to react in a certain way based on PHP’s output type..

I tried to do the .get or .post JS functions but likewise, when my PHP output JSON, the callbacks for these don’t get triggered/fired.

Answer 1

Have you looked at .done() and .fail() ?

$.ajax({
    url: 'blah.php',
    data: blah,
    type: 'POST',
    dataType: 'json'
}).done(function(){
    console.log('OK');
}).fail(function(jqXHR, textStatus, errorThrown){
    console.log(textStatus+"\n"+ errorThrown);
});

… also, here’s some JS code to validate JSON …

// validate JSON
function is_JSON(str) {
    try {
        var c = $.parseJSON(str);
    } catch (e) {
        return false;
    }
    return true;
}