CODEWITHSUNDEEP
phpjavascriptajaxstatus
Sefu
Sefu

Reputation: 2494

Can I return an output status from a JQuery AJAX request with PHP?

I have an AJAX request (using JQuery) that calls a PHP script which does some database business. The request code is as follows:

$.ajax({
    url: "script.php",
    data: { value: value
        },
    type: 'post',
    success: function(output){
        alert(output);
    }
});

However, I wanted to see if there was a way to also (in addition to the unchanged output string) return a status. It can be as simple as an integer. The point is I want to disable a button (with Javascript) if the PHP script for any reason fails to connect to mySQL, but I still want the PHP scripts output exactly as it would be.

I tried the error option:

...
success: function(output){
        alert(output);
    },
error: function(output){
        // do something
    }

but I do not know how to make PHP display an error and continue on the rest of the script. Again, I don't want to tamper at all with the output string.

In pseudo-code, I'm looking for something like this:

$.ajax({
    url: "script.php",
    data: { value: value
        },
    type: 'post',
    success: function(output){
        if(output.status == 0){
            alert(output);
        }else{
            // do something else
        }
    }
});

Is anything of the sort possible? Thanks for any and all help!

Upvotes: 1

Views: 2560

Answers (3)

dqhendricks
dqhendricks

Reputation: 19251

I usually return data from the server in JSON format. This way I can return as many different types of data as may be needed by the success function in javascript.

basically in PHP you would do something like

$response = new stdClass();
$response->error = 'Could not connect to Mysql';
$response->message = 'Some other text';
echo json_encode($response);

in JQuery, the ajax() method would automatically detect that the response is json and parse it into a javascript object, so you could access like this

if (typeof response.error !== undefined) alert(response.error);

for more on that look at dataType argument for the ajax() method in the jQuery documentation.

Upvotes: 2

inhan
inhan

Reputation: 7470

If I haven't misunderstood your question...

What I usually do is set the datatype of the AJAX call to 'xml' and output an xml from my PHP script. So I get multiple values in result. I usually make these attribute values.

<result status="success" something="etc" />
// vs.
<result status="failure" error="1" />
// consider 1 as the DB error

With this approach you might need to use the @ tags in some PHP functions to prevent outputting the default errors.

Upvotes: 1

FtDRbwLXw6
FtDRbwLXw6

Reputation: 28929

Yes. You can use HTTP status codes:

header('HTTP/1.1 500 Internal Server Error');

And use jQuery's statusCode property for jQuery.ajax():

$.ajax({
    // stuff
    statusCode: {
        500: function(data) {
            alert('Something went wrong!');
        }
    }
});

If your needs extend beyond what HTTP can offer, you can just return a status code within your data and process it in the success function, switching on data.status.

Upvotes: 1

Related Questions