How to trigger the "error" callback in JQuery AJAX call using in PHP

Question

I have PHP code snippet the following:

if (!($result = mysql_query($query, $link))) {
   die("Invalid SQL query: " . $query);
}

And I have JQuery code snippet the following:

$.ajax({
        url: "....search.php", 
        data: ...,

        async: false, //to trigger error alert

        success: function(xml) {
            ...
        },

        error: function(xml) {
            foundError = true;
        },

        dataType: "xml"
    });

if(foundError) {
        setProgress("Could not complete the search because an error was found", ProgressBar.ERROR);
}

Is it possible to have the die call trigger JQuery error function callback? If not, how would I trigger it otherwise?

SeanCannon · Accepted Answer · 2011-07-05 21:13:29Z

9

Try this:

if (!($result = mysql_query($query, $link))) {
   header("HTTP/1.1 404 Not Found");
}

Choose the error appropriate for your application

answered Jul 5, 2011 at 21:13

SeanCannon

78.1k17 gold badges126 silver badges145 bronze badges

Sign up to request clarification or add additional context in comments.

4 Comments

Daniel Kats Over a year ago

Cool! If I send data before this (ex. before PHP code posted I had echo "hello world";) then this would not work, correct? Wondering if there are other ways.

Jason McCreary Over a year ago

@BlackSheep, header() calls must be made before other output (i.e. echo "hello world").

SeanCannon Over a year ago

You could easily call ob_start() at the top of the page, ob_end_flush() at the bottom, and then call ob_clean() right before your header to erase the output buffer if anything is in it.

Daniel Kats Over a year ago

Thanks very much. I did not know about the ob_X methods. They are very useful. =)

Justin ᚅᚔᚈᚄᚒᚔ · Accepted Answer · 2011-07-05 21:13:24Z

0

You cannot signal client-side code from the server (at least, not in the way you're expecting).

When using AJAX, best to use proper HTTP response codes and have jQuery act upon those in the error: callback.

answered Jul 5, 2011 at 21:13

Justin ᚅᚔᚈᚄᚒᚔ

15.4k8 gold badges55 silver badges64 bronze badges

Comments

jeroen · Accepted Answer · 2011-07-05 21:17:16Z

0

You cannot access the ajax error like that as there was no ajax error. What you could do, is check your xml variable in the success section; if it starts with Invalid SQL query you know there was a php error.

To tidy things up, you probably want to return some more information (xml / json) in case of an error instead of just a string.

answered Jul 5, 2011 at 21:17

jeroen

91.8k22 gold badges117 silver badges132 bronze badges

Collectives™ on Stack Overflow

How to trigger the "error" callback in JQuery AJAX call using in PHP

3 Answers 3

4 Comments

Comments

Comments

Your Answer

Hot Network Questions

Collectives™ on Stack Overflow

3 Answers 3

4 Comments

Comments

Comments

Your Answer

Sign up or log in

Post as a guest

Related