error event not thrown when ready state 0

fedeolto

Hello,
I'm using datatables for server side processing and I would like following scenario to happen:

• user changes page but he has no Internet connectivity so the ajax request remains in readystate 0 (but don't hang forever, I see that jQuery throws an error in the console immediatly)
• I can listen to this error and show a message to the user

I saw in the docs about this event https://datatables.net/reference/event/error and works like a charm when the connection ends with an error (for example 500 from the server), but it is not raised when the request is stalled

I see that this event is fired https://datatables.net/reference/event/xhr but I would like to know if there is a better way than intercepting every single request and why error event is not raised

allan

How would you do that with just plain jQuery? Have you solved that aspect elsewhere in your code?

Allan

fedeolto

I use offline js in the other points where I need to detect the absence of connectivity.
For what it concerns the reason of my question, I just saw that it's possible to use the error option inside the ajax call and it does the trick, so sorry for not seeing it before.
I paste an example here in case someone hits this question in google

$('#myTable').DataTable({
serverSide: true,
ajax: {
url: 'http://a.sweet.url',
error: function (jqXHR, textStatus, errorThrown) {
aCustomErrorHandler.showMyLovelyError(jqXHR) // <--- this function invokes offline.js api and eventually detect if user lost Internet connection
}
},
columns: [
{data: 'bla', title: 'bla'},
{data: 'bla', title: 'bla'},
{data: 'bla', title: 'bla'},
{data: 'bla', title: 'bla'},
. . .
],
order: [[3, 'desc']],
. . .
]
})

allan

Thanks for posting back with your solution.

Its also worth noting that you can use ajax as a function which will completely override the DataTables default Ajax and replace it with your own.

Allan