Cancel a transport read request mid-flight

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Data Source
Alon
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Alon asked on 03 Oct 2021, 02:02 PM

We have defined a new data source which executes a $.ajax to retrieve some data from a remote server.

return new kendo.data.DataSource({
    pageSize: 10,
    serverPaging: true,
    serverSorting: true,
    serverFiltering: true,
    type: "json",
    sort: {
      field: "name",
      dir: "asc"
    },
    transport: {
      read: function (options) {}....

Now lets consider the following scenario:

The read function is triggered and the call is made to the server but the server is being slow. In the meantime a new read request needs to be made and we want to abort the current read request and issue a new one. 

Using vanilla Jquery we just do something like 

myAjaxRequest.abort()

However, I can not seem to find a similar method to abort a read request (or any request) in the Kendo Data Source Object.

Are you able to offer a solution?

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Dimitar
Telerik team
answered on 06 Oct 2021, 10:52 AM

The Kendo UI DataSource ajax read requests may be aborted through the ajax abort() method, followed by a success or error response from the server. The response notifies the DataSource that the respective request has finished and it may initiate a new request. This Dojo snippet shows the suggested approach. And the following Dojo snippet shows how to save the success function in a variable and then call it after the request is aborted, when clicking the Filter button multiple times in a row. In this example it is important to note the format of the parameters passed to the success function - this is the expected format when the schema is set.

Regards,
Dimitar
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Alon
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commented on 06 Oct 2021, 06:49 PM

Thanks Dimitar.

The Dojo Snippet is very helpful. Is there some where where we can vote on this enhancement? It would be nice to be able to call a method called abortReadRequest() (or something like that) and have the DataSource cancel the request.

Regards,

Alon

Dimitar
Telerik team
commented on 07 Oct 2021, 05:59 AM

I am glad the suggested approach is helpful. A Feature Request item may be proposed at the Kendo UI for jQuery Feedback Portal. It will gain votes and its implementation will be prioritized based on them.

Regards,
Dimitar

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