submitting custom parameters in a Datasource using an everlive data type

[Matt]

Morning!  we have a cloud data table called InAppMessages.  i'm trying to submit some custom parameters from my client app when it reads its datasource attached to the everlive table so i can do some cloud data magic in the 'after read' functions using those parameters.

 

i haven't found any way to insert the custom parameters successfully into the header of my datasource.  i've tried making a transport: read function that uses ajax call per some other postings but i get a access key not valid error.  i tried modifying the header of the datasource using a custom transport read but just fails to run (errors in the app telling me the datasource doesn't exist).  i could post a bunch of code samples but i tried some significantly different approaches.  i figure this must be a well understood process but the documentation on the site did not work for me nor did any in postings.  i wanted to start this thread to get some recommended processes.

 

here's the first way i tried and what i thought should work:

custParams = {

"Age":36,
            "MemLevel":"Family"​

 var messageCenterDatasource = new kendo.data.DataSource({
            type: 'everlive',
            transport: {
                read: {

                   beforeSend: function (xhr) {
                                xhr.setRequestHeader("X-Everlive-​Custom-Parameters",  JSON.stringify(​custParams));
                   },
            },
            schema: {
                model: { id: Everlive.idField},
            },
            serverSorting: true,
            sort: {field: 'CreatedAt', dir: 'asc' },
            change: function(e) {
                //do stuff        

            }
     });

 

[Matt]

whoops...posted before i finished doctoring the code.  there is a missing }; at the end of the custParams section up top.  i did close the variable off...just didn't in this sample by accident.

 

any help is very welcome!  i've burned a few hours digging through instructions that aren't quite right and sometimes very misleading.

 

Matt

[Vasil]

Hi Matt,

We have updated the way the Backend Services Datasource works. If you wish to add headers to a request operation (read, create, update, destroy) you can do it like so (notice the headers option):

custParams = {
    "Age":36,
    "MemLevel":"Family"​
};
 var messageCenterDatasource = new kendo.data.DataSource({
            type: 'everlive',
            transport: {
                read: {
                   headers: {
                       "X-Everlive-​Custom-Parameters",  JSON.stringify(​custParams);
                   },
            },
            schema: {
                model: { id: Everlive.idField},
            },
            serverSorting: true,
            sort: {field: 'CreatedAt', dir: 'asc' },
            change: function(e) {
                //do stuff
            }
     });

More information regarding the custom headers can be found in the official documentation:
http://docs.telerik.com/platform/backend-services/javascript/integrations/kendoui/kendoui-uidata-source

Please let me know if there is anything else I can help you with.

Kind regards,
Vasil
Telerik

 

 

[Matt]

works like a charm.  thanks for updating the documentation, too.

 

matt

[Vasil]

Hi Matt,

I am happy to hear that you've got this working.

Let us know if you have further questions.

Regards,
Vasil
Telerik