ClientDataSource update sends several requests

[Omar]

Hi, I'm using ClientDataSource connected to a webservice and using OnCustomParameter to customize the data request.

I noticed that if I changed several fields for a data item and updated the clientdatasource, then for each field modified a request is sent to the webservice.

Each request has a single field changed from the previous one.

Suppose I have in a dataitem 4 fields (a,b,c,d) with their initial value to 1,

now I need to modify them to {a : 2, b:2, c:2, d:2}

when I update the clientdatasource the following requests are sent:

request1: {a:2,b:1,c:1,d:1}

request2: {a:2,b:2,c:1,d:1}

request3: {a:2,b:2,c:2,d:1}

request4: {a:2,b:2,c:2,d:2}

Is there a way to only send the final request? i.e. I want to get all the data updated before syncing.

[Konstantin Dikov]

Hello Omar,

Can you please share the code that you are using for updating the item and elaborate on the exact scenario. Using the update method as demonstrated in the following online demo should initiate only one request for the update:

• http://demos.telerik.com/aspnet-ajax/clientdatasource/functionality/data-editing/defaultcs.aspx

Looking forward to your reply.


Regards,
Konstantin Dikov
Telerik by Progress

[Omar]

The javascript code for updating the datasource: (dropdownlist, numerictextbox, numerictextbox,textbox)

var data = {
    EmergencyCategoryID: emergency_cat.get_selectedItem().get_value(),
    Injuries: emergency_inj.get_value(),
    Casualties: emergency_cas.get_value(),
    Description: emergency_desc.get_value(),
};

try {
    emergencyClientDataSource.update(data,emergency_data.ID);
} catch (e) {
    console.log(e);
}

 

The javascript code for custom paramter:

function EmergencyClientDataSource_OnCustomParameter(sender, args) {
    console.log("Custom Emergency parameter: ", sender, args);
    var data = args.get_data();
    if (!data) {
        data = {};
    }

    data['username'] = window.sessionStorage["username"];
    switch (args.get_type()) {
        case "update":
            var update_data = {
                username: data.username,
                emergencyid: data.ID,
                description: data.Description,
                categoryid: data.EmergencyCategoryID,
                injuries: data.Injuries,
                casualties: data.Casualties,
            }
            args.set_parameterFormat(update_data);
            break;
    }
    console.log(data, args.get_parameterFormat());
};

 

RadClientDataSource:

<telerik:RadClientDataSource ID="EmergencyClientDataSource" runat="server" AutoSync="true">
    <ClientEvents OnDataParse="EmergencyClientDataSource_OnDataParse" OnChange="EmergencyClientDataSource_OnChange"
        OnCustomParameter="EmergencyClientDataSource_OnCustomParameter"/>
    <Schema DataName="Result" ResponseType="JSON" ErrorsName="ErrorMessage">
        <Model ID="ID">
            <telerik:ClientDataSourceModelField FieldName="ID" DataType="String" Nullable="true" Editable="False" />
            <telerik:ClientDataSourceModelField FieldName="EmergencyCategoryID" DataType="String" Nullable="false" Editable="False" />
            <telerik:ClientDataSourceModelField FieldName="Description" DataType="String" />
            <telerik:ClientDataSourceModelField FieldName="Casualties" DataType="Number" />
            <telerik:ClientDataSourceModelField FieldName="Injuries" DataType="Number" />
        </Model>
    </Schema>
</telerik:RadClientDataSource>

 

After I execute the update I get the following in the console:

emergencyid: 3287e04d-342c-411d-b95d-397af479b9e2 injuries: 5 casualties: 100 description: qwertyuhgfdsertyu categroyid: 81a93455-a9dc-4596-b4e4-2e64b4411d38

emergencyid: 3287e04d-342c-411d-b95d-397af479b9e2 injuries: 5 casualties: 5 description: qwertyuhgfdsertyu categroyid: 81a93455-a9dc-4596-b4e4-2e64b4411d38

emergencyid: 3287e04d-342c-411d-b95d-397af479b9e2 injuries: 5 casualties: 5 description: qwerty categroyid: 81a93455-a9dc-4596-b4e4-2e64b4411d38

response Object {ErrorMessage: null, IsSuccessful: true, Result: Object}
response Object {ErrorMessage: null, IsSuccessful: true, Result: Object}
response Object {ErrorMessage: null, IsSuccessful: true, Result: Object}

As you can see only as single field is modified at a time, and three requests are generated!

 

[Konstantin Dikov]

Hello Omar,

Can you please try to set the AutoSync property of the RadClientDataSource to "false" and call the sync method manually after calling the update method?

Please give this a try and let me know if the issue is resolved.


Regards,
Konstantin Dikov
Telerik by Progress

[Omar]

Hi Konstantin,

Thank you for your repsonse. I removed autosync and used sync and it worked.