Grid throws undefined exception when the server responded with no-content

[Kasun]

I have a grid that is attached to a datasource. When it reads data, the server responses with no-content (when there is no data in the database). 

So the returned data is undefined. But the datasource is still trying to read the total which gives an exception. 

This line throws the error in kendo.all.js file 

  total: function (data) {
                return data.length;
            },

 

I was under the impression that the dataSource ignores any further processing if it does not get any valid data form the server. 

 

[Konstantin Dikov]

Hello Kasun,

It is recommended to pass the same structure in the response, but with empty array for the data if there are no recors. Nevertheless, you could include conditions for checking if "data" exists, before trying to get its length:

total: function (data) {
      if(data){
                return data.length;}
     else{
                return 0;
      }
},

Best Regards,
Konstantin Dikov
Progress Telerik

[Kasun]

Hi, 

The code that I posted is from "kendo.all.js" file. Its not something that I wrote.  

[Konstantin Dikov]

Hello Kasun,

You can define your custom function for retrieving the total in the schema of the dataSource:

• https://docs.telerik.com/kendo-ui/api/javascript/data/datasource/configuration/schema#schema.total

Nevertheless, I would once again recommend to return an empty array instead of null, which will be the correct way for resolving the problem.


Regards,
Konstantin Dikov
Progress Telerik

[Kasun]

Hi Dikov, 

Thats what I ended up doing. I returned an empty array in the Schema. Parse method.