Handling json null

[dario]

Hi all
I'm using a Store with a Json reader to get some data from the backend. Everything works fine but I get an error when some of this data has a null value.
Here's my data

{"licences":[{"Id":2,"LicenseKey":"123456","Point":null,"Owner":{"Id":1,"Name":"Witbit"}, "Mac":null,"Active":false},
{"Id":3,"LicenseKey":"789013","Point":null,"Owner":null, "Mac":null,"Active":false}]} 

and corresponding reader:

this.DS  = new Ext.data.Store(
{
    reader: new Ext.data.JsonReader(
            { 
                root: "licences",
                fields: [ "Id", "LicenseKey", {name:"Owner_Name", mapping:"Owner.Name"}, "Point",  "Mac", "Active" ] 
            })
}); 

When I load the data I get an error because the second license object has no owner (=null) and thus Owner.Name is not an object.
I already found a way to make my app work but I wonder if there's way to handle data with null value...for example the reader should check if an object is null before trying to parse its members?
Thanks in advance

[evant]

Pretty much, you'd have to implement some kind of custom parser with try catch blocks.

[Condor]

Try:

{name:"Owner_Name", mapping:"Owner", convert: function(v) {return v ? v.Name : null;}}

[dario]

Thanks Condor, that perfectly worked!