My kendo Grid does not display fields by calling webserver - kendo-ui

Question

I need help about a kendo grid,
I call a webservice to fill a datasource of the grid. It seems to work fine, but the data are not displayed in the grid.
The webservice call returns 7 records, and in the grid there are 7 rows, but they are empty.
this is the code:
var mime_charset = "application/json; charset=utf-8";
var serverSelectReturnsJSONString = true;
var model_definition = {
id: "ID",
fields: {
customer_id: { type: "number" },
name_customer: { type: "string" },
address_customer: { type: "string" }
}
}
$(document).ready(function () {
var ds = createJSONDataSource();
$("#grid").kendoGrid({
selectable: true,
theme: "metro",
dataSource: ds,
scrollable: true,
pageable: true,
// height: 300,
toolbar: ["save", "cancel"],
columns: ["ID", "Nome", "Indirizzo"],
editable: true
});
ds.read();
});
and this is the function for filling the datasource:
function createJSONDataSource() {
var dataSource = new kendo.data.DataSource({
severFiltering: true,
serverPaging: true,
PageSize: 15,
//batch: true,
transport: {
autoSync: true,
read: {
type: "POST",
url: "WebServices/GetDataTest.asmx/getCustList",
dataType: "json",
contentType: mime_charset
}
},
schema: {
data: function (data) {
if (data) {
if (serverSelectReturnsJSONString)
return $.parseJSON(data.d);
else
return data.d;
}
},
total: function (result) {
if (!result) return 0;
var xxx = result.d;
if (xxx == null) {
return result.length || 0;
}
if (result.d) {
if (serverSelectReturnsJSONString) {
var data = $.parseJSON(result.d);
return data.length || 0;
}
else {
return result.d.TotalRecords || result.d.length || result.length || 0;
}
}
},
model: model_definition
}
});
dataSource.options.schema.parse = function (dataJ) {
var data;
data = $.parseJSON(dataJ.d);
if (data) {
$.each(data, function (i, val) {
$.each(model_definition.fields, function (j, col) {
if (col.type == "date" || col.type == "datetime") {
val[j] = toDate(val[j]);
}
})
});
var ret = { d: JSON.stringify(data) };
return ret;
}
}
dataSource.reader.parse = dataSource.options.schema.parse;
return dataSource;
}

Answer 1

Your columns definition is not correct, it is an array but of objects (not strings). Check documentation here. If should be something like:
columns: [
{ field: "ID" },
{ field: "Nome" },
{ field: " "Indirizzo" }
],