OpenEdge Development: Mobile Applications - Product ...

Client JavaScript code: Create
Accessing built-in CRUD operations
The following example illustrates calling add( ) on a table reference in the JSDO to
create a record:
/* subscribe to event */
dsOrderEntry.ttCustomer.subscribe('afterCreate', onAfterCreate);
/* some code that would add a record and save it */
var jsrecord = dsOrderEntry.ttCustomer.add( {State : 'MA'} );
dsOrderEntry.saveChanges();
function onAfterCreate (jsdo , record , success , request ) {
if (success) {
/* for example, get the values from the record for redisplaying */
var myField = record.data.myField;
}
else {
if (request.response && request.response._errors &&
request.response._errors.length > 0){
var lenErrors = request.response._errors.length;
for (var idxError=0; idxError < lenErrors; idxError++) {
var errorEntry = request.response._errors[idxError];
var errorMsg = errorEntry._errorMsg;
var errorNum = errorEntry._errorNum;
/* handle error */
}
}
}
};
Notice that the sample code:
• Subscribes an event-handler function, onAfterCreate, to the afterCreate event
to enable error-checking and manipulation of the new record.
• Adds the record to the ttCustomer table, with an initial value of MA for the State
field. (The table reference could be omitted if ttCustomer were the only
temp-table in the dsOrderEntry ProDataSet.)
• Calls saveChanges( ) to execute CreateOrderEntry( ) on the AppServer and
thereby synchronize the content of local storage with the database.
Update operation
To modify an existing record in local storage on the client, you call the assign( )
method. The values of fields to be updated are specified in an object passed to the
method.
The assign( ) method can be called on either of the following:
• A table reference on the JSDO. When called on a table reference, as in the
example below, assign( ) operates on the working record for that table.
• A specific JSRecord object.
OpenEdge ® Development: Mobile Applications 109