Wednesday, January 23, 2019

bugs in SysLookupMultiSelectGrid class and form

You can find a lot of example about how to support multiple selection lookups. AX 2012/D365 provide us with SysLookupMultiSelectGrid class and form to implement such scenarios.

There are two bugs however still existing in the standard code.

SysLookupMultiSelectGrid class, method lookup() must be as follows in order to refresh Query in case QueryRun is given.

// the standard method does not update the query in case if queryrun is given
public static void wblLookup(Query _query, FormStringControl _ctrlIds, FormStringControl _ctrlStrs, container _selectField, queryRun _queryRun = null)
    SysLookupMultiSelectGrid    lookupMS = new SysLookupMultiSelectGrid();

    // Begin: Alexey Voytsekhovskiy
    // End: Alexey Voytsekhovskiy

SysLookupMultiSelectGrid form, method executeQuery() on common data source must be as follows in order not to consider referenced data sources, which may come with a given query.

public void executeQuery()
    QueryRun qr;
    Query lookupMultiSelectQueryCopy = new Query(lookupMS.parmQuery());
    FormRun formRun;
    FormDataSource formDataSource;
    int dsCount, i = 1;
    Common formDataSourceCursor, queryRunCursor;

    // Always use the query defined on the SysLookupMultiSelectGrid class. Note that a copy is used
    // so that any modifications made to the Query by the Form at runtime aren't fed back through
    // the next time the lookup is presented to the user. (The Query is used to define which fields
    // are present on the Form during lookup construction. Therefore, if any fields are added at runtime
    // by the Forms engine, duplicated or non-original-Query defined fields may be presented on the
    // 2nd or later presentations of the lookup if a copy isn't used.)

    // check if user has set any queryrun. If yes, that means the cursors are set by user explicitly,
    // usually the case where query contains tmp tables and needs to be populated.
    qr = lookupMS.parmQueryRun();
        formRun = this.formRun();
        dsCount = formRun.dataSourceCount();

        // get data source from query run, get the cursor and set it on the form data source cursor.
        for(i = 1; i<=dsCount; i++)
            formDataSource = formRun.dataSource(i);
                            // Begin: Alexey Voytsekhovskiy
                            // we don't need a reference data source here!
                            && !formDataSource.isReferenceDataSource()
                            // End: Alexey Voytsekhovskiy
                // get form data source cursor and set the queryrun cursor as data on it.
                formDataSourceCursor = formDataSource.cursor();
                queryRunCursor = qr.get(formDataSourceCursor.TableId);
                    if(queryRunCursor.isTempDb() || queryRunCursor.isTmp())



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