How To Override An Existing Lookup Method: Chain Of Command

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 Today we have a requirement there is one control over there a standard has written a lookup method now we want to overwrite it 


We tried with the event handler but no luck then we got  chance to use register overwirte lookup topology so what we have done


1) Create a extension of form 

2) Write the custom lookup logic

3) then call the particular method on the form level init method


below are the example


[ExtensionOf(formStr(EntAssetWorkOrderTableCreateRelated))]

Final class IHSEntAssetWorkOrderTableCreateRelatedFrm_Extension

{

    void init()

    {

        next init();

       // FromWorkOrderLine.registerOverrideMethod(methodStr(FormDataObject, lookup), formMethodStr(EntAssetWorkOrderTableCreateRelated, ihsFromWorkOrderLineLookup));

    }


 FromWorkOrderLine :- Please note this will be the control name where the standard has written the lookup

=======================================================================

    // this lookup will buy pass the standard look up method written over the form control

    public void ihsFromWorkOrderLineLookup(FormControl _callingControl)

    {

       // FormReferenceControl        referenceControl = sender as FormReferenceControl;

        SysReferenceTableLookup     lookup         = SysReferenceTableLookup::newParameters(tableNum(EntAssetWorkOrderLine), _callingControl);

        Query                       query          = new Query();

        

       // EntAssetWorkOrderTable      fromWorkOrderTable = sender.dataSourceObject().cursor() as EntAssetWorkOrderTable;


        QueryBuildDataSource        qbdsWorkOrderLine = query.addDataSource(tableNum(EntAssetWorkOrderLine));

        QueryBuildRange             qbr               = qbdsWorkOrderLine.addRange(fieldNum(EntAssetWorkOrderLine, WorkOrder));

        QueryBuildRange             qbrIHSManageDisposal    = qbdsWorkOrderLine.addRange(fieldNum(EntAssetWorkOrderLine, IHSManageDisposal));

        

        

        qbdsWorkOrderLine.addOrderByField(fieldNum(EntAssetWorkOrderLine, LineNumber));

        qbr.value(SysQuery::value(fromWorkOrderTable.RecId));

        

        qbrIHSManageDisposal.value(enum2Str(NoYes::Yes));

        lookup.parmQuery(query);

        

        lookup.addLookupfield(fieldNum(EntAssetWorkOrderLine, WorkOrder));

        lookup.addLookupfield(fieldNum(EntAssetWorkOrderLine, LineNumber));

        lookup.addLookupfield(fieldNum(EntAssetWorkOrderLine, Object));

        lookup.addLookupfield(fieldNum(EntAssetWorkOrderLine, JobType));

        

        lookup.performFormLookup();


    }


}

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