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How to write lookup for selecting multiple options

Before Writing code we have to create string in form Right click on group and now go to string add

Name it diffrent or we can add lable later

create lookup method override

First set the ReplaceOnLookup property of the control to “NO”

Second set the control Autodeclartion property to “Yes”


[Control("String")]

    class FormStringControl1

    {

        /// <summary>

        ///

        /// </summary>

        public void lookup()

        {

            SysTableLookup sysTableLookup = SysTableLookup::newParameters(tablenum(Food), this);

            Query query = new Query();

            QueryBuildDataSource qbds;

            


            sysTableLookup.addLookupField(fieldnum(Food,FoodName  ), true);

            qbds = query.addDataSource(tablenum(Food));


            this.setSelection(strlen(this.text()),strlen(this.text()));

            FormStringControl1.text(FormStringControl1.valueStr() + ',');


            sysTableLookup.parmQuery(query);


            sysTableLookup.performFormLookup();

            super();


        }


        /// <summary>

        ///

        /// </summary>

        /// <returns></returns>

        public boolean modified()

        {

            boolean ret;

        

            ret = super();

            Box::info(strFmt("%1",FormStringControl1.text()));


            if(FormStringControl1.text() != '') //Check the combo box has value or not


            {


                SysQuery::findOrCreateRange( Food_ds.query().dataSourceTable( tableNum( Food )),


fieldNum( Food,FoodName  ) ).value( SysQuery::value( FormStringControl1.text() ) );


            }


            

            else


            {


                SysQuery::findOrCreateRange( Food_ds.query().dataSourceTable( tableNum( Food )),


fieldNum( Food,FoodName   ) ).value( SysQuery::valueUnlimited() );


            }


        

            Food_ds.executeQuery();

            return ret;

        }


    }


    [Control("String")]

    class FormStringControl2

    {

        /// <summary>

        ///

        /// </summary>

        public void textChange()

        {

            super();

            this.modified();

        }


        /// <summary>

        ///

        /// </summary>

        /// <returns></returns>

        public boolean modified()

        {

            boolean ret;

        

            ret = super();


            str nameFilter;


            nameFilter = '*'+this.text()+'*';

            Food_ds.filter(fieldnum(Food,FoodType  ),nameFilter);

        

            return ret;

        }


        /// <summary>

        ///

        /// </summary>

        public void enter()

        {

            super();


            this.setSelection(

                strlen(this.text()),

                strlen(this.text()));

        }


    }

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