gerogiad3

//listen for change event, call menuChanged func
dropDown.on("change", menuChanged });

function menuChanged() {
  
    var selectedValue = d3.event.target.value;  
         //get the name of the selected option from the change event object

    countryData.indicators.forEach(function (d) { 
        //loop through your source data, however it happens to be organized (this is just an example)

        if (selectedValue === d.name){
        //if the dropdown value matches the indicator name

            console.log(d);
            updateMap(d.name);
            //call whatever function draws the #map according to whatever indicator
            
        };
    })
}