Exporting data from a custom visual using powerbi-client javascript library

Hello Team,

I have custom visual which is built on a HTMLTextAreaElement. The use case is, user should be able to enter any value in this custom visual and using powerbi-client javascript library I need to read the value from this custom visual.

var inputTextCustom = visuals.filter(function (visual) {
return visual.type === "inputTextXXXXXXX" && visual.name === "YYYYYYYYYYY";
})[0];

I am able to access the custom visual using the above code but I am unable to read the value from it.

I have tried using the below code to extract the data from the custom visual, but it does not work.

inputTextCustom.exportData(models.ExportDataType.Underlying, 500).then(handleExportData);

function handleExportData(result) {
   const resultData = parseData(result.data);
   console.log(resultData);
}

function parseData(data) {
   const result = [];
   data.split("\n").forEach(function (row) {
   if (!row) {
      return;
   }
   const rowArray = [];
   row.split(",").forEach(function (cell) {
   rowArray.push(cell);
   });

   result.push(rowArray);
});
return result;
}

Can someone please guide me with some sample code on how should I go about extracting the data from this custom visual?

Thank you!