JavaScript API for Tableau

Could you please clarify the functions described below?

  1. newViz = createTableauViz(containerDiv, url, options);

  2. function listenForMarkSelection() {
    newViz.addEventListener(tableau.TableauEventName.MARKS_SELECTION, handleMarksSelection);
}


  3. function handleMarksSelection(marksEvent) {
  return marksEvent.getMarksAsync().then(displaySelectedMarks);
}

  4. function displaySelectedMarks(marks) {

    var htmlOutput = "";

            for (var index = 0; index < marks.length; index++) {
            var pairs = marks[index].getPairs();
            htmlOutput += "<b>Mark " + index + ":</b><ul>";

            for (var pairIndex = 0; pairIndex < pairs.length; pairIndex++) {
                var pair = pairs[pairIndex];
                htmlOutput += "<li><b>Field Name:</b> " + pair.fieldName;
                htmlOutput += "<br/><b>Value:</b> " + pair.formattedValue + "</li>";
            }


        }


    }
javascriptclasstableau-api

Answer №1

  1. This particular function is responsible for monitoring the chosen marker.

  2. Here, the selection is passed to reportSelectedMarks.

  3. It retrieves the markers and stores them in an HTML file within a '<li>' tag. The fieldname is likely a String, with the value depending on the context.

In essence, these functions are handy for dynamically displaying a selected mark on a graph or similar visualization, along with printing a field name and corresponding value.

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