Popup showing values that are not defined

I've encountered an issue with tooltips on my bar graph. The tooltips should display the values of boarding and alightings corresponding to each stopname column, but I'm seeing undefined values like this

Below is my code snippet:

<!DOCTYPE html>
    <meta charset="utf-8">
    <style>

        /* Styles for the body, axis, bars, etc. */
  
    </style>
    <body>
    <script src="http://d3js.org/d3.v3.min.js"></script>
    <script src="http://labratrevenge.com/d3-tip/javascripts/d3.tip.v0.6.3.js"></script>
    <script>

        /* Script logic for creating the visualization */

    </script>
    </body>
    

Sample TSV file contents:

stopname    maxboardings    meanboardings   minboardings    varboardings    maxalightings   meanalightings  minalightings   varalightings   maxload meanload    minload varload noofbuses
    The Boardwalk Terminal (3908)   7   2.571428571 0   6.952380952 0   0   0   0   7   2.571428571 0   6.952380952 7
    Highview / Sugar Maple (3329)   2   0.333333333 0   0.666666667 1   0.166666667 0   0.166666667 6   3   0   6.4 6
    Highview / Highview Pl (3330)   0   0   0   0   1   0.166666667 0   0.166666667 5   2.833333333 0   5.366666667 6
    ....
    

Your assistance in resolving this matter would be greatly appreciated! Thank you.

Answer №1

When you encounter an undefined error, it is likely due to using a value that has not been defined for generating tooltip text.

Within your html function, the data object linked to d for each rectangle or bar is structured like this:

{name: "meanlightings", value: <some_value>}

This structure does not include the stopname property and only contains a value for one of the fields in the original dataset.

To resolve this issue, you should adjust the html callback as follows:

.html(function(d) {
  return "<strong>" + d.name + " :</strong> <span style='color:red'>" + d.value + "</span>";
})

If you wish to display additional properties, you will need to update the data being bound to the rectangles.

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