Fix hover tooltip showing wrong values when valueMap contains numeric strings

[Copilot]

The hover tooltip in graphical reports was displaying incorrect values when reportOptions.valueMap mapped values to strings that could be interpreted as numbers. For example, if a value was mapped to "8", the tooltip would show 1 instead of 8.

Root Cause

The issue occurred because Chart.js uses category-type axes when valueMap is present, and internally represents data points using array indices rather than the actual mapped values. The tooltip callback was accessing item.parsed.y or item.formattedValue, which returned the chart position (index) instead of the actual data value.

Solution

Modified the tooltip callback in regularGraphs.js to:

1. Check if the dataset has a valuesMap property
2. When present, retrieve the actual data point value using item.dataset.data[item.dataIndex].y instead of the parsed chart position
3. Fall back to the original logic for datasets without valuesMap

Also updated timeSeriesReport.html to include the valuesMap in the dataset configuration so it's accessible to the tooltip callback.

Example

Before fix:

• Value mapped to "8" displays as 1 in tooltip (chart index)

After fix:

• Value mapped to "8" correctly displays as 8 in tooltip (actual value)

The fix maintains backward compatibility - datasets without valuesMap continue to work exactly as before.

Fixes #268.

Warning

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