Function index

src/core/core.interaction.js:269–294

* Returns items at the same index. If the options.intersect parameter is true, we only return items if we intersect something * If the options.intersect mode is false, we find the nearest item and return the items at the same index as that item * @function Chart.Interaction.modes.index * @s

(chart, e, options, useFinalPosition)

		 * @return {InteractionItem[]} - items that are found
		 */
    index(chart, e, options, useFinalPosition) {
      const position = getRelativePosition(e, chart);
      // Default axis for index mode is 'x' to match old behaviour
      const axis = options.axis || 'x';
      const includeInvisible = options.includeInvisible || false;
      const items = options.intersect
        ? getIntersectItems(chart, position, axis, useFinalPosition, includeInvisible)
        : getNearestItems(chart, position, axis, false, useFinalPosition, includeInvisible);
      const elements = [];

      if (!items.length) {
        return [];
      }

      chart.getSortedVisibleDatasetMetas().forEach((meta) => {
        const index = items[0].index;
        const element = meta.data[index];

        // don't count items that are skipped (null data)
        if (element && !element.skip) {
          elements.push({element, datasetIndex: meta.index, index});
        }
      });

      return elements;
    },

    /**
		 * Returns items in the same dataset. If the options.intersect parameter is true, we only return items if we intersect something