Method buildOrUpdateControllers

src/core/core.controller.js:415–455

()

  }

  buildOrUpdateControllers() {
    const newControllers = [];
    const datasets = this.data.datasets;
    let i, ilen;

    this._removeUnreferencedMetasets();

    for (i = 0, ilen = datasets.length; i < ilen; i++) {
      const dataset = datasets[i];
      let meta = this.getDatasetMeta(i);
      const type = dataset.type || this.config.type;

      if (meta.type && meta.type !== type) {
        this._destroyDatasetMeta(i);
        meta = this.getDatasetMeta(i);
      }
      meta.type = type;
      meta.indexAxis = dataset.indexAxis || getIndexAxis(type, this.options);
      meta.order = dataset.order || 0;
      meta.index = i;
      meta.label = class="st">'' + dataset.label;
      meta.visible = this.isDatasetVisible(i);

      if (meta.controller) {
        meta.controller.updateIndex(i);
        meta.controller.linkScales();
      } else {
        const ControllerClass = registry.getController(type);
        const {datasetElementType, dataElementType} = defaults.datasets[type];
        Object.assign(ControllerClass, {
          dataElementType: registry.getElement(dataElementType),
          datasetElementType: datasetElementType && registry.getElement(datasetElementType)
        });
        meta.controller = new ControllerClass(this, i);
        newControllers.push(meta.controller);
      }
    }

    this._updateMetasets();
    return newControllers;
  }

  /**
	 * Reset the elements of all datasets