Method registerMixin

src/core/a-node.js:240–263

* From mixin id, add mixin element to `mixinEls`. * * @param {string} mixinId - ID of the mixin to register.

(mixinId)

   * @param {string} mixinId - ID of the mixin to register.
   */
  registerMixin (mixinId) {
    var compositedMixinIds;
    var i;
    var mixin;
    var mixinEl = document.getElementById(mixinId);

    if (!mixinEl) {
      warn('No mixin was found with id `%s`', mixinId);
      return;
    }

    // Register composited mixins (if mixin has mixins).
    mixin = mixinEl.getAttribute('mixin');
    if (mixin) {
      compositedMixinIds = utils.split(mixin.trim(), /\s+/);
      for (i = 0; i < compositedMixinIds.length; i++) {
        this.registerMixin(compositedMixinIds[i]);
      }
    }

    // Register mixin.
    this.computedMixinStr = this.computedMixinStr + ' ' + mixinEl.id;
    this.mixinEls.push(mixinEl);
  }

  setAttribute (attr, newValue) {
    if (attr === 'mixin') { this.updateMixins(newValue); }