function upgradeElementInternal()

in website/css/mdl/material.js [187:238]
41 lines of code
12 McCabe index (conditional complexity)

  function upgradeElementInternal(element, optJsClass) {
    // Verify argument type.
    if (!(typeof element === 'object' && element instanceof Element)) {
      throw new Error('Invalid argument provided to upgrade MDL element.');
    }
    var upgradedList = getUpgradedListOfElement_(element);
    var classesToUpgrade = [];
    // If jsClass is not provided scan the registered components to find the
    // ones matching the element's CSS classList.
    if (!optJsClass) {
      var classList = element.classList;
      registeredComponents_.forEach(function(component) {
        // Match CSS & Not to be upgraded & Not upgraded.
        if (classList.contains(component.cssClass) &&
            classesToUpgrade.indexOf(component) === -1 &&
            !isElementUpgraded_(element, component.className)) {
          classesToUpgrade.push(component);
        }
      });
    } else if (!isElementUpgraded_(element, optJsClass)) {
      classesToUpgrade.push(findRegisteredClass_(optJsClass));
    }

    // Upgrade the element for each classes.
    for (var i = 0, n = classesToUpgrade.length, registeredClass; i < n; i++) {
      registeredClass = classesToUpgrade[i];
      if (registeredClass) {
        // Mark element as upgraded.
        upgradedList.push(registeredClass.className);
        element.setAttribute('data-upgraded', upgradedList.join(','));
        var instance = new registeredClass.classConstructor(element);
        instance[componentConfigProperty_] = registeredClass;
        createdComponents_.push(instance);
        // Call any callbacks the user has registered with this component type.
        for (var j = 0, m = registeredClass.callbacks.length; j < m; j++) {
          registeredClass.callbacks[j](element);
        }

        if (registeredClass.widget) {
          // Assign per element instance for control over API
          element[registeredClass.className] = instance;
        }
      } else {
        throw new Error(
          'Unable to find a registered component for the given class.');
      }

      var ev = document.createEvent('Events');
      ev.initEvent('mdl-componentupgraded', true, true);
      element.dispatchEvent(ev);
    }
  }