binding.parentValue

The example below shows creating a new binding and then reading the parent’s value with parentValue:

import Bind from "can-bind";
import DefineMap from "can-define/map/map";
import value from "can-value";

const parentMap = new DefineMap({parentProp: "parent value"});
const parent = value.bind(parentMap, "parentProp");

const childMap = new DefineMap({childProp: "child value"});
const child = value.bind(childMap, "childProp");

const binding = new Bind({
  child: child,
  parent: parent
});

binding.parentValue; // is "parent value"

Using parentValue is the equivalent of using can-reflect to get the value:

import canReflect from "can-reflect";

const parentValue = canReflect.getValue(parent);

The parentValue property is most commonly used with startParent; see its documentation for more details.