React (also known as React.js or ReactJS) supports one-way data binding, whereas Angularjs supports two-way data binding.

Sometimes we come across a situation to update parent component state from child component. React does not recommended to update parent state from child component. If any component changes the state value, then those components are regarded as impure component.

In the following demo, we have a parent component (App.js)  with 3 different buttons which will display content in reusable modal. Here, States are maintained in parent component (App.js) and child component (ModalDialog.js) update the parent state (i.e Closing Dialog Method) by calling parent method through props.