How to pass params with history.push/Link/Redirect in react-router v4?

First of all, you need not do var r = this; as this in if statement refers to the context of the callback itself which since you are using arrow function refers to the React component context.

According to the docs:

history objects typically have the following properties and methods:

• length – (number) The number of entries in the history stack
• action – (string) The current action (PUSH, REPLACE, or POP)

• location – (object) The current location. May have the following properties:

  • pathname – (string) The path of the URL
  • search – (string) The URL query string
  • hash – (string) The URL hash fragment
  • state – (string) location-specific state that was provided to e.g. push(path, state) when this location was pushed onto the
    stack. Only available in browser and memory history.
• push(path, [state]) – (function) Pushes a new entry onto the history stack
• replace(path, [state]) – (function) Replaces the current entry on the history stack
• go(n) – (function) Moves the pointer in the history stack by n entries
• goBack() – (function) Equivalent to go(-1)
• goForward() – (function) Equivalent to go(1)
• block(prompt) – (function) Prevents navigation

So while navigating you can pass props to the history object like

this.props.history.push({
  pathname: '/template',
  search: '?query=abc',
  state: { detail: response.data }
})

or similarly for the Link component or the Redirect component

<Link to={{
      pathname: '/template',
      search: '?query=abc',
      state: { detail: response.data }
    }}> My Link </Link>

and then in the component which is rendered with /template route, you can access the props passed like

this.props.location.state.detail

Also keep in mind that, when using history or location objects from props you need to connect the component with withRouter.

As per the Docs:

withRouter

You can get access to the history object’s properties and the closest
<Route>'s match via the withRouter higher-order component. withRouter
will re-render its component every time the route changes with the
same props as <Route> render props: { match, location, history }.