[React] Create a Query Parameter Modal Route with React Router
Routes are some times better served as a modal. If you have a modal (like a login modal) that needs to be routeable and appear on all pages you may need to use query params. Will explore how to render a route all the time and use query params to control when it's content renders.
Modal should be created as a 'Portal':
<body>
<noscript>You need to enable JavaScript to run this app.</noscript>
<div id="root"></div>
<div id="modal_root"></div>
</body>
import React, { Component } from "react";
import { createPortal } from "react-dom";
const modalStyle = {
position: "fixed",
left: 0,
top: 0,
bottom: 0,
right: 0,
backgroundColor: "rgba(0,0,0,.2)",
color: "#FFF",
fontSize: "40px",
};
export default class Modal extends Component {
render() {
return createPortal(
<div style={modalStyle} onClick={this.props.onClick}>
{this.props.children}
</div>,
document.getElementById("modal_root"),
);
}
}
If we want to show the Modal everywhere in the page, we need to declear the Router outside 'Switch' component:
import React from "react";
import ReactDOM from "react-dom";
import "./index.css"; import { BrowserRouter, Switch, Route } from "react-router-dom";
import HomePage from "./pages/home";
import ProfilePage from "./pages/profile";
import Login from "./pages/login"; const routes = (
<BrowserRouter>
<Switch>
<Route exact path="/" component={HomePage} />
<Route path="/profile" component={ProfilePage} />
</Switch>
<Route path="/" component={Login} />
</BrowserRouter>
); ReactDOM.render(routes, document.getElementById("root"));
For all the routes re-render, Login component will be shown.
Inside Login componnet, control the component show / hide by query param:
import React, { Component } from "react";
import Modal from "./modal";
export default class LoginPage extends Component {
render() {
let params = new URLSearchParams(this.props.location.search);
return (
params.get("login") && (
<Modal
onClick={() => {
this.props.history.push(this.props.location.pathname);
}}
>
<div
style={{
display: "flex",
alignItems: "center",
justifyContent: "center",
height: "100%",
}}
>
Login modal
</div>
</Modal>
)
);
}
}
Using:
<Link to={{ pathname: "/", search: "?login=true" }}>Login</Link>
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