Lab 21: Route Parameters

Objectives

  • Navigate to a route with a parameter

Steps

Navigate to a route with a parameter

  1. Add a find method to projectAPI to return a single Project by id

    src\projects\projectAPI.js

    const projectAPI = {
    ...
    + find(id) {
    + return fetch(`${url}/${id}`)
    + .then(checkStatus)
    + .then(parseJSON);
    + },
    +
    ...
    };

  2. Create the files below and add the code for these pre-built components we will use in this lab. Take a moment to review the code in them.

    src\projects\ProjectDetail.js

    import React from 'react';
    import { Project } from './Project';
    interface ProjectDetailProps {
    project: Project;
    }
    export default function ProjectDetail({ project }) {
    return (
    <div className="row">
    <div className="col-sm-6">
    <div className="card large">
    <img
    className="rounded"
    src={project.imageUrl}
    alt={project.name}
    />
    <section className="section dark">
    <h3 className="strong">
    <strong>{project.name}</strong>
    </h3>
    <p>{project.description}</p>
    <p>Budget : {project.budget}</p>
    <p>Signed: {project.contractSignedOn.toLocaleDateString()}</p>
    <p>
    <mark className="active">
    {' '}
    {project.isActive ? 'active' : 'inactive'}
    </mark>
    </p>
    </section>
    </div>
    </div>
    </div>
    );
    }

    src\projects\ProjectPage.js

    import React, { useEffect, useState } from 'react';
    import { projectAPI } from './projectAPI';
    import ProjectDetail from './ProjectDetail';
    import { Project } from './Project';
    import { useParams } from 'react-router-dom';
    function ProjectPage(props: any) {
    const [loading, setLoading] = useState(false);
    const [project, setProject] = (useState < Project) | (null > null);
    const [error, setError] = (useState < string) | (null > null);
    const params = useParams();
    const id = Number(params.id);
    useEffect(() => {
    setLoading(true);
    projectAPI
    .find(id)
    .then((data) => {
    setProject(data);
    setLoading(false);
    })
    .catch((e) => {
    setError(e);
    setLoading(false);
    });
    }, [id]);
    return (
    <div>
    <>
    <h1>Project Detail</h1>
    {loading && (
    <div className="center-page">
    <span className="spinner primary"></span>
    <p>Loading...</p>
    </div>
    )}
    {error && (
    <div className="row">
    <div className="card large error">
    <section>
    <p>
    <span className="icon-alert inverse "></span> {error}
    </p>
    </section>
    </div>
    </div>
    )}
    {project && <ProjectDetail project={project} />}
    </>
    </div>
    );
    }
    export default ProjectPage;

  3. Add a route to display the ProjectPage (notice that we now have a ProjectPage and a ProjectsPage so be careful you are in the correct file).

    src\App.tsx

    import ProjectsPage from './projects/ProjectsPage';
    + import ProjectPage from './projects/ProjectPage';
    function App() {
    return (
    <Router>
    <header className="sticky">
    <span className="logo">
    <img src="/assets/logo-3.svg" alt="logo" width="49" height="99" />
    </span>
    <NavLink to="/" className="button rounded">
    <span className="icon-home"></span>
    Home
    </NavLink>
    <NavLink to="/projects/" className="button rounded">
    Projects
    </NavLink>
    </header>
    <div className="container">
    <Routes>
    <Route path="/" element={<HomePage />} />
    <Route path="/projects" element={<ProjectsPage /> } />
    + <Route path="/projects/:id" element={<ProjectPage />} />
    </Routes>
    </div>
    </Router>
    );
    }

  4. Add a route to display the ProjectPage (notice that we now have a ProjectPage and a ProjectsPage so be careful you are in the correct file).

    src\App.js

    import ProjectsPage from './projects/ProjectsPage';
    + import ProjectPage from './projects/ProjectPage';
    function App() {
    return (
    <Router>
    <header className="sticky">
    <span className="logo">
    <img src="/assets/logo-3.svg" alt="logo" width="49" height="99" />
    </span>
    <NavLink to="/" className="button rounded">
    <span className="icon-home"></span>
    Home
    </NavLink>
    <NavLink to="/projects/" className="button rounded">
    Projects
    </NavLink>
    </header>
    <div className="container">
    <Routes>
    <Route path="/" component={HomePage} />
    <Route path="/projects" component={ProjectsPage} />
    + <Route path="/projects/:id" element={<ProjectPage />} />
    </Routes>
    </div>
    </Router>
    );
    }

  5. Make the name and description clickable by adding a <Link /> component around them.

    src\projects\ProjectCard.js

    + import { Link } from 'react-router-dom';
    ...
    <section className="section dark">
    + <Link to={'/projects/' + project.id}>
    <h5 className="strong">
    <strong>{project.name}</strong>
    </h5>
    <p>{formatDescription(project.description)}</p>
    <p>Budget : {project.budget.toLocaleString()}</p>
    + </Link>
    <button
    type="button"
    className=" bordered"
    onClick={() => {
    handleEditClick(project);
    }}
    >
    <span className="icon-edit "></span>
    Edit
    </button>
    </section>
    ...

  6. Verify the new route works by the following these steps:

    1. Visit the root of the site: http://localhost:3000/ and refresh the page in your browser.
    2. Click on Projects in the navigation.
    3. Verify you are taken to the /projects route and the ProjectsPage displays.
    4. Click on the name or description in any of the project cards .
    5. Verify you are taken to the /projects/1 route and the ProjectPage displays the ProjectDetail component.

    <image

✔ You have completed Lab 21

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