Frontend UI

JavaScript Frontend UI

This frontend and backend project was setup to allow people to HaHa or Boohoo a collection of Computer Jokes.

Amazingly … the front-end code is in a completely different GitHub repo than the backend code. The backend is deployed seperately.

Future Hack Ideas

This code has lot of limitation.

• People can vote more than once and in both categories.
• There is no auto refresh if several are voting and updating as you are looking at your static page.
• Perhaps Q and A style could hide punch line.
• Perhaps we could accept new jokes, or have interface for adding them.

Frontend API Calls

The code below updates the HTML elementID (like or jeer) using the latest data from the backend database.

Latest GitHub Code

<!-- HTML table fragment for page -->
<table>
  <thead>
  <tr>
    <th>Joke</th>
    <th>HaHa</th>
    <th>Boohoo</th>
  </tr>
  </thead>
  <tbody id="result">
    <!-- javascript generated data -->
  </tbody>
</table>

<script type="module">
  import { javaURI, pythonURI, fetchOptions } from '/IanM_2025/assets/js/api/config.js';

  // prepare HTML defined "result" container for new output
  const resultContainer = document.getElementById("result");

  // keys for joke reactions
  const HAHA = "haha";
  const BOOHOO = "boohoo";

  // prepare fetch urls
  // const url = `${pythonURI}/api/jokes`;
  const url = `${javaURI}/api/jokes`;
  const getURL = url +"/";
  const likeURL = url + "/like/";  // haha reaction
  const jeerURL = url + "/jeer/";  // boohoo reaction

  // prepare fetch PUT options, clones with JS Spread Operator (...)
  const postOptions = {...fetchOptions,
    method: 'POST',
  }; // clones and replaces method

  // fetch the API
  fetch(getURL,fetchOptions)
    // response is a RESTful "promise" on any successful fetch
    .then(response => {
      // check for response errors
      if (response.status !== 200) {
          error('GET API response failure: ' + response.status);
          return;
      }
      // valid response will have JSON data
      response.json().then(data => {
          console.log(data);
          for (const row of data) {
            // make "tr element" for each "row of data"
            const tr = document.createElement("tr");

            // td for joke cell
            const joke = document.createElement("td");
              joke.innerHTML = row.id + ". " + row.joke;  // add fetched data to innerHTML

            // td for haha cell with onclick actions
            const haha = document.createElement("td");
              const haha_but = document.createElement('button');
              haha_but.id = HAHA+row.id   // establishes a HAHA JS id for cell
              haha_but.innerHTML = row.haha;  // add fetched "haha count" to innerHTML
              haha_but.onclick = function () {
                // onclick function call with "like parameters"
                reaction(HAHA, likeURL+row.id, haha_but.id);  
              };
              haha.appendChild(haha_but);  // add "haha button" to haha cell

            // td for boohoo cell with onclick actions
            const boohoo = document.createElement("td");
              const boohoo_but = document.createElement('button');
              boohoo_but.id = BOOHOO+row.id  // establishes a BOOHOO JS id for cell
              boohoo_but.innerHTML = row.boohoo;  // add fetched "boohoo count" to innerHTML
              boohoo_but.onclick = function () {
                // onclick function call with "jeer parameters"
                reaction(BOOHOO, jeerURL+row.id, boohoo_but.id);  
              };
              boohoo.appendChild(boohoo_but);  // add "boohoo button" to boohoo cell

            // this builds ALL td's (cells) into tr (row) element
            tr.appendChild(joke);
            tr.appendChild(haha);
            tr.appendChild(boohoo);

            // this adds all the tr (row) work above to the HTML "result" container
            resultContainer.appendChild(tr);
          }
      })
  })
  // catch fetch errors (ie Nginx ACCESS to server blocked)
  .catch(err => {
    error(err + ": " + getURL);
  });

  // Reaction function to likes or jeers user actions
  function reaction(type, postURL, elemID) {

    // fetch the API
    fetch(postURL, postOptions)
    // response is a RESTful "promise" on any successful fetch
    .then(response => {
      // check for response errors
      if (response.status !== 200) {
          error("Post API response failure: " + response.status)
          return;  // api failure
      }
      // valid response will have JSON data
      response.json().then(data => {
          console.log(data);
          // Likes or Jeers updated/incremented
          if (type === HAHA) // like data element
            document.getElementById(elemID).innerHTML = data.haha;  // fetched haha data assigned to haha Document Object Model (DOM)
          else if (type === BOOHOO) // jeer data element
            document.getElementById(elemID).innerHTML = data.boohoo;  // fetched boohoo data assigned to boohoo Document Object Model (DOM)
          else
            error("unknown type: " + type);  // should never occur
      })
    })
    // catch fetch errors (ie Nginx ACCESS to server blocked)
    .catch(err => {
      error(err + " " + postURL);
    });
  
  }

  // Something went wrong with actions or responses
  function error(err) {
    // log as Error in console
    console.error(err);
    // append error to resultContainer
    const tr = document.createElement("tr");
    const td = document.createElement("td");
    td.innerHTML = err;
    tr.appendChild(td);
    resultContainer.appendChild(tr);
  }

</script>