SJammy
3/6/2019 - 10:01 AM

Shorten URL - AJAX POST Request

main.js
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// Information to reach API
const apiKey = '67b46c9a54d348268f3963fb39d05147';
const url = 'https://api.rebrandly.com/v1/links';

// Some page elements
const inputField = document.querySelector('#input');
const shortenButton = document.querySelector('#shorten');
const responseField = document.querySelector('#responseField');

// AJAX functions
const shortenUrl = () => {
  const urlToShorten = inputField.value;
  const data = JSON.stringify({destination: urlToShorten});
  
  const xhr = new XMLHttpRequest();
  xhr.responseType = 'json';
  xhr.onreadystatechange = () => {
    if(xhr.readyState === XMLHttpRequest.DONE) {
       renderResponse(xhr.response);
    }
  };
  
  xhr.open('POST', url);
  xhr.setRequestHeader('Content-type', 'application/json');
  xhr.setRequestHeader('apikey', apiKey);
  
  xhr.send(data);
}


// Clear page and call AJAX functions
const displayShortUrl = (event) => {
  event.preventDefault();
  while(responseField.firstChild){
    responseField.removeChild(responseField.firstChild);
  }
  shortenUrl();
}

shortenButton.addEventListener('click', displayShortUrl);
helperFunctions.js
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// Manipulates responseField to render a formatted and appropriate message
const renderResponse = (res) => {
  // Displays either message depending on results
  if(res.errors){
    responseField.innerHTML = "<p>Sorry, couldn't format your URL.</p><p>Try again.</p>";
  } else {  
    responseField.innerHTML = `<p>Your shortened url is: </p><p> ${res.shortUrl} </p>`;
  }
}

// Manipulates responseField to render an unformatted response
const renderRawResponse = (res) => {
  // Displays either message depending on results
  if(res.errors){  
    responseField.innerHTML = "<p>Sorry, couldn't format your URL.</p><p>Try again.</p>";
  } else {
    // Adds line breaks for JSON
    let structuredRes = JSON.stringify(res).replace(/,/g, ", \n");
    structuredRes = `<pre>${structuredRes}</pre>`;
    responseField.innerHTML = `${structuredRes}`;
  }
}
index.html
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<!DOCTYPE html>
<html>
<head>
  <meta charset="utf-8">
  <title>Byte Size</title>
  <link rel="stylesheet" type="text/css" href="public/style.css" />
  <link href="https://fonts.googleapis.com/css?family=Roboto" rel="stylesheet">
  <link href="https://fonts.googleapis.com/css?family=Source+Sans+Pro" rel="stylesheet">
</head>

<body>
  <header>
    <img src="https://s3.amazonaws.com/codecademy-content/courses/intermediate-javascript-requests/bytesize_logo.svg" class="logo" />

  </header>
  <main id="main">
    <div class="container">

      <h1>Enter a URL</h1>

      <form id="form" autocomplete="off">
        <input type="text" id="input" value="">
        <button id="shorten">Shorten</button>
      </form>

      <div id="responseField">

      </div>

    </div>
  </main>
  <script src='https://code.jquery.com/jquery-3.1.0.min.js'></script>
  <script src="public/main.js"></script>
  <script src="public/helperFunctions.js"></script>
</body>
</html>