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Consuming RESTfull API

A Pen By Vitaliy Merkulov

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HTML

            
              <div class="navbar-wrapper">
      <div class="container">

        <nav class="navbar navbar-inverse navbar-static-top">
          <div class="container">
            <div class="navbar-header">
              
              <a class="navbar-brand" href="#">South Lake Tahoe's Weather Alerts</a>
            </div> 
          </div>
        </nav>
      </div>
    </div>


    <!-- Carousel
    ================================================== -->
    <div id="myCarousel" class="carousel slide" data-ride="carousel">
      <!-- Indicators -->
      <ol class="carousel-indicators">
        <!-- indicators get placed her by js -->
      </ol>
      <div class="carousel-inner" role="listbox">        
        
      </div>
      <a class="left carousel-control" href="#myCarousel" role="button" data-slide="prev">
        <span class="glyphicon glyphicon-chevron-left" aria-hidden="true"></span>
        <span class="sr-only">Previous</span>
      </a>
      <a class="right carousel-control" href="#myCarousel" role="button" data-slide="next">
        <span class="glyphicon glyphicon-chevron-right" aria-hidden="true"></span>
        <span class="sr-only">Next</span>
      </a>
    </div><!-- /.carousel -->

    <div class="container marketing">

    <div class="row featurette">
        <div class="col-md-7">
          <h2 class="featurette-heading">Consuming RESTful API <span class="text-muted">Example Code with JavaScript, jQuery, Bootstrap</span></h2>
          <p class="lead">In this example, I take the data from the weather API and display it on the page. I use JavaScript to get the data from the API, and use a combination of jQuery and Bootstrap to put data into DOM. Take js code has comments every step of the way so you'll be able to see what I've done here.</p>
          <p>If you're just getting started with REST, here is a good <a href="http://g-liu.com/blog/2016/07/a-strategy-for-consuming-rest-apis-in-javascript/">tutorial on Consuming RESTful APIs</a> by Geoffrey Liu. Start with plain JavaScript way first so you can learn the concept. Then you can move on to using your favorite js frameworks like AngularJS, ReactJS and etc. </p>
          
          <h3>Access-Control-Allow-Origin</h3>
          
          <p>Keep in mind, most browsers do not allow accessing APIs from different domain names. A good way around that is using <a href="https://developer.mozilla.org/en-US/docs/Web/HTTP/Access_control_CORS">CORS</a> or if you're in a dev environment use a <a href="https://chrome.google.com/webstore/detail/allow-control-allow-origi/nlfbmbojpeacfghkpbjhddihlkkiljbi">chrome extension</a> that will allow you access to a remote API. You can also use a free CORS proxy by putting <a href="https://crossorigin.me/">crossorigin.me/</a> in front of your remote API url and it will magically allow you to see the remote API without restriction. (don't use this on a production because the data is not secure) </p>
        </div>
        <div class="col-md-5">
          <img class="featurette-image img-responsive center-block" src="https://image.slidesharecdn.com/consumingrestin-net-101025201559-phpapp02/95/consuming-rest-in-net-6-638.jpg?cb=1422666566" alt="Consuming RESTful API example">
        </div>
      </div>

      <!-- /END THE FEATURETTES -->
  
      <hr class="featurette-divider">


      <!-- FOOTER -->
      <footer>
        <p class="pull-right"><a href="#">Back to top</a></p>
        <p>&copy; 2017 VitWorks.com. &middot; <a href="http://vitworks.com/contact-me/">Hire Me</a> </p>
      </footer>

    </div><!-- /.container -->
!

CSS

            
              /* GLOBAL STYLES
-------------------------------------------------- */
/* Padding below the footer and lighter body text */

body {
  padding-bottom: 40px;
  color: #5a5a5a;
}


/* CUSTOMIZE THE NAVBAR
-------------------------------------------------- */

/* Special class on .container surrounding .navbar, used for positioning it into place. */
.navbar-wrapper {
  position: absolute;
  top: 0;
  right: 0;
  left: 0;
  z-index: 20;
}

/* Flip around the padding for proper display in narrow viewports */
.navbar-wrapper > .container {
  padding-right: 0;
  padding-left: 0;
}
.navbar-wrapper .navbar {
  padding-right: 15px;
  padding-left: 15px;
}
.navbar-wrapper .navbar .container {
  width: auto;
}


/* CUSTOMIZE THE CAROUSEL
-------------------------------------------------- */

/* Carousel base class */
.carousel {
  height: 500px;
  margin-bottom: 60px;
}
/* Since positioning the image, we need to help out the caption */
.carousel-caption {
  z-index: 10;
}

/* Declare heights because of positioning of img element */
.carousel .item {
  height: 500px;
  background-color: #777;
}
.carousel-inner > .item > img {
  position: absolute;
  top: 0;
  left: 0;
  min-width: 100%;
  height: 500px;
}


/* MARKETING CONTENT
-------------------------------------------------- */

/* Center align the text within the three columns below the carousel */
.marketing .col-lg-4 {
  margin-bottom: 20px;
  text-align: center;
}
.marketing h2 {
  font-weight: normal;
}
.marketing .col-lg-4 p {
  margin-right: 10px;
  margin-left: 10px;
}


/* Featurettes
------------------------- */

.featurette-divider {
  margin: 80px 0; /* Space out the Bootstrap <hr> more */
}

/* Thin out the marketing headings */
.featurette-heading {
  font-weight: 300;
  line-height: 1;
  letter-spacing: -1px;
}


/* RESPONSIVE CSS
-------------------------------------------------- */

@media (min-width: 768px) {
  /* Navbar positioning foo */
  .navbar-wrapper {
    margin-top: 20px;
  }
  .navbar-wrapper .container {
    padding-right: 15px;
    padding-left: 15px;
  }
  .navbar-wrapper .navbar {
    padding-right: 0;
    padding-left: 0;
  }

  /* The navbar becomes detached from the top, so we round the corners */
  .navbar-wrapper .navbar {
    border-radius: 4px;
  }

  /* Bump up size of carousel content */
  .carousel-caption p {
    margin-bottom: 20px;
    font-size: 21px;
    line-height: 1.4;
  }

  .featurette-heading {
    font-size: 50px;
  }
}

@media (min-width: 992px) {
  .featurette-heading {
    margin-top: 120px;
  }
}
!

JS

            
              var jsonURL = "/vitworks/pen/zNQPNV.js"; //saved JSON file for codePen demo only
// Get live data from darksky.net with your own API key
//https://api.darksky.net/forecast/your_own_api_key/38.9554942,-119.9453795?exclude=minutely,hourly

var ajax = new XMLHttpRequest();
ajax.onload = functionName;
ajax.onerror = errorFunctionName;
ajax.open("GET", jsonURL, true);
ajax.send();

function functionName() {
  
    if (this.status == 200) { // request succeeded
        var weather = JSON.parse(this.responseText);
        
        
        // If Weather Alerts are available
        if (weather.hasOwnProperty("alerts")){
          // Create a carousel for each weather alert
          
          for (var i = 0; i < weather.alerts.length; i++ ){
            $(".carousel-indicators").append('<li data-target="#myCarousel" data-slide-to="'+ i +'"></li>');
            $(".carousel-indicators li:first").addClass("active");
 
            $(".carousel-inner").append('<div class="item"><div class="container"><div class="carousel-caption alert_'+ i +'"></div></div></div>');
            $(".item:first").addClass("active");
            $(".alert_"+ i ).append("<h1>" + weather.alerts[i].title +"</h1>");
            
            //list all regions affected by this Alert
            $(".alert_"+ i ).append("<h5></h5>");
            var allRegions = []; // This could also be done with strings
              for (var j = 0; j < weather.alerts[i].regions.length; j++){
                allRegions.push(weather.alerts[i].regions[j]); //put all regions into array
              }
            $(".alert_"+ i + " h5" ).text(allRegions.join(", ")); //Put commas between regions
            
            var alertIntro = shorten(weather.alerts[i].description, 310); // Shorten the alert message
            $(".alert_"+ i ).append("<p>" + alertIntro + "</p>");
            $(".alert_"+ i ).append('<p><a class="btn btn-lg btn-primary" href="'+ weather.alerts[i].uri +'" role="button">More Info</a></p>');

          }; // End Alerts loop.
          
 
            
        } else{
          // There are no Alerts, create on carousel with a message 
            
            $(".carousel-inner").append('<div class="item active"><div class="container"><div class="carousel-caption"></div></div></div>');       
            $(".carousel-caption").append("<h1>No Weather Alerts</h1>");
            $(".carousel-caption" ).append("<p>Currently there are no weather alerts in South Lake Tahoe area!</p>");
            $(".carousel-caption" ).append('<p><a class="btn btn-lg btn-primary" href="http://www.weather.com" role="button">Weather Info</a></p>');         
        }
      
        
    } else {
        // handle more HTTP response codes here;
      console.log(this.statusText);
    }
}
function errorFunctionName(e) {
    $(".carousel-inner").append('<div class="item active"><div class="container"><div class="carousel-caption"></div></div></div>');       
    $(".carousel-caption").append("<h1>No Weather Data Found</h1>");
    $(".carousel-caption" ).append("<p>Can't load weather data. Check your internet connection.</p>");
    $(".carousel-caption" ).append('<p><a class="btn btn-lg btn-primary" href="https://fast.com/" role="button">Check your internet connection</a></p>'); 
}

function shorten(text, maxLength) {
    var ret = text;
    if (ret.length > maxLength) {
        ret = ret.substr(0,maxLength-3) + "...";
    }
    return ret;
}
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