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Multi-item responsive carousel

Posted by: admin November 29, 2017 Leave a comment

Questions:

I’m building a website that requires a carousel to be implemented. Because this website is built on AngularJS I wanted to go with Angulars Boostrap Carousel, however, this carousel appears to only allow one image at a time.

What I will need will be 3 images at a time on desktop, on a tablet 2 images and on mobile 1. So there’s a significant element of responsive design involved here too.

Does anyone have any experince with this that doesn’t involve JQuery? I’m not opposed to it but have been told by a senior member of the team to try to source an alternative, if any.

What I tried from Angulars bootstrap:

   $scope.getPromoURLs = function() {
        var subObj = myJSON.response.details.promotionalSpots;
        for( var keys in subObj ) {
            var value = subObj[keys].promotionUrl;
            $scope.slides.push( value );
        }
    };
    // Builts an array of promotional URLS to from a JSON object to source the images
    $scope.getPromoURLs();

    $scope.addSlide = function () {
        // Test to determine if 3 images can be pulled together - FAILS
        var newWidth = 600 + slides.length;
        slides.push({
           image: ''+slides[0]+''+slides[1] // etc
           // Tried to stitch images together here 
        });
    };

    // TODO Should examine array length not hardcoded 4
    for (var i = 0; i < 4; i++) {
        $scope.addSlide();
    }        
Answers:

ui-bootstrap’s carousel is not a good choice, it has other drawback like isolated scope on each slide.
I’m using https://github.com/revolunet/angular-carousel which support multi item on each slide.

Because this directive support ng-repeat. You easy change you collection and using nested ng-repeat to set different number of items in each slide.

<ul rn-carousel class="image">
  <li ng-repeat="images in imageCollection">
    <div ng-repeat="image in images" class="layer">{{ image }}</div>
  </li>
</ul>

As you have already defined 3 break points. We just need to reconstruct the imageCollection array when viewport size changed.

$window.on('resize', function() {
    var width = $window.width();
    if(width > 900) {
       // desktop
       rebuildSlide(3);
    } else if(width <= 900 && width > 480) {
       // tablet
       rebuildSlide(2);
    } else {
       // phone
       rebuildSlide(1);
    }
    // don't forget manually trigger $digest()
    $scope.$digest();
});

function rebuildSlide(n) {
   var imageCollection = [],
       slide = [],
       index;
   // values is your actual data collection.
   for(index = 0; index < values.length; index++) {
       if(slide.length === n) {
           imageCollection.push(slide);
           slide = [];
       }
       slide.push(values[index]);
   }
   imageCollection.push(slide);
   $scope.imageCollection = imageCollection;
}

Questions:
Answers:

So, I tried this one so as to make angularjs Carousel (ui.bootstrap.carousel) to work with multi items per animation. I have also tried to apply [Detection for Responsive Websites using AngularJS].2

Take a look here: http://plnkr.co/edit/QhBQpG2nCAnfsb9mpTvj?p=preview

Results:

1 ) One Item (Mobile Version) :

enter image description here

2 ) Two Items (Tablet Version) :

enter image description here

3 ) Three Items (Desktop Version) :

enter image description here

PART 2:
It can also detect the resolution of the window so as to determine if it is tablet,mobile or desktop following this tutorial
Try to use this values: "mobile, tablet, desktop" to see the three different view versions.

Demonstration of the tablet version:

var app = angular.module('myApp', ['ui.bootstrap', 'angular-responsive']);

app.controller('MainCtrl', function($scope) {
  $scope.displayMode = 'mobile'; // default value


  $scope.$watch('displayMode', function(value) {

    switch (value) {
      case 'mobile':
        // do stuff for mobile mode
          console.log(value);
        break;
      case 'tablet':
        // do stuff for tablet mode
          console.log(value);
        break;
    }
  });
});

function CarouselDemoCtrl($scope) {
  var whatDevice = $scope.nowDevice;
  $scope.myInterval = 7000;
  $scope.slides = [{
    image: 'http://placekitten.com/221/200',
    text: 'Kitten.'
  }, {
    image: 'http://placekitten.com/241/200',
    text: 'Kitty!'
  }, {
    image: 'http://placekitten.com/223/200',
    text: 'Cat.'
  }, {
    image: 'http://placekitten.com/224/200',
    text: 'Feline!'
  }, {
    image: 'http://placekitten.com/225/200',
    text: 'Cat.'
  }, {
    image: 'http://placekitten.com/226/200',
    text: 'Feline!'
  }, {
    image: 'http://placekitten.com/227/200',
    text: 'Cat.'
  }, {
    image: 'http://placekitten.com/228/200',
    text: 'Feline!'
  }, {
    image: 'http://placekitten.com/229/200',
    text: 'Cat.'
  }, {
    image: 'http://placekitten.com/230/200',
    text: 'Feline!'
  }];


    var i, first = [],
      second, third;
    var many = 1;

    //##################################################    
    //Need to be changed to update the carousel since the resolution changed
    $scope.displayMode = "tablet";
    //##################################################
    if ($scope.displayMode == "mobile") {many = 1;}
    else if ($scope.displayMode == "tablet") {many = 2;} 
    else {many = 3;}

    for (i = 0; i < $scope.slides.length; i += many) {
      second = {
        image1: $scope.slides[i]
      };
      if (many == 1) {}
      if ($scope.slides[i + 1] && (many == 2 || many == 3)) {
        second.image2 = $scope.slides[i + 1];

      }
      if ($scope.slides[i + (many - 1)] && many == 3) {
        second.image3 = $scope.slides[i + 2];
      }
      first.push(second);
    }
    $scope.groupedSlides = first;
}

app.directive('dnDisplayMode', function($window) {
  return {
    restrict: 'A',
    scope: {
      dnDisplayMode: '='
    },
    template: '<span class="mobile"></span><span class="tablet"></span><span class="tablet-landscape"></span><span class="desktop"></span>',
    link: function(scope, elem, attrs) {
      var markers = elem.find('span');

      function isVisible(element) {
        return element && element.style.display != 'none' && element.offsetWidth && element.offsetHeight;
      }

      function update() {
        angular.forEach(markers, function(element) {
          if (isVisible(element)) {
            scope.dnDisplayMode = element.className;
            return false;
          }
        });
      }

      var t;
      angular.element($window).bind('resize', function() {
        clearTimeout(t);
        t = setTimeout(function() {
          update();
          scope.$apply();
        }, 300);
      });

      update();
    }
  };
});

Hope it helps!

Questions:
Answers:

AngularUI carousel is quite limited in this aspect, as it does not have any simple way to show more than one image.

I have tried something to show 3 images at a time.

You can check out the solution here:

angular.module('ui.bootstrap.demo', ['ngAnimate', 'ui.bootstrap']);
angular.module('ui.bootstrap.demo').controller('CarouselDemoCtrl', 
function ($scope) {
  $scope.myInterval = 5000;
  $scope.noWrapSlides = false;
  var slides = $scope.slides = [];
  $scope.addSlide = function() {
  var newWidth = 600 + slides.length + 1;
  slides.push({
      image: '//placekitten.com/' + newWidth + '/300',
      text: ['More','Extra','Lots of','Surplus'][slides.length % 4] + ' ' +
      ['Cats', 'Kittys', 'Felines', 'Cutes'][slides.length % 4]
    });
  };
  for (var i=0; i<4; i++) {
     $scope.addSlide();
  }


  $scope.timelist =[
            {
            "time":"0"            
            },
                {
            "time":"1"            
            },
                {
            "time":"2"
            },
                {
            "time":"3"            
            }
          ];

});

Full code: http://plnkr.co/edit/RslvCrvvBcbmJUQXp0bl?p=info