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HTML

              
                <div id="app" class="container text-center">  
  <div class="gallery">
    <h1>{{ title }} <small>Vue.js</small></h1>    
    <div class="row">
      <div v-for="photo in photos" class="photo-frame" @click="showPhoto(photo.id)">   
        <div class="photo" :style="{ backgroundImage: 'url(' + photo.urlThumbnail + ')' }"></div>      
      </div>    
    </div>
    <div class="row">
      <div class="pager-frame">
        <ul class="pager-frame">
          <li v-for="page in idxLastPage" class="page" :class="{ active: (idxCurrentPage+1) == page }" @click="paginate(page-1)">
            <a href="#">{{ page }}</a> 
          </li>         
        </ul>           
      </div>
    </div>
  </div>  
  <div id="overlay" v-show="isShowPhoto" @click="isShowPhoto=false"></div>  
  <div id="layout" v-show="isShowPhoto" @click="isShowPhoto=false">
    <img :src="showPhotoUrl" alt="">
    <div class="prev" @click.stop="goPrevPhoto()">&lt;</div>
    <div class="next" @click.stop="goNextPhoto()">&gt;</div>
    <div class="status">
      {{ idxCurrentPhoto+1 }} / {{ idxLastPhoto+1 }}
    </div>
  </div>  
</div>

<div class="container-fluid footer text-center">    
  <p>A teljes cikket elolvashatod az ITHub-on. Klikkelj a logóra alább!</p>
  <p><em>You can read the Hungarian full article on the ITHub. Click the logo below!</em></p>
  <a href="https://ithub.hu/blog/post/Bevezetes-a-Vuejs-keretrendszerbe/" target="ithub">
    <img src="https://ithub.hu/images/ithub-logo-dark.png" alt="ithub logo" style="width: 85px; height: auto;">    
  </a>  
</div>
              
            
!

CSS

              
                @import url('https://fonts.googleapis.com/css?family=PT+Sans+Narrow');

body {
  font-family: 'PT Sans Narrow', sans-serif;
}  

.container {
  max-width: 1500px;
  margin: 10px auto;
  clear: both;   
}

.text-center {
  text-align: center;
}
  
.gallery {    
  h1 {
   font-size: 3em; 
   color: #226;
    small {
      font-size: 1em;
      color: #888;
    }
  }
  
  .photo-frame {
    width: 310px;
    height: 210px;
    padding: 5px;
    border: 1px solid #eee;
    background-color: #fafafa;
    margin: 5px;
    float: left;
    cursor: pointer;
  
    .photo {
      width: 300px;
      height: 200px;
      border: 1px solid #aaa;
      padding-left: 5px;
      padding-top: 5px;
      overflow: hidden;      
      background-position: top center;
      background-size: cover;
    }  
  }     
}

div.row {
  clear: both;
}

ul.pager-frame {    
  display: inline-block;
  clear: both;
  text-align: center;
  list-style-type: none;

  li.page {
    width: 40px;
    border-radius: 50px 50px;
    border: 1px solid #888;
    float: left;
    margin-left: 20px;

    &:hover {
        background-color: #ccc;
        cursor: pointer;
      }

    a {
      text-decoration: none;
      color: #222;        
    }

    font-size: 2em;      
    &.active {
      background-color: #ddd;
    }
  }
}

#overlay {  
  position: fixed;
  z-index: 10;  
  left: 0px;
  top: 0px;
  width: 100%;
  height: 100%;
  text-align: center;  
  background: rgba(0, 0, 0, 0.7); 
  text-align: center;
}

#layout {  
  z-index: 11;
  position: absolute;
  top: 0;
  left: 0;
  width: 95%;      
  margin-top: 50px;
  text-align: center;    

  img {
    margin: 40px auto 0;
    max-width: 1260px;                  
    width: 100%;                
    border: 1px solid #aaa;
    box-shadow: 0 0 10px black;
  }            
  
  .next, .prev {    
    position: absolute;    
    top: 70px;    
    width: 40px;
    height: 30px;
    border: 2px solid #ffffff88;
    border-radius: 50px 50px;
    box-shadow: 2px 2px 10px black;    
    padding-top: 10px;
    color: white;
    text-shadow: 2px 2px 10px black;
    cursor: pointer;
    
    &:hover {
      background-color: #ffffff22;
      border-color: #ffffff;
    }
  }
    
  .prev {
    left:20px; 
  }
  
  .next {
    right:20px; 
  }
  
  .status {
    position: absolute;    
    top: 70px;  
    right: 100px;
    width: 50px;
    height: 30px;
    border: 2px solid #ffffff88;
    border-radius: 5px;
    box-shadow: 2px 2px 10px black;    
    padding-top: 10px;
    color: white;
    text-shadow: 2px 2px 10px black;    
    background-color: #ffffff88;
  }
}

/** footer ***/

.container-fluid {  
  width: 100%;
  margin: 10px 0;
  clear: both;   
}

.footer {
  background-color: #1B1C1D;
  padding: 10px 10px;;
  color: white;
  font-size: 20px;
  font-family: arial;
  text-height: 40px;
  
  em {
    color: #aaa;  
  }
  
  a {
    display: inline-block;
    border: 1px solid #aaa;
    border-radius: 10px;
    padding: 10px;    
    color: #ddd;
    text-decoration: none;    
  }
}
              
            
!

JS

              
                var allPhotos = getPhotos();

new Vue({
  el: '#app',
  data: {
    title: 'Collection of Awesome Girls',
    allPhotos: allPhotos, // all photos
    photos: [],           // photos in the current page
    photosPerPage: 12,    // photos per page
    idxLastPhoto: 0,      // last photo's id
    idxCurrentPage: 0,    // current photo's id
    idxLastPage: 0,       // last page's id      
    isShowPhoto: false,   // 
    showPhotoUrl: '',     // selected photo url
    idxCurrentPhoto: 0    // current photo index
    
  }, 
  mounted: function() {    
    // init indexes
    this.idxLastPhoto = this.allPhotos.length-1;
    this.idxLastPage = Math.floor(this.allPhotos.length / this.photosPerPage); 
    
    // show first page
    this.paginate(0);
    
    document.addEventListener("keydown", e => {
      if (this.isShowPhoto && e.keyCode == 27) {
          this.isShowPhoto = false;
      }
    });
  },
  methods: {
    /** Paginate photos / Rebuild photos array
     *
     */
    paginate: function(idxPage) {
      this.idxCurrentPage = idxPage;
      
      // determine period
      var idxStart = Math.floor(idxPage*this.photosPerPage); 
      var idxEnd = idxStart+this.photosPerPage>this.idxLastPhoto+1?this.idxLastPhoto:idxStart+this.photosPerPage;      
      
      // drop the visible photos
      this.photos.splice(0, this.photos.length)      
      
      // reload visible photos from all photo
      for(var idx = idxStart; idx < idxEnd; idx++) {
        this.photos.push(this.allPhotos[idx]);                 
      }
    },
    
    /**
     * Show image preview larger
     */
    showPhoto: function(id) {            
      var that = this;
      
      // find photo data by id
      this.allPhotos.forEach(function(photo, idx) {
        if (photo.id === id) {     
          // lock background and show photo
          that.isShowPhoto = true;    
          that.showPhotoUrl = photo.urlPhoto;      
          that.idxCurrentPhoto = idx;
          
          // go top of the page
          window.scrollTo(0,0);
        }
      });
    },
    goPrevPhoto: function() {
      var current = this.idxCurrentPhoto;      
      this.showPhoto(this.allPhotos[current === 0 ? this.idxLastPhoto : current-1].id);
      
    },
    goNextPhoto: function() {
      var current = this.idxCurrentPhoto;      
      this.showPhoto(this.allPhotos[current === this.idxLastPhoto ? 0 : current+1].id);      
    }
  }
});

/**
 * Get photos from pexels.com and generate urls by ids
 * @return array [{urlThumbnail, urlPhoto, idx}, ...]
 */
function getPhotos() {
  var pexelIds = [
    289225, 866019, 255349, 864939, 864990, 675927, 206529, 413727, 413998, 858117, 293029, 826349,
    247199, 255332, 945813,  265705,  247298, 906052, 654690, 863977, 732420, 573299, 415829, 247322, 
    207936, 394545, 594365, 715840, 819469, 746825,  413885, 774367, 269746, 206388, 235516, 805367
  ];

  var photos = [];
  pexelIds.forEach(function(id) {    
    photos.push({
      urlPhoto: 'https://images.pexels.com/photos/'+id+'/pexels-photo-'+id+'.jpeg?w=1260&h=750&auto=compress&cs=tinysrgb',
      urlThumbnail: 'https://images.pexels.com/photos/'+id+'/pexels-photo-'+id+'.jpeg?w=400&h=400&auto=compress&cs=tinysrgb',
      id: id
    });  
  });
  
  return photos;
};
              
            
!
999px

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