كود تصغير وتكبير

(function() {

  window.fa_img_resizer = {
    max_width : 400, // maximum image width (400px)
    max_height : 250, // maximum image height (250px)
 
    selector : '.postbody > div:not(.user):not(.postprofile) img, .mod_news img, .message-text img', // where images should be resized
 
    options : {
            bar : true, // resized image options bar
        toggler : true, // Enlarge / Reduce Image
      full_size : true, // Show full size
      download : true, // Download image link
      lightbox : true // lightbox effect
    },
 
    // texts
    lang : {
      full_size : '<i class="fa fa-external-link"></i> عرض الحجم بالكامل',
        enlarge : '<i class="fa fa-search-plus"></i> تكبير الصورة',
        reduce : '<i class="fa fa-search-minus"></i> تصغير الصورة',
      download : '<i class="fa fa-download"></i> تحميل الصورة',
      tooltip : 'اضغط هنا لعرص الصورة بالكامل'
    },
 
    // resize all images inside the "resizeIn" elements
    resize : function() {
      for (var a = $(fa_img_resizer.selector), i = 0, j = a.length; i < j; i++) {
        if (!a[i].alt && (a[i].naturalWidth > fa_img_resizer.max_width || a[i].naturalHeight > fa_img_resizer.max_height)) {
          a[i].className += ' fa_img_reduced';
 
          // make the image a "link" if it's not wrapper with one
          if (fa_img_resizer.options.lightbox && a[i].parentNode.tagName != 'A') {
            a[i].style.cursor = 'pointer';
            a[i].title = fa_img_resizer.lang.tooltip;
 
            a[i].onclick = function() {
              fa_img_resizer.lightbox(this);
            };
          }
 
          // create the resize bar
          if (fa_img_resizer.options.bar) {
            (a[i].parentNode.tagName == 'A' ? a[i].parentNode : a[i]).insertAdjacentHTML('beforebegin',
              '<div class="fa_img_resizer" style="width:' + (a[i].width - 8) + 'px;">'+
                (fa_img_resizer.options.toggler ? '<a class="fa_img_enlarge" href="#" onclick="fa_img_resizer.toggle(this); return false;">' + fa_img_resizer.lang.enlarge + '</a>' : '')+
                (fa_img_resizer.options.full_size ? '<a class="fa_img_full" href="/viewimage.forum?u=' + a[i].src + '" target="_blank">' + fa_img_resizer.lang.full_size + '</a>' : '')+
                (fa_img_resizer.options.download && !/Firefox/.test(navigator.userAgent) && 'download' in document.createElement('A') ? '<a class="fa_img_download" href="' + a[i].src + '" target="_blank" download>' + fa_img_resizer.lang.download + '</a>' : '' )+
              '</div>'
            );
          }
        }
      }
    },
 
    // toggle between enlarged and reduced image sizes
    toggle : function(that) {
      var img = that.parentNode.nextSibling;
 
      if (img.tagName == 'A') {
        img = img.getElementsByTagName('IMG')[0];
      }
 
      if (/fa_img_reduced/.test(img.className)) {
        that.innerHTML = fa_img_resizer.lang.reduce;
        that.className = 'fa_img_reduce';
        img.className = img.className.replace(/fa_img_reduced/, 'fa_img_enlarged');
      } else {
        that.innerHTML = fa_img_resizer.lang.enlarge;
        that.className = 'fa_img_enlarge';
        img.className = img.className.replace(/fa_img_enlarged/, 'fa_img_reduced');
      }
 
      that.parentNode.style.width = img.width - 8 + 'px';
    },
 
    // lightbox effect
    lightbox : function(that) {
      var frag = document.createDocumentFragment(),
          overlay = $('<div id="fa_img_lb_overlay" />')[0],
          img = $('<img id="fa_img_lb_image" src="' + that.src + '" />')[0];
 
      overlay.onclick = fa_img_resizer.kill_lightbox;
      img.onclick = fa_img_resizer.kill_lightbox;
 
      frag.appendChild(overlay);
      frag.appendChild(img);
      document.body.appendChild(frag);
      document.body.style.overflow = 'hidden';
 
      img.style.marginTop = '-' + (img.height / 2) + 'px';
      img.style.marginLeft = '-' + (img.width / 2) + 'px';
    },
 
    // kill the lightbox
    kill_lightbox : function() {
      var overlay = document.getElementById('fa_img_lb_overlay'),
          img = document.getElementById('fa_img_lb_image');
 
      overlay && document.body.removeChild(overlay);
      img && document.body.removeChild(img);
      document.body.style.overflow = '';
    }
  };
 
  // write styles into the document head
  document.write(
    '<style type="text/css">'+
      fa_img_resizer.selector + ', .fa_img_reduced { max-width:' + fa_img_resizer.max_width + 'px; max-height:' + fa_img_resizer.max_height + 'px; }'+
      '.fa_img_enlarged { max-width:100% !important; max-height:100% !important; }'+
      '.fa_img_resizer { font-size:12px; text-align:right; padding:3px; margin:3px 0; background:#FFF; border:1px solid #CCC; }'+
      '.fa_img_resizer a { margin:0 3px; }'+
      '.fa_img_resizer i { font-size:14px; vertical-align:middle; }'+
      '#fa_img_lb_overlay { background:rgba(0, 0, 0, 0.7); position:fixed; top:0; right:0; bottom:0; left:0; z-index:999999; cursor:pointer; }'+
      '#fa_img_lb_image { max-height:100%; max-width:100%; position:fixed; left:50%; top:50%; z-index:9999999; cursor:pointer; }'+
    '</style>'+
    (!$('link[href$="font-awesome.min.css"]')[0] ? '<link rel="stylesheet" href="https://maxcdn.bootstrapcdn.com/font-awesome/4.6.1/css/font-awesome.min.css" />' : '') // require font awesome
  );
 
  // begin modifying images when the page is loaded
  $(window).load(fa_img_resizer.resize);
 
  // kill forumactif's image resizer
  if (window.resize_images) {
    window.resize_images = function() {
      return false;
    };
  }
}());