jQueryでFacebook,Twitter,LINEのシェア設定

social_share.js

/**
 * == SNSボタンでシェア ==
 * @constructor
 */
Index.Social = function() {
  var elm = {
    $twitter : $('.twitter a'),
    $facebook: $('.facebook a'),
    $line    : $('.line a'),
    $hatena  : $('.hatena a')
  },
  url = {
    'share'    : getShareUrl(),  // or root url
    'twitter'  : 'https://twitter.com/intent/tweet?url=',
    'facebook' : 'http://www.facebook.com/sharer.php?u=',
    'line'     : 'http://line.me/R/msg/text/',
    'hatena'   : 'http://b.hatena.ne.jp/add?mode=confirm&url='
  },
  txt = '',
  hashtags = 'xxx,yyy',
  title = '',
  size = {
    'width'  : 520,
    'height' : 350
  },
  center = {
    top : (screen.height - size.height) / 2,
    left: (screen.width  - size.width) / 2
  };
  
  var twitter = (function() {
    var href  = url.twitter;
        href += encodeURIComponent(url.share);
        href += '&text=' + encodeURIComponent(txt);
        href += '&hashtags=' + encodeURIComponent(hashtags);

        console.log(href);
    elm.$twitter.attr('href', href).on('click', function() {
      openExternal(href, 'twitterShare');
      return false;
    });
  })();

  var facebook = (function() {
    var href = url.facebook + encodeURIComponent(url.share);
    elm.$facebook.attr('href', href).on('click', function() {
      openExternal(href, 'facebookShare');
      return false;
    });
  })();

  var line = (function() {
    var href = url.line + encodeURIComponent(url.share);
    elm.$line.attr('href', href);
  })();

  var hatena = (function() {
    var href  = url.hatena + encodeURIComponent(url.share);
        href += '&title=' + title;
    elm.$hatena.attr('href', href).on('click', function() {
      openExternal(this.href, 'hatenaBookmark');
      return false;
    });
  })();

  function getShareUrl() {
    var url = location.href;
    $('meta').each(function() {
      if ( $(this).attr('property') === 'og:url' && $(this).attr('content') ) {
        url = $(this).attr('content');
      }
    });
    return url;
  }

  function openExternal(href, title) {
    window.open(
      href, title,
      'top=' + center.top + ',left=' + center.left + ',toolbar=0,menubar=0,status=0,width=' + size.width + ',height=' + size.height
    );
  }
}