Misc JavaScript Helpers

gistfile1.js

function adate(daysFromNow) {
    var date, datestr, mm, dd;
    datestr = new Date().getTime();
    if (!!daysFromNow) {
      datestr += (1000 * 60 * 60 * 24 * daysFromNow);
    }
    date = new Date(datestr);
    mm = date.getMonth() + '';
    if (mm.length == 1) {
      mm = '0' + mm;
    }
    dd = date.getDate() + '';
    if (dd.length == 1) {
      dd = '0' + dd;
    }
    return date.getFullYear() + '-' + mm + '-' + dd;
}


// found at http://james.padolsey.com/javascript/get-document-height-cross-browser/
function getDocHeight() {
  var D = document;
  return Math.max(
    Math.max(D.body.scrollHeight, D.documentElement.scrollHeight),
    Math.max(D.body.offsetHeight, D.documentElement.offsetHeight),
    Math.max(D.body.clientHeight, D.documentElement.clientHeight)
  );
}

// found at http://stackoverflow.com/questions/871399/cross-browser-method-for-detecting-the-scrolltop-of-the-browser-window
    function getScrollTop(){
        if(typeof pageYOffset!= 'undefined'){
            //most browsers
            return pageYOffset;
        }
        else{
            var B= document.body; //IE 'quirks'
            var D= document.documentElement; //IE with doctype
            D= (D.clientHeight)? D: B;
            return D.scrollTop;
        }
    }


function hex2rgb(hex, opacity) {
  var rgb = hex.replace('#', '').match(/(.{2})/g);

  var i = 3;
  while (i--) {
    rgb[i] = parseInt(rgb[i], 16);
  }

  if (typeof opacity == 'undefined') {
    return 'rgb(' + rgb.join(', ') + ')';
  }

  return 'rgba(' + rgb.join(', ') + ', ' + opacity + ')';
};


function getIFrameDocumentElement(iframe) {
  return (iframe.contentWindow) ? iframe.contentWindow : (iframe.contentDocument.document) ? iframe.contentDocument.document : iframe.contentDocument;
}


  // unset cookie
  function(name){
    return function(expires) {
      return document.cookie = escape(name) + '=' + expires + '; path=/';
    }((function(d){
      d.setTime(d.getTime() + (86400000 * -1));
      return '; expires=' + d.toGMTString();
    }(new Date())));
  }('name-of-cookie');