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A Pen By Captain Anonymous

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              <html>

<head>
  <title>Inject Style Testing</title>
</head>

<body>
  <div id="myDiv" class="myClass">
    <h3>Injecting Style Dynamically</h3>
  </div>
</body>

</html>
            
          
!
            
              /**
*   Method for injecting dynamic CSS rules to page.
*   rules {Object/Array of objects} required. If Object then this single rule will be created under generated style tag. 
           If Array then each rule will be created under the generated style tag. e.g [ {'a:hover': 'color:blue|background:gray'}, {'.myClass': 'background:black'} ]
*   container {element} optional. If specified, generated style (tag) will be appended to it, otherwise it will be appended to document body.
*   styleId {string}    optional. id of the generated style tag. If a style with this id already exists, it will be removed before inserting this new style.
*   prepend {boolean}   optional. If true, the generated style tag is prepended to the supplied container (if it exists or document body) rather than being appended.
*/
function injectStyles(rules, styleId, container, prepend) {

  var rulesStr = '';
  if (!$.isArray(rules))
    rules = [rules];

  var fn = function(key, value) {
    rulesStr += ($.trim(key) + '\n{\n');
    var ruleOptions = value.split("|");
    for (var j = 0; j < ruleOptions.length; j++) {
      rulesStr += ('\t' + $.trim(ruleOptions[j]) + ';\n');
    }
    rulesStr += '}\n\n';
  };

  for (var i = 0; i < rules.length; i++) {
    var rule = rules[i];

    $.each(rule, fn);
  }

  if (styleId)
    $("#" + styleId).remove();

  if (!container) {
    if (prepend !== true)
      return $('<style ' + (styleId ? 'id="' + styleId + '" ' : '') + ' type="text/css">' + rulesStr + '</style>').appendTo('body');
    else
      return $('<style ' + (styleId ? 'id="' + styleId + '" ' : '') + ' type="text/css">' + rulesStr + '</style>').prependTo('body');
  } else {
    if (prepend !== true)
      return $(container).append('<style ' + (styleId ? 'id="' + styleId + '" ' : '') + ' type="text/css">' + rulesStr + '</style>');
    else
      return $(container).prepend('<style ' + (styleId ? 'id="' + styleId + '" ' : '') + ' type="text/css">' + rulesStr + '</style>');
  }
}

$(function() {
  injectStyles([{
    '#myDiv': 'color:red|font-weight:bold'
  }, {
    '.myClass': 'color:blue|background:black'
  }], "myStyle1");
});
            
          
!
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