ExtJs4 + IE9 = Object doesn't support property or method 'createContextualFragment'

Question

I'm working with ExtJs on IE9.. and i almost always get this error..

Microsoft JScript runtime error:

Object doesn't support property or method 'createContextualFragment'

What dose it means? What 'createContextualFragment' is needed for? And how to fix this?

Answer 1

createContextualFragment() is a method of Range objects that creates a document fragment from an HTML string. It's present in Firefox and WebKit and Opera but is currently non-standard (it's not in the DOM Level 2 Range spec but is in the work-in-progress DOM Parsing and Serialization spec) and IE 9 didn't implement it, which is consistent with Microsoft's general approach to implementing standard functionality in IE 9 that was previously missing in IE. ExtJs must be using this method, although rather foolishly since it is non-standard and the same result can easily be achieved using innerHTML, which is supported everywhere.

UPDATE

You can patch the following into IE 9 since it allows extension of host object prototypes, which previous versions did not. The following is a naive implementation of createContextualFragment() adapted from my Rangy library but is suitable for most uses. See this Rangy issue for details and for a more thorough implementation.

Note that this will not work in IE < 9 because those browsers have no DOM Range implementation.

if (typeof Range.prototype.createContextualFragment == "undefined") {
    Range.prototype.createContextualFragment = function(html) {
        var startNode = this.startContainer;
        var doc = startNode.nodeType == 9 ? startNode : startNode.ownerDocument;
        var container = doc.createElement("div");
        container.innerHTML = html;
        var frag = doc.createDocumentFragment(), n;
        while ( (n = container.firstChild) ) {
            frag.appendChild(n);
        }
        return frag;
    };
}

Answer 2

Faster, tighter, no looping, works in IE9+ and all non-shit browsers:

var createContextualFragment = (function(){
  var doc = document.implementation.createHTMLDocument(''),
      range = doc.createRange(),
      body = doc.body;
  return function(html){
    body.innerHTML = html;
    range.selectNodeContents(body);
    return range.extractContents();
  }
})();