source: Dev/trunk/src/client/dijit/form/_FormValueWidget.js

define([
        "dojo/_base/declare", // declare
        "dojo/sniff", // has("ie")
        "./_FormWidget",
        "./_FormValueMixin"
], function(declare, has, _FormWidget, _FormValueMixin){

        // module:
        //              dijit/form/_FormValueWidget

        return declare("dijit.form._FormValueWidget", [_FormWidget, _FormValueMixin], {
                // summary:
                //              Base class for widgets corresponding to native HTML elements such as `<input>` or `<select>`
                //              that have user changeable values.
                // description:
                //              Each _FormValueWidget represents a single input value, and has a (possibly hidden) `<input>` element,
                //              to which it serializes it's input value, so that form submission (either normal submission or via FormBind?)
                //              works as expected.

                // Don't attempt to mixin the 'type', 'name' attributes here programatically -- they must be declared
                // directly in the template as read by the parser in order to function. IE is known to specifically
                // require the 'name' attribute at element creation time.  See #8484, #8660.

                _layoutHackIE7: function(){
                        // summary:
                        //              Work around table sizing bugs on IE7 by forcing redraw

                        if(has("ie") == 7){ // fix IE7 layout bug when the widget is scrolled out of sight
                                var domNode = this.domNode;
                                var parent = domNode.parentNode;
                                var pingNode = domNode.firstChild || domNode; // target node most unlikely to have a custom filter
                                var origFilter = pingNode.style.filter; // save custom filter, most likely nothing
                                var _this = this;
                                while(parent && parent.clientHeight == 0){ // search for parents that haven't rendered yet
                                        (function ping(){
                                                var disconnectHandle = _this.connect(parent, "onscroll",
                                                        function(){
                                                                _this.disconnect(disconnectHandle); // only call once
                                                                pingNode.style.filter = (new Date()).getMilliseconds(); // set to anything that's unique
                                                                _this.defer(function(){
                                                                        pingNode.style.filter = origFilter;
                                                                }); // restore custom filter, if any
                                                        }
                                                );
                                        })();
                                        parent = parent.parentNode;
                                }
                        }
                }
        });
});