Textbox value is not changing

paryasomayajulu

I am rendering a textbox in column uisng following code.

But the value is not getting update when i change the value in textbox ie even though i enter a value and if i see in firebug i am still not seeing 12

"mData": "Mon", "bSortable": false,
"mRender": function (data, type, full) {
var retHTML = '';
return retHTML;
}