The textarea editor is defined as below, no options required, but you can add any options in 'init' function.
textarea: {
init: function(container, options){
var input = $('<textarea class="datagrid-editable-input"></textarea>').appendTo(container);
return input;
},
getValue: function(target){
return $(target).val();
},
setValue: function(target, value){
$(target).val(value);
},
resize: function(target, width){
$(target)._outerWidth(width);
}
}