source: Dev/trunk/src/client/dojox/mvc/_TextBoxExtensions.js

define([
        "dojo/_base/lang",
        "dijit/_WidgetBase",
        "dijit/form/ValidationTextBox",
        "dijit/form/NumberTextBox"
], function(lang, WidgetBase, ValidationTextBox, NumberTextBox){

        // monkey patch dijit/form/ValidationTextBox.isValid to check this.inherited for isValid.
        // hide patch from doc parser though because we want it to display the original definition of isValid.
        var oldValidationTextBoxIsValid = ValidationTextBox.prototype.isValid;
        ValidationTextBox.prototype.isValid = /*===== oldValidationTextBoxIsValid || =====*/ function(/*Boolean*/ isFocused){
                return (this.inherited("isValid", arguments) !== false && oldValidationTextBoxIsValid.apply(this, [isFocused]));
        };

        // monkey patch dijit/form/NumberTextBox.isValid to check this.inherited for isValid.
        // hide patch from doc parser though because we want it to display the original definition of isValid.
        var oldNumberTextBoxIsValid = NumberTextBox.prototype.isValid;
        NumberTextBox.prototype.isValid = /*===== oldNumberTextBoxIsValid || =====*/ function(/*Boolean*/ isFocused){
                return (this.inherited("isValid", arguments) !== false && oldNumberTextBoxIsValid.apply(this, [isFocused]));
        };

        if(!lang.isFunction(WidgetBase.prototype.isValid)){
                WidgetBase.prototype.isValid = function(){
                        var valid = this.get("valid");
                        return typeof valid == "undefined" ? true : valid;
                };
        }

        WidgetBase.prototype._setValidAttr = function(value){
                this._set("valid", value);
                this.validate();
        };
});