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I mentioned earlier that there s a special property in the global event object called cancelBubble This property is useful for controlling the dispatcher s propagation of the event If we set this property to true, the propagation will be stopped, and the event handlers of the elements further up the tree will no longer be invoked Let s look at the following example to see how it works: <html> <head> <script src="mootoolsjs"></script> <script> windowaddEvent('domready', function(){ // the image $$('img')attachEvent('onclick', function(){ consolelog('img'); }); // the body element $$('body')attachEvent('onclick', function(){ consolelog('body'); windoweventcancelBubble = true; }); // the html element $$('html')attachEvent('onclick', function(){ consolelog('html'); }); // the document element $$(document)attachEvent('onclick', function(){ consolelog('document'); }); }); </script> </head> <body> <img src="hello.

A Facade pattern is a design that ensures the complexity of many interfaces is hidden behind a simple and uniform interface.

A Facade pattern is used where there is a requirement, by client code, for a high-level abstraction that is simple to use.

png"> </body> </html> In this snippet, we set the cancelBubble property of the global event object to true inside the <body> event handler When we run this in the browser and click on the image, we get the following console output: img , body Because we canceled the bubbling of the event in the click event handler of the.

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In many domains, software becomes complex as it seeks to interact with many interfaces, systems, or subsystems. When complexity is thrust upon a client, it puts at risk the usability of the software. In most domains this presents a problem, so to overcome the problem, the Facade pattern is incorporated into the design of the program.

<body>, the dispatcher stopped further propagation of the event, and no longer called the click event handlers of the other elements.

The complexity of managing multiple interfaces is delegated to a facade class that hides the complexity from client code and instead presents it with a simple interface.

In this chapter, you learned the fundamentals of LTS and LINQ by taking a Bottom Up approach to ORM. LINQ is a set of standard query operators that can be valuable in developing a robust, well-architected solution. LINQ provides a framework for querying any data source, not just relational databases. LTS is one of the products under the LINQ umbrella. LTS uses DBML metadata to handle the mapping of objects to relational databases. LTS ships with two tools, the designer and SqlMetal, that can be used to generate DBML and ORM code. After creating the entities and data context, it is a simple task to query, insert, update, and delete items in your database. LTS tracks all changes that you make to your entities, thus allowing for a disconnected ORM experience. SQL is dynamically generated and executed against SQL Server with the appropriate statement (for example, INSERT, SELECT, UPDATE, DELETE). In 4, you will take a much deeper dive into LTS. You will learn about advanced querying, debugging, transactions, functions, stored procedures, and more. You will be building out the HR application so that it is more functional and exploring options for development without code generation.

Just as with attaching event handlers, the Internet Explorer event model also gives us a method for detaching event handlers, called detachEvent. Like attachEvent, the detachEvent method is available on all elements, and takes two arguments: type, which is the type of event handler that we re detaching, and handler, which is the actual handler function we re removing. For example, here s an event handler that detaches itself after the element has been clicked three times: var counter = 0; var handler = function(){ if (counter < 3){ console.log('Hello!'); } else { window.event.srcElement.detachEvent('onclick', handler); } counter++; }; var item = $('item'); item.attachEvent('onclick', handler); When the element with the id item is clicked, the handler function will be invoked, which then checks how many times the function has been called. If it s been called less than three times, the function simply outputs Hello via the console. However, if it s been called more than three times, the handler function detaches itself from the element. Notice that we use the same function identifier, handler, for both the attachEvent and detachEvent methods. This is because the value of the handler method must be the exact same function you used with attachEvent. The event dispatcher will search through the event handlers for the element and compare each handler to the function; if it finds a match, that handler is detached. This is why I advised against using anonymous functions if you need to detach events later: if you don t have access to the original function you used for attachEvent, you won t be able to detach it via detachEvent.

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