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When you run a function, the this keyword belongs to the owner of the function. The default owner is the window object: function myfunction() { alert(this); // this would refer to the window object. } As you add functions onto other objects, you are essentially chaining them together. One object belongs to another, which belongs to another: var el = function () { alert(this); // this would refer to the window object. } el.methodname = function() { alert(this); // this would refer to our el object } This tends to get a little confusing when you pass a method of one object as a parameter into another function: var el = function () { alert(this); // this would refer to the window object. } el.methodname = function() { alert(this); }

Let s first determine which particular tables you need to create and how these tables will be related with each other. So, you might look at Figure 5-10 provided in 5. However, as mentioned earlier, that figure can give you only the general shape of the database tier being built here. Figure 6-1 goes a bit further and illustrates the entire set of the tables to be created, as well as the relationships between those tables.

Click the Create Database link near the top of the page, just beneath the Overview header. This will pop up a modal dialog box, like the one shown in Figure 5-2.

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Figure 6-1. Database tables that will be used within the sample application As you can see, we ve added two more tables, namely, details and shoppingCarts, in order to make the application look more realistic. The details table will be used to store the line items of orders. It s common practice to store order items in a separate table, since a single order usually has more than one line item. The shoppingCarts table is designed to store the information from the shopping carts of users. Having put one or more books in the shopping cart, a user will be able to then place an order. In that case, the items in the shopping cart are moved from the shoppingCarts table to the details table. The tables upon which you will build JPA entities are shown in the upper line of the diagram. The tables shown at the bottom will be accessed from within the database tier or business logic tier directly, not through JPA entities.

function myfunc(func) { func(); } myfunc(el.methodname); The path of execution bounces around, so let s step through it: 1. Create an el object and assign it a method called methodname(). If you were to run el.methodname() now, you d get the el object. 2. Create a function called myfunc() that accepts one parameter. The function expects the parameter to be a function that it can execute. 3. Run the function passing the method of the el object in as a parameter. The myfunc() function then executes the method. Here s where it s a little confusing. Even though you are executing el.methodname(), you passed in a reference only to the function, not to the whole object. Therefore, when you execute the function and it tries to alert this, it returns the window object because myfunc() belongs to the window object. This can be both an advantage and a disadvantage, depending on what your needs are. Luckily, JavaScript offers a call() method that enables you to execute a method in the context of another object: function myfunc(func) { func.call(el); } In this example, the func function gets executed but in the context of the el object. Therefore, when using this, it refers to el. Many of the JavaScript libraries out there create their own methods for binding objects (this topic is discussed in more detail in 3). Coming back to the example, you need to update the addListener() function to use call() to pass through the correct context. An anonymous function is used to encapsulate the reference: function addListener(element, event, listener) { if (element.addEventListener){ element.addEventListener(event, listener, false); } else if (element.attachEvent){ element.attachEvent('on'+event, function(){listener.call(element)}); } }

Figure 5-2. Create New Database dialog box The dialog box asks you to enter a name for the database. It informs you that the database name must contain only lowercase characters (a z), digits (0 9), or any of the characters _, $, (, ), +, -, and /. As a general rule of thumb, I prefer to name databases using only lowercase characters and the underscore (_) character. This avoids any potential issues with URL encoding and escaping characters when using the API. In this dialog box, enter books in the Database Name field, and click the Create button. CouchDB will create a new database with the name books and will take you directly to its Futon page, http://127.0.0.1:5984/_utils/database.html books. Figure 5-3 shows the default view of this page.

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