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A function used in conjunction with the new operator is called a constructor. In JavaScript, constructors are one of the preferred approaches to creating custom objects, as we ll discuss in section 3.1.4. In the body of a constructor, the this keyword references the newly created instance. If the newly created instance defines methods, the this keyword inside the methods points to the instance itself.

For this application, you need to retrieve the tasks that are currently stored in the database when the application first loads. To do this, you need a simple view that you shall call get_tasks. Open your shell window, and navigate to your couchtasks directory. From here, issue the following commands to set up your view file structure: mkdir views/get_tasks touch views/get_tasks/map.js Now open the map.js file in your text editor, and add the code in Listing 10-8 to it. Listing 10-8. map.js function(doc) { emit(doc.desc, doc); } Save your changes to the map.js file before continuing. Next, you need to modify your main.js file (in the couchtasks/_attachments/script directory) to tell your application to load existing data on launch. The new content of main.js is shown in Listing 10-9. Listing 10-9. main.js $.CouchApp(function(app) { $('form#add_task').submit(function(e) { e.preventDefault(); var newTask = { desc: $('#desc').val() } if(newTask.desc.length > 0) { app.db.saveDoc(newTask, { success: function(resp) { $('ul#my_tasks').append('<li>'+newTask.desc+'</li>'); $('ul#my_tasks li:last').hide().fadeIn(1500); $('#desc').val(''); var task_count = parseInt($('#task_count span').html(), 10); task_count++; $('#task_count span').html(task_count); }}); } else { alert('You must enter a description to create a new task!'); } }); app.view("get_tasks", { success: function(json) { json.rows.map(function(row) {

Figure 8-7. The Calendar icon appears on the top row of your iPod touch home screen and shows the current date.

Knowing which object is referenced by this in a function is fundamental in order to determine which variables, objects, and properties you can access in the body of the function. In chapter 2, we discussed client delegates, which make it possible to change the object referenced by this in a function. To make things even more interesting, JavaScript functions can be nested and even bound to a scope. Closures One of the characteristics of JavaScript functions is that they can be nested. This means you can declare a function in another function. Consider the following code:

$('ul#my_tasks').append('<li>'+row.key+'</li>'); }); $('#task_count span').html(json.rows.length); }}); }); When you have saved main.js, push your application to CouchDB again using this: couchapp push . http://127.0.0.1:5984/couchtasks Now when you open CouchTasks in your web browser, you should see the task you previously entered. Next, let s make the list of tasks look a bit prettier with some padding and borders, and also let s add a delete button next to each task so that the user can delete the task from the database. First let s modify the main.css file (located in couchtasks/_attachments/style/main.css), adding some style sheet rules for the tasks list and the delete buttons you are going to create. Add the code in Listing 10-10 to the end of the main.css file. Listing 10-10. Code to Append to main.css ul#my_tasks { list-style: none; margin: 0; padding: 0; border: 1px solid #ccc; border-top: none; } ul#my_tasks li { list-style: none; display: block; padding: 10px; background-color: #fff; border-top: 1px solid #ccc; } ul#my_tasks div.desc { width: 80%; float: left; font-size: 1.1em; } ul#my_tasks li div.link { width: 20%; float: left; text-align: right; }

The Calendar application offers three basic views: List, Day, and Month. Each of these helps you locate and review your appointments.

function parent(arg) { var testVariable = "I am a test variable.";