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an anonymous function to a property lets you invoke it through the property itself:

The iPod Stopwatch utility (see Figure 8-5) allows you to time events. On the Stopwatch screen, tap Start to begin the timer, Tap Lap to mark the latest lap time. The laps appear as a scrolling list at the bottom of the screen. Tap Stop to pause. Tapping Reset returns the timer to 00:00.0.

Figure 10-7. The restyled CouchTasks interface So, now the application looks pretty, but you ll notice that it still doesn t actually do anything. Let s implement the New Task form so that it creates new task documents in the CouchDB database. To do this, you need to create some JavaScript code. You could insert this directly into the index.html file, but to keep your code manageable, you ll create a separate JavaScript file and link to that from the index.html file. In your terminal or shell, navigate to the _attachments subdirectory within your couchtasks folder. Currently, there should be just the index.html file and style subdirectory in this location. Let s create a second subdirectory called script and create a file named main.js inside it: mkdir script cd script touch main.js Now open this main.js file, and add the code from Listing 10-6 to it.

sum holds 8 var sum = calculator.add(3, 5); var product = calculator.multiply(3, 5); product holds 15

Figure 8-5. The Stopwatch application allows you to keep track of lap times in a scrolling list at the bottom of the screen. Tap Start to start, Stop to Stop, Lap to end a lap, and Reset to return the time to zero and erase the lap times.

Listing 10-6. 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!'); } }); }); Let s briefly walk through what this code does. First you are opening an instance of CouchApp, which will automatically set up the database and design document variables for you. Within this, you are capturing the submit event of the form with the ID add_task. In this function, you first prevent the default action from being performed (in this case the form being submitted). You then build up your new task s document in JSON format, using the value of the Description textarea field for the value of the desc field. Next, you check that the user has actually entered something in the Description field, displaying an error message if not. If all appears fine, you save the document to the CouchDB database. When CouchDB returns and confirms that the document was saved correctly, you add your new task to the My Tasks section of the page. You then clear the description textarea value and increase the task count above your list of tasks. Before you push the application to CouchDB, you need to make a small modification to the index.html file to tell it to read your new JavaScript file. The new line is highlighted in bold in Listing 10-7.