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CHAPTER 4 Arrays
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The browser returns to the top of the for loop and increments (i++) the value of i, making its value 1 The browser evaluates the conditional expression and determines whether or not to execute the statement within the for loop again It decides to execute the statement The browser continues to loop until the value of i is equal to the length property When they are equal, the browser no longer enters the loop and skips to the statement at the end of the loop (Of course, there is no statement after the for loop in our example) Here s a tricky question Why does the browser stop entering the loop when it reaches the length of the array At rst glance, you would think that the browser skips the last array element But look closely and you ll see why this isn t true Remember that the value of the length property is the actual number of elements in the array, which is 4 in our example The for loop begins stepping through the array using an index of 0 The last (fourth) element of the array has an index of 3 Therefore, all the elements are processed within the for loop Try the following JavaScript and see how the browser displays (Figure 4-1) elements of the products array on the screen
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<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 10 Transitional//EN"> <html xmlns="http://wwww3org/1999/xhtml"> <head> <title>Display Array Elements</title> </head> <body> <script language="Javascript" type="text/javascript"> <!-var products = new Array() products[0] = 'Soda ' products[1] = 'Water' products[2] = 'Pizza' products[3] = 'Beer' for (var i = 0; i < productslength; i++) { documentwrite(products[i] + '<br>') } --> </script> <noscript> <h1> JavaScript Required</h2> </noscript> </body> </html>
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Figure 4-1 Values of the products array are displayed on the screen
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Adding an Array Element
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On some occasions your JavaScript will need to increase the size of the array while your JavaScript is running Let s return to our JavaScript example that collected an order from a customer You don t know how many products the customer is going to order when your write the JavaScript This means that your JavaScript must be prepared to increase the array by one element each time the customer enters a new product Here s the problem How do you know what index to assign to the new array element The solution is to use the length property of the array, as illustrated here:
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products[productslength] = 'chips'
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Remember from the previous section of this chapter that the products array has four array elements Therefore, the value of the length property of the array is 4 This means that the value 'chips' is assigned to the products[4] element Now there are ve elements in the array An important point to remember is that the value of the length property of an array can be used as the index for the new array element You ll see how to increase an array by one element in 7, where you ll learn how to create an order entry form
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CHAPTER 4 Arrays
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Sorting Array Elements
The index of the array elements determines the order in which values appear in an array when a for loop is used to display the array Sometimes you want values to appear in sorted order, which means that strings will be presented alphabetically and numbers will be displayed in ascending order You can place an array in sorted order by calling the sort() method of the array object The sort() method reorders values assigned to elements of the array, regardless of the index of the element to which the value is assigned Here s what you need to do to sort an array: 1 Declare the array 2 Assign values to elements of the array 3 Call the sort() method This is illustrated in the following JavaScript, where the list of products is sorted alphabetically and displayed on the screen (Figure 4-2)
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 10 Transitional//EN"> <html xmlns="http://wwww3org/1999/xhtml"> <head> <title>Display Array Elements Sorted</title> </head> <body> <script language="Javascript" type="text/javascript"> <!-var products = new Array() products[0] = 'Soda ' products[1] = 'Water' products[2] = 'Pizza' products[3] = 'Beer' productssort() for (var i = 0; i < productslength; i++) { documentwrite(products[i] + '<br>') } --> </script> <noscript> <h1> JavaScript Required</h2> </noscript> </body> </html>
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