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CHAPTER 6 Strings
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Names are copied into elements of an array using the split() method
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Copying a Substring
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Now you ve learned how to divide a string into many substrings by using the split() method and a string called a delimiter This is useful when you are separating a string containing data elements into individual data elements However, the split() method isn t of much use to you if you need to copy one substring For this, you ll need to use one of two other methods: substring() and substr() Let s say, for example, that you built a client contact application that is used by sales representatives to track activities with their corporate clients This application prompts the sales representative to enter the client s e-mail address and corporate web site URL However, the application guesses the corporate web site URL based on the e-mail address and uses it as the default value for the prompt to enter the corporate web site Here s the string that the sales representative entered that contains the e-mail address:
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EmailAddress = 'bsmith@xyzcom '
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There is a good chance that the wwwxyzcom is the corporate web site for this client Your job is to copy the substring 'xyzcom' from the e-mail address and then concatenate the substring with 'www' to form the new string 'wwwxyzcom'
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First, we ll see how this is done using the substring() method The substring()is a method of a string object that copies a substring from a string based on a beginning and an end position that is passed as an argument to the substring() method The starting position speci es the rst character that is returned by the substring() method that is, the rst character in the substring The end position speci es the character that follows the last character that is returned by the substring() method that is, the position of the character that comes after the last character that you want to include in the substring This is a little tricky to understand, so take a look at the e-mail address string again:
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'bsmith@xyzcom '
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The last character in the string is a space This is the fteenth character in the string We want the substring 'xyzcom' (Notice this is without the space) The end position that we need to pass to the substring() method is 14 (zero-based) because the fteenth character is the character that comes after the m the space The m is the last character we want to include in our substring Here s how to write the substring() method:
var NewSubstring = StringNamesubstring (StartingPosition, EndPosition)
The following example illustrates how to create a substring using the substring() method The e-mail address is assigned to a variable The substring() method then copies the substring 'xyzcom' to the NewSubstring variable, which is concatenated to 'www' and assigned to the GuessWebSite variable The GuessWebSite is then used as the default value for the prompt() function, which asks the sales representative to enter the client s web site URL into the application (Figure 6-7)
Figure 6-7
The substring 'xyzcom' is concatenated to 'www' to form the client s web site
CHAPTER 6 Strings
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 10 Transitional//EN"> <html xmlns="http://wwww3org/1999/xhtml"> <head> <title>Using substring()</title> </head> <body> <script language="Javascript" type="text/javascript"> <!-var EmailAddress = 'bsmith@xyzcom ' var NewSubstring = EmailAddresssubstring(7,14) var GuessWebSite = 'www' + NewSubstring var WebSite = prompt('Enter the client web site', GuessWebSite ) --> </script> </body> </html>
In the real world, you probably won t know the starting position and end position of characters for your substring, because a user can enter any length string into your application You can overcome this problem by using the substr() method along with other string object methods that you already learned how to use in this chapter The substr() method returns a substring You must tell it the starting position of the rst character that you want to include in the substring and how many characters you want copied into the substring from the starting position Both positions are passed as arguments to the substr() method Here s how you write the substr() method:
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