Difference between revisions of "JavaScript Flow Control and Looping"
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One of the most powerful features of JavaScript (and every other programming or scripting language for that matter) is the ability to build intelligence into your web pages. It is vital in constructing scripts to be able to have the script make decisions and repeat tasks until specified criteria are met. For example, if you are developing an e-commerce application you may want to repeatedly ask a user to enter a credit card number until a valid credit card number is entered. Alternatively, you may want your script to loop a specifc number of times through a task before moving on to the next part of the script. All of this logic and flow control is achieved using some very simple structures. These are: | One of the most powerful features of JavaScript (and every other programming or scripting language for that matter) is the ability to build intelligence into your web pages. It is vital in constructing scripts to be able to have the script make decisions and repeat tasks until specified criteria are met. For example, if you are developing an e-commerce application you may want to repeatedly ask a user to enter a credit card number until a valid credit card number is entered. Alternatively, you may want your script to loop a specifc number of times through a task before moving on to the next part of the script. All of this logic and flow control is achieved using some very simple structures. These are: | ||
| − | + | Conditional Statements | |
| − | + | * if statements | |
| − | + | * if ... else ... statements | |
| − | + | Looping Statements | |
| − | + | * do ... while loops | |
| − | + | * while ... do loops | |
| − | + | switch Statements | |
| − | + | label Statements | |
| − | + | with Statements | |
Revision as of 15:06, 23 April 2007
One of the most powerful features of JavaScript (and every other programming or scripting language for that matter) is the ability to build intelligence into your web pages. It is vital in constructing scripts to be able to have the script make decisions and repeat tasks until specified criteria are met. For example, if you are developing an e-commerce application you may want to repeatedly ask a user to enter a credit card number until a valid credit card number is entered. Alternatively, you may want your script to loop a specifc number of times through a task before moving on to the next part of the script. All of this logic and flow control is achieved using some very simple structures. These are:
Conditional Statements
- if statements
- if ... else ... statements
Looping Statements
- do ... while loops
- while ... do loops
switch Statements
label Statements
with Statements
