Creating while Loop Statements

There are other loops besides the for loop in JavaScript, such as the while loop. The while loop tests a condition each time the loop is executed. If the condition is true, it executes the code in the loop. Here's what this loop looks like in outline:

 while (  condition  ){  code  }

For example, here's how you write the example we used in the discussion of for loops as a while loop:

Listing ch06_09.html

 <HTML>      <HEAD>         <TITLE>             Using the while Statement         </TITLE>     </HEAD>     <BODY>         <CENTER>             <H1>                 Using the while Statement             </H1>         </CENTER>         <SCRIPT LANGUAGE = "JavaScript">  var loopIndex = 0   while(loopIndex < 10){   loopIndex++   document.writeln("The loop index value is " +   loopIndex + "<BR>")   }  </SCRIPT>     </BODY> </HTML>

You can see the results of this code in Figure 6-9.

Figure 6-9. Using a JavaScript `while` loop in Internet Explorer.

graphics/06fig09.gif

Creating while Loop Statements

Creating while Loop Statements

Listing ch06_09.html

Figure 6-9. Using a JavaScript while loop in Internet Explorer.

Figure 6-9. Using a JavaScript `while` loop in Internet Explorer.