vb.net barcode maker Ajax: A Beginner s Guide in Java

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Ajax: A Beginner s Guide
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Besides +=, there are also *=, =, and other compound assignment operators, as you see in Table 2-1 Note the operators like ==, <, and > in Table 2-1 What are they for They re the comparison operators, and they let you make decisions in your code (Is the temperature less than 72 Yes Time for a picnic!) with the if statement, coming up next
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Grooving with the if Statement
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This if statement is the first statement we ll see that lets you execute code depending on whether or not a condition (that you set) is true Here s what the if statement looks like formally (the parts in square brackets are optional, and you replace the parts in italics with your own JavaScript):
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if (condition) { statements1 } [else { statements2 }]
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Let s see an example to make this clear Do you have more than $1,000,000 in your bank account If so, this next example will display the message Time for a vacation! (this is ifhtml):
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<html> <head> <title>Using the if statement</title> <script language="javascript"> function display() { var account = 2000000; if(account > 1000000) { documentgetElementById('targetDiv')innerHTML = "Time for a vacation!"; } } </script> </head> <body> <h1>Using the if statement</h1> <input type="button" onclick="display()" value="Click Here">
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<div id="targetDiv"> </div> </body> </html>
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Getting to Know JavaScript
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You can see the results in Figure 2-10, where it s time for a vacation How does this code work You start off by putting the number two million into a variable named account:
var account = 2000000;
And then you check to see if account holds more than $1 million by using the > (greater than) comparison operator:
var account = 2000000; if(account > 1000000) { }
If account is greater than one million (and it is), JavaScript executes the code in the curly braces, which displays the text Time for a vacation! :
var account = 2000000; if(account > 1000000) { documentgetElementById('targetDiv')innerHTML = "Time for a vacation!"; }
And that s the way if statements let you make decisions in your code, executing code or not, depending on whether or not a condition is true
Figure 2-10
ifhtml
Ajax: A Beginner s Guide
Try This
Test the if Statement
Try your own version of the ifhtml example, creating a file named temperaturehtml In your version, create a variable named temperature and assign it a value Then test to see if that value is over 65, and if so, display the message Time for a picnic!
Using the else Statement
What if you don t happen to have more than $1 million in the bank In other words, what if the condition you re checking (account > 1000000) is false If you want to execute code when the if statement s condition is false, you can add an else statement For example, if you don t have $1 million in the bank, you might want to display the (rather harsh) message Get back to work! You can do that by enclosing inside curly braces in an else statement (which must follow an if statement) the code that you want to run if the if statement s condition is false, like this (this is elsehtml):
<html> <head> <title>Using the else statement</title> <script language="javascript"> function display() { var account = 500000; if(account > 1000000) { documentgetElementById('targetDiv')innerHTML = "Time for a vacation!"; } else { documentgetElementById('targetDiv')innerHTML = "Get back to work!"; } } </script> </head> <body> <h1>Using the else statement</h1> <input type="button" onclick="display()" value="Click Here"> <div id="targetDiv"> </div> </body> </html>
2:
Getting to Know JavaScript
Figure 2-11
elsehtml
Note that we ve changed the amount in the account variable (regretfully) to 500,000, so you get the results shown in Figure 2-11 when you run this code Ah well
Try This
Test the else Statement
Try modifying your temperaturehtml file so that it can handle the case where the temperature is less than 65 degrees In that case, make your code display the message Turn up the heat!
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