qr code scanner java download Figure 12-3 A possible result of using the random-quote script in Java

Maker QR Code 2d barcode in Java Figure 12-3 A possible result of using the random-quote script

Figure 12-3 A possible result of using the random-quote script
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Figure 12-4 Another possible result of using the random-quote script The first thing you need is an array of image Universal Resource Locator (URL) addresses (which can be local or absolute local addresses are used here) The array used for this script is shown in the following example code:
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var r_image= new Array(10); r_image[0]="image0gif"; r_image[1]="image1gif"; r_image[2]="image2gif"; r_image[3]="image3gif"; r_image[4]="image4gif"; r_image[5]="image5gif"; r_image[6]="image6gif"; r_image[7]="image7gif"; r_image[8]="image8gif"; r_image[9]="image9gif";
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This array sets up the addresses of images that can be displayed at random each time the page is loaded Next, you need a way to get a random integer between 0 and 9 This is the same as in the previous random-quote script:
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var rand_int= Mathfloor(Mathrandom()*10);
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The next step is to access the array in the body section of the document to show a random image from the array when the page is loaded in the browser The following code enables you to display the random image using the innerHTML property of a div element to write the img tag for a random image if JavaScript is available
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The HTML file is saved as random_imageshtml and the JavaScript file is saved as random_ imagesjs First, the HTML code:
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<body> <h1>My Random Image for You:</h1> <div id="my_image"> <img src="image0gif" alt="Random Image" /> </div> <script type="text/javascript" src="random_imagesjs"></script> </body>
Next, the JavaScript code:
var r_image= new Array(10); r_image[0]="image0gif"; r_image[1]="image1gif"; r_image[2]="image2gif"; r_image[3]="image3gif"; r_image[4]="image4gif"; r_image[5]="image5gif"; r_image[6]="image6gif"; r_image[7]="image7gif"; r_image[8]="image8gif"; r_image[9]="image9gif"; var i_div = documentgetElementById("my_image"); var rand_int = Mathfloor(Mathrandom()*10); i_divinnerHTML = '<img src="'+r_image[rand_int]+'" alt="Random Image" />';
As you can see, this is quite similar to the random-quote script You just needed to change the contents of the array and the statement to replace the contents of the innerHTML property to make the script display an image rather than a quote
NOTE
For this example, the images are saved as image0gif, image1gif, and so on; however, you could save your image files under any name you like
This discussion of the random() method could go on for some time because there are numerous things that you could randomize However, you now know the basics of how this feature works, so it s time to move on
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Math, Number, and Date Objects
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Will I ever have any use for any of the properties of the Math object They are all numbers that I don t even use! This depends on how often you perform different types of calculations It would be unlikely for you to use any of them as a beginner, but there are some scripts out there that use them for various advanced purposes, such as JavaScript calculators I have no interest in writing a calculator Do I really have to bother memorizing all the properties of the Math object Well, probably not, since a situation to use them probably won t come up all that often It is good to have a reference on hand just in case, though, and to know generally what they are since they appear in scripts on the Web from time to time Some of these properties and methods could be handy if I don t have a calculator around I could write a little script to calculate some things for myself, couldn t I Of course! Just be sure to double-check the numbers with something you know the answer to first to be sure that there are no mistakes in your code The random() method is fun so far, but I can t think of anything else I could use it for Could you give me some ideas for using it to do other things There are a number of other things you could use it for You can randomize pretty much anything that can be displayed with an HTML tag or plain text, so try out some ideas and see if they work for you Here are some thoughts off the top of my head for you, though: random links, random linked images, random tasks for a JavaScript game of some sort (like rolling dice or drawing a card), random page greetings, random alerts and I m sure there are plenty more
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