October 1999
Intermediate to advanced
480 pages
14h 47m
English
Content preview from JavaScript Application CookbookBecome an O’Reilly member and get unlimited access to this title plus top books and audiobooks from O’Reilly and nearly 200 top publishers, thousands of courses curated by job role, 150+ live events each month,
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Step 1: Loading Shopping Bag
JavaScript and the resident browser take care of most of the work here, although the user plays a small part. Consider the first page loaded—index.html. You can see what it looks like in Example 8.1.
Example 8-1. index.html
1 <HTML>
2 <HEAD>
3 <TITLE>Shopping Bag</TITLE>
4 <STYLE TYPE="text/css">
5 <!--
6 #welcome { text-align: center; margin-top: 150}
7 //-->
8 </STYLE>
9 <SCRIPT LANGUAGE="JavaScript">
10 <!--
11 var shopWin = null;
12 var positionStr = '';
13 function whichBrowser() {
14 if(navigator.appVersion < 4) {
15 alert("You need MSIE 4.x or Netscape Navigator 4.x to use " +
16 "Shopping Bag.")
17 return false;
18 }
19 return true;
20 }
21
22 function launch() {
23 if(!whichBrowser()) { return; }
24 if(navigator.appName == "Netscape")
25 { positionStr = ",screenX=0,screenY=0"; }
26 else { positionStr = ",fullscreen=yes"; }
27 if(shopWin == null) {
28 shopWin = open("shopset.html", "", "width=" + screen.width +
29 ",height=" + screen.height + positionStr);
30 }
31 }
32 function closeUpShop() {
33 if (shopWin != null) {
34 if (typeof(shopWin) == "object") {
35 shopWin.close();
36 }
37 }
38 }
39 window.onunload = closeUpShop;
40 //-->
41 </SCRIPT>
42 </HEAD>
43 <BODY>
44 <DIV ID="welcome">
45 <H1>Welcome to Shopping Bag!!!</H1>
46 <A HREF="javascript: launch();">Begin</A>
47 </DIV>
48 </BODY>
49 </HTML>That might seem like a lot of JavaScript for a page that prints only five words on the screen; however, the additional code makes for a slightly ...
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I'm always learning. So when I got on to O'Reilly, I was like a kid in a candy store. There are playlists. There are answers. There's on-demand training. It's worth its weight in gold, in terms of what it allows me to do.