Tài liệu Javascript bible Chapter 12 ppt

... script could 12 12 CHAPTER ✦ ✦ ✦ ✦ In This Chapter How to precache images How to swap images for mouse rollovers What you can do with Dynamic HTML and scripting ✦ ✦ ✦ ✦ 2 Part II ✦ JavaScript Tutorial change ... type this listing — as I 3 Chapter 12 ✦ Images and Dynamic HTML strongly recommend — you can obtain copies of the four image files from the companion CD-ROM in the Chapter...

Ngày tải lên: 24/01/2014, 10:20

... scripts, the JavaScript object world begins to wrap around itself in a way. Despite all the attributes that define a link, JavaScript regards a link as the same as a location object (Chapter 15). ... direct the URL to a JavaScript function. The URL javascript: functionName() is a valid location parameter for the HREF attribute (and not just in the link object). Using the javascript:...

Ngày tải lên: 10/12/2013, 15:15

... (12. 19), kg.1098.1 d))s1064.8d)(7.224(()kgmN10673.6( m)1008.1(44 30 242211 3 112 2 32 S       GT r m 12. 35: a) The result follows directly from Fig. 12. 18. b) m)1092.5)(248.01( 12  m,1045.4 12  y.248c) m.104.55m)1050.4)(010.01( 121 2  T 12. 36: ... result. 12. 3: . )( ))(( 12 2 12 21 2 12 21 F r mm G nr nmnm G  12. 4: The separation of the centers...

Ngày tải lên: 21/12/2013, 03:15

... introduction to data types and values in Chapter 6’s tutorial scratched the surface of JavaScript s numeric and Boolean powers. In this chapter, you look more closely at JavaScript s way of working with ... detail in Chapter 32), JavaScript includes more advanced mathematical powers that are accessed in a way that may seem odd to you if you have not programmed in true object- Note 57...

Ngày tải lên: 21/12/2013, 05:17

... possible in JavaScript. JavaScript control structures follow along the same lines of many programming languages, particularly with additions made in Navigator 4 and Internet Explorer 4 (for JavaScript 1.2). ... condition to test, and then the statements that execute if the condition yields a 31 31 CHAPTER ✦ ✦ ✦ ✦ In This Chapter How to branch script execution down multiple paths Loop...

Ngày tải lên: 21/12/2013, 05:17

... all versions of JavaScript before 1.2, when your script tries to compare string values consisting of numerals and real numbers (for example, 123 ” == 123 or 123 ” != 123 ), JavaScript anticipates ... the user’s data entry has been validated enough for JavaScript to know that the entry is a number. Now the function must 677 Chapter 32 ✦ JavaScript Operators check whether the num...

Ngày tải lên: 21/12/2013, 05:17

... Netscape’s JavaScript Debugger, described in Chapter 46). The methods are watch() and unwatch(). The watch() method instructs JavaScript to keep an eye on a particular property in an object (any JavaScript- accessible ... See Chapter 13 for details on this convenient way to share utility functions among many documents. 714 Part III ✦ JavaScript Object and Language Reference Custo...

Ngày tải lên: 17/01/2014, 08:20

... another type. 35 35 CHAPTER ✦ ✦ ✦ ✦ In This Chapter Converting strings into object references Converting strings to numbers for math Adding comments to scripts ✦ ✦ ✦ ✦ 728 Part III ✦ JavaScript Object ... can be used anywhere in a script. If you’ve read earlier chapters, you have been introduced to many of these functions and statements. This chapter is presented as a convenient plac...

Ngày tải lên: 17/01/2014, 08:20

... months are entered from 1 to 12 and dates from 1 to 31. I’ll take care of aligning exact month lengths later. if (mm < 1 || mm > 12) { // month value is not 1 thru 12 alert("Months must ... the 37 37 CHAPTER ✦ ✦ ✦ ✦ In This Chapter Validating data as it is being entered Validating data immediately prior to submission Organizing complex data validation tasks ✦ ✦ ✦ ✦ 768 Par...

Ngày tải lên: 17/01/2014, 08:20

... or the JavaScript code (JavaScript s string.split() and array.join() methods help a great deal here). 786 Part IV ✦ Putting JavaScript to Work Data type conversions The example in this chapter ... back to JavaScript, that passed object is converted to its original JavaScript object type. But objects of other classes are passed as their native objects wrapped in JavaScript “clothin...

Ngày tải lên: 17/01/2014, 08:20