Tài liệu Javascript bible Chapter 43 ppt

... </P>). Each of these objects has a set of properties, methods, and event handlers. 43 43 CHAPTER ✦ ✦ ✦ ✦ In This Chapter The Internet Explorer document object model Working with the style object ... width:1;} </STYLE> <SCRIPT LANGUAGE=" ;JavaScript& quot;> //var engaged = false var offsetX = 0 var offsetY = 0 (continued) 902 Part IV ✦ Putting JavaScript to Work L...

Ngày tải lên: 17/01/2014, 08:20

... handler, define an empty function and set the URL to that 343 Chapter 17 ✦ Link and Anchor Objects empty JavaScript function (such as HREF= javascript: doNothing()” ). Starting with Navigator 3, you ... 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 javascr...

Ngày tải lên: 10/12/2013, 15:15

... 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

... representations of two operands 32 32 CHAPTER ✦ ✦ ✦ ✦ In This Chapter Understanding operator categories Role of operators in script statements ✦ ✦ ✦ ✦ 674 Part III ✦ JavaScript Object and Language Reference Boolean ... 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...

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

... 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 Part IV ✦ Putting JavaScript ... for Data Validation I devoted an entire chapter to the subject of data validation because it represents the one area of error checking that almost all JavaScript authors...

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

... script function. The technique involves a pseudo-URL called the javascript: URL. If you place the name of a function after the javascript: URL, a scriptable browser runs that function. So as ... from the function. Remember this javascript: URL technique for all tags that include HREF and SRC attributes: If an attribute accepts a URL, it can accept this javascript: URL as well. This can ....

Ngày tải lên: 24/01/2014, 09:20