java code 39 barcode 5: Browsers in Java

Drawing ECC200 in Java 5: Browsers

5: Browsers
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as well as enhanced document processing programs that work across multiple DOM-compliant browsers In this chapter, we will examine the DOM support of the major web browsers available today: Microsoft Internet Explorer 6, Netscape Navigator 6, and Opera 6 All the major browsers available today support at least some of the W3C DOM specification Microsoft Internet Explorer 6 and Netscape 6x provide the most comprehensive support Opera 6 supports some of the more important DOM API methods but does not yet provide a full implementation Although the majority of the code examples in this chapter will work in all three of the major browsers, some will not; those that do not will be noted
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Microsoft Internet Explorer 6
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With the introduction of Internet Explorer 6, Microsoft provides full support for DOM Level 1 in its flagship web browsing application Internet Explorer 6 provides full support for the Core and HTML interfaces of DOM Level 1, along with CSS (Cascading Style Sheets) 1 In addition, IE6 supports the DOM Level 2 method getElementById(), along with several nonstandard properties and methods for developers convenience that are not included in the W3C specification for DOM Level 1 Internet Explorer 6 fully supports the DOM Level 1 interfaces, so scripts can take full advantage of the DOM s capabilities, including creating page elements dynamically at runtime, discovering and changing the structure and content of a page, and modifying a page s appearance through style sheets
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Netscape Navigator 6x
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The venerable Navigator web browser produced by Netscape (now a part of America Online) received a hefty amount of DOM support in its latest revision (as of this writing, 621), which is based upon the open-source Mozilla project This latest version of the Netscape browser provides full support for DOM Level 1 and part of DOM Level 2, including the DOM 2 Events module Scripts can take advantage of the DOM s capabilities in Netscape Navigator just as they would in Internet Explorer Scripts can discover the structure and content of pages and make changes to a page s content at runtime In addition, because Navigator supports the DOM Level 2 Events module, script developers can attach event listeners to page elements (more on this later)
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The Document Object Model: Processing Structured Documents
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Opera 6
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The Opera browser, made by the Norwegian company Opera Software, does not yet (as of version 6) provide full support for the W3C DOM However, according to the company s website (wwwoperacom), they are working on providing support for DOM Level 1, along with many other public Internet standards Using Opera s current (as of this writing) DOM implementation, applications cannot currently modify the structure of the document or dynamically create new page elements at runtime They can, however, examine the document structure and discover its contents Opera 6 s support for DOM methods and properties is currently as follows On the document object: getElementsByTagName() getElementById() getElementsByName() On HTML elements: getElementsByTagName() contains() parentNode Most of the examples in this chapter will work with Opera 6, except where specifically noted
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Using the DOM in a Browser Environment
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The browsers discussed in this chapter use JavaScript as their native programming language, and each provides a JavaScript language binding for the DOM in its implementation of the W3C DOM specification Scripts do not have to do anything special to start using the DOM methods and structures provided by these browsers they are an inherent part of the JavaScript namespace within the browser and can be used in any script
5: Browsers
Obtaining a Reference to the Document
Scripts do not need to do anything special to obtain a reference to the document The JavaScript DOM binding provides a document keyword that represents the document object of the document in the current browser window Browser scripts are always run in the context of being embedded in a document, so there is always a current document to refer to Scripts use this keyword to operate on the document itself and obtain references to its child nodes For example, consider the following code snippet, which will display the title of the document in an alert box when a form button is clicked:
<HTML> <HEAD> <TITLE>The DOM Explorer Page</TITLE> <SCRIPT LANGUAGE="JavaScript"> function buttonClick() { // "document" is a global keyword that refers to the document // "title" is a property of the DOM1 HTMLDocument interface alert(documenttitle); } </SCRIPT> </HEAD> <BODY BGCOLOR="#FFFFFF"> <H1>The DOM Explorer</H1> <FORM NAME="form1" METHOD="post" ACTION=""> <INPUT TYPE="BUTTON" NAME="Button" VALUE="Button" onClick="buttonClick()"> </FORM> </BODY> </HTML>
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