906 Part III . Document Objects Reference attributes in the tag, these properties can adjust the size of the applet padding after the fact in IE5+. Related Items: height, width properties. name Value: String Read-Only NN2 NN3 NN4 NN6 IE3/J1 IE3/J2 IE4 IE5 IE5.5 Compatibility . . The name property represents the NAMEattribute, a holdover from the early implementations of the APPLET element before IDattributes were used to identify elements. The value assigned to the NAME attribute is the name you can use to reference applets in all browsers that support accessing applets: document.appletName. object Value: String Read-Only NN2 NN3 NN4 NN6 IE3/J1 IE3/J2 IE4 IE5 IE5.5 Compatibility . The object property represents the OBJECTattribute, which, according to the W3C HTML standard, points to the URL of a serialized (that is, saved ) version of the applet s current state. This attribute, and thus the associated property, may not be fully implemented in NN6. Related Items: code property. vspace See hspace. width See height. APPLET.width
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905Chapter 32 .Embedded Objects file). You cannot change the code assigned to an applet after the element has loaded (even if the applet code did not load successfully). Related Items: codeBase property. codeBase Value: String Read-Only NN2 NN3 NN4 NN6 IE3/J1 IE3/J2 IE4 IE5 IE5.5 Compatibility . . The codeBase property is the string of the path on the server to the Java class file that is to begin loading the applet (or the property may be the entire applet if it consists of a single class file). The actual Java class file name is not part of the codeBase property. Related Items: code property. heightwidth Value: Integer Read/Write NN2 NN3 NN4 NN6 IE3/J1 IE3/J2 IE4 IE5 IE5.5 Compatibility . . The height and widthproperties represent the HEIGHTand WIDTH attributes of the APPLET element. While these values should be set via attributes in the tag, these properties can adjust the size of the applet after the fact in IE5+. Related Items: hspace, vspace properties. hspace vspace Value: Integer Read/Write NN2 NN3 NN4 NN6 IE3/J1 IE3/J2 IE4 IE5 IE5.5 Compatibility . . The hspace and vspaceproperties represent the HSPACEand VSPACE attributes of the APPLET element, which control the number of pixels of transparent padding around the APPLET element on the page. While these values should be set via APPLET.hspace
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904 Part III . Document Objects Reference The alt property represents the ALTattribute, which should contain text that displays in the browser in the event that the applet does not load or the user has Java turned off in the browser preferences. This information should be set as the APPLET element s attribute, because assigning text to the property after the applet attempts to load does not insert the text into the page. Related Items: altHTML property. altHTML Value: String Read/Write NN2 NN3 NN4 NN6 IE3/J1 IE3/J2 IE4 IE5 IE5.5 Compatibility . . The altHTML property is supposed to provide an APPLET element with HTML content to render if the applet doesn t load. In practice, assigning an HTML string to this property has no effect on an APPLET element. Related Items: alt property. archive Value: String Read/Write NN2 NN3 NN4 NN6 IE3/J1 IE3/J2 IE4 IE5 IE5.5 Compatibility . The archive property represents the ARCHIVEattribute, which points to the URL of a compressed (.zip) file containing Java class files needed for the applet. The archive must include the class file that is assigned to the CODEattribute to get the applet loaded and started. Related Items: code property. code Value: String Read-Only NN2 NN3 NN4 NN6 IE3/J1 IE3/J2 IE4 IE5 IE5.5 Compatibility . . The code property is the URL string of the Java class file that is to begin loading the applet (or the property may be the entire applet if it consists of a single class APPLET.code
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903Chapter 32 .Embedded Objects Although you cannot query an applet to find out whether it s loaded (as you can with an image), you can rely on the onLoadevent handler of a window to fire only when all applets in the window are loaded and running (with the occasional version- or platform-specific bug in frames, as described in the window.onLoadevent handler discussion in Chapter 16). IE4+ also features an onLoadevent handler for the APPLET element directly, but applets tend to be the last things to load on a page. Therefore, you won t be able to use an applet embedded in a document to help you create the HTML content of that page as it loads, but an applet can provide content for new documents or for modifiable elements of a page. With the highly dynamic object models of IE4+ and NN6, this can lead to all kinds of possibilities. Java applets have also been used to maintain contact with a server after the page has loaded by way of a servlet running on the server. A servlet allows the applet to query or be refreshed with instantaneously updated information without having to reload the page. Of course, getting a sophisticated applet to run in a wide range of browsers and operating systems is a challenge unto itself. A large set of event handlers for this element (all but onLoadand onScroll) is related to the application of IE/Windows data binding for PARAM elements nested inside an APPLET element. These events fire when a variety of actions occur to the data source or recordset associated with the applet. For more about applying data binding to an APPLET element, see http://msdn.microsoft.com/workshop/ author/databind/dataconsumer.asp. Properties align Value: String Read/Write NN2 NN3 NN4 NN6 IE3/J1 IE3/J2 IE4 IE5 IE5.5 Compatibility . . The alignproperty controls either the horizontal or vertical alignment of the element with regard to surrounding content. String values of leftor rightcause the applet rectangle to cling to the left or right edges of its next outermost positioning context. String values of absbottom, absmiddle, baseline, bottom, middle, text- top, or topinfluence the vertical alignment with respect to adjacent text, with the same kind of results as corresponding values of the style.verticalAlignproperty. Related Items: style.verticalAlign property. alt Value: String Read/Write NN2 NN3 NN4 NN6 IE3/J1 IE3/J2 IE4 IE5 IE5.5 Compatibility . APPLET.alt
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902 Part III . Document Objects Reference APPLET Element Object For HTML element properties, methods, and event handlers, see Chapter 15. Properties Methods Event Handlers align (Applet methods) onCellChange alt onDataAvailable altHTML onDatasetChanged archive onDatasetComplete code onLoad codeBase onRowEnter height onRowExit hspace onRowsDelete name onRowsInserted object onScroll vspace width (Applet variables) Syntax Accessing APPLET element object properties or methods: (NN3+/IE4+) [window.]document.appletName.property | method([parameters]) (NN3+/IE4+) [window.]document.applets[index].property | method([parameters]) (IE4+) [window.]document.all.appletID.property | method([parameters]) (IE5+/NN6) [window.]document.getElementById( appletID ).property | method([parameters]) About this object Starting with NN3 and IE4, Java applets are treated as scriptable objects. While IE4+ treats both the applet and the APPLET element as objects, NN3 and NN4 offered access to only one property of the APPLET element object (name). In NN6, however, many more APPLET object properties are also scriptable. The fact that the applet, itself, can expose public instance variables and public methods as properties and methods of the applet object means that the scriptable characteristics of an appletobject are highly dependent upon the way the applet was written. You can learn more about how to compose an applet that exposes its innards to JavaScript in Chapter 44. Perhaps the most important point to remember about accessing applets is that you must have them loaded and running before you can address them as objects. APPLET
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32 CHAPTER Embedded Objects …. In addition to the typical content that you see in Web pages primarily text and images you can embed other kinds of content into the page. Such embedded content usually requires the powers of additional software, such as plug-in players or other external code processors, to load and display the content. All of this external content is added to a page by one of three HTML elements: APPLET, EMBED, or OBJECT. In the HTML 4.0 standard, the APPLET element, which was intended originally for loading Java applets, is deprecated in favor of the newer OBJECT element. An OBJECT element is intended to be more extensible, meaning that it has enough attributes and power to summon the Java virtual machine if the incoming code is a Java applet, or run an ActiveX program (in IE for Windows, that is). The EMBED element is commonly used to display a plug-in control panel directly in the document, rather than having the panel appear in a separate window. In all cases, when a visual element is embedded via any of these elements, the control panel or applet occupies a segregated rectangular space on the page and generally confines its activities to that rectangle. But in many cases, JavaScript can also interact with the content or the player, allowing your scripts to extend themselves with powers for actions, such as controlling audio playback or the operation of a Java applet. This chapter s primary focus is not on the content and players that you can control as it is on the HTML element objects that load the content or players into the page in the first place. Most of the properties represent nothing more than scriptable access to the element HTML attributes. The property descriptions in this chapter are therefore not extensive. Online HTML references (including the W3C HTML 4.0 specification and the Microsoft Developer Network documentation) should fill in the attribute value information quite well. In practice, scripts have very little interaction with these element objects, but if you ever need to know what s scriptable, you ll find that information here. As for controlling applets and plug-ins, you can find information about that in Chapter 44. In This Chapter Using EMBED element objects Exploring the OBJECT element object Understanding the unusual PARAM element ….
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899Chapter 31 .Positioned Objects Sometimes the effects are there just for the sake of looking (at first anyway) cool or because the page author knows how to script those effects. Your chief guide in implementing such features, however, should be whether the scripting genuinely adds value to the content offering. If you don t improve the content by adding a flying doo-dad or pulsating images, then leave them out. A greater challenge is finding meaningful ways to apply positioning techniques. Done the right way and for the right reason, they can significantly enhance the visitor s enjoyment of your application. …
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898 Part III . Document Objects Reference Listing 31-22 (continued) offsetY += document.body.scrollTop } } return false } } } function release(evt) { evt = (evt) ? evt : (window.event) ? window.event : var targElem = (evt.target) ? evt.target : evt.srcElement if (targElem.className == draggable ) { while (targElem.id != myLayer && targElem.parentNode) { targElem = targElem.parentNode } if (engaged && targElem.id == myLayer ) { engaged = false } } }

Resizing a Layer (W3C)

897Chapter 31 .Positioned Objects var offsetX = 0 var offsetY = 0 function resizeIt(evt) { evt = (evt) ? evt : (window.event) ? window.event : var targElem = (evt.target) ? evt.target : evt.srcElement if (targElem.className == draggable ) { if (engaged) { if (evt.pageX) { targElem.style.width = (evt.pageX - targElem.offsetLeft offsetX) + px targElem.style.height = (evt.pageY - targElem.offsetTop offsetY) + px } else { var elemWidth = evt.clientX - targElem.offsetLeft - offsetX (parseInt(targElem.style.left) parseInt(targElem.offsetLeft)) var elemHeight = evt.clientY - targElem.offsetTop - offsetY (parseInt(targElem.style.top) parseInt(targElem.offsetTop)) targElem.style.width = elemWidth + px targElem.style.height = elemHeight + px } } } } function engage(evt) { evt = (evt) ? evt : (window.event) ? window.event : var targElem = (evt.target) ? evt.target : evt.srcElement if (targElem.className == draggable ) { while (targElem.id != myLayer && targElem.parentNode) { targElem = targElem.parentNode } if (targElem.id == myLayer ) { if (evt.pageX && (evt.pageX > ((parseInt(targElem.style.width) - 20) + targElem.offsetLeft)) && (evt.pageY > ((parseInt(targElem.style.height) - 20) + targElem.offsetTop))) { offsetX = evt.pageX - parseInt(targElem.style.width) targElem.offsetLeft offsetY = evt.pageY - parseInt(targElem.style.height) targElem.offsetTop engaged = true } else if ((evt.offsetX > parseInt(targElem.style.width) - 20) && (evt.offsetY > parseInt(targElem.style.height) - 20)) {offsetX = evt.offsetX - parseInt(targElem.style.width) document.body.scrollLeft offsetY = evt.offsetY - parseInt(targElem.style.height) document.body.scrollTop engaged = true if (navigator.userAgent.indexOf( Win ) == -1) { offsetX += document.body.scrollLeft Continued
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896 Part III . Document Objects Reference Listing 31-21 (continued) if (targElem.className == draggable ) { while (targElem.id != myLayer && targElem.parentNode) { targElem = targElem.parentNode } if (engaged && targElem.id == myLayer ) { engaged = false } } }

Dragging a Layer