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L Label.htmlFor (Property) Label.htmlFor (Property) A means of associating the label with an Input object. Availability: DOM level 1 JavaScript 1.5 JScript 3.0 Internet Explorer 4.0 Netscape 6.0 Property/method value type: String primitive JavaScript syntax: -myLabel.htmlFor The value of this property should correspond with the ID=”…” HTML tag attribute for the tag that instantiates the Inputobject the label belongs to. LANG=”…” (HTML Tag Attribute) A tag attribute that specifies the international language of some content. This tag attribute allows the current national language to be overridden on a tag by tag basis if necessary. There are many values for international languages. Refer to the Language codes topic for a list of language code values. See also: Element.lang, Language codes Language codes (Definition) Language codes are used to define locale specific handling. The Element.lang property controls the locale specific text rendering. It allows special characters to be handled appropriately and special character sets to be supported properly according to the national language variants. Here is a partial list of some example language codes to be used with it: Code Language Country af Afrikaans Standard ar_AE Arabic U.A.E. ar_BH Arabic Bahrain ar_DZ Arabic Algeria ar_EG Arabic Egypt ar_IQ Arabic Iraq Table continued on following page 1283
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JavaScript Programmer’s Reference Property JavaScript JScript N IE Opera DOM HTML Notes accessKey 1.5 + 3.0 + 6.0 + 4.0 + 1 + - dataFld 1.5 + 3.0 + 6.0 + 4.0 + 1 + - dataFormatAs 1.5 + 3.0 + 6.0 + 4.0 + 1 + - dataSrc 1.5 + 3.0 + 6.0 + 4.0 + 1 + - form 1.5 + 3.0 + 6.0 + 4.0 + 1 + - htmlFor 1.5 + 3.0 + 6.0 + 4.0 + 1 + - tabIndex 1.5 + 3.0 + 6.0 + 4.0 + 1 + - Method JavaScript JScript N IE Opera DOM HTML Notes blur() 1.5 + 3.0 + 6.0 + 4.0 + 1 + - click() 1.5 + 3.0 + 6.0 + 4.0 + 1 + - Event name JavaScript JScript N IE Opera DOM HTML Notes onBlur 1.5 + 3.0 + 6.0 + 4.0 + Warning onClick 1.5 + 3.0 + 6.0 + 4.0 + 4.0 + Warning onDblClick 1.5 + 3.0 + 6.0 + 4.0 + 4.0 + Warning onDragStart 3.0 + 4.0 + - onFilterChange 3.0 + 4.0 + - onFocus 1.5 + 3.0 + 6.0 + 4.0 + Warning onHelp 3.0 + 4.0 + Warning onKeyDown 1.5 + 3.0 + 6.0 + 4.0 + 4.0 + Warning onKeyPress 1.5 + 3.0 + 6.0 + 4.0 + 4.0 + Warning onKeyUp 1.5 + 3.0 + 6.0 + 4.0 + 4.0 + Warning onMouseDown 1.5 + 3.0 + 6.0 + 4.0 + 4.0 + Warning onMouseMove 1.5 + 3.0 + 6.0 + 4.0 + 4.0 + Warning onMouseOut 1.5 + 3.0 + 6.0 + 4.0 + 4.0 + Warning onMouseOver 1.5 + 3.0 + 6.0 + 4.0 + 4.0 + Warning onMouseUp 1.5 + 3.0 + 6.0 + 4.0 + 4.0 + Warning onSelectStart 3.0 + 4.0 + - Inheritance chain: Element object, Node object 1282
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L Label object (Object/HTML) See also: break, Code block delimiter {}, continue, do … while( … ), for( … ) …, for( … in … ) …, goto, Reserved Word, while( … ) … Cross-references: ECMA 262 edition 3 section 12.12 Label object (Object/HTML) Adds a legend label to an input object. Availability: DOM level 1 JavaScript 1.5 JScript 3.0 Internet Explorer 4.0 Netscape 6.0 Inherits from: Element object IE myLabel = myDocument.all.anElementID IE myLabel = myDocument.all.tags(”LABEL”)[anIndex] IE myLabel = myDocument.all[aName] -myLabel = myDocument.getElementById(anElementID) -myLabel = myDocument.getElementsByName(aName)[anIndex] JavaScript syntax: -myLabel = myDocument.getElementsByTagName(”LABEL”) [anIndex] HTML syntax: … anIndex A reference to an element in a collection aName An associative array reference Argument list: anElementID The ID value of an Element object Object properties: accessKey, dataFld, dataFormatAs, dataSrc, form, htmlFor, tabIndex Object methods: blur(), click() Event handlers: MSIE supports this object type with a LABELobject, and because we often don’t need to know the specific class of an object, this does not cause us any significant problems with labels. But the inconsistent object class names across browsers may need to be standardized in a more reliable way in the future. onBlur, onClick, onDblClick, onDragStart, onFilterChange, onFocus, onHelp, onKeyDown, onKeyPress, onKeyUp, onMouseDown, onMouseMove, onMouseOut, onMouseOver, onMouseUp, onSelectStart See also: Element object, Input object, Input.accessKey 1281
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Label (Definition) An identifier marking a section of code. Availability: ECMAScript edition 3 In JavaScript version 1.2, the case and default labels were added, which introduced as a by- product the fact that any fragment of code can be labelled with an identifier. The identifier can be any legal JavaScript identifier that does not match a reserved keyword. The namespace that labels exist in, is separate to that of variables and function names. This means you can use the same identifier names over again, although it s probably good practice not to. Adding a label in front of an iterator allows you to associate a label name with a break or continue statement. This means that you can break or continue nested iterators from deep inside them. This can greatly simplify the logic of a looping system. If the goto keyword is ever implemented, it would depend on this labelling mechanism being extended to provide a useful destination. Example code: // An example break to a labelled line outerLoop: for (var i=0; i <= max; i++) { for (var j=0; j <= max2; j++) { if (i== someNum && j ==someNum2) { break outerLoop; } } }
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Error! No text of specified style in document. The JavaScript 2.0 project defines these which should also be avoided and which will likely be added to a later edition of the ECMAScript standard: . namespace . use Many implementations of JavaScript will introduce additional keywords. Some will provide functional behavior for the reserved keywords. To remain ECMAScript compliant, the reserved words specified in edition 3 must be supported sufficiently to prevent parsing errors, but need not provide any meaningful functionality. You can code defensively to avoid any future problems. Using an underscore character or digit in your identifier names should improve the chances of your script continuing to operate properly in later versions of the language. Using upper case may help, but is less of a guarantee of safety. In particular, you should be very careful to avoid the names of properties and methods belonging to the Global object. See also: Lexical element, Reserved word, Token Cross-references: ECMA 262 edition 2 section 7.4.2 ECMA 262 edition 3 section 7.5.2 1279
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Chapter number The remaining reserved keywords as of edition 3 are: . abstract . boolean . byte . char . class . const . debugger . double . enum . export . extends . final . float . goto . implements . import . int . interface . long . native . package . private . protected . public . short . static . super . synchronized . throws . transient . volatile However, you should note that Netscape anticipates a future standard and supports these already: . export . import 1278
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Error! No text of specified style in document. Here is a list of keywords that ECMA edition 2 mandates a compliant implementation should support: . break . continue . delete . else . for . function . if . in . new . return . this . typeof . var . void . while . with In addition, these are constants that should also be avoided: . true . false . null The third edition of the ECMA standard adds these keywords which in the earlier edition were reserved for future use: . case . catch . default . do . finally . instanceof . switch . throw . try 1277
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Chapter number Example code: See also: captureEvents(), Event, Event names, Event type constants, Event.modifiers, Event.which, onKeyDown, onKeyPress, onKeyUp, String.fromCharCode() Keyword (Definition) The keywords that ECMAScript defines should be avoided when you create your own identifier or variable names. A keyword is a word that has special significance in the JavaScript language. It follows the rules that ECMA lays down for describing identifiers. All of the JavaScript keywords are reserved and define the language syntax. You must not use any of them as identifier names for variables, properties, methods and functions that you define. ECMAScript reserves a set of keywords for future use. These are intended to make provision for future language features and to give developers warning that they should avoid using these keywords in order that their scripts should continue to operate when the language is revised. Other special names are defined by JavaScript to identify properties of the Global object and constructor functions of the built-in data types. You should avoid these too, unless you are intentionally overriding their functionality with your own. 1276
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Error! No text of specified style in document. Event name JavaScript JScript N IE Opera DOM HTML Notes onClick 1.5 + 1.0 + 6.0 + 4.0 + 3.0 + 4.0 + Warning onDblClick 1.5 + 3.0 + 6.0 + 4.0 + 3.0 + 4.0 + Warning onDragStart 3.0 + 4.0 + - onFilterChange 3.0 + 4.0 + - onHelp 3.0 + 4.0 + Warning onKeyDown 1.5 + 3.0 + 6.0 + 4.0 + 3.0 + 4.0 + Warning onKeyPress 1.5 + 3.0 + 6.0 + 4.0 + 3.0 + 4.0 + Warning onKeyUp 1.5 + 3.0 + 6.0 + 4.0 + 3.0 + 4.0 + Warning onMouseDown 1.5 + 3.0 + 6.0 + 4.0 + 3.0 + 4.0 + Warning onMouseMove 1.5 + 3.0 + 6.0 + 4.0 + 4.0 + Warning onMouseOut 1.5 + 3.0 + 6.0 + 4.0 + 3.0 + 4.0 + Warning onMouseOver 1.5 + 1.0 + 6.0 + 4.0 + 3.0 + 4.0 + Warning onMouseUp 1.5 + 3.0 + 6.0 + 4.0 + 3.0 + 4.0 + Warning onSelectStart 3.0 + 4.0 + - Inheritance chain: Element object, Node object Keyboard events (Definition) Some events within the event-handling complex of a browser are related to keyboard handling. The following events relate to keyboard handling: . onKeyDown . onKeyUp . onKeyPress These events are classified as keyboard events because they are generated as a result of user interactions with the keyboard. Note that the onKeyPressevent is triggered as a result of a matching pair of onKeyDown and onKeyUp events. You should not rely on the events arriving in any particular order, although onKeyPress probably arrives before onKeyUp. For example, as a key is pressed, an onKeyDown event is fired. As it is released, an onKeyUp event and an onKeyPress event are fired. An onKeyPress is only fired once for each onKeyDown and onKeyUp pair. In Netscape, you can capture keyboard events by calling the captureEvents() method like this: window.captureEvents(Event.KEYPRESS); This need not necessarily apply to the window; the area of interest can be more limited by selecting an appropriate object. 1275
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KBD object (Object/HTML) An object representing content to be displayed as if typed on the keyboard. Availability: DOM level 1 JavaScript 1.5 JScript 3.0 Internet Explorer 4.0 Netscape 6.0 Inherits from: Element object IE myKBD = myDocument.all.anElementID IE myKBD = myDocument.all.tags(”KBD”)[anIndex] IE myKBD = myDocument.all[aName] -myKBD = myDocument.getElementById(anElementID) -myKBD = myDocument.getElementsByName(aName)[anIndex] JavaScript syntax: -myKBD = myDocument.getElementsByTagName(”KBD”)[anIndex] HTML syntax: … anElementID The ID attribute of the element required anIndex A reference to an element in a collection Argument list: aName An associative array reference Event handlers: onClick, onDblClick, onDragStart, onFilterChange, onHelp, onKeyDown, onKeyPress, onKeyUp, onMouseDown, onMouseMove, onMouseOut, onMouseOver, onMouseUp, onSelectStart The appearance of the content described by this object is likely to look similar to that enclosed in ,

 tags.   See also:  Element object, LISTING object, PRE object    
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