JS_DefaultValue
this article covers features introduced in spidermonkey 1.8.6 converts a javascript object to a primitive value, using the semantics of that object's internal [[defaultvalue]] hook.
... syntax bool js_defaultvalue(jscontext *cx, js::handle<jsobject*> obj, jstype hint, js::mutablehandle<js::value> vp); name type description cx jscontext * the context in which to perform the conversion.
... hint jstype the hint to pass to the [[defaultvalue]] hook when converting the object.
...And 5 more matches

JSObjectOps.defaultValue
the javascript engine calls the jsobjectops.defaultvalue and jsclass.convert callbacks to convert objects to primitive values.
... description the jsobjectops.defaultvalue callback corresponds to the [[defaultvalue]] method defined in ecma 262-3 §8.6.2.6.
... many expressions in the ecmascript language, such as a+b, involve implicit conversion of the operands using [[defaultvalue]].
...And 3 more matches

AudioParam.defaultValue - Web APIs
the defaultvalue read-only property of the audioparam interface represents the initial value of the attributes as defined by the specific audionode creating the audioparam.
... syntax var defaultval = audioparam.defaultvalue; value a floating-point number.
... example const audioctx = new audiocontext(); const gainnode = audioctx.creategain(); const defaultval = gainnode.gain.defaultvalue; console.log(defaultval); // 1 console.log(defaultval === gainnode.gain.value); // true specifications specification status comment web audio apithe definition of 'defaultvalue' in that specification.

defaultValue - Archive of obsolete content
« xul reference defaultvalue type: string gets and sets the the default value in a textbox.

Component; nsIPrefBranch
method overview void addobserver(in string adomain, in nsiobserver aobserver, in boolean aholdweak); void clearuserpref(in string aprefname); void deletebranch(in string astartingat); boolean getboolpref(in string aprefname, requires gecko 54 [optional] in boolean adefaultvalue); string getcharpref(in string aprefname,requires gecko 54 [optional] in string adefaultvalue); requires gecko 58 utf8tring getstringpref(in string aprefname, [optional] in utf8string adefaultvalue); void getchildlist(in string astartingat, [optional] out unsigned long acount, [array, size_is(acount), retval] out string achildarray); void getcomplexvalue(in str...
...ing aprefname, in nsiidref atype, [iid_is(atype), retval] out nsqiresult avalue); long getintpref(in string aprefname,requires gecko 54 [optional] in long adefaultvalue); long getpreftype(in string aprefname); void lockpref(in string aprefname); boolean prefhasuservalue(in string aprefname); boolean prefislocked(in string aprefname); void removeobserver(in string adomain, in nsiobserver aobserver); void resetbranch(in string astartingat); void setboolpref(in string aprefname, in long avalue); void setcharpref(in string aprefname, in string avalue); requires gecko 58 void setstringpref(in string aprefname, in utf8string avalue); void setcomplexvalue(in string aprefname, in nsiidref atype, in nsisupports ...
... boolean getboolpref( in string aprefname, [optional] in boolean adefaultvalue ); parameters aprefname the boolean preference to get the state of.
...And 7 more matches

preferences/service - Archive of obsolete content
example: var name = "extensions.checkcompatibility.nightly"; require("sdk/preferences/service").set(name, false); get(name, defaultvalue) gets the application preference name.
... parameters name : string defaultvalue : string,number,boolean preference value.
... returns string,number,boolean : preference value, returns defaultvalue if no preference is set, returns undefined if defaultvalue is not provided.
...And 3 more matches

Index
94 jsconvertop jsapi reference, reference, référence(2), spidermonkey jsconvertop callback specifies conversion behavior for objects having this class, implementing the ecmascript [[defaultvalue]] behavior for them.
... 128 jsobject jsapi reference, spidermonkey objects are made up of the following parts: 129 jsobjectop jsapi reference, obsolete, spidermonkey the callbacks of this type are: 130 jsobjectops.defaultvalue jsapi reference, obsolete, spidermonkey the jsobjectops.defaultvalue callback corresponds to the [[defaultvalue]] method defined in ecma 262-3 §8.6.2.6.
... many expressions in the ecmascript language, such as a+b, involve implicit conversion of the operands using [[defaultvalue]].
... 227 js_defaultvalue jsapi reference, spidermonkey renamed to js::toprimitive from jsapi 44.

nsIDBFolderInfo
?????????"] .createinstance(components.interfaces.nsidbfolderinfo); method overview long andflags(in long flags); void changeexpungedbytes(in long delta); void changenummessages(in long delta); void changenumunreadmessages(in long delta); boolean getbooleanproperty(in string propertyname, in boolean defaultvalue); void getcharacterset(out acstring charset, out boolean overriden); void getcharactersetoverride(out boolean charactersetoverride); obsolete since gecko 1.8 string getcharptrcharacterset(); string getcharptrproperty(in string propertyname); void getlocale(in nsstring result); native code only!
...obsolete since gecko 1.8 astring getproperty(in string propertyname); nsidbfolderinfo gettransferinfo(); unsigned long getuint32property(in string propertyname, in unsigned long defaultvalue); void initfromtransferinfo(in nsidbfolderinfo transferinfo); long orflags(in long flags); void setbooleanproperty(in string propertyname, in boolean apropertyvalue); void setcharacterset(in string charset); void setcharactersetoverride(in boolean charactersetoverride); obsolete since gecko 1.8 void setcharptrproperty(in string apropertyname, in string apropertyvalue); ...
... delta missing description exceptions thrown missing exception missing description changenumunreadmessages() void changenumunreadmessages( in long delta ); parameters delta missing description exceptions thrown missing exception missing description getbooleanproperty() boolean getbooleanproperty( in string propertyname, in boolean defaultvalue ); parameters propertyname missing description defaultvalue missing description return value missing description exceptions thrown missing exception missing description getcharacterset() void getcharacterset( out acstring charset, out boolean overriden ); parameters charset missing description overriden missing descr...
...return value missing description exceptions thrown missing exception missing description getuint32property() unsigned long getuint32property( in string propertyname, in unsigned long defaultvalue ); parameters propertyname missing description defaultvalue missing description return value missing description exceptions thrown missing exception missing description initfromtransferinfo() void initfromtransferinfo( in nsidbfolderinfo transferinfo ); parameters transferinfo missing description exceptions thrown missing e...

HTMLOutputElement - Web APIs
htmloutputelement.defaultvalue a domstring representing the default value of the element, initially the empty string.
... if the element is in default mode when the descendants of the element are changed in any way, the defaultvalue property is set to the value of the textcontent property.
... resetting the form puts the element into default mode, and sets the textcontent property to the value of the defaultvalue property.
...when the element is in value mode, the default value is accessible only through the defaultvalue property.

preference - Archive of obsolete content
attributes disabled, instantapply, inverted, name, onchange, readonly, tabindex, type properties defaultvalue, disabled, hasuservalue, inverted, locked, name, preferences, readonly, tabindex, type, value, valuefrompreferences methods reset examples <preferences> <preference id="pref_id" name="preference.name" type="int"/> </preferences> see preferences system for a complete example.
... properties defaultvalue (readonly) returns the default value of the preference.
...in this case the actual value to be displayed in the ui is obtained from the defaultvalue property.

JSConvertOp
hint jstype the hint to pass to the [[defaultvalue]] hook when converting the object.
... description jsconvertop callback specifies conversion behavior for objects having this class, implementing the ecmascript [[defaultvalue]] behavior for them.
... jsclass hooks jsclass offers the following hook: the jsclass.convert callback implements the [[defaultvalue]] behavior for objects having that class.

nsIAbCard/Thunderbird3
birthyear, birthmonth, birthday webpage1 (work), webpage2 (home) custom1, custom2, custom3, custom4 notes integral properties: lastmodifieddate popularityindex prefermailformat (see nsiabprefermailformat) boolean properties: allowremotecontent inherits from: nsiabitem method overview nsivariant getproperty(in autf8string name, in nsivariant defaultvalue); [noscript] astring getpropertyasastring(in string name); [noscript] autf8string getpropertyasautf8string(in string name); [noscript] pruint32 getpropertyasuint32(in string name); [noscript] boolean getpropertyasbool(in string name); void setproperty(in autf8string name, in nsivariant value); [noscript] void setpropertyasastring(in string nam...
... nsivariant getproperty(in autf8string name, in nsivariant defaultvalue); parameters name the case-sensitive name of the property to get.
... defaultvalue the value to return if the property does not exist.

textbox - Archive of obsolete content
attributes cols, decimalplaces, disabled, emptytext, hidespinbuttons, increment, label, max, maxlength, min, multiline, newlines, onblur, onchange, onfocus, oninput, placeholder, preference, readonly, rows, searchbutton, size, spellcheck, tabindex, timeout, type, value, wrap, wraparound properties accessibletype, clickselectsall, decimalplaces, decimalsymbol, defaultvalue, disabled, editor, emptytext, increment, inputfield, label, max, maxlength, min, placeholder, readonly, searchbutton, selectionend, selectionstart, size, spinbuttons, tabindex, textlength, timeout, type, value, valuenumber, wraparound methods decrease, increase, reset, select, setselectionrange style classes plain examples <vbox> <label control="your-name" value="enter your name:"/...
...the default value is a period (.) defaultvalue type: string gets and sets the the default value in a textbox.

JSAPI reference
js_setprototype js_getprivate js_setprivate js_freezeobject added in spidermonkey 1.8.5 js_deepfreezeobject added in spidermonkey 1.8.5 js_isextensible added in spidermonkey 1.8.5 js_preventextensions added in spidermonkey 45 js_instanceof js_hasinstance js_isnative added in spidermonkey 17 js::toprimitiveadded in spidermonkey 45 js::newfunctionfromspecadded in spidermonkey 45 js_defaultvalueobsolete since jsapi 44 js_get_class obsolete since jsapi 13 js_sealobject obsolete since javascript 1.8.5 js_getparent obsolete since jsapi 39 js_setparent obsolete since jsapi 39 standard objects enum jsprotokey added in spidermonkey 24 js_getclassobject js_getclassprototype js::protokeytoid added in spidermonkey 38 js_idtoprotokey added in spidermonkey 31 js::identifystandardinsta...
... jsnewobjectmapop obsolete since javascript 1.8.5 jsobjectmapop obsolete since javascript 1.8.5 jslookuppropop obsolete since javascript 1.8.5 jsdefinepropop obsolete since javascript 1.8.5 jspropertyidop obsolete since javascript 1.8.5 jsattributesop obsolete since javascript 1.8.5 jsobjectops.defaultvalue obsolete since javascript 1.8.5 jscheckaccessidop obsolete since javascript 1.8.5 jsobjectop obsolete since javascript 1.8.5 jspropertyrefop obsolete since javascript 1.8.5 jssetobjectslotop obsolete since javascript 1.8.5 jsgetrequiredslotop obsolete since javascript 1.8.5 jssetrequiredslotop obsolete since javascript 1.8.5 jsxmlobjectops method types: in js 1.8.5, jsxmlobjectops has be...

extIPreferenceBranch
method overview boolean has(in astring aname) extipreference get(in astring aname) nsivariant getvalue(in astring aname, in nsivariant adefaultvalue) void setvalue(in astring aname, in nsivariant avalue) void reset() attributes attribute type description root readonly attribute astring the name of the branch root.
... nsivariant getvalue(in astring aname, in nsivariant adefaultvalue) parameters aname the name of a preference adefaultvalue the default value of a preference.