This script allows you to get the object name literal as string.
It works as long as caller property is supported and as long as a call
chain is presented (thus one could backtrace to the holder of the
literal).
A need of such script is more than questionnable. I guess these
literals just got me of being too dazzling: you see them, you can touch
them, but you cannot get their damn name despite it's just in front of
you. :-)
<html>
<head>
<title>Object name</title>
<meta http-equiv="Content-Type" content="text/html;
charset=iso-8859-1">
<script>
var foo = new Object();
var bar = foo;
function test(obj) {
alert(getObject Name(obj));
}
function getObjectName(o bj) {
var thisCaller = getObjectName.c aller;
// Go through the call chain to find
// the true name holder:
while ((thisCaller)&& (thisCaller.cal ler)) {
thisCaller = thisCaller.call er;
}
if (thisCaller) {
var re = /(\(\s*)(.+)(\s* \))/;
var f = thisCaller.toSt ring();
re.exec(f);
return RegExp.$2;
}
else {
// caller property is not supported
// or the call chain is broken
return 'undefined';
}
}
</script>
</head>
<body bgcolor="#FFFFF F" onload="test(fo o)">
</body>
</html>
3  2556 
>A need of such script is more than questionnable
It is useful if you want to serialise your data.
Assuming I create some constructor object for a particular kind of
data:-
function myData()
{
}
If I want to serialise this properly, I also need to know the name of
the constructor (myData), so that when I unserialise I know which
constructor to call.
A serialised form could be
[
[
"myData",
{
"property":"val ue"
"property":"val ue"
"property":"val ue"
}
],
[
"myData",
{
"property":"val ue"
"property":"val ue"
"property":"val ue"
}
]
]
When unserialising I can then use:-
var oInstance=new window[sConstructor]();
oInstance.prope rty=value;
etc
Baconbutty wrote: A need of such script is more than questionnable
It is useful if you want to serialise your data.
Assuming I create some constructor object for a particular kind of
data:-
function myData()
{
}
Consider adding:
myData.prototyp e = {
property1: value1,
property2: value2,
constructor: myData
}
If I want to serialise this properly, I also need to know the name of
the constructor (myData), so that when I unserialise I know which
constructor to call.
A serialised form could be
[
{
property1: value1,
property2: value2,
constructor: myData
}
]
[snip]
When unserialising I can then use:-
var oInstance=new window[sConstructor]();
oInstance.prope rty=value;
etc
or:
// assuming you've parsed it into an actual var oData
var oInstance = new oData[0].constructor( oData[0] );
Write your constructors to accept objects that are based on what
they're constructing, using the properties of the passed object to
override defaults in the prototype/constructor.
Of course, doing it this way means you're also serializing actual code,
the benefits, drawbacks, and adviseability of which will vary.
Just something to think about.
Thank you Christohper.
They are some interesting points to consider.
I will experiment with them.
I have been looking at different ways of serialising data, simply
because my only coding skills are in Javascript, so as well as for web
pages, I use DHTML to write on-the-fly mini browser-applications for
use in my work (e.g. I have written a small personal time recording
application) which require data to be serialised.
Thanks again.
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