eval(string[, object]) example

[C.W.Holeman II]

I am looking for an example using the object argument to eval().

http://developer.mozilla.org/en/docs...Functions:eval

--
C.W.Holeman II | cw***@Julian5Locals.com-5 http://JulianLocals.com/cwhii
To only a fraction of the human race does God give the privilege of
earning one's bread doing what one would have gladly pursued free, for
passion. I am very thankful. The Mythical Man-Month Epilogue/F.P.Brooks

[Duncan Booth]

"C.W.Holeman II" <cw***************@yahoo.comwrote:

I am looking for an example using the object argument to eval().

eval("alert(x);", {x:42});

[Randy Webb]

C.W.Holeman II said the following on 4/26/2007 3:35 PM:

I am looking for an example using the object argument to eval().

Why? A better question is what are the scenarios where eval is needed
because an alternative isn't available (or a reasonable alternative).

--
Randy
Chance Favors The Prepared Mind
comp.lang.javascript FAQ - http://jibbering.com/faq/index.html
Javascript Best Practices - http://www.JavascriptToolbox.com/bestpractices/

[Dr J R Stockton]

In comp.lang.javascript message <13*************@corp.supernews.com>,
Thu, 26 Apr 2007 11:35:52, C.W.Holeman II <cw***************@yahoo.com>
posted:

>I am looking for an example using the object argument to eval().

<URL:http://www.merlyn.demon.co.uk/holidays.htmapplies eval to
DataBox.value - that's more than just an Object, but a major part of it
is an Object assignment, and I see nothing to prevent the code being
adjusted so that DataBox.value contained a single Object Literal, {...}.

Or did you want a simple example?

--
(c) John Stockton, Surrey, UK. ?@merlyn.demon.co.uk Turnpike v6.05 IE 6.
Web <URL:http://www.merlyn.demon.co.uk/- w. FAQish topics, links, acronyms
PAS EXE etc : <URL:http://www.merlyn.demon.co.uk/programs/- see 00index.htm
Dates - miscdate.htm moredate.htm js-dates.htm pas-time.htm critdate.htm etc.

[-Lost]

Randy Webb wrote:

C.W.Holeman II said the following on 4/26/2007 3:35 PM:

>I am looking for an example using the object argument to eval().

Why? A better question is what are the scenarios where eval is needed
because an alternative isn't available (or a reasonable alternative).

Dang it. I just ran across an article within the last day or so and now
cannot find it to save my life.

It was something about "this is a fairly advanced use of eval." For
some reason I thought it even mentioned "kung fu."

This would have been a perfect article in response to this thread.

Maybe someone else can find it?

--
-Lost
Remove the extra words to reply by e-mail. Don't e-mail me. I am
kidding. No I am not.

[C.W.Holeman II]

Duncan Booth wrote:

"C.W.Holeman II" <cw***************@yahoo.comwrote:

>I am looking for an example using the object argument to eval().

eval("alert(x);", {x:42});

Changed from the XSLT file generating an id which produced output like:

<emleo:constant
emle_id="EMLE_id0x588"
emle_on_load="emleNextOnChange(emleGetElementById( 'EMLE_id0x588'));"

>

to simply this fixed string:

<emleo:constant emle_on_load="emleNextOnChange(thisElement);">

The javascript changed from no object passed:

eval(emleOnChange);

to adding the context at run-time:

eval(
emleOnChange,
{thisElement:changeNodePathResult.singleNodeValue. ownerElement}
);

http://emle.sourceforge.net/emle0200...le_lab_009.xml
http://emle.sourceforge.net/emle0200...le_lab_009.xsl
http://emle.sourceforge.net/emle0200...mle_lab_009.js

--
C.W.Holeman II cw***@Julian5Locals.com -5 http://JulianLocals.com/cwhii
To only a fraction of the human race does God give the privilege of
earning one's bread doing what one would have gladly pursued free, for
passion. I am very thankful. The Mythical Man-Month Epilogue/F.P.Brooks

[-Lost]

-Lost wrote:

Randy Webb wrote:

>C.W.Holeman II said the following on 4/26/2007 3:35 PM:

>>I am looking for an example using the object argument to eval().

Why? A better question is what are the scenarios where eval is needed
because an alternative isn't available (or a reasonable alternative).

Dang it. I just ran across an article within the last day or so and now
cannot find it to save my life.

It was something about "this is a fairly advanced use of eval." For
some reason I thought it even mentioned "kung fu."

This would have been a perfect article in response to this thread.

Maybe someone else can find it?

The only reason I found this is because I posted here, I am sure it is a
conspiracy.

Anyway...

http://www.berniecode.com/blog/2007/...in-javascript/

Which he then discusses in depth here:

http://www.berniecode.com/writing/eval.html

I make no claims about its validity or worthwhileness.

--
-Lost
Remove the extra words to reply by e-mail. Don't e-mail me. I am
kidding. No I am not.

[C.W.Holeman II]

C.W.Holeman II wrote:

Duncan Booth wrote:

>"C.W.Holeman II" <cw***************@yahoo.comwrote:

>>I am looking for an example using the object argument to eval().

eval("alert(x);", {x:42});

Changed from the XSLT file generating an id which produced output like:

<emleo:constant
emle_id="EMLE_id0x588"
emle_on_load="emleNextOnChange(emleGetElementById( 'EMLE_id0x588'));"

>

to simply this fixed string:

<emleo:constant emle_on_load="emleNextOnChange(thisElement);">

The javascript changed from no object passed:

eval(emleOnChange);

to adding the context at run-time:

eval(
emleOnChange,
{thisElement:changeNodePathResult.singleNodeValue. ownerElement}
);

http://emle.sourceforge.net/emle0200...le_lab_009.xml
http://emle.sourceforge.net/emle0200...le_lab_009.xsl
http://emle.sourceforge.net/emle0200...mle_lab_009.js

Using:

Mozilla/5.0 (Windows; U; Windows NT 5.1; en-US; rv:1.8.1.3)
Gecko/20070309 Firefox/2.0.0.3

--
C.W.Holeman II cw***@Julian5Locals.com-5 http://JulianLocals.com/cwhii
To only a fraction of the human race does God give the privilege of
earning one's bread doing what one would have gladly pursued free, for
passion. I am very thankful. The Mythical Man-Month Epilogue/F.P.Brooks

[C.W.Holeman II]

Randy Webb wrote:

C.W.Holeman II said the following on 4/26/2007 3:35 PM:

>I am looking for an example using the object argument to eval().

Why? A better question is what are the scenarios where eval is needed
because an alternative isn't available (or a reasonable alternative).

Until now I have used a generated id to identify the element for a fake
callback attribute. Since an HTML onchange attribute is able to pass
'this'. I saw the eval() object argument as possibly addressing this
issue. What I have changed it to is:

<emleo:constant emle_on_load="emleNextOnChange(thisElement);">

which removes the need of the XSLT file from having to generate the id
and passing it to the callback. But, this has the javascript code:

eval(
emleOnChange,
{thisElement:changeNodePathResult.singleNodeValue. ownerElement}
);

needing to know the name 'thisElement' which is used in the XSLT file.

http://emle.sourceforge.net/emle0200...le_lab_009.xml
http://emle.sourceforge.net/emle0200...le_lab_009.xsl
http://emle.sourceforge.net/emle0200...mle_lab_009.js

So, is this better?

Is there a way to hand the context over to the callback without having
'thisElement' hard coded in the XSLT file?

--
C.W.Holeman II cw***@Julian5Locals.com -5 http://JulianLocals.com/cwhii
To only a fraction of the human race does God give the privilege of
earning one's bread doing what one would have gladly pursued free, for
passion. I am very thankful. The Mythical Man-Month Epilogue/F.P.Brooks

[Peter Michaux]

On Apr 26, 1:11 pm, Duncan Booth <[e-mail]:

"C.W.Holeman II" <[e-mail]:

I am looking for an example using the object argument to eval().

eval("alert(x);", {x:42});

eval() doesn't take a second argument in JavaScript. I know it does in
Ruby and it would be nice in JavaScript. Either way there are not many
more than three places were eval() is considered acceptably used in
JavaScript and that is where the code to be evaluated arrives to the
JavaScript as a sting.

Peter

[Duncan Booth]

Dr J R Stockton <jr*@merlyn.demon.co.ukwrote:

In comp.lang.javascript message <13*************@corp.supernews.com>,
Thu, 26 Apr 2007 11:35:52, C.W.Holeman II <cw***************@yahoo.com>
posted:

>>I am looking for an example using the object argument to eval().

<URL:http://www.merlyn.demon.co.uk/holidays.htmapplies eval to
DataBox.value - that's more than just an Object, but a major part of it
is an Object assignment, and I see nothing to prevent the code being
adjusted so that DataBox.value contained a single Object Literal, {...}.

Or did you want a simple example?

He was asking about the non-standard optional second argument to eval which
is supported by Mozilla/Firefox browsers. At least given the reference he
quoted I think that was what he was asking about.

[Randy Webb]

Peter Michaux said the following on 4/26/2007 10:56 PM:

On Apr 26, 1:11 pm, Duncan Booth <[e-mail]:

>"C.W.Holeman II" <[e-mail]:

>>I am looking for an example using the object argument to eval().

eval("alert(x);", {x:42});

eval() doesn't take a second argument in JavaScript.

Sure it does. JScript doesn't but Javascript - in Mozilla based browsers
- can accept it.

--
Randy
Chance Favors The Prepared Mind
comp.lang.javascript FAQ - http://jibbering.com/faq/index.html
Javascript Best Practices - http://www.JavascriptToolbox.com/bestpractices/