Question: probably basic one

[sheldonlg]

Simple overview:
I want to call a function in a javascript duntion where the name of the
called function is an argument value passed into the javascript function.

Here is what I want:

On the html pages:
page1: onclick="A('a', 'C')"

In the library:
function A(x, B) { y=...do stuff...; B(y);}

function C(x) {...}


Currently, I have A call a function D which has a switch statement to
call the proper C function. How can I have A call C directly using the
passed in name of C?

[Martin Honnen]

Re: Question: probably basic one

sheldonlg wrote:

Simple overview:
I want to call a function in a javascript duntion where the name of the
called function is an argument value passed into the javascript function.
>
Here is what I want:
>
On the html pages:
page1: onclick="A('a', 'C')"
>
In the library:
function A(x, B) { y=...do stuff...; B(y);}
>
function C(x) {...}
>
>
Currently, I have A call a function D which has a switch statement to
call the proper C function. How can I have A call C directly using the
passed in name of C?

Functions are first class objects so don't pass a function name in, pass
the function itself in e.g.
<div onclick="A('a', C);">
then you can simply use
function A(x, F) { y = ...; F(y); }

--

Martin Honnen

http://JavaScript.FAQTs.com/

[sheldonlg]

Re: Question: probably basic one

Martin Honnen wrote:

sheldonlg wrote:

>Simple overview:
>I want to call a function in a javascript duntion where the name of
>the called function is an argument value passed into the javascript
>function.
>>
>Here is what I want:
>>
>On the html pages:
>page1: onclick="A('a', 'C')"
>>
>In the library:
>function A(x, B) { y=...do stuff...; B(y);}
>>
>function C(x) {...}
>>
>>
>Currently, I have A call a function D which has a switch statement to
>call the proper C function. How can I have A call C directly using
>the passed in name of C?

>
Functions are first class objects so don't pass a function name in, pass
the function itself in e.g.
<div onclick="A('a', C);">
then you can simply use
function A(x, F) { y = ...; F(y); }
>

You mean simply leave off the quotes in the initial call is all I have
to do?

[Martin Honnen]

Re: Question: probably basic one

sheldonlg wrote:

You mean simply leave off the quotes in the initial call is all I have
to do?

Yes, you can do that to pass the function as an argument to the other
function.


--

Martin Honnen

http://JavaScript.FAQTs.com/

[Dr J R Stockton]

Re: Question: probably basic one

In comp.lang.javas cript message <48b572c9$0$129 53$9b4e6d93@new sspool2.ar
cor-online.net>, Wed, 27 Aug 2008 17:29:13, Martin Honnen
<mahotrash@yaho o.deposted:

>sheldonlg wrote:
>

>You mean simply leave off the quotes in the initial call is all I
>>have to do?

>
>Yes, you can do that to pass the function as an argument to the other
>function.

For those who really do want to pass in the name of the function as a
string (as originally asked), the notation shown by

window["LZ"](5)

is available; for me, that returns '05'. No doubt someone will comment
if that method is not always available.

If the function is frequently needed, consider :

Fn = window["LZ"]
Fn(5) + Fn(6) // gives '0506'

If, having received a function itself, one wants the name. one can
generally get it by a RegExp match on Fn.toString() ; js-nclds.htm .

It's a good idea to read the newsgroup c.l.j and its FAQ. See below.

--
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news:comp.lang. javascript FAQ <URL:http://www.jibbering.c om/faq/index.html>.
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<URL:http://www.merlyn.demo n.co.uk/TP/BP/Delphi/jscr/&c, FAQ items, links.

[sheldonlg]

Re: Question: probably basic one

Dr J R Stockton wrote:

In comp.lang.javas cript message <48b572c9$0$129 53$9b4e6d93@new sspool2.ar
cor-online.net>, Wed, 27 Aug 2008 17:29:13, Martin Honnen
<mahotrash@yaho o.deposted:

>sheldonlg wrote:
>>

>>You mean simply leave off the quotes in the initial call is all I
>>have to do?

>Yes, you can do that to pass the function as an argument to the other
>function.

>
For those who really do want to pass in the name of the function as a
string (as originally asked), the notation shown by
>
window["LZ"](5)
>
is available; for me, that returns '05'. No doubt someone will comment
if that method is not always available.
>
If the function is frequently needed, consider :
>
Fn = window["LZ"]
Fn(5) + Fn(6) // gives '0506'
>
If, having received a function itself, one wants the name. one can
generally get it by a RegExp match on Fn.toString() ; js-nclds.htm .
>
It's a good idea to read the newsgroup c.l.j and its FAQ. See below.
>

I only asked about the name because that is what I thought I had to do.
However, what I want is more like;

onclick="getVal ues(p1, p2, postGetValues)" ;

function getValues(x, y, z) {
....gets w...
otherFunction(w , z);
}

funtion otherFunction(a , z) {
....gets b....
z(b);
}

postGetValues(x ) {
...process x which gets its value from otherFunction.. .
}

As I understood mahotrash, this is what he meant and this is what I
wanted. The idea being that all I need write is the initially invoked
function (getValues) and the post-processing function (postGetValues) ,
eliminating the need for altering a third middle function which has a
switch statement to navigate properly.

[Evertjan.]

Re: Question: probably basic one

Dr J R Stockton wrote on 27 aug 2008 in comp.lang.javas cript:

For those who really do want to pass in the name of the function as a
string (as originally asked), the notation shown by
>
window["LZ"](5)
>

.... gives interesting be it not very useful possibilities
for batchwize assigning of functions:

<script type='text/javascript'>

var weekDay = 'x/Su/Mo/Tu/We/Th/Fr/Sa'.split('/');

for(var i=1;i<8;i++) {
window[weekDay[i]] = function(){retu rn 'It's raining again'};
};

alert (Th());

</script>

--
Evertjan.
The Netherlands.
(Please change the x'es to dots in my emailaddress)