Javascript variable as method

[LukeK1980@gmail.com]

is this possible to do or am I dreaming

function getsomething(){
document.write( stuffToGet("myT able","tr","id" ))

}

function stuffToGet(elem Id,elemArray,va lueToGet){
var n, elem =
document.getEle mentById(elemId ).getElementsBy TagName(elemArr ay)
var Nelem = elem.length;
var rS
for (n=0;n<Nelem,n+ +){
rS= rS + elem[n].valueToGet;
}
return(rS)
}

I want to pass the method in a variable but it doesn't seem to work
for me keep getting and undefined value.
I get the array fine it is only the method that doesn't seem to work

Please help thanks

[RobG]

Re: Javascript variable as method

On Jun 12, 6:35 am, LukeK1...@gmail .com wrote:

is this possible to do or am I dreaming
>
function getsomething(){
document.write( stuffToGet("myT able","tr","id" ))
>
}
>
function stuffToGet(elem Id,elemArray,va lueToGet){
  var n, elem =
document.getEle mentById(elemId ).getElementsBy TagName(elemArr ay)
  var Nelem = elem.length;
var rS

Initialise rS as a string:

var rS = '';

  for (n=0;n<Nelem,n+ +){
        rS= rS + elem[n].valueToGet;

Now concatenation will work. You also want valueToGet to be evaluated,
so use square bracket notation:

rS= rS + elem[n][valueToGet];


Also consider making rS an array:

var rS = [];

Then inside the loop:

rS.push(elem[n][valueToGet]);

and lastly:

return rS.join(', ');

>
}
       return(rS)

Return is not a function, there is no need to wrap the return
expression in brackets.


--
Rob

[Dan Rumney]

Re: Javascript variable as method

LukeK1980@gmail .com wrote:
[snip]

function stuffToGet(elem Id,elemArray,va lueToGet){
var n, elem =
document.getEle mentById(elemId ).getElementsBy TagName(elemArr ay)
var Nelem = elem.length;
var rS
for (n=0;n<Nelem,n+ +){
rS= rS + elem[n].valueToGet;
}
return(rS)
}

Javascript will interpret this as you requesting a property call
valueToGet from the object elem[n]

What you need to use is

rS = rS + elem[n][valueToGet];

[=?ISO-8859-1?Q?=22=C1lvaro_G=2E_Vicario=22?=]

Re: Javascript variable as method

abcLukeK1980@gm ail.com escribió:

function getsomething(){
document.write( stuffToGet("myT able","tr","id" ))
>
}
>
function stuffToGet(elem Id,elemArray,va lueToGet){
var n, elem =
document.getEle mentById(elemId ).getElementsBy TagName(elemArr ay)
var Nelem = elem.length;
var rS
for (n=0;n<Nelem,n+ +){
rS= rS + elem[n].valueToGet;
}
return(rS)
}

I haven't dived into your code but combining document.write( ) with
document.getEle mentById() has the drawback that write() can only be used
before the document is finished and getElementById( ) can only be used
when the element with such ID is ready. You must be careful with that.


--
-- http://alvaro.es - Álvaro G. Vicario - Burgos, Spain
-- Mi sitio sobre programación web: http://bits.demogracia.com
-- Mi web de humor al baño María: http://www.demogracia.com
--

[Thomas 'PointedEars' Lahn]

Re: Javascript variable as method

Dan Rumney wrote:

LukeK1980@gmail .com wrote:
[snip]

> for (n=0;n<Nelem,n+ +){
> rS= rS + elem[n].valueToGet;
>[...]

>
Javascript will interpret this as you requesting a property call
valueToGet from the object elem[n]

property _lookup_. Callable objects like Function objects are called instead.

What you need to use is
>
rS = rS + elem[n][valueToGet];

ACK, or something a little bit more efficient.


PointedEars
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