getIndex function

[duponty]

Hi,
I am looking for a function that would give me the index of a specified object in a array.

eg:

toto = new array()
toto["object1"] = image.gif

I want the index of "object1"

thanks

 

[GIGN]

This function takes the member who's index you want, and the array it belongs to. If -1 is returned, then there is no matching element. Also, it will match integers. You could probably extend it to match anything actually - even objects?


function getIndex(member,array){
var index = -1;
for(var j=0;j<array.length;j++){
if(array[j] == member){
index = j;
break;
}
}
return index;
}


e.g. for the array:

var people = new Array(&quot;Ben&quot;,&quot;Gus&quot;,&quot;Tim&quot;,4,&quot;Coopth&quot;

the call: getIndex(&quot;Tim&quot;,people) returns 2
and getIndex(4,people) returns 3

Hope this works for you.
b² - benbiddington@surf4nix.com

 

[luciddream]

there's a problem in what you're trying to do... once you use an associative array, you can't use it ordinally again..

so, you could use bangers suggestion if you had something like:

var x = new Array();
x[0] = &quot;image.gif&quot;;

but, using your example

var x = new Array();
x[&quot;bob&quot;] = &quot;image.gif&quot;;

you won't be able to access that with an index other than &quot;bob&quot;

you could get that by using a for in loop however.

function getIndex(m, a)
{
for(var i in a)
{
if(a == m)
{
return i;
}
}
return -1;
}

this should work for associative and ordinal arrays...

although it would be nicer to prototype it to the Array Object.

Array.prototype.indexOf = function(m)
{
for(var i in a)
{
if(this == m)
{
return i;
}
}
return -1;
}

so now you can call it like so:

var x = new Array();
x[&quot;bob&quot;] = &quot;image.gif&quot;;
var y = x.indexOf(&quot;image.gif&quot; luciddream@subdimension.com

 

[luciddream]

make that:
function getIndex(m, a)
{
for(var i in a)
{
if(a == m)
{
return i;
}
}
return -1;
}


and:

Array.prototype.indexOf = function(m)
{
for(var i in a)
{
if(this == m)
{
return i;
}
}
return -1;
}
luciddream@subdimension.com