Looping through objects with variables and strings [Help Please]

andrewbriscoe87 · #1 (**permalink**) Mar 24th, 2007, 12:40

Hello everyone,
Sorry I haven’t made a proper introduction to the site yet but I need some assistance. I'm working on fixing some of my old and fairly dodgy coding, and I would greatly appreciate if someone could tell me how to loop through objects

For example

var appletName = new Array(3)
appletName[0] = applet1
appletName[1] = applet2
appletName[2] = applet3

Now if I want to make automate it's self using strings and variables,
var a=1
var b=a-1
appletName[b] = “applet” + a

… and looped it so that a and b increment by 1 each time

Would this work? Because I have found in my previous codes that when ever I attempt at making an object from adding a variable and a string together... it does not work, though this could be due to the fact I didn’t debug, any suggestions?

Here is what I mean (There may be a few other errors, as this is hypothetical code, not the actual code, but basically it is)

... <body onLoad="name()" ...

... <script>
function name(){
if (appletName[b] != 0){
appletName[b] = "applet" + a
objectIWantToChange = appletName[b]
objectIWantToChange.style.left = 300 * b
b++
a++

}
}
}
</script> ...
If someone knows a more effective way of achieving this, can somebody please post a reply.

spinal007 · #2 (**permalink**) Mar 24th, 2007, 16:14

Your problem is here:

objectIWantToChange = appletName[b]
objectIWantToChange.style.left = 300 * b

objectIWantToChange is null, not the object you want to change.
To get the object you want to change, use:

objectIWantToChange=document.getElementById(appletName[b]);
objectIWantToChange.style.left = 300 * b

in which case objectIWantToChange will hold the actual DOM object you want to access.

As for a better way to do this...
Your code suggests the object IDs are appletn where n is a number 1,2,3, etc...
I'd suggest doing this:
... <body onLoad="name()" ...
<script>
function name(){
for(var i=99;i>0;i--){
document.getElementById("applet" + i).style.left = 300 * i;
}
}
// where 99 is the number of objects...
</script> ...

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Looping through objects with variables and strings [Help Please]