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What is wrong with my javascript?

Hello Experts,

I am trying to dynamically create a variable as follows:

var value[] = 1;
value[] = 2;

var my[0] = 123;
var my[1] = 4;

if(eval("myArray_"+my[0]+"_"+my[1]) === undefined)
{
	eval("var myArray_"+my[0]+"_"+my[1]+ " = new Array();");
}
eval("myArray_"+my[0]+"_"+my[1]+"[] = " + value + ";" ); // eg myArray_123_4

Open in new window


I get an error on the following line:
if(eval("myArray_"+my[0]+"_"+my[1]) === undefined)

Error: 'myArray_123_4' is undefined

a) What am I doing wrong?
b) Once corrected, do I access this variable by:

var x = eval('myArray_123_4'); ?

Thanks!


0
jagku
Asked:
jagku
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4 Solutions
 
leakim971PluritechnicianCommented:
Same idea :


var value[] = 1;
value[] = 2;

var my[0] = 123;
var my[1] = 4;

try{
   eval("myArray_"+my[0]+"_"+my[1]);
}
catch(e) {
   eval("var myArray_"+my[0]+"_"+my[1]+ " = new Array();");
}
eval("myArray_"+my[0]+"_"+my[1]+"[] = " + value + ";" ); // eg myArray_123_4
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leakim971PluritechnicianCommented:
or perhaps :

var value[] = 1;
value[] = 2;

var my[0] = 123;
var my[1] = 4;

if(window["myArray_"+my[0]+"_"+my[1]] === undefined)
{
      window["myArray_"+my[0]+"_"+my[1]] = new Array();
}
window["myArray_"+my[0]+"_"+my[1]] = value; // eg myArray_123_4
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SilhouetteCommented:
You can use:

if(typeof("myArray_"+my[0]+"_"+my[1]) === undefined)
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ZvonkoSystems architectCommented:
Check this:
<script>
var myvalue = [];
myvalue[0] = 2;


var my = [];
my[0] = 123;
my[1] = 4;

if(window["myArray_"+my[0]+"_"+my[1]] == undefined){
   alert("Undefinded.");
   window["var myArray_"+my[0]+"_"+my[1]] = new Array();
}
window["myArray_"+my[0]+"_"+my[1]] = myvalue; // eg: myvalue

alert(window["myArray_"+my[0]+"_"+my[1]]);
</script>

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ZvonkoSystems architectCommented:
Sorry...
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jagkuAuthor Commented:
Hi leakim971 and Silhouette, thanks for this.

Leakim971: I get a syntax error on this line:

eval("myArray_"+my[0]+"_"+my[1]+"[] = " + value + ";" ); // eg myArray_123_4

Any idea why this is?
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leakim971PluritechnicianCommented:
value is a number?

else you have :

myArray_123_4 = hello;

instead :

myArray_123_4 = "hello";

if it's not a number :



eval("myArray_"+my[0]+"_"+my[1]+"[] = \"" + value + "\";" ); // eg myArray_123_4

or

eval("myArray_"+my[0]+"_"+my[1]+"[] = '" + value + "';" ); // eg myArray_123_4

Open in new window

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jagkuAuthor Commented:
Hi,

value is an array (I take in JSON array and want to assign each part of it to myArray_... ).

ie
eval("myArray_"+my[0]+"_"+my[1]+"[] = " + value + ";" ); // eg myArray_123_4

The above string should avaluate to.

myArray_123_4[] = value;

I hope that makes sense?

Thanks

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jagkuAuthor Commented:
Actually, I think I need:

eval("myArray_"+my[0]+"_"+my[1]+"push(value);" );





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jagkuAuthor Commented:
Actually, it should be:

eval("myArray_"+my[0]+"_"+my[1]+".push(value);" );
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