Accessing a JavaScript array using a value passed into a function

Question

I have a JavaScript array declared in my JavaScript page like so:

var example = [[20,870,5,1,1,16],[28,1250,8,1,1,23]];

This works fine when accessed elsewhere.

I have a checkbox in my HTML page like so:

<input type="checkbox" id="example" onChange="update('example')">Example

I want the function to look something like below. The variable being passed is also the name of my JS array. I will have 20-30 check boxes and I would ideally like to avoid a load of if/else statements.

function update(a) {

alert(a[0][1]);

}

Is there anyway to use the variable passed into my function to access the namesake JS array?

Thanks

You mean like update(example) ? This is very bad code design though. — Alexander O'Mara
– Alexander O'Mara, Commented Apr 23, 2016 at 2:40

guest271314 · Accepted Answer · 2016-04-23 02:40:57Z

1

If example is defined, you can remove quotes surrounding parameter example at update(example) call

<script>
  var example = [
    [20, 870, 5, 1, 1, 16],
    [28, 1250, 8, 1, 1, 23]
  ];

  function update(a) {
    alert(a[0][1]);
  }
</script>

<input type="checkbox" id="example" onchange="update(example)">Example

answered Apr 23, 2016 at 2:40

guest271314

1

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Comments

pgraham · Accepted Answer · 2016-04-23 02:40:36Z

0

Try

function update(a) {
    alert(window[a][0][1]);
}

answered Apr 23, 2016 at 2:40

pgraham

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