When declaring an array, I can do it like this:
var positions = [];
Alternatively, I can also declare it like this:
var positions = new array();
Both methods are acceptable.
Later in the script, I add a value like this:
positions[0].top = 0;
Everything works perfectly in all browsers except for IE7, which throws the following error:
Error: Unable to set value of the property 'top': object is null or undefined
Is there another approach I should take to populate the array in IE7?
If you need to add new elements to an array in JavaScript, the function you're looking for is push(). Here is an example of how to use it properly:
var positions = ["something", "something else"];
positions.push("something new");
It's worth noting that the property .top is commonly found in DOM elements, but it is not relevant or applicable to working with arrays like the one shown above.
Instead of adding an object value, make sure to push to an array. To do this, use the .push() method:
var positions = [];
positions.push(value);
positions.push(value2);
With this code, value will be stored at positions[0] and value2 will be stored at positions[1].
If you want to create an object that can be accessed like this:
position.top;
position.bottom;
etc.
Then create an object like this instead:
var positions = {};
positions.top = 0;
positions.bottom = 20;
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