invalid index error in javascript

Question

we have a website where the users occasionally gets invalid index when trying to move some items from one list box to another. when we try to do the same thing it doesn't happen. so we are not sure how that is happening. It seems like the script is trying to access an element in the array that doesn't exist or something like that. Is there a way to check if the array item to avoid this error?

Thanks, sridhar.

mck89 · Accepted Answer · 2009-08-27 15:31:52Z

1

array=new Array();
index=0;
if(array[index]!=undefined) ///Now users are happy because it gives true also if that element is 0 or ''

That condition is true only if an element in array with index position exists

edited Aug 27, 2009 at 15:31

answered Aug 27, 2009 at 15:15

mck89

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2 Comments

Colin Over a year ago

This isn't PHP, but Javascript. It does provide the answer though

Ionuț G. Stan Over a year ago

And is not a falsy value like 0, "" or null.

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