Get Next and Previous Elements in JavaScript array
arrays, javascript
Solution
Why don't you add properties 'Prev' & 'Next' to that array?
PhotoList[89725] = new Array();
PhotoList[89725]['Prev'] = 89724;
PhotoList[89725]['Next'] = 89726;
PhotoList[89725]['ImageID'] = '89725';
PhotoList[89725]['ImageSize'] = '123';
This is just 'doubly-linked list' data structure.
Problem
I have a large array, with non-sequential IDs, that looks something like this: ``` PhotoList[89725] = new Array(); PhotoList[89725]['ImageID'] = '89725'; PhotoList[89725]['ImageSize'] = '123'; PhotoList[89726] = new Array(); PhotoList[89726]['ImageID'] = '89726'; PhotoList[89726]['ImageSize'] = '234'; PhotoList[89727] = new Array(); PhotoList[89727]['ImageID'] = '89727'; PhotoList[89727]['ImageSize'] = '345'; Etc.... ``` I'm trying to figure out, given an ID, how can I can get the next and previous ID... So that I could do something like this: ``` <div id="current">Showing You ID: 89726 Size: 234</div> Get Prev Get Next ``` Obviously, if we're at the end or beginning of the array we just a message...