JQuery retriving the next greatest element

Question

Hi,

in JQuery i m having an array like

(1,2,6,8)

I have already selected the first element that is 1 which i have saved in a JQuery variable

submitterid = 1

On clicking a link I am trying to get the next greatest element in the Array than what I have selected in the submitterid..

How can I achieve this?

Edit:

How to find the last element in this array in the code

  var previousId;

               $("#previous").click(function (){


   index = submitters.indexOf(submitterid),
       nextId;
   if (index - 1 < submitters.length) {
       previousId = submitters[index-1];
   } else {
       // no ID index

        // if i am having an array of 1,2,6,8 after moving to 1 from 8 to 6 - 2-1 i am trying to move to the last element of the array
   }

   alert(previousId);




     });// previousId

Answer 1

Why couldn't you do something like:

var arr = [3, 5, 8, 3].sort(function (a, b) { return a - b; } );
var val = arr.pop();

Any keep popping the array -- saying that the values don't need to stay in the array.

If you are randomly picking values and you need the next highest, then write the appropriate sorting function.

Answer 2

You have to loop through the array. Try this untested code:

// Your test array.
var arrValues = [ "1", "2", "6", "8" ];

var low = 1;
var high = 2;

// Loop over each value in the array.
$.each( arrValues, function( intIndex, objValue ){

if (objValue > high)
  hight = objValue;

if (objValue < high)
  if (objValue > low)
    low = objValue

});

return low;

Answer 3

Actually, there is no need to use any jquery-specific stuff for this, apart from the click event handling, just 'plain javascript' will do;

var myArray = [ 1, 2, 6, 8 ];
var submitterid = 1;

$(function() {
  $('a#id').click(function(event) {
    event.preventDefault();
    var greater = -1;
    // loop through array
    for (var i in myArray)
      // find numbers greater than the specified number
      if (i > submitterid)
        // find numbers closest to specified number
        if (i < greater || greater < 0)
          greater = i;

    if (greater < 0) {
      // no greater value found, do something
    } else {
      // next biggest value is in variable greater, do something with it
    }
  });

});

Answer 4

You want a counter:

function counter(arr) {
  this.arr = arr;
  this.index = 0;
}

counter.prototype.next = function() {
  return this.arr[this.index++];
}

You instantiate it and use it like:

var nums = new counter([1,2,3,4,5]);
nums.next() ; => 1
nums.next() ; => 2
nums.next() ; => 3

Answer 5

If your array is already sorted (see sort method), try this:

var arr = [1,2,6,8],
    submitterid = 1,
    index = arr.indexOf(submitterid),
    nextId;
if (index + 1 < arr.length) {
    nextId = arr[index+1];
} else {
    // no ID index
}