Question

Here is a short sample of the object I am working with.

{
    "myservices": [
        {
            "name": "oozie",
            "hostidn": "1",
            "details": "failed process health monitor....",
            "currstatus": "Warning",
            "currstatusclass": "warning"
        },
        {
            "name": "oozie",
            "hostidn": "2",
            "details": "failed process health monitor....",
            "currstatus": "Warning",
            "currstatusclass": "warning"
        },
        {
            "name": "oozie",
            "hostidn": "3",
            "details": "failed process health monitor....",
            "currstatus": "Warning",
            "currstatusclass": "warning"
        },
        {
            "name": "oozie",
            "hostidn": "4",
            "details": "failed process health monitor....",
            "currstatus": "Warning",
            "currstatusclass": "warning"
        },
        {
            "name": "oozie",
            "hostidn": "5",
            "details": "failed process health monitor....",
            "currstatus": "Warning",
            "currstatusclass": "warning"
        },
        {
            "name": "single-namenode",
            "hostidn": "2",
            "details": "failed process health monitor....",
            "currstatus": "Warning",
            "currstatusclass": "warning"
        }
    ]
}

I ultimately want to find what the highest “hostidn” is before running through all these and displaying them. hostidn is a Nth number it can be the only number or it can be hundreds deep with several duplicates in between. My Goal is to find that highest one and do a for or while loop on it based on that to group them together in a visual display. Example notice I have one hostidn below with the number 2 while all the rest have there own. I would want to group the two with 2 together in a box for display but there is 5 different hostidn in this scenario. I dunno maybe I am thinking it over wrong I’ll take suggestions however.

Answer 1

basic algo you can follow

declare and set a variable to zero like

$currentHighest=0;

then iterate over the json array and on each iteration campare the value of hostidn with the $currentHighest if the value is higher than the value already existing in the $currentHighest set that value to $currentHighest

$currentHighest=0;
 $(data.myservices).each(function(index, element){
   if(data.myservices[index].hostidn>$currentHighest)
     $currentHighest=data.myservices[index].hostidn;
  });
//loop ends and `$currentHighest` will have the highest value

at the end of the iteration you will get the highest value in the $currentHighest

Tried and tested

$(function(){
 $.post("highest.json",function(data){
 $currentHighest=0;
  $(data.myservices).each(function(index, element){
   if(data.myservices[index].hostidn>$currentHighest)
     $currentHighest=data.myservices[index].hostidn;
  });
alert($currentHighest);
},'json');
});