Having trouble with KnockoutJS and its foreach functionality

Having trouble looping through an object using foreach in my code - the struggle is real after 6 months of not coding!

This code snippet works perfectly:

<div data-bind="text: $root[36].partition"></div>

But I can't seem to get the foreach loop to work:

 <div data-bind="foreach: $root">
  <div data-bind="text: $data.partition"></div>
 </div>

When I check my HTML, all I see is:

<div data-bind="foreach: $root"></div>

The JSON data from the PHP script is structured like this, with partition IDs 09, 10, and 36:

top level
    09
      partition
      vip
    10
      partition
      vip
    36
      partition
      vip

Just playing around with my JS code, nothing fancy:

$(document).ready(function() {

    var viewModel = {};
    $.getJSON('/lbstat/read.php', function(data) {
        viewModel = ko.mapping.fromJS(data);
    ko.applyBindings(viewModel);
    });

});

Here's a snippet of the JSON data:

{"23":{
     "partition":"Prod New SVCs Partition",
     "env_dc":"Prod",
     "hosts":["server01.domain.com", "server02.domain.com"],
     "vips":{
           "124":{
               "dc_endpoint":"ADX - Prod - Intranet",
               "gw_port":"9007",
               "vip_name":"adx-prd.domain.net"
                },
           "210":{
               "dc_endpoint":"Msg - Prod - Internet",
               "gw_port":"8013",
               "vip_name":"messaging-prd.domain.com"
                 },
           "211":{
               "dc_endpoint":"Msg - Prod - Intranet",
               "gw_port":"9013",
               "vip_name":"messaging-prd.domain.net"}
              },
          }
    }

Full JSON available here: http://pastebin.com/zpNngr53

Can you help me figure out what I'm doing wrong here?

Answer №1

It is important to note that you cannot use a foreach loop on an object, as it only works with arrays. In the case of the JSON data provided, it consists of properties with numerical names, making it an object rather than an array. This is why the syntax $root[36] retrieves the value of property "36", not the index of an array element.

If the data structure was an array instead of an object, your code would function as expected.

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