jquery - how to counts parent in an javascript object (getting not defined error) -

i trying make object number of parents of element . have array of objects .in there 2 field to , from .i want calculate length of parents here code ?

example

• "node_from": 11, don't have parent ..it don't have to field .so length 0,zero;
• "node_from": 12, coming 11 .so have parent .so parent length 1 or 1 , same in 13 , 14,16,18,19.
• "node_from": 15, has 2 parent coming 13 , 14 ..so length 2 .

can find

here code

https://jsfiddle.net/ood2ezvz/2/

var obj={} for(var i=0;i<node.length;i++){  console.log(node[i]); var node=node[i] if(obj.hasownproperty(node.node_from)){ obj[node_from]=obj[node_from]++; }else{ obj[node_from]=0; }  } console.log(obj) 

it giving error ?

expected out put { 11:0, 12:1, 13:1, 14:1, 15:2, 16:1, 17:1, 18:1 19:1 }

assuming "node_from" id of current node, , "node_to" children each node points to. here function can count children of each node.

var node=[    {           "node_from": 11,      "children": [        {          "node_to": 12        }      ]    },    {           "node_from": 12,      "children": [        {          "node_to": 13        },        {          "node_to": 14        }      ]    },    {      "node_from": 13,      "children": [        {          "node_to": 15        }      ]    },    {            "node_from": 14,      "children": [        {          "node_to": 15        }      ]    },    {           "node_from": 15,      "children": [        {          "node_to": 16        },        {          "node_to": 17        },        {          "node_to": 18        }      ]    },    {            "node_from": 16,      "children": [              ]    },    {      "node_from": 17,      "children": [              ]    },    {            "node_from": 18,      "children": [        {          "node_to": 19        }      ]    },    {            "node_from": 19,      "children": [              ]    }  ];    function countparents(nodes, num){    var count = 0;    for(var i=0;i<nodes.length;i++){    	if(nodes[i].children){      	for(var e=0;e<nodes[i].children.length;e++){          if(nodes[i].children[e].node_to == num)            count++;        }      }    }    return count;  }    function counteachparents(nodes){    var output = [];    for(var i=0;i<nodes.length;i++){      output.push( nodes[i].node_from + ":" + countparents(nodes, nodes[i].node_from) );    }    return output;  }    document.getelementbyid( "output" ).innerhtml = counteachparents(node).join(", ");

{<span id='output'></span>}

https://jsfiddle.net/zwttlty7/

personally use oop methods handle this...

function node(id, children){    this.id = id;    this.children = children || [];    this.countparents = function(nodelist){      var count = 0;      for(var i=0;i<nodelist.length;i++){        if(nodelist.children.indexof(this.id) > -1)          count++;      }      return count;    };  };  function nodelist(nodes){    this.list = nodes || [];    this.parentcounts = function(){      var output = [];      for(var i=0;i<this.list.length;i++){        var count = 0;        for(var e=0;e<this.list.length;e++){          if(this.list[e].children.indexof(this.list[i].id) > -1)            count++;        }        output.push(this.list[i].id+":"+count);      }      return output.join(", ");    }  };    var nodes = new nodelist([    new node(11, [12]),    new node(12, [13,14]),    new node(13, [15]),    new node(14, [15]),    new node(15, [16,17,18]),    new node(16),    new node(17),    new node(18, [19]),    new node(19)  ]);    document.getelementbyid("output").innerhtml = nodes.parentcounts();

{<span id='output'></span>}

https://jsfiddle.net/otcm76oy/