CODEWITHSUNDEEP
javascriptd3.js
Rajeshwar N.
Rajeshwar N.

Reputation: 13

Error link is not defined

This is my code from the html file in script tag

var links;
d3.json("sample.json",function(json){links=json;});

var inputlinks=[];
var nodes = {};

inputlinks.push(links);
// Compute the distinct nodes from the links.
links.forEach(function(link) {
link.source = nodes[link.source] || (nodes[link.source] = {name: link.source, type:link.type});
link.target = nodes[link.target] || (nodes[link.target] = {name: link.target, type:link.typeKBP});
    });

In this code am getting an error

    TypeError: links is undefined
    links.forEach(function(link)

Upvotes: 0

Views: 735

Answers (2)

Emilio Rodriguez
Emilio Rodriguez

Reputation: 5749

From the information you provide I can only guess that you should include all your loginc inide the callback:

var links;
d3.json("sample.json",function(json){
    links=json;
    var inputlinks=[];
    var nodes = {};

    inputlinks.push(links);
    // Compute the distinct nodes from the links.
    links.forEach(function(link) {
    link.source = nodes[link.source] || (nodes[link.source] = {name: link.source, type:link.type});
    link.target = nodes[link.target] || (nodes[link.target] = {name: link.target, type:link.typeKBP});
    });   
});

Upvotes: 2

Lars Kotthoff
Lars Kotthoff

Reputation: 109232

As pointed out in the comments, d3.json is an asynchronous call. This means that the code in the handler function will be run when it returns, not immediately. The code after it is run immediately though.

To fix, move the rest of the code inside the handler function:

d3.json("sample.json",function(json){
  var links = json;
  var inputlinks=[];
  var nodes = {};

  inputlinks.push(links);
  // Compute the distinct nodes from the links.
  links.forEach(function(link) {
  link.source = nodes[link.source] || (nodes[link.source] = {name: link.source, type:link.type});
  link.target = nodes[link.target] || (nodes[link.target] = {name: link.target, type:link.typeKBP});
  });
});

Upvotes: 2

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