What is the best way to retrieve an object from d3.data()?

Question

What is the best way to retrieve an object from d3.data()?

My force directed graph contains a variable with all my link data.

var linkData = d3.selectAll(".link").data();

In order to change the class of certain edges based on their values, I am using a for loop to iterate through the data and identify the desired edge. If the edge meets the criteria, I want to change its class to "visible"; otherwise, I want to change it to "hidden".

My challenge lies in determining how to select the specific link in the graph corresponding to linkData[3];. Since linkData only represents the data, I am unsure how to access the actual object.

javascript css d3.js

Answer 1

Answer №1

If you want to narrow down a selection, you can use the filter method:

var selectedLink = d3.selectAll(".link")
             .filter(function(d) { return d === linkData[3]; })
             .attr('stroke', 'red');

Alternatively, based on LeartS's suggestion, you can skip using .data() and filter the desired link directly:

var myLink = d3.selectAll(".link")
             .filter(function(d) { return isThisTheLinkIWant(d); })
             .attr('stroke', 'red');

Answer 2

If you want to narrow down a selection, you can use the filter method:

var selectedLink = d3.selectAll(".link")
             .filter(function(d) { return d === linkData[3]; })
             .attr('stroke', 'red');

Alternatively, based on LeartS's suggestion, you can skip using .data() and filter the desired link directly:

var myLink = d3.selectAll(".link")
             .filter(function(d) { return isThisTheLinkIWant(d); })
             .attr('stroke', 'red');

What is the best way to retrieve an object from d3.data()?

Answer №1

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