javascript - d3.js, collapsible tree - how to connect different parents with same child - Stack Overflow

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So I am using to create a collapsible tree and it works great.

Now the thing is I have some nodes which have the same children, so I want to know if there is any way to visualize the graph in such a way that both the parents expand to the same child?

So basically when you expand the node of a parent it should automatically expand the node of the other parent leading to the same mon child, is this possible with any graph?

So I am using http://bl.ocks/mbostock/4339083 to create a collapsible tree and it works great.

Now the thing is I have some nodes which have the same children, so I want to know if there is any way to visualize the graph in such a way that both the parents expand to the same child?

So basically when you expand the node of a parent it should automatically expand the node of the other parent leading to the same mon child, is this possible with any graph?

• javascript
• svg
• d3.js
• directed-acyclic-graphs

Share Improve this question Follow edited Jan 15, 2015 at 15:34 VividD 10.5k88 gold badges6666 silver badges112112 bronze badges asked Dec 31, 2013 at 7:19 X-joX-jo 60111 gold badge66 silver badges1313 bronze badges 5

• Maybe a collapsible force layout is more suitable for you? – Lars Kotthoff Commented Dec 31, 2013 at 9:50
• its still the same, two parents don't expand to one node. ViviD says in the response that this can't be done by d3 alone. – X-jo Commented Dec 31, 2013 at 14:12
• 1 It can be done in D3, just not with the existing layouts. It would be easier to implement with a force layout than with a tree layout though. – Lars Kotthoff Commented Dec 31, 2013 at 14:38
• stackoverflow./questions/20525458/… i will try this, thanks – X-jo Commented Jan 1, 2014 at 10:18
• X-jo can you post your findings? – mehmet Commented Dec 26, 2015 at 18:22

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1 Answer 1

Sorted by: Reset to default 6

From your description, I gather you need to visualize directed acyclic graph, or DAG.

Tree is:

A
|\
B C
 / \
D   E

DAG is:

A
|\
B C
 \|
  D

And, no, unfortunately, D3 tree and cluster layouts simply don't support that kind of graphs. Their internal algorithms assume that the data structure is strictly a tree.

However, there are some options. Please see these five related questions for possible approaches:

d3 tree - parents having same children

How to layout a non-tree hierarchy with D3

d3.js tree nodes with same parents

Layered graphs in d3.js

JS library for displaying direct acyclic graphs (DAGs)

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