use a php SESSION string for d3.js tree JSON instead of .json file

Question

I have a nice working d3.js-tree as long as I use JSON-data from a .json-file. But now, I want to give the opportunity to the customer to individualize the tree in some ways. For me it seems logical therefore, to use the SESSION to hold the respective JSON-String and to load this SESSION-variable into my tree-script.

Therefore, I use window.SESSION like this and parse the string to JSON.

 var treedatajson = JSON.parse(window.SESSION.filtered_tree);

But this seems not to work. The string must be ok, as I can copy it into a file and load a functioning tree with the following code:

 var treedatajson = "filtered_tree.json";

Why doesn't JSON.parse() work that way? And what can I do to get this running?

Any idea? Thanks in advance!

Let me know if there is something unclear or you need more code for context.

Alex028502 · Accepted Answer · 2018-02-25 14:14:49Z

1

looks like in var treedatajson = "filtered_tree.json"; when it worked you were passing in the filename, and in var treedatajson = JSON.parse(window.SESSION.filtered_tree); you were passing in the json data. What is the next line where you use treedatajson? You are probably looking for a filename there instead of the parsed data.

... or maybe you should create a php endpoint that serves the session data as json... something like

<?php
// filtered-tree.php
session_start()
header('Content-Type: application/json');
echo json_encode($_SESSION['TREE']); // or whatever the key is

and then in js

var treedatajson = "filtered-tree.php";

edited Feb 25, 2018 at 14:14

answered Feb 25, 2018 at 13:36

Alex028502

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4 Comments

Maki Over a year ago

Sorry, something went wrong... Here again: it is the tree after this example: gist.github.com/robschmuecker/7880033 And the next line is the function for creating the tree and its routines: treeJSON = d3.json(treedatajson, function(error, treeData) { To be honest, I don't know whether it only refers to the file/path or directly uses the json.... I'll try to change things to check that....

Alex028502 Over a year ago

this might help stackoverflow.com/questions/15764698/…

Maki Over a year ago

you're my hero :D I overwrite the treeData within the function with my parsed JSON-string, which works very well. Thanks for the link :)

Maki Over a year ago

ok, your idea with the .php probably also works... but I think in my case, a solution without an aditional file would be better.

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