D3js Multi line graph convert from using CSV file - php

Question

I am looking to make a multi line graph from this example.
Instead of using data from a CSV file I'm building an array of values from the database:
$token_prices = sw::shared()->prices->getForTokenID($token_id);
$token_prices_array = array();
foreach ($token_prices as $token_price) {
$token_prices_array[] = [
"date" => $token_price['date'],
"close" => $token_price['close']
];
}
$second_token_prices = sw::shared()->prices->getForTokenID(3);
$second_token_prices_array = array();
foreach ($second_token_prices as $second_token_price) {
$second_token_prices_array[] = [
"date" => $second_token_price['date'],
"close" => $second_token_price['close']
];
}
$all = array_merge($second_token_prices_array, $token_prices_array);
foreach ($all as $datapoint) {
$result[$datapoint['date']] []= $datapoint['close'];
}
Data output:
{"15-Jun-18":["8.4","0.14559"],"16-Jun-18":["8.36","0.147207"],"17-Jun-18":["8.42","0.13422"],"18-Jun-18":["8.71","0.146177"],"19-Jun-18":["8.62","0.138188"],"20-Jun-18":["8.45","0.128201"],
My issue is with plugging the data from the database in:
var tokendata = <?php echo json_encode($result) ?>;
data = tokendata;
data.forEach(function(d) {
d.date = parseTime(d.date);
d.close = +d.close;
d.open = +d.open;
});
I get an issue here "data.forEach is not a function"...
How can I fix this to use the data from the database?
Here is the Fiddle

Answer 1

It looks like you are embedding the results of the query php page as a JSON string -- if you want to iterate over that data as an array, you will have to parse it back into a Javascript object first.
I'm assuming that the first code snippet is running on a different server, and so the $result array is not directly available to your javascript code -- is this why you are trying to set a variable to the encoded return value? If so, it's not the best way to pull data into your page's script, but this may work for you:
var data = JSON.parse('<?php echo json_encode($result)?>');
or even:
var data = eval(<?php echo json_encode($result)?>);
Both methods assume that your result is returned as a valid json string, since there is no error checking or try/catch logic. I honestly don't know what the output of the json_encode() method looks like, so if you still can't get it working, please update your post with an example of the returned string.