send json to datapoint

Question

Hi, I’m Antonio, i’m, new to this, and I’m trying to send via json_encode, data to make a bar chart but I think it does not interpret the json well. This is the simple array inside of php code: *** $dataPoints = array( array(“label”=> “TPV 1”, “y”=> $f_1[0]), array(“label”=> “TPV 2”, “y”=> $f_2[0]), array(“label”=> “TPV 3”, “y”=> $f_3[0]), array(“label”=> “TPV 4”, “y”=> $f_4[0]) ); *** This is the echo json_encode($dataPoints, JSON_NUMERIC_CHECK); result: [{“label”:”TPV 1″,”y”:75},{“label”:”TPV 2″,”y”:657},{“label”:”TPV 3″,”y”:119},{“label”:”TPV 4″,”y”:92}] (I think it’s right, if i put this code in the script function, work perfectly) *** Code in head: … ***** And the code of the body:

******* can someone tell me why the error is caused? if I use the json_encode it does not draw the data. Legends appear but do not interpret the data Thanks to all, and sorry for my bad english

tekit0 · Answer

Now work really fine! thank u so much Priyanka !!!!!! 
my problem was that the date selector kept appearing, but in the end what I did is that I send the date from the form with get and I show all the data in a second web.

tekit0 · Answer

I try again...

priyanka · Answer

@tekit0,
The sample project that we have provided is working fine at our end. Please try to follow the above-mentioned instructions and it should work fine for you.  
in the end, I call the chartcontainer, but this has no information, because it has not returned to the head.
Please make sure that the dataPoints are defined before rendering the chart.

__
Priyanka M S
Team CanvasJS

tekit0 · Answer

It does not work for me.
The purpose of the web is to select a date in a form, and in that same web, to show the queries that are made to the database and that canvasjs draw the graph with the sales data.

I check that the data enters the array:

array in json with numeric check: 
[{"label":"TPV 1","y":2},{"label":"TPV 2","y":2},{"label":"TPV 3","y":2},{"label":"TPV 4","y":482}]

which I do not know why canvasjs does not draw it :(

----
I think canvasjs has no data because it runs in head.
- first: canvas draws the graph (but no have data).
- second: I request the date in the form.
- third: I make operations with data, variables, I draw the html table ...
- 4: in the end, I call the chartcontainer, but this has no information, because it has not returned to the head.

tekit0 · Answer

Ok. I try this weekend.
Thanks

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send json to datapoint