Databases
StackOverflow2013
Postsdbo
POBuilding array and formatting JSON for Google Charting API
 

Note that there are some explanatory texts on larger screens.

plurals
  1. POBuilding array and formatting JSON for Google Charting API
    primarykey
    data
    text
    <p>I am working on a project where I am making use of the Google Charting API and I want to populate the chart using json to build the data table. </p> <p>As a test I am trying to build a simple array before I try and do it with dynamic data from a database but I am having a problem getting the json in the correct format. </p> <p>In the google documentation it says the json content should be in the following:</p> <pre><code>{ "cols": [ {"id":"","label":"Topping","pattern":"","type":"string"}, {"id":"","label":"Slices","pattern":"","type":"number"} ], "rows": [ {"c":[{"v":"Mushrooms","f":null},{"v":3,"f":null}]}, {"c":[{"v":"Onions","f":null},{"v":1,"f":null}]}, {"c":[{"v":"Olives","f":null},{"v":1,"f":null}]}, {"c":[{"v":"Zucchini","f":null},{"v":1,"f":null}]}, {"c":[{"v":"Pepperoni","f":null},{"v":2,"f":null}]} ] } </code></pre> <p>I am calling a function which returns the json code. </p> <p>Below is how the function is called</p> <pre><code>print json_encode(test()); </code></pre> <p>and the test function is </p> <pre><code>function test() { $array = array(); $array['cols'][] = "20-01-13"; $array['cols'][] = "21-01-13"; $array['cols'][] = "22-01-13"; $array['rows'][] = 22; $array['rows'][] = 26; $array['rows'][] = 12; return $array; } </code></pre> <p>The javascript that generates the chart is as follows</p> <pre><code>&lt;script&gt; google.load('visualization', '1', {'packages':['corechart']}); // Set a callback to run when the Google Visualization API is loaded. google.setOnLoadCallback(drawChart); function drawChart() { var jsonData = $.ajax({ url: "loadGraph.php", dataType:"json", async: false }).responseText; var data = new google.visualization.DataTable(jsonData); // Instantiate and draw our chart, passing in some options. var chart = new google.visualization.PieChart(document.getElementById('lineGraph')); chart.draw(data, {width: 400, height: 240}); } &lt;/script&gt; </code></pre> <p>When I echo the json it is being returned in the following format</p> <pre><code>{"cols":["20-01-13","21-01-13","22-01-13"],"rows":[22,26,12]} </code></pre> <p>and if I try and use this for the datasetfor the google chart I get the following message</p> <pre><code>Cannot read property of '1' of undefined </code></pre> <p>I am only building a simple line chart which will just contain a date along the x axis and a count of how many times something happened on that date along the y axis. </p> <p>How do I nee to build up the array to get it in the correct format for the google api chart. </p> <p>Thanks for any help you can provide.</p>
    singulars
    1. PO
      singulars
      1. PTAnswer
    1. This table or related slice is empty.
    1. PTQuestion
    1. USNT3RP
    1. USBoardy
    plurals
    1. This table or related slice is empty.
    1. This table or related slice is empty.
    1. This table or related slice is empty.
    1. PO
      singulars
      1. PTAnswer
    2. PO
      singulars
      1. PTAnswer
    1. VO
      singulars
      1. POBuilding array and formatting JSON for Google Charting API
      1. USBoardy
      1. VTBountyStart
    2. VO
      singulars
      1. POBuilding array and formatting JSON for Google Charting API
      1. This table or related slice is empty.
      1. VTUpMod
    1. COThere is nothing obviously wrong with the data as you have shown it. The problem may be in how you use it, so you should provide a more complete example. Set up a jsfiddle that demonstrates the problem.
      singulars
      1. POBuilding array and formatting JSON for Google Charting API
      1. USdlaliberte
    2. CO@dlaliberte i've added more information
      singulars
      1. POBuilding array and formatting JSON for Google Charting API
      1. USBoardy
    3. COThe json being returned by your php code is obviously not the same as what you expect to output, and what the chart expects as data. So this is a problem with your php test() function that generates the wrong structure to start with. The error from google charts is rather confusing, but beside the point. Sorry I can't help you with the php code.
      singulars
      1. POBuilding array and formatting JSON for Google Charting API
      1. USdlaliberte
 

Querying!

 
Guidance
A row detail

Detail views are divided into sections. All the information in the data section comes from columns in the selected row. The other sections display data from other, related rows.

Related data can be related in a to-one or a to-many fashion. Captions of data related in a to-many fashion link to a list view showing a filtered view of the table.

Try moving around until you find a non-empty to-many entry and click on the label to get to one. You can move back to the root by clicking on the database name in the header.

SQuiL has stopped working due to an internal error.

If you are curious you may find further information in the browser console, which is accessible through the devtools (F12).

Reload