Make graph with google visualization with two arrays

1 answer

Hi I want to make a graph from data in a database using google visualization here is the code i am using:

<?php $connect = mysqli_connect("db_host", "db_name", "db_pass", "db_table");      if(!$connect ) {     die('Connection failed: ' . mysqli_error()); } echo 'Connected successfully';    $tempsql="SELECT `temperature` FROM `apidata`"; $resulttemp = $connect->query($tempsql); $temp=array(); foreach ($resulttemp as $rowtemp){     $temp[]=$rowtemp; } $resulttemp->close();  $idsql="SELECT `id` FROM `apidata`"; $resultid = $connect->query($idsql); $id=array(); foreach ($resultid as $rowid){     $id[]=$rowid; } $resultid->close();  $js_arrayTemp = json_encode($temp); //echo "var javascript_array = ". $js_array . ";\n"; $js_arrayId=json_encode($id); //echo "var javascript_array = ". $js_array2 . ";\n";  mysqli_close($connect); ?> <script type="text/javascript" src="https://www.google.com/jsapi"></script> <script type="text/javascript">  function drawVisualization() {   // Create and populate the data table.   var Temp = <?php echo $js_arrayTemp;?>;   var id = <?php echo $js_arrayId;?>;    var data = new google.visualization.DataTable();   data.addColumn('string', 'id');   data.addColumn('number', 'temp');    for(i = 0; i < id.length; i++)     data.addRow([id[i], Temp[i]]);    // Create and draw the visualization.   new google.visualization.LineChart(document.getElementById('visualization')).     draw(data, {}); }  </script>  

When i look at my website there is no graph. But in the debugger i can see the data Pictue of debugger Picture og debugger 2 Hope someone can see my problem.

All answers to this question, which has the identifier 61208065

The best answer:

can't use an object as a column value, here...

data.addRow([id[i], Temp[i]]); 

where Temp[i] = {"temperature": "6"}

instead, get the value of the object...

data.addRow([parseInt(id[i].id), parseFloat(Temp[i].temperature)]); 

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