javascript - Google Line Charts interpolateNulls: false breaks chart -


i knew answer going simpler making out be. added following if statement while loop.

<?php                 echo "['month', '$year1' , '$year2' , '$currentyear'],";                 require('./phpconnect.php');                         $statement1 = @mysqli_query($dbc, $query1);                 while($row = mysqli_fetch_array($statement1)){                     if($row["year3"] == null ? $row["year3"] = 'null' : $row["year3"] = $row["year3"]);                     echo "['".$row["month"]."', ".$row["year1"].", ".$row["year2"].", ".$row["year3"]."],";                 }                 mysqli_close($dbc);                 ?>

as update know problem mysql spits out null , javascript requires null. thoughts on how accomplish getting mysql null int value lowercase null.

*i wondering if can me this. created line chart visual show company sales month current year , previous 2. works fine, because @ point there 0 sales remaining months of year shows steep drop off line. don't want see that, tried changing 0s nulls in database , using interpolatenulls false. when add interpolatenulls option line chart breaks , no longer displays anything. ideas?

<script type="text/javascript">         var data;         var chart;         google.charts.load('current', {'packages':['corechart']});         google.charts.setonloadcallback(drawchart);         function drawchart(){                 data = google.visualization.arraytodatatable([                  <?php                 echo "['month', '$year1' , '$year2' , '$currentyear'],";                 require('./phpconnect.php');                         $statement1 = @mysqli_query($dbc, $query1);                 while($row = mysqli_fetch_array($statement1)){                     echo "['".$row["month"]."', ".$row["year1"].", ".$row["year2"].", ".$row["year3"]."],";                 }                 mysqli_close($dbc);                 ?>             ]);              var options = {                 backgroundcolor: 'transparent',                 title:'total sales month',                 width:600,                  height:500,                 interpolatenulls: false,                 legend: {position: 'bottom'}             };             var chart = new google.visualization.linechart(document.getelementbyid('chart_div'));             chart.draw(data, options);         }


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