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POHow do I set a date range variable dynamically and redraw a Google chart?
 

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  1. POHow do I set a date range variable dynamically and redraw a Google chart?
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    <p>I am using PHP to set a date range for creating a Google Line Chart. For each date in the range a variable is set ($running_balance) to create the points on the line chart using data in a database. I would like to be able to set the variable $end, which essentially determines the date range, dynamically, but I am not sure how to do this so that the chart would be redrawn according to this new range. I am aware that I could create a new function that includes <code>drawChart();</code> to redraw the chart, and I would be using three buttons to either set the date range to 1 year, 3 months, or 1 month, but I am not sure how to put all this together. Here is the code that I currently have:</p> <pre><code>$begin = new DateTime(date('Y-m-d', strtotime('+1 days'))); $end = new DateTime(date('Y-m-d', strtotime('+365 days'))); $interval = DateInterval::createFromDateString('1 day'); $period = new DatePeriod($begin, $interval, $end); foreach ( $period as $dt ) { $date_display = $dt-&gt;format("D j M"); ..... code to generate $running_balance ..... $temp = array(); $temp[] = array('v' =&gt; (string) $date_display); $temp[] = array('v' =&gt; (string) $running_balance); $temp[] = array('v' =&gt; (string) $running_balance); $rows[] = array('c' =&gt; $temp); } $table['rows'] = $rows; $jsonTable = json_encode($table); &lt;script type="text/javascript"&gt; // Load the Visualization API and the piechart package. google.load('visualization', '1', {'packages':['corechart']}); // Set a callback to run when the Google Visualization API is loaded. google.setOnLoadCallback(drawChart); var table = &lt;?php echo $jsonTable; ?&gt;; function drawChart() { var data = new google.visualization.DataTable(table); // Create our data table out of JSON data loaded from server. // var data = new google.visualization.DataTable(&lt;?=$jsonTable?&gt;); var formatter = new google.visualization.NumberFormat({fractionDigits:2,prefix:'\u00A3'}); formatter.format(data, 1); var options = { pointSize: 5, legend: 'none', hAxis: { showTextEvery:31 }, series: {0:{color:'2E838F',lineWidth:2}}, chartArea: {left:50,width:"95%",height:"80%"}, backgroundColor: '#F7FBFC', height: 400 }; // Instantiate and draw our chart, passing in some options. //do not forget to check ur div ID var chart = new google.visualization.LineChart(document.getElementById('chart_div')); chart.draw(data, options); } &lt;/script&gt; </code></pre>
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    1. COYou should make (at least) two separate functions. Function #1 will retrieve data. Function #2 will call the data-retrieving function and draw the chart. When you click a button/change a dropdown, it should call a handler function that will get the appropriate data and send it to the chart drawing function. Basically, take the first half of your code (before `drawChart()`) and turn it in to a function that accepts the $end parameter. Have you tried something like that already?
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      1. USjmac
 

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