从PHP传递JQPlot的值

Question

As a novice js and jqplot programmer, I need guidance on passing an array of value from php to an external javascript for plotting (using jqplot). I am confused about the order and how html, php & external js, jqplot is called. A short sample code structure will be very helpful to follow. We may use the following sample codes as guide. Thanks

$(document).ready(function(){
  var plot1 = $.jqplot ('chart1',[[3,7,9,1,4,6,8,2,5]],{title: 'Plot'});
});

Instead of the fixed data points above, I want them to dynamically loaded via an array from the following php script.

<?php
  $Start_Value = $_POST['Start'];
  $End_Value = $_POST['End'];

  for($i=$Start_Value;$i<=$End_Value;$i+++)
     $Plot_Val[$i] = $i + 2;
  json_encode($Plot_Val);
?>

Answer 1

You have several options. Here are the 2 easiest:

1. Just 'paste' the array from PHP as a JavaScript global variable.
   Add <script>var myData = <%= json_encode($Plot_Val); %>;</script> at the top of your page and then use myData in place of the data array.
2. Even better option is to use Ajax to call the PHP page from JavaScript and get the results , separating front-end and back-end code.