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Editorial Team
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Asked: 2026-05-29T06:18:50+00:00

I am somewhat new to JavaScript, and have been having an issue with a

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I am somewhat new to JavaScript, and have been having an issue with a global variable. I have a group id that is part of my php session variables, that I want to place into a JavaScript global variable so that I can access the value in JavaScript. But JavaScript always shows the variable as undefined, so I must be doing somthing wrong. In a nutshell I have the following code:

<head>
   <script type="text/javascript">var group = <?php echo($group)?>;</script>
</head>
<body>
<script type="text/javascript">
   function clicked() {
      alert(window.group);
   }
</script>

When the alert window pops up it shows undefined, but I can tell by look at the source generated, as well as firebug that the value is being set to the variable at one point.

What am I doing wrong?

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1 Answer

  1. Editorial Team

    The best solution for this kind of problem is to always call json_encode when printing a php variable as a JS variable. In your case, it would fail if your string contained a newline, or a quote

    <script type="text/javascript">var group = <?php echo(json_encode($group)) ?>;</script>
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