Getting value GET OR POST variable using JavaScript?

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You can’t get the value of POST variables using Javascript, although you can insert it in the document when you process the request on the server.

<script type="text/javascript">
    window.some_variable="<?=$_POST["some_value']?>'; // That's for a string
</script>

GET variables are available through the window.location.href, and some frameworks even have methods ready to parse them.

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