Assigning php POST array to Javascript array

Question

I know this may sound similar to some past Q/As, I think mine is slightly different though.. I have a webpage which I want to dynamically load text file information. I upload the text file through an iframe and I want to save this information from php to Javascript. Whenever I try to save this as a regular variable it doesn't work so I have tried to do this by saving this information as a part of the $_POST array under a hidden form named $_POST['hidden_form']. Whenever I try to read the php into Javascript, I keep getting an error "Unexpected token ILLEGAL." I have tried the following two codes:

for($i=0;$i< count($_POST['hidden_form']) ;$i++)
{
  echo "saved_form[$i]='" . $_POST['hidden_form'][$i]. "';\n";
}

and saved_form = <?php echo json_encode($_POST['hidden_form']); ?>;

Assigning a php array into a javascript array

I think the error has to do with the " ' " needed to specify the array but not sure. I have no idea where to go from here so any help would be GREATLY appreciated. If there are better methods to do this please let me know. Thanks in advance!

Did you look at the source generated by this script? Also, there's an XSS attack possible when not sanitizing input of $_POST variables (e.g. use htmlspecialchars). — Marcel Korpel
– Marcel Korpel, Commented Jun 11, 2012 at 15:35
Are there any ' in the strings you're adding to the array? — sachleen
– sachleen, Commented Jun 11, 2012 at 15:36

Lee · Accepted Answer · 2012-06-11 15:39:20Z

0

saved_form = '<?php echo addslashes(json_encode($_POST['hidden_form'])); ?>';

Or

for($i=0;$i< count($_POST['hidden_form']) ;$i++)
{
  echo "saved_form[$i]='" . addslashes($_POST['hidden_form'][$i]) . "';\n";
}

Both should work, probably had quotes breaking something?

answered Jun 11, 2012 at 15:39

Lee

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2 Comments

Niet the Dark Absol Over a year ago

The first one won't work, because json_encode already wraps quotes around whatever is needed.

Lee Over a year ago

It will, it just needs to be passed into a parser (i.e. parseJSON in JQ). My bad though, im used to async loading rather than printing into the document

HotHeadMartin · Accepted Answer · 2012-06-11 15:48:33Z

0

the best way i have used is,

text/javascript

var saved_form = <?php echo json_encode($_POST['hidden_form']) ?>

Please note there are no Quotes around the php so your saved_form is an Object not a string json string witch would require you to to use var form_object = eval(saved_form)

@Lee might have meant this?

Just a note though i would not use the Raw $_POST pass it to a function that can loop though and addSlashes every value inside the post some thing like

<?php
function arr_addSlashes($array){
    $ret = array();
    foreach($array as $k => $v){
        $ret[$k] = addSlashes($v);
    }
    return $ret;
}
?>

answered Jun 11, 2012 at 15:48

HotHeadMartin

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