Passing a js array to PHP

Question

Why can't I access my array through $_POST in PHP? I'm trying to use the jQuery $.post method. Here is the corrected code with your suggestions:

My javascript:

<script type="text/javascript">
var selectedValues;
var serializedValues;
$("td").click(function() {
$(this).toggleClass('selectedBox');

// map text of tds to selectedValues
selectedValues = $.map($("td.selectedBox"), function(obj) {
        return $(obj).text();

});

serializedValues = JSON.stringify(selectedValues);

// $.post('/url/to/page', {'someKeyName': variableName}); //exemple
$.post('handler.php', 
      {'serializedValues' : serializedValues}, 
      function(data) {
        //debug 
     }
);

});

</script>

My php:

<?php
if(isset($_POST['serializedValues'])) {

            var_dump($_POST['serializedValues']);
            $originalValues = json_decode($_POST['serializedValues'], 1);
            print_r($originalValues);

        }


?>

Have you looked at what you're getting at the server using var_dump($_POST)? — Jared Farrish
– Jared Farrish, Commented Jun 17, 2012 at 13:26
have tried var_dump($_POST), empty array, gonna work on this i guess — h1ghfive
– h1ghfive, Commented Jun 17, 2012 at 13:38
it is strange because i have performed some debug with alert() and each i click on the items i want, an array correctly generated with the correct value. @Dr.Molle, the content of serializedValues is just a serialization of the selectedValues, and it is generated properly too — h1ghfive
– h1ghfive, Commented Jun 17, 2012 at 13:39
Side note: most browsers have kind of developer tools panel. There you can inspect what is actually send when you make an AJAX request. — madfriend
– madfriend, Commented Jun 17, 2012 at 14:04

Daniil Ryzhkov · Accepted Answer · 2012-06-17 13:27:37Z

4

You should serialize your array into json string:

serializedValues = JSON.stringify(selectedValues)

And pass it to php. And then decode with json_decode:

$originalValues = json_decode($_POST['serializedValues'], 1);

http://php.net/manual/ru/function.json-decode.php

answered Jun 17, 2012 at 13:27

Daniil Ryzhkov

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20 Comments

h1ghfive Over a year ago

thanks, i've read tons of stuff about json, but i was a bit afraid. I will try, seems like everyone love this now ^^

h1ghfive Over a year ago

well, i've tried this. But the problem still remain the same, when i issue an isset($_POST['serializedValues']) in php, nothing is found.

Daniil Ryzhkov Over a year ago

what does var_dump($_POST['serializedValues']) say?

h1ghfive Over a year ago

Well i figured out why it was strange, the output of console.log(selectedValues) was wrong from me. Big mistakes from me on the other version of the file, so it shows : ReferenceError: selectedValues is not defined

h1ghfive Over a year ago

It's a scope problem, i need to declare selectedValues outside of the click() function. If I do that, console.log(selectedValues) output properly now, and console.log(JSON.stringify(selectedValues) output properly aswell

|

altschuler · Accepted Answer · 2012-06-17 14:32:09Z

2

On a side note; your javascript could be refactored into something a bit more simple

$("td").click(function() {
    $(this).toggleClass('selectedBox');

    // map text of tds to selectedValues
    var selectedValues = $.map($("td.selectedBox"), function(obj) {
            return $(obj).text();
    });

    // $.post('/url/to/page', {'someKeyName': variableName}); //exemple
    $.post('handler.php', 
          {'serializedValues' : JSON.stringify(serializedValues)}, 
          function(data) {
            //debug 
         }
    );
});

edited Jun 17, 2012 at 14:32

answered Jun 17, 2012 at 13:34

altschuler

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4 Comments

h1ghfive Over a year ago

i really like the way you select td, thanks for the lesson :)

h1ghfive Over a year ago

ive tried it but seems like your map function doesn't push the values of td properly. when i alert(selectedValues), it just shows me ",".

h1ghfive Over a year ago

ah, had to change $(this) by $(obj), pretty obvious

altschuler Over a year ago

oh, sorry, edited that. also I removed the .filter(), since there's no benefit in using it in this case instead of a normal selector

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