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How can i assign value of a javascript variable using php variable

 $(function(){
    $("select[name=myselectlist]").change(function(){
        var id = $(this).val();
        if(id != 0) {       
            $.post("ajax.php", {"id":id}, function(){
                var data = "somedatahere";
                document.getElementById("namesurname").value = data;
            });
        }
    });
});

the code above works perfectly without php.Yet, i need to assign "var data" from mysql everytime.

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Possible duplicate of Pass a PHP string to a Javascript variable (and escape newlines) and a gazillion others. – deceze Aug 15 at 10:51
1  
For that purpose you can use $.ajax in jquery – lord_linus Aug 15 at 10:52

3 Answers

up vote 4 down vote

If your php var is in the scope of the file where you have this function, you can do it like this:

var data = "<php echo $myvar; ?>";
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Note: even if php var doesnt belong here you can assign the SESSION variable similarly – Shadowfax Aug 15 at 11:00
idk why but it doesnt work for me, i mean when i use like; document.getElementById("namesurname").value = <?php echo $data['name']; ?>; value of text field with namesurname id doesnt change. – Burak KOÇAK Aug 15 at 12:02
Try with the php var in quotes. If not worked cross check that $data['name'] is valid – Shadowfax Aug 15 at 12:46
up vote 2 down vote

1) You can do as Shadowfax wrote but more simple:

var data = '<?=$dbResult?>';

2) More correct. Pass your result to AJAX response with json_encode function in PHP so you can rewrite your JavaScript code block as follows:

...
$.post("ajax.php", {"id":id}, function(response){
    $("#namesurname").val(response.data);
});

For example your PHP code block in backend may look like this:

....
if (isset($_SERVER['HTTP_X_REQUESTED_WITH']) AND strtolower($_SERVER['HTTP_X_REQUESTED_WITH']) === 'xmlhttprequest')) {
    echo json_encode(array('data' => $dbResult));
}
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up vote 1 down vote

If this javascript code is in the php file, then you can simply use php variables as updated in the code:-

<?php
// assign a value
$data = 'your data here';
?>

$(function(){
    $("select[name=myselectlist]").change(function(){
        var id = $(this).val();
        if(id != 0) {       
            $.post("ajax.php", {"id":id}, function(){
                var data = "somedatahere";
                document.getElementById("namesurname").value = "<?php echo $data;?>";
            });
        }
    });
});
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