使用ajax和php写入JSON文件。 服务器未收到POST

Question

I tried following the steps in a few other stackoverflow questions, but for some reason my server is not showing any indicator of recieving a request. I know that the client is sending the request since it shows up in firefox debugger. Here is the js method:

function writeToFile(dat) {
    $.ajax({
        url     : 'dataSaveAjax.php',
        method  : 'post',
        data    : { 'data': JSON.stringify(dat) },
        success : function( response ) {
            alert( response);
          }
    });
}

PHP code:

<?php
    $fp = fopen('general.json', 'w');
    fwrite($fp, json_encode($_POST['data']));
    fclose($fp);
?>

Answer 1

Try updating your code like that

<?php
$fp = fopen('general.json', 'w');
$writtingResponse = fwrite($fp, $_POST['data']);
fclose($fp);
echo $writtingResponse;

?>

You did not write any response and you encode json twice.

Answer 2

first you need to understand what is the reason and why our script does not work. First, let's look at the server part (php). First, put the data in a variable, instead of $ _POST ['data'] try to do something like:

<?php
    $fp = fopen('general.json', 'w');
    fwrite($fp, 'MyTest');
    fclose($fp);
?>

If this does not work, most likely the reason is that you need to set the write permissions for the file ( Chmod ).

If everything is recorded correctly, then something is wrong with the client part of your site. When it comes to POST / GET queries, I usually use Postman . It allows not only to test requests, but also to generate code. If you run a query through Postman and the result is written to a file, then the error is unambiguous in javascript. Try to press F12 in the browser and go to the js console, there you will see an error message. Do you use jQuery in the example, and is it connected? Is it connected before you try to execute the script? Try to look at the data that you are trying to send using console (F12)

console.log(JSON.stringify(dat));

Are your data really going to be collected, or are you trying to send empty data to the file?