通过ajax发送后如何访问另一个页面中的数组

Question

I have a array student . I need to pass this array in another php page via POST , not from GET , because it can contains thousands of characters.

I am trying to open new page sheet.php and echo the array student , I do simply checking echo $_POST['mnu'] , but it is showing undefined index error.

var http = null;
if(window.XMLHttpRequest){
    http = new XMLHttpRequest();
}
else{
    http = new ActiveXObject('Microsoft.XMLHTTP');
}
http.open('POST','sheet.php',true);
http.setRequestHeader('Content-type','application/x-www-form-urlencoded');
http.onreadystatechange = function(){
    if(http.readyState==4 && http.status==200){
        window.open('sheet.php','_blank')
    }
}
http.send('mnu='+JSON.stringify(student));

Answer 1

Like @RamRaider commented.. you're making two requests to sheet.php . The first being a "silent" POST request and the second being a GET request after the first POST request has successfully completed.

The second request won't share the payload of the first.

If I under stand correctly the below code should do what you are wanting...

// Create a form element
// <form action="sheet.php" method="post"></form>
var tempForm = document.createElement('form');
tempForm.setAttribute('action', 'sheet.php');
tempForm.setAttribute('method', 'POST');
tempForm.setAttribute('target', '_blank'); // Open in new tab

// Create an input field
// <input name="mnu" value="...">
var tempInput = document.createElement('input');
tempInput.setAttribute('name', 'mnu');
tempInput.setAttribute('value', JSON.stringify(student)); // Set field value

// Add the input to the form
tempForm.appendChild(tempInput);


// Add the form to the body in order to post
document.body.appendChild(tempForm);

// Submit the form
tempForm.submit();

// Remove the form
document.body.removeChild(tempForm);

And if you're using jQuery you can simplify the above code..

$('<form>', {
    action: 'sheet.php',
    method: 'POST',
    target: '_blank',
    html: $('<input>', {
        name: 'mnu',
        value: JSON.stringify(student)
    }).prop('outerHTML')
}).appendTo($('body')).submit().remove();

Answer 2

Change http.send('mnu='+JSON.stringify(student)); to http.send(JSON.stringify(student));

And then in your sheet.php use json_decode($_POST) to fetch your POST data