我使用XMLHttpRequest成功验证表单后如何使用移动到另一个页面，因为Header函数不能与ajax一起使用

Question

Javascript:

var xhttp = new XMLHttpRequest();

xhttp.onreadystatechange = function(){
    if(xhttp.readyState==4 && xhttp.status==200){
        document.getElementById("display_result").innerHTML=xhttp.responseText;
    }
};
document.getElementById('loading').style.display='block';
xhttp.open("POST", "users_process.php", true);

xhttp.setRequestHeader('X-Alt-Referer', 'dashboard.php');
xhttp.send(data);

PHP:

<?php
    $execute_query=$data_access->Execute($query);
    if($execute_query==true){
        header("location: dashboard.php");
    }else{
        echo("<div id='error'>Some error occured during uploading Please try again</div>");
    }
?>

Answer 1

XMLHttpRequest returns a DOMString that contains the response to the request as text, or null if the request was unsuccessful or has not yet been sent.

So when you redirect on the serverside, you don't redirect on the client side; the request just returns whatever is echoed on the server side as response. What you can do is return a value (a string or a boolean) assuring that the query was OK. Then, on the client side, you can check for that value and perform a redirect using window.location.href.