HTML Forms two actions - php

Question

So generally I have a form whose action is a link that verifies the user's username and password (can't post the link does not belong to me) and if it's correct it gives me an "ok" or else a "no"
How can I make it in a way that if yes it directs me to my index page and if no gives an error or reloads the page or something. Is their a way to do that
the general html appearance is:
<form method="post" action="https://***************/login">
<label for="book">Username:</label>
<input type="text" name="username" id="username" placeholder="Enter username">
<label for="course">Password:</label>
<input type="password" name="password" id="password" placeholder="Enter password">
<input type="submit" value="Log in">
</form>
so if I were to change it into the way I want it then the action should change into something like verify.php which would have the appearance of
<?php
# how do I use an if for a link using the info that was input
if($_POST["https://***************/login"]){
#load index.html
?>
<script type="text/javascript">
window.location.href = 'index.html';
</script>
<?php
else{
#load the page again
?>
<script type="text/javascript">
window.location.href = 'login.php';
</script>
<?php
}
?>
I'm a bit new to php.
So please help

Answer 1

There is a header to redirect, you have to put it in your php script :
header('Location: yoururl.com');
To record error from your script, you can set it in $_SESSION variables :
session_start(); // at the beginning of your script
$_SESSION['error'] = 'Password incorrect, please try again';
And so, in your other page, you can use something like :
if($_SESSION['error']) {
echo $_SESSION['error']; // display error
$_SESSION['error'] = ''; // delete it
}

Answer 2

Being unable to edit the login verification file, I think your best option is to submit the form via ajax and handle its response with javascript, having your form like
<form method="post" action="" onsubmit="return false;">
<label for="book">Username:</label>
<input type="text" name="username" id="username" placeholder="Enter username">
<label for="course">Password:</label>
<input type="password" name="password" id="password" placeholder="Enter password">
<input type="submit" value="Log in" onclick="btnAuthenticateUser();">
</form>
then, in plain javascript something like
<script type="text/javascript">
var xmlHttp;
function GetXmlHttpObject() {
var xmlHttp = null;
try {
xmlHttp = new XMLHttpRequest();
}
catch (e) {
try {
xmlHttp = new ActiveXObject("Msxml2.XMLHTTP");
}
catch (e) {
xmlHttp = new ActiveXObject("Microsoft.XMLHTTP");
}
}
return xmlHttp;
}
function btnAuthenticateUser() {
try {
var username = document.getElementById('username');
var pwd = document.getElementById('password');
xmlHttp = GetXmlHttpObject();
if (xmlHttp == null) {
alert("Your browser does not support AJAX!");
return;
}
var url = 'https://***************/login?username=' + username.value + '&password=' + pwd.value;
xmlHttp.onreadystatechange = function () {
if (xmlHttp.readyState == 4) {
if (xmlHttp.status == 200) {
if (xmlHttp.responseText == "ok") {
window.location = "index.html";
} else {
location.reload();
}
}
if (xmlHttp.readyState == 4) {
// LoadingPage
}
}
}
xmlHttp.open("POST", url, true);
xmlHttp.send(null);
if (xmlHttp.readyState == 1) {
//LoadingPage
}
} catch (e) {
alert(e.Message);
}
}
</script>
or if you're using jQuery
function btnAuthenticateUser() {
$.ajax({
async: true,
type: 'POST',
url: 'https://***************/login',
data: { username: $('#username').val(), password: $('#password').val()}
})
.done(function (data) {
if (data == "ok") {
window.location = "index.html";
}else{
location.reload();
}
})
.fail(function (jqxhr, textStatus, error) {
GriterError(Global.FailTryAgain);
});
}

Answer 3

You can perform the action you need on your verification script and then throw in a redirect using the headers in PHP.
After the verification action you can choose which page to go to through an if/then statement
for example:
if ([the action you wanted succeeded]) {
header('Location: index.php');
}
else {
header('Location: login.php');
}