How to get parameter from URL using javascript

Question

I passed a parameter through an URL using javascript. Here's the code:

<script> 
window.onload = function() {
// Creating a cookie after the document is ready 
    var cookies = document.cookie.split(";")
    var cookiePair = cookies[0].split("=");
    var cookie_user=cookiePair[1]; // remove ending parenthesis here 

 window.location.replace("http://192.168.206.1/foodblog/?page=http://192.168.206.1/test/ChangeInfo.php&username="+cookie_user);
};
</script>

The page that received the parameter is called ChangeInfo This is what I see in the URL when I get to the ChangeInfo page: http://192.168.206.1/foodblog/?page=http://192.168.206.1/test/ChangeInfo.php&username=nitzan

When I'm trying to get the parameter username from the URL, I get this error: Notice: Undefined index: username in C:\xampp\htdocs\test\ChangeInfo.php on line 5

The way I'm trying to get this parameter is to use $_GET like that: $username = $_GET['username'];

Does anyone know why this makes me a problem? Thanks in advance

you should put the **PHP** code for solving your question , not javascript's . and the error is for that there is no index **5** in array username. — TheFaultInOurStars, Jun 17 '20 at 10:35
my php code in the ChangeInfo page is : $username = $_GET['username']; I wanted to get the value of username parameter from the URL i created on the javascript part — Dean, Jun 17 '20 at 10:37
Does this answer your question? [How to get the value from the GET parameters?](https://stackoverflow.com/questions/979975/how-to-get-the-value-from-the-get-parameters) — Pawel Veselov, Jun 17 '20 at 14:54

score 1 · Answer 1 · answered Jun 17 '20 at 11:04

I just solve the problem

I deleted the Page parameter from the URL I created in javascript part. this is the updated Javascript part:

<script> 
window.onload = function() {
// Creating a cookie after the document is ready 
    var cookies = document.cookie.split(";")
    var cookiePair = cookies[0].split("=");
    var cookie_user=cookiePair[1]; // remove ending parenthesis here 

 window.location.replace("http://192.168.206.1/test/ChangeInfo.php?username="+cookie_user);
};
</script>

thank you :)

score 0 · Answer 2 · answered Jun 17 '20 at 10:44

Ignoring the javascript part, needing to focus on PHP.

You are on this page: http://192.168.206.1/foodblog/?page=http://192.168.206.1/test/ChangeInfo.php&username=nitzan

And when you use $_GET['username'] you get the error, that it is not assigned. It seems that your $_GET is not working at all, probably Apache settings.

Also, it is safer to get GET parameters with isset first.

if(isset($_GET['username']) && $_GET['username']] {
  $username = $_GET['username'];
}
else {
  $username = '';
}

Then you can compare, if username is set or not in your php code:

if($username) {
  //Do something
}

Final thought. Is your first parameter page=http://192.168.206.1/test/ChangeInfo.php working? Can you get it through $_GET?

The problem seems to be just in the way you set and get the url parameter though $_GET. If you use some framework, it might be disabled to use $_GET directly and for example in Symfony you need to use:

$request->get('username');

I think you haven't understood OPs question fully. Their problem is that they don't receive the value of `$_GET['username']` — B001ᛦ, Jun 17 '20 at 10:49
no the $_GET for page parameter is not working either . maybe the problem is the way I created the URL in the javascript part? — Dean, Jun 17 '20 at 10:57

How to get parameter from URL using javascript

2 Answers2