Check for user in JavaScript

Question

I have this piece of code, which checks the address bar for the string ?user=:

if(window.location.href.indexOf("?user=") > -1) {
    start();
} else {
    alert("No user.");
}

But actually I would like to check, if the ?user= has something after it, for example a name. I would be glad if you could help me out.

You could do that (see [How can I get query string values in JavaScript?](http://stackoverflow.com/questions/901115/how-can-i-get-query-string-values-in-javascript)). However, that smells like you're implementing a very bad security system... — bfavaretto, Nov 14 '13 at 20:14
In this case security doesn't matter, however thanks for the tip. — danrodi, Nov 14 '13 at 20:16
`/\?user\=./.test(window.location.search)` checks if any character comes after the equal sign ? — adeneo, Nov 14 '13 at 20:18

score 3 · Accepted Answer · answered Nov 14 '13 at 20:16

3

Use a regular expression match.

if(window.location.href.match(/\?user=[^&]/) {
    start();
} else {
    alert("No user.");
}

answered Nov 14 '13 at 20:16

Barmar

m1. · Answer 2 · 2013-11-15T00:19:29.030

0

You could just use this regular expression:

/user=\w+(&|$)/.test(window.location.search)

edited Nov 15 '13 at 00:19

answered Nov 14 '13 at 20:18

m1.

1

It's not necessary to check for both `\w` and `\d`, since digits are included in `\w`. – Barmar Nov 14 '13 at 20:22

score 0 · Answer 3 · answered Nov 14 '13 at 20:27

0

var user = (window.location.search.match(/user=(\w+)/) || [])[1];

if(user) {
    start();
} else {
    alert('No user.');
}

answered Nov 14 '13 at 20:27

ArrayKnight

3 Answers3