How to check if the URL contains a given string?

You need add href property and check indexOf instead of contains

<script src="https://cdnjs.cloudflare.com/ajax/libs/jquery/3.3.1/jquery.min.js"></script>
<script type="text/javascript">
  $(document).ready(function() {
    if (window.location.href.indexOf("franky") > -1) {
      alert("your url contains the name franky");
    }
  });
</script>

if (window.location.href.indexOf("franky") != -1)

would do it. Alternatively, you could use a regexp:

if (/franky/.test(window.location.href))

You would use indexOf like this:

if(window.location.href.indexOf("franky") != -1){....}

Also notice the addition of href for the string otherwise you would do:

if(window.location.toString().indexOf("franky") != -1){....}

like so:

    <script type="text/javascript">
        $(document).ready(function () {
            if(window.location.href.indexOf("cart") > -1) 
            {
                 alert("your url contains the name franky");
            }
        });
    </script>

The regex way:

var matches = !!location.href.match(/franky/); //a boolean value now

Or in a simple statement you could use:

if (location.href.match(/franky/)) {

I use this to test whether the website is running locally or on a server:

location.href.match(/(192.168|localhost).*:1337/)

This checks whether the href contains either 192.168 or localhost AND is followed by :1337.

As you can see, using regex has its advantages over the other solutions when the condition gets a bit trickier.

document.URL should get you the URL and

if(document.URL.indexOf("searchtext") != -1) {
    //found
} else {
    //nope
} 

Try this, it's shorter and works exactly as window.location.href:

if (document.URL.indexOf("franky") > -1) { ... }

also if you want to check the previous URL:

if (document.referrer.indexOf("franky") > -1) { ... }

Easier it gets

<script type="text/javascript">
$(document).ready(function () {
    var url = window.location.href;
    if(url.includes('franky'))    //includes() method determines whether a string contains specified string.
    {
         alert("url contains franky");
    }
});
</script>

Try indexOf

if (foo.indexOf("franky") >= 0)
{
  ...
}

You can also try search (for regular expressions)

if (foo.search("franky") >= 0)
{
  ...
}

I like to create a boolean and then use that in a logical if.

//kick unvalidated users to the login page
var onLoginPage = (window.location.href.indexOf("login") > -1);

if (!onLoginPage) {
  console.log('redirected to login page');
  window.location = "/login";
} else {
  console.log('already on the login page');
}

Put in your js file

                var url = window.location.href;
                console.log(url);
                console.log(~url.indexOf("#product-consulation"));
                if (~url.indexOf("#product-consulation")) {
                    console.log('YES');
                    // $('html, body').animate({
                    //     scrollTop: $('#header').offset().top - 80
                    // }, 1000);
                } else {
                    console.log('NOPE');
                }

window.location isn't a String, but it has a toString() method. So you can do it like this:

(''+window.location).includes("franky")

or

window.location.toString().includes("franky")

From the old Mozilla docs:

Location objects have a toString method returning the current URL. You can also assign a string to window.location. This means that you can work with window.location as if it were a string in most cases. Sometimes, for example when you need to call a String method on it, you have to explicitly call toString.

Try this:

<script type="text/javascript">             
    $(document).ready
    (
        function () 
        { 
            var regExp = /franky/g;
            var testString = "something.com/frankyssssddsdfjsdflk?franky";//Inyour case it would be window.location;
            if(regExp.test(testString)) // This doesn't work, any suggestions.                 
            {                      
                alert("your url contains the name franky");                 
            }             
        }
    );         
</script> 

Use Window.location.href to take the url in javascript. it's a property that will tell you the current URL location of the browser. Setting the property to something different will redirect the page.

if (window.location.href.indexOf('franky') > -1) {
     alert("your url contains the name franky");
}

Regular Expressions will be more optimal for a lot of people because of word boundaries \b or similar devices. Word boundaries occur when any of 0-9, a-z, A-Z, _ are on that side of the next match, or when an alphanumeric character connects to line or string end or beginning.

if (location.href.match(/(?:\b|_)franky(?:\b|_)))

If you use if(window.location.href.indexOf("sam"), you'll get matches for flotsam and same, among other words. tom would match tomato and tomorrow, without regex.

Making it case-sensitive is as simple as removing the i.

Further, adding other filters is as easy as

if (location.href.match(/(?:\b|_)(?:franky|bob|billy|john|steve)(?:\b|_)/i))

Let's talk about (?:\b|_). RegEx typically defines _ as a word character so it doesn't cause a word boundary. We use this (?:\b|_) to deal with this. To see if it either finds \b or _ on either side of the string.

Other languages may need to use something like

if (location.href.match(/([^\wxxx]|^)(?:franky|bob|billy|john|steve)([^\wxxx]|$)/i))
//where xxx is a character representation (range or literal) of your language's alphanumeric characters.

All of this is easier than saying

var x = location.href // just used to shorten the code
x.indexOf("-sam-") || x.indexOf("-sam.") || x.indexOf(" sam,") || x.indexOf("/sam")...
// and other comparisons to see if the url ends with it 
// more for other filters like frank and billy

^{Other languages' flavors of Regular Expressions support \p{L} but javascript does not, which would make the task of detecting foreign characters much easier. Something like [^\p{L}](filters|in|any|alphabet)[^\p{L}]}

Suppose you have this script

<div>
  <p id="response"><p>
  <script>
    var query = document.location.href.substring(document.location.href.indexOf("?") + 1);
    var text_input = query.split("&")[0].split("=")[1];
    document.getElementById('response').innerHTML=text_input;
  </script> </div>

And the url form is www.localhost.com/web_form_response.html?text_input=stack&over=flow

The text written to <p id="response"> will be stack

It will be a good practice if you convert your string to lower or uppercase as indexof() method is case sensitive. This will be if your search isn't case sensitive mind full So for a search which is not case sensitive mindful it will be:

var string= location.href;
var convertedString= string.toLowerCase();
 if(convertedString.indexOf(franky) != -1){
  alert("url has franky");
}
else{
 alert("url has no franky");
 }