Run 'if url contains' conditional function without page refresh

I have a single page app where part of the url changes but the page does not refresh.

I have a simple function that needs to run, only when 'foo' appaers in the URL.

This obviously does not work because it only runs the first time the page loads, and 'foo' may not be there yet.

if (window.location.href.indexOf("foo") > -1) {

Is there a way I can detect a URL change in order to run my function? Or a better way? The URLs in question do not contain a hash, so hashchange isn't working.


You could use a while loop that runs till it finds what you need like this:

var found =false;
while(found == false){

    if (window.location.href.indexOf("foo") > -1) {
        found = true;
        //more code 


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