Posted in javascript
3:13 am, May 14, 2021

set active class based on url value

this will check the full url and then loop through all the a elements in #test-div

when it finds a matching url it will add the class active to that button

this is good for persisting active links on page reload using javascript when you can not access the server side code. 

Preview

HTML

<div id='test-div'>
  <a href='https://kruxor.com/view/code/tiYPZ/&something-else' class='btn btn-primary'>Button 1</a>
  <a href='https://kruxor.com/view/code/tiYPZ/' class='btn btn-primary'>Button 2</a>
  <a href='https://kruxor.com/view/code/tiYPZ/&something' class='btn btn-primary'>Button 3</a>
</div>

CSS

.active {
  background:#F00;
}

Javascript

window.onload = function() {
    var all_links = document.getElementById("test-div").getElementsByTagName("a"),
        i=0, len=all_links.length,
        full_path = location.href.split('#')[0]; //Ignore hashes?

    // Loop through each link.
    for(; i<len; i++) {
        if(all_links[i].href.split("#")[0] == full_path) {
            all_links[i].className += " active";
        }
    }
    if("https://kruxor.com/" == full_path) {
      // set a default current -- sets the 1st item in the list as active.
      all_links[0].className += " active";
    }
}

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