Create Tabs - Show a Tab by Default - Not Working

[tomriddle22]

Hello,

I am using the How to Create Tabs tutorial (https://www.w3schools.com/howto/howto_js_tabs.asp), but I can't get the default tab to work. It seems to work in the Tryit Editor, but even pasting the code as is, it doesn't work. 

I am using Shopify and have a .js, .css, and a .liquid (page template) document.

Other changes on the pages seem to take affect. 

 

{{ 'tabs.js' | asset_url | script_tag }}
{{ 'tabs.css' | asset_url | stylesheet_tag }}

{% include 'breadcrumb' %}
<meta name="viewport" content="width=device-width, initial-scale=1">

<div class="grid">

  <div class="grid-item large--two-thirds push--large--one-sixth">

    <h1>{{ page.title }}</h1>

    <div class="rte">
      
 

      <h2>Tabs</h2>
<p>Click on the x button in the top right corner to close the current tab:</p>

<div class="tab">
  <button class="tablinks" onclick="openCity(event, 'London')" id="defaultOpen">London</button>
  <button class="tablinks" onclick="openCity(event, 'Paris')">Paris</button>
  <button class="tablinks" onclick="openCity(event, 'Tokyo')">Tokyo</button>
</div>

<div id="London" class="tabcontent">
  <span onclick="this.parentElement.style.display='none'" class="topright">&times</span>
  <h3>London</h3>
  <p>London is the capital city of England.</p>
</div>

<div id="Paris" class="tabcontent">
  <span onclick="this.parentElement.style.display='none'" class="topright">&times</span>
  <h3>Paris</h3>
  <p>Paris is the capital of France.</p> 
</div>

<div id="Tokyo" class="tabcontent">
  <span onclick="this.parentElement.style.display='none'" class="topright">&times</span>
  <h3>Tokyo</h3>
  <p>Tokyo is the capital of Japan.</p>
</div>
      
      
      
      
      {{ page.content }}
      
      
    </div>

  </div>

</div>

function openCity(evt, cityName) {
  var i, tabcontent, tablinks;
  tabcontent = document.getElementsByClassName("tabcontent");
  for (i = 0; i < tabcontent.length; i++) {
    tabcontent[i].style.display = "none";
  }
  tablinks = document.getElementsByClassName("tablinks");
  for (i = 0; i < tablinks.length; i++) {
    tablinks[i].className = tablinks[i].className.replace(" active", "");
  }
  document.getElementById(cityName).style.display = "block";
  evt.currentTarget.className += " active";
}

// Get the element with id="defaultOpen" and click on it
document.getElementById("defaultOpen").click();

/* Change background color of buttons on hover */
.tab button:hover {
  background-color: #ddd;
}

/* Create an active/current tablink class */
.tab button.active {
  background-color: #ccc;
}

/* Style the tab content */
.tabcontent {
  display: none;
  padding: 6px 12px;
  border: 1px solid #ccc;
  border-top: none;
}

/* Style the close button */
.topright {
  float: right;
  cursor: pointer;
  font-size: 28px;
}

.topright:hover {color: red;}

 

[Funce]

Your Javascript may be running too early, before the page is loaded.

Try an onload event handler. 

Use AddEventListener in your code like as follows.

window.addEventListener('load', function (e) {
  //Run the code here
});

Disclaimer: Untested, so may require tweaking.

[dsonesuk]

Either  place js link just before body closing tag OR just the code that calls click() event, OR place click() code in window onload function as suggested.