event.currentTarget is undefined after emulating click on element with jQuery .click()

user_7158959 0
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I am using tabs from w3, in one of the tabs I have PHP script that reloads the page, after that I need to activate that same tab and set the class on it.

In example below that line is:

evt.currentTarget.className += " w3-red";

I can activate that tab (IN example:Tokyo) by running:

$("#tab-bilj").click();

But I am getting evt.currentTarget error when setting the class.

How can I emulate that click so it will emulate currentTarget also?

I tired to simply add class with click and would ignore the error, but it wont work.

$("#tab-bilj").click().addClass("w3-red");

EDIT:

i know setting timeout on adding class would do the trick.

setTimeout(function() {
$("#tab-bilj").addClass("w3-red");
      }, 600);

But I would like to fix it thru presented function with currentTarget because i have modified that script to my needs and among other things using cockles etc as well clearing console error. Also to learn how...

function openCity(evt, cityName) {
  var i, x, tablinks;
  x = document.getElementsByClassName("city");
  for (i = 0; i < x.length; i++) {
    x[i].style.display = "none";
  }
  tablinks = document.getElementsByClassName("tablink");
  for (i = 0; i < x.length; i++) {
    tablinks[i].className = tablinks[i].className.replace(" w3-red", "");
  }
  document.getElementById(cityName).style.display = "block";
  evt.currentTarget.className += " w3-red";
}

$(document).ready(function() {
  $("#tab-bilj").click();
});
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.w3-text-amber,.w3-hover-text-amber:hover{color:#ffc107!important}
.w3-text-aqua,.w3-hover-text-aqua:hover{color:#00ffff!important}
.w3-text-blue,.w3-hover-text-blue:hover{color:#2196F3!important}
.w3-text-light-blue,.w3-hover-text-light-blue:hover{color:#87CEEB!important}
.w3-text-brown,.w3-hover-text-brown:hover{color:#795548!important}
.w3-text-cyan,.w3-hover-text-cyan:hover{color:#00bcd4!important}
.w3-text-blue-grey,.w3-hover-text-blue-grey:hover,.w3-text-blue-gray,.w3-hover-text-blue-gray:hover{color:#607d8b!important}
.w3-text-green,.w3-hover-text-green:hover{color:#4CAF50!important}
.w3-text-light-green,.w3-hover-text-light-green:hover{color:#8bc34a!important}
.w3-text-indigo,.w3-hover-text-indigo:hover{color:#3f51b5!important}
.w3-text-khaki,.w3-hover-text-khaki:hover{color:#b4aa50!important}
.w3-text-lime,.w3-hover-text-lime:hover{color:#cddc39!important}
.w3-text-orange,.w3-hover-text-orange:hover{color:#ff9800!important}
.w3-text-deep-orange,.w3-hover-text-deep-orange:hover{color:#ff5722!important}
.w3-text-pink,.w3-hover-text-pink:hover{color:#e91e63!important}
.w3-text-purple,.w3-hover-text-purple:hover{color:#9c27b0!important}
.w3-text-deep-purple,.w3-hover-text-deep-purple:hover{color:#673ab7!important}
.w3-text-red,.w3-hover-text-red:hover{color:#f44336!important}
.w3-text-sand,.w3-hover-text-sand:hover{color:#fdf5e6!important}
.w3-text-teal,.w3-hover-text-teal:hover{color:#009688!important}
.w3-text-yellow,.w3-hover-text-yellow:hover{color:#d2be0e!important}
.w3-text-white,.w3-hover-text-white:hover{color:#fff!important}
.w3-text-black,.w3-hover-text-black:hover{color:#000!important}
.w3-text-grey,.w3-hover-text-grey:hover,.w3-text-gray,.w3-hover-text-gray:hover{color:#757575!important}
.w3-text-light-grey,.w3-hover-text-light-grey:hover,.w3-text-light-gray,.w3-hover-text-light-gray:hover{color:#f1f1f1!important}
.w3-text-dark-grey,.w3-hover-text-dark-grey:hover,.w3-text-dark-gray,.w3-hover-text-dark-gray:hover{color:#3a3a3a!important}
.w3-border-amber,.w3-hover-border-amber:hover{border-color:#ffc107!important}
.w3-border-aqua,.w3-hover-border-aqua:hover{border-color:#00ffff!important}
.w3-border-blue,.w3-hover-border-blue:hover{border-color:#2196F3!important}
.w3-border-light-blue,.w3-hover-border-light-blue:hover{border-color:#87CEEB!important}
.w3-border-brown,.w3-hover-border-brown:hover{border-color:#795548!important}
.w3-border-cyan,.w3-hover-border-cyan:hover{border-color:#00bcd4!important}
.w3-border-blue-grey,.w3-hover-border-blue-grey:hover,.w3-border-blue-gray,.w3-hover-border-blue-gray:hover{border-color:#607d8b!important}
.w3-border-green,.w3-hover-border-green:hover{border-color:#4CAF50!important}
.w3-border-light-green,.w3-hover-border-light-green:hover{border-color:#8bc34a!important}
.w3-border-indigo,.w3-hover-border-indigo:hover{border-color:#3f51b5!important}
.w3-border-khaki,.w3-hover-border-khaki:hover{border-color:#f0e68c!important}
.w3-border-lime,.w3-hover-border-lime:hover{border-color:#cddc39!important}
.w3-border-orange,.w3-hover-border-orange:hover{border-color:#ff9800!important}
.w3-border-deep-orange,.w3-hover-border-deep-orange:hover{border-color:#ff5722!important}
.w3-border-pink,.w3-hover-border-pink:hover{border-color:#e91e63!important}
.w3-border-purple,.w3-hover-border-purple:hover{border-color:#9c27b0!important}
.w3-border-deep-purple,.w3-hover-border-deep-purple:hover{border-color:#673ab7!important}
.w3-border-red,.w3-hover-border-red:hover{border-color:#f44336!important}
.w3-border-sand,.w3-hover-border-sand:hover{border-color:#fdf5e6!important}
.w3-border-teal,.w3-hover-border-teal:hover{border-color:#009688!important}
.w3-border-yellow,.w3-hover-border-yellow:hover{border-color:#ffeb3b!important}
.w3-border-white,.w3-hover-border-white:hover{border-color:#fff!important}
.w3-border-black,.w3-hover-border-black:hover{border-color:#000!important}
.w3-border-grey,.w3-hover-border-grey:hover,.w3-border-gray,.w3-hover-border-gray:hover{border-color:#9e9e9e!important}
.w3-border-light-grey,.w3-hover-border-light-grey:hover,.w3-border-light-gray,.w3-hover-border-light-gray:hover{border-color:#f1f1f1!important}
.w3-border-dark-grey,.w3-hover-border-dark-grey:hover,.w3-border-dark-gray,.w3-hover-border-dark-gray:hover{border-color:#616161!important}
.w3-border-pale-red,.w3-hover-border-pale-red:hover{border-color:#ffe7e7!important}.w3-border-pale-green,.w3-hover-border-pale-green:hover{border-color:#e7ffe7!important}
.w3-border-pale-yellow,.w3-hover-border-pale-yellow:hover{border-color:#ffffcc!important}.w3-border-pale-blue,.w3-hover-border-pale-blue:hover{border-color:#e7ffff!important}
<script src="https://cdnjs.cloudflare.com/ajax/libs/jquery/3.3.1/jquery.min.js"></script>
<!DOCTYPE html>
<html>
<title>W3.CSS</title>
<meta name="viewport" content="width=device-width, initial-scale=1">
<link rel="stylesheet" href="https://www.w3schools.com/w3css/4/w3.css">
<body>

  <div class="w3-bar w3-black">
    <button class="w3-bar-item w3-button tablink w3-red" onclick="openCity(event,'London')">London</button>
    <button class="w3-bar-item w3-button tablink" onclick="openCity(event,'Paris')">Paris</button>
    <button id="tab-bilj" class="w3-bar-item w3-button tablink" onclick="openCity(event,'Tokyo')">Tokyo</button>
  </div>
  
  <div id="London" class="w3-container w3-border city">
    <h2>London</h2>
    <p>London is the capital city of England.</p>
  </div>

  <div id="Paris" class="w3-container w3-border city" style="display:none">
    <h2>Paris</h2>
    <p>Paris is the capital of France.</p> 
  </div>

  <div id="Tokyo" class="w3-container w3-border city" style="display:none">
    <h2>Tokyo</h2>
    <p>Tokyo is the capital of Japan.</p>
  </div>
</div>

<script>

</script>

</body>
</html>

properties events jquery javascript
1 Answers

An alternative to what you're trying to do. There's no need to use jQuery in this. If the click event is the only reason you're loading a MASSIVE library, then don't. Below will work on Most browsers.

Change your buttons as follows:

<div class="w3-bar w3-black">
    <button class="w3-bar-item w3-button tablink w3-red" onclick="openCity(this,'London')">London</button>
    <button class="w3-bar-item w3-button tablink" onclick="openCity(this,'Paris')">Paris</button>
    <button id="tab-bilj" class="w3-bar-item w3-button tablink" onclick="openCity(this,'Tokyo')">Tokyo</button>
</div>

Your code can be simplified MUCH more if you use pure JavaScript. Code:

function openCity(target, cityName) {
        document.querySelectorAll(".city").forEach(y => y.style.display = "none");//hides all cities
        document.querySelectorAll('.tablink').forEach(y => y.className.replace("ws-red", ""));
        document.querySelectorAll(".w3-red").forEach(z => z.classList.remove("w3-red"))
        document.querySelector(`#${cityName}`).style.display = "block"
        target.classList.add("w3-red");
    }

Instead of that jQuery, use:

document.onreadystatechange= document.querySelector("#tab-bilj").click();

Now, if you're stuck on using jQuery, then you can do the following:

function openCity(target, cityName) {
    $('.city').css('display', 'none');//will change all
    $('.w3-red').removeClass('w3-red');//removes all instances of this class
    $('#' + cityName).css('display', '');
    $(target).addClass('w3-red');
}

$(document).ready(function () { $("#tab-bilj").click(); });

The above is for if you use the buttons I provided. If you want to use the event as with your original buttons, do this:

function openCity(evt, cityName) {
    $('.city').css('display', 'none');//will change all
    $('.w3-red').removeClass('w3-red');//removes all instances of this class
    $('#' + cityName).css('display', '');
    $(evt.target).addClass('w3-red');
}

The pure JavaScript above will be MUCH faster for you, and it won't rely on an enormous library. Up to you.

Edit: Added a more advanced method If you would rather not show the event name on the buttons, you can add an event listener instead using the following code. No need to pass events or references.

Buttons:

<button class="w3-bar-item w3-button tablink">London</button>
<button class="w3-bar-item w3-button tablink">Paris</button>
<button id="tab-bilj" class="w3-bar-item w3-button tablink">Tokyo</button>

New Code:

function openCity(cityName) {
    document.querySelectorAll(".city").forEach(y => y.style.display ="none");//hides all cities
    document.querySelectorAll('.tablink').forEach(y => y.className.replace("ws-red", ""));
    document.querySelectorAll(".w3-red").forEach(z => z.classList.remove("w3-red"))
    document.querySelector(`#${cityName}`).style.display = "block"  
}
    document.querySelectorAll('.w3-button')
      .forEach(x => x.addEventListener('click', function() {
          openCity(x.innerText);
          x.classList.add("w3-red");        
    }));

document.querySelector("#tab-bilj").click();
user_101417200
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