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How to add a class to wordpress buttons

I want to add a class to the download button of all the posts of my wordpress site, but without having to do it in each post
I have umami software running, where I track my traffic, I would like to add events every time someone presses the download button
For that event to be registered, I must add the class "umami--click--download-button" to each button.
I have already tried in many ways but nothing seems to work
the last thing i did was add the following script but it doesn't work either
<script>
$( "div" ).addClass(function( index, currentClass ) {
var addedClass;
if ( currentClass === "wp-block-button" ) {
addedClass = "umami--click--download-button";
}
return addedClass;
});
</script>
In the element inspector the button appears as follows
<div class="wp-block-button has-custom-font-size has-large-font-size">
<a class="wp-block-button__link has-white-color
has-vivid-cyan-blue-to-vivid-purple-gradient-background
has-text-color has-background wp-element-button" href="https://earnlink.click/"
style="border-radius:10px" target="_blank"
rel="noreferrer noopener">DOWNLOAD</a></div>
Thank you very much in advance to whoever answers

Here is the correct code. Try this and let me know if it works fine or not. If you see any error in console please provide the error message for debugging
<script>
(function ($) {
$('div.wp-block-button .wp-block-button__link').each(function () {
const classToAdd = 'umami--click--download-button';
const button = $(this);
if (!button.hasClass(classToAdd)) {
button.addClass(classToAdd);
}
});
})(jQuery);
</script>

you need to test the entire class list. see example below. This will add the class to the <div> tag not the <a> tag.
$("div").addClass(function(index, currentClass) {
var addedClass;
if (currentClass === "wp-block-button has-custom-font-size has-large-font-size") {
addedClass = "umami--click--download-button";
}
return addedClass;
});
.umami--click--download-button {
color: red;
}
<script src="https://code.jquery.com/jquery-3.5.0.js"></script>
<div class="wp-block-button has-custom-font-size has-large-font-size">this is a test
<a class="wp-block-button__link has-white-color
has-vivid-cyan-blue-to-vivid-purple-gradient-background
has-text-color has-background wp-element-button" href="https://earnlink.click/" style="border-radius:10px" target="_blank" rel="noreferrer noopener">DOWNLOAD</a></div>
<div class="wp-block-button has-custom-font-size has-large-font-size">this is a test another test</div>
<div class="wp-block-button ">and another</div>

angular show and hide function

I have created a show and function using Angular. At the moment i have the basics working. When the user hovers over tile the class is added and removed.
<article class="col-sm-6" ng-mouseenter="showHiddenTile()" ng-mouseleave="hideHiddenTile()">
<div class="grid-block--img">
<img src="/assets/homepage/home-tile5.png">
<div class="grid-headings">
<h2>a new<br/>home for<br/>whiskey</h2>
<p><span class="heading--bold">WORK.</b><span> Food and Beverage Design<
</div>
<div class="grid-block-hidden" ng-class="{isVisble: tileBlock}">My overlay</div>
</div>
</article>
I want to use this show and hide function multiple times throughout the site. At the moment when I hover over one of the elements it adds the isActive class to all elements instead of individually.
Angular code
// SHOW AND HIDE FUNCTION
$scope.showHiddenTile = function() {
$scope.tileBlock = true;
}
$scope.hideHiddenTile = function() {
$scope.tileBlock = false;
}
How can I target the isVisble class individually?

Have an array
$scope.array = [];
push it to array when mouseenter event
function showMethod(element){
$scope.array.push(element);
}
slice it from array when mouseleave event
function hideMethod(element){
$scope.array.slice($scope.array.indexOf(element),1);
}
use this condition in ng-class
ng-class="array['blockName'] != -1"

You could do something like:
<article class="col-sm-6" ng-mouseenter="showHiddenTile('block-id')" ng-mouseleave="hideHiddenTile('block-id')">
And:
$scope.showHiddenTile = function(blockId) {
$scope.tileBlock[blockId] = true;
}
$scope.hideHiddenTile = function(blockId) {
$scope.tileBlock[blockId] = false;
}
$scope.isShowTitle = function(blockId) {
return $scope.tileBlock[blockId];
}
And:
<div class="grid-block-hidden" ng-class="{isVisble: isShowTitle('block-id'}">My overlay</div>
And then have a unique block-id per article.

why not have 2 styles
.grid-block-hidden{
//style when mouse is not on
}
grid-block-hidden:hover{
//style on hover
//isVisble class
}

Javascript click button function under certain div

This is the code of a button in one html page
<a class="btn" role="button" href="#">Click me</a>
I have this javascript code to click a button with a certain class
var clickBtn = document.getElementsByClassName('btn');
for(var i=0;i<clickBtn.length;i++)
{
clickBtn[i].click();
}
This code clicks every button with the class "btn" in ALL the page.
But there are some other buttons in the same page with the same class.
So i want my javascript code to be modifided to click
only a certain button in a certain div.
The code with the div is
<div class="inside">
<span>
<a class="btn" role="button" href="#">Click me</a>
</span>
</div>
Any idea of how can i modify my javascript code to click only the button inside that div??
Thanks for your time.

You can use querySelectorAll()
Array.from(document.querySelectorAll('.inside .btn')).forEach(btn => {
alert(btn.innerHTML)
btn.click();
});
Or without es6:
[].slice.call(document.querySelectorAll('.inside .btn')).forEach(function(btn) {
alert(btn.innerHTML)
btn.click();
});
DEMO
Updated for your comment (Can you update your code that if there is an id in the span like not to click the button?):
[].slice.call(document.querySelectorAll('.inside .btn')).forEach(function(btn) {
if (btn.parentNode.id != 'clicked') {
alert(btn.innerHTML);
btn.click();
}
});
or you can use querySelectorAll() with a :not condition to avoid the if check:
Array.from(document.querySelectorAll('.inside span:not([id="clicked"]) .btn'))
.forEach(btn => {
alert(btn.innerHTML)
btn.click();
});

If you want a non-jQuery solution, you can use getElementById to get the div, and then getElementsByClassName to get all the buttons within that div.
var insideDiv = document.getElementById("inside");
var buttonsInsideDiv = insideDiv.getElementsByClassName();

var parentDiv = clickBtn[i].parentNode;
var clickBtn = document.getElementsByClassName('btn');
for(var i=0;i<clickBtn.length;i++)
{
var parentDiv = clickBtn[i].parentNode;
if(parentDiv == yourDiv)
{
clickBtn[i].click();
}
}
I am not sure, var parentDiv = clickBtn[i].parentNode will work. But the idea is the same.

Open Expanding List from Href

I'm trying to modify this pen I found on CodePen. I'd like to be able to open a specific list on the page from another page. Clicking the link should open the corresponding section on the next page on page load.
I'm a bit of a newbie when it comes to jQuery, so I appreciate any help I can get. I've tried searching around and have an idea of what I need to target, but I haven't been able to make it happen. Here is my code:
HTML:
<!--Link on Previous Page-->
Click Here
<!--Target List-->
<div class="integration-list">
<ul>
<li class="integration">
<a class="expand" id="list">
<div class="expand_intro"><h3 class="teal_bold">Click Here</h3></div>
<div class="right-arrow">▼</div>
</a>
<div class="detail">
<div><p>Lorem Ipsum Dolor...</p></div>
</div>
</li>
</ul>
</div>
JS:
$(function() {
$(".expand").on( "click", function() {
$(this).next().slideToggle(100);
$expand = $(this).find(">:nth-child(2)");
if($expand.text() == "▼") {
$expand.text("▲");
} else {
$expand.text("▼");
}
var hash = window.location.hash;
var thash = hash.substring(hash.lastIndexOf('#'), hash.length);
$('.expand').find('a[href*='+ thash + ']').trigger('click');
});
});

Few things that I did to get it to work:
The trigger event is probably firing before the handler is actually attached. You can use setTimeout as a way around this.
Also, even with setTimeout around $('.expand').find('a[href*='+ thash + ']').trigger('click'); it didn't work for me. I changed that to simply $(thash).click();.
The complete code of the "expand.js" file:
$(function() {
var hash = window.location.hash;
var thash = hash.substring(hash.lastIndexOf('#'), hash.length);
setTimeout(function() {
$(thash).click();
}, 10);
$(".expand").on( "click", function() {
$(this).next().slideToggle(100);
$expand = $(this).find(">:nth-child(2)");
if($expand.text() == "â–¼") { //If you copy/paste, make sure to fix these arrows
$expand.text("â–²");
} else {
$expand.text("â–¼");
}
});
});
Apparently the arrows don't display properly here, so watch that if you copy/paste this.

When one is clicked, disable the other

So I have a mini slide menu in my website there is a menu you can choose what you want to read. There are points to click, when u clicked it the point get a red background.
But there is a problem.
When i click one point and then an other point the first clicked point have to lose his background.
Here is my HTML:
<div id="slide_button" onClick="clicked(this);"><dir class="button_1"></dir></div>
<div id="slide_button" onClick="clicked(this);"><dir class="button_2"></dir></div>
<div id="slide_button" onClick="clicked(this);"><dir class="button_3"></dir></div>
<div id="slide_button" onClick="clicked(this);"><dir class="button_4"></dir></div>
<div id="slide_button" onClick="clicked(this);"><dir class="button_5"></dir></div>
Here is my JS:
function clicked(slide_button) {
slide_button.getElementsByTagName("dir")[0].style.backgroundColor="red";
}
HERE IS AN EXAMPLE ON FIDDLE.
My "QUESTION IS" what i have to do to solve that?
What should I pay attention?

First you need to fix your HTML becaue your id values aren't unique. In fact, you don't even need id values, so you should use "slide_button" as a class. You can then use it to select all the buttons:
<div onClick="clicked(this);" class="slide_button"><dir></dir></div>
<div onClick="clicked(this);" class="slide_button"><dir></dir></div>
<div onClick="clicked(this);" class="slide_button"><dir></dir></div>
<div onClick="clicked(this);" class="slide_button"><dir></dir></div>
<div onClick="clicked(this);" class="slide_button"><dir></dir></div>
The CSS needs to be changed now so "slide_button" is a class selector, instead of an id selector:
.slide_button {
display: inline-block;
}
As for clearing the background, clear all of them before coloring the selected one red:
function clicked(slide_button) {
var buttons = document.getElementsByClassName('slide_button');
for(var i = 0; i < buttons.length; i++) {
buttons[i].getElementsByTagName('dir')[0].style.backgroundColor = '';
}
slide_button.getElementsByTagName('dir')[0].style.backgroundColor = 'red';
}
jsfiddle
This uses just JavaScript with no JQuery, but if you are using JQuery, you might as well use it here. The code is a lot shorter and easier to follow.
Here's a JQuery version:
$(function() {
$('.slide_button').click(function() {
var $button = $(this);
$button.children(':first').css({ backgroundColor: 'red' });
$button.siblings().children(':first').css({ backgroundColor: '' });
});
});
Note: This registers a click-handler, so you can get rid of the "onclick" attirbutes.
jsfiddle

You have to select all other points and set their background to none.
Or remeber which point is selected and on select another just remove background on last and remeber current point, then set its background to red.
See fiddle: http://fiddle.jshell.net/399Dm/5/

At first id should be unique per element.
<div class="slide_button"><dir class="button"></dir></div>
<div class="slide_button"><dir class="button"></dir></div>
<div class="slide_button"><dir class="button"></dir></div>
<div class="slide_button"><dir class="button"></dir></div>
<div class="slide_button"><dir class="button"></dir></div>
Second, you should store reference of clicked element if you want later remove background color, and instead of inline event handlers or binding all elements would be better if you use event delegation.
Demonstration
(function () {
"use strict";
// getting parent node of divs, due to bind click event. then
var ele = document.querySelector(".slide_button").parentNode,
prev = null; // store previous clicked element
ele.addEventListener("click", clickHandler); // event handler.
function clickHandler(e) {
var t = e.target; // get target of clicked element
// filter by target node name and class. edit: removed class checking
if (t.nodeName.toLowerCase() === "dir") {
// checking value of prev !== null and it's not same element.
if (prev && prev !== t) {
prev.style.backgroundColor = "";
}
prev = t; // store clicked element
t.style.backgroundColor = "red";
}
}
}());

I have fixed the fiddle so that it works hopefully as you plan.
http://jsfiddle.net/399Dm/8/ There you go!
var forEach = function(ctn, callback){
return Array.prototype.forEach.call(ctn, callback);
}
function clear(element, index, array) {
element.getElementsByTagName("dir")[0].style.backgroundColor="";
}
function clicked(slide_button) {
forEach(document.getElementsByClassName("slide_button"), clear);
//.style.backgroundColor="";
slide_button.getElementsByTagName("dir")[0].style.backgroundColor="red";
}

I had a slightly different method than #atlavis but a similar result.
http://fiddle.jshell.net/2AGJQ/

JSFIDDLE DEMO
jQuery
$('.slide_button').click(function(){
$('.slide_button dir').css("background-color", "inherit");
$(this).find('dir').css("background-color", "red");
});
HTML - Your markup is invalid because you have duplicate ids. Make them classes as below instead.
<div class="slide_button" >
<dir class="button_1"></dir>
</div>
<div class="slide_button">
<dir class="button_2"></dir>
</div>
<div class="slide_button">
<dir class="button_3"></dir>
</div>
<div class="slide_button">
<dir class="button_4"></dir>
</div>
<div class="slide_button">
<dir class="button_5"></dir>
</div>
CSS change
.slide_button {
display: inline-block;
}

If you can look at the following jsfiddle, I used jQuery to get what you want.