Is there a way to manipulate a button's toggle state using Javascript as the page loads?

I am in the process of developing a straightforward web application that allows users to customize their settings. On the settings page, there are several toggle buttons that need to have their state changed during the page load to align with the preferences stored in the database.

The CSS for the toggle buttons utilizes a :before pseudo selector (see code snippet below), so I am wondering if there is a way to manipulate the button state using JavaScript before the page finishes loading? Thank you!

.switch {
    position: relative;
    display: inline-block;
    width: 60px;
    height: 34px;
}

/* Hide default HTML checkbox */
.switch input {
    opacity: 0;
    width: 0;
    height: 0;
}

/* The slider */
.slider {
    position: absolute;
    cursor: pointer;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background-color: #ccc;
    -webkit-transition: .4s;
    transition: .4s;
}

.slider:before {
    position: absolute;
    content: "";
    height: 26px;
    width: 26px;
    left: 4px;
    bottom: 4px;
    background-color: white;
    -webkit-transition: .4s;
    transition: .4s;
}

input:checked+.slider {
    background-color: #2196F3;
}

input:focus+.slider {
    box-shadow: 0 0 1px #2196F3;
}

input:checked+.slider:before {
    -webkit-transform: translateX(26px);
    -ms-transform: translateX(26px);
    transform: translateX(26px);
}

/* Rounded sliders */
.slider.round {
    border-radius: 34px;
}

.slider.round:before {
    border-radius: 50%;
}
<label class="switch">
   <input type="checkbox" id="privacy-button">
   <span class="slider round"></span>
</label>

Answer №1

By including the checked attribute in the input element, you can visually represent the button as being selected.

<label class="switch">
   <input type="checkbox" id="privacy-button" checked="">
   <span class="slider round"></span>
</label>

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