How to Create Image-Based Checkboxes Using Pure Semantic HTML and CSS?

Creating Image-Based Checkboxes with Pure Semantic HTML/CSS

Instead of relying on pre-made solutions, you can implement this feature with purely semantic HTML and CSS, fostering your understanding of CSS operations.

Step 1: Semantic HTML

Define distinct id attributes for your checkboxes and wrap them in elements with for attributes matching the checkbox id. This establishes a direct link between the label and checkbox, such that clicking the label triggers a toggle action for the checkbox.

Example:

<input type="checkbox">

Step 2: Hiding the Checkbox

Apply CSS to conceal the checkbox, e.g., display: none;.

Step 3: Styling the Visual Checkbox

Employ CSS's ::before pseudo element to create a visual representation of the checkbox:

label::before {
    background-image: url(unchecked.png);
}

Step 4: Implementing Checked State

Modify the styles when the checkbox is checked, using CSS's :checked pseudo selector:

:checked + label::before {
    background-image: url(checked.png);
}

Remember, the adjacent sibling selector ensures that style changes apply only to labels immediately following the hidden checkbox.

Step 5: Position, Dimensions, and Transitions

Position the label correctly, assign appropriate dimensions and apply smooth transitions to enhance the user experience.

Example (JavaScript Snippet):

ul {
    list-style-type: none;
}

li {
    display: inline-block;
}

input[type="checkbox"][id^="cb"] {
    display: none;
}

label {
    border: 1px solid #fff;
    padding: 10px;
    display: block;
    position: relative;
    margin: 10px;
    cursor: pointer;
    -webkit-touch-callout: none;
    -webkit-user-select: none;
    -khtml-user-select: none;
    -moz-user-select: none;
    -ms-user-select: none;
    user-select: none;
}

label::before {
    background-color: white;
    color: white;
    content: " ";
    display: block;
    border-radius: 50%;
    border: 1px solid grey;
    position: absolute;
    top: -5px;
    left: -5px;
    width: 25px;
    height: 25px;
    text-align: center;
    line-height: 28px;
    transition-duration: 0.4s;
    transform: scale(0);
}

label img {
    height: 100px;
    width: 100px;
    transition-duration: 0.2s;
    transform-origin: 50% 50%;
}

:checked+label {
    border-color: #ddd;
}

:checked+label::before {
    content: "✓";
    background-color: grey;
    transform: scale(1);
}

:checked+label img {
    transform: scale(0.9);
    box-shadow: 0 0 5px #333;
    z-index: -1;
}

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