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Wordpress Search with a Floating Form Label and a Search Icon Prefix

searchform.php

<?php
/* Custom search form */
?>

The CSS

:root {
    --font-size: 1.375rem;
    --font-weight: 400;
    --x-pad: 2rem;
    --text-indent: 2.5rem;
}

.form-group {
    align-items: center;
    display: flex;
    position: relative;

    input {
        appearance: none;
        font-size: var(--font-size);
        font-weight: var(--font-weight);
        padding: 1rem var(--x-pad);
        text-indent: var(--text-indent);
        transition: 250ms;
        width: 100%;
    }

    .icon {
        background-position: center;
        background-repeat: no-repeat;
        background-size: 1.5rem 1.5rem;
        display: block;
        height: 1.5rem;
        left: var(--x-pad);
        position: absolute;
        width: 1.5rem;

        &.search {
            background-image: url('search.svg');
        }
    }

    .floating-label {
        color: #dee2e6;
        font-size: var(--font-size);
        font-weight: var(--font-weight);
        position: absolute;
        left: calc(var(--x-pad) + var(--text-indent));
        transition: 250ms;
    }

    &.focused {
        .floating-label {
            visibility: hidden;
        }
    }
}

The JavaScript:

const hideFloatingLabelOnFocus = () => {
    document.querySelectorAll( '.form-group' ).forEach( ( formGroup ) => {
        const input = formGroup.querySelector( 'input' );
        if ( input.value !== '' ) {
            formGroup.classList.add( 'focused' );
        }

        input.addEventListener( 'focus', function () {
            formGroup.classList.add( 'focused' );
        });

        input.addEventListener( 'blur', function () {
            if ( this.value === '' ) {
                formGroup.classList.remove( 'focused' );
            }
        });

    });
}

if ( document.readyState === 'loading' ) {
    // Loading hasn't finished yet, set an event listener
    document.addEventListener( 'DOMContentLoaded', hideFloatingLabelOnFocus );
} else {
    // `DOMContentLoaded` has already fired, run the func directly
    hideFloatingLabelOnFocus();
}

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