input-image.php

<?php
/**
 * @var \WPDesk\Forms\Field $field
 * @var string              $name_prefix
 * @var string              $value
 */

$media_container_id = 'media_' . sanitize_key( $field->get_id() );
?>
<div class="media-input-wrapper" id="<?php echo $media_container_id; ?>">
    <input type="hidden" class="image-field-value" value="<?php echo \esc_html( $value ); ?>"
           name="<?php echo \esc_attr( $name_prefix ) . '[' . \esc_attr( $field->get_name() ) . ']'; ?>"
           id="<?php echo \esc_attr( $field->get_id() ); ?>"/>
    <div class="custom-img-container">
		<?php if ( $value ) : ?>
            <img src="<?php echo \esc_html( $value ) ?>" alt="" width="100"/>
		<?php endif; ?>
    </div>
    <p class="hide-if-no-js">
        <a class="upload-custom-img <?php if ( $value ): ?>hidden<?php endif ?>" href="<?php echo \esc_html( $value ) ?>">
			<?php _e( 'Set image', 'wp-forms' ) ?>
        </a>
        <a class="delete-custom-img <?php if ( ! $value ): ?>hidden<?php endif ?>" href="#">
			<?php _e( 'Remove image', 'wp-forms' ) ?>
        </a>
    </p>
</div>
<script>
	jQuery( function ( $ ) {
		var frame,
			metaBox = $( '#<?php echo esc_attr( $media_container_id ); ?>' ),
			addImgLink = metaBox.find( '.upload-custom-img' ),
			delImgLink = metaBox.find( '.delete-custom-img' ),
			imgContainer = metaBox.find( '.custom-img-container' ),
			imgIdInput = metaBox.find( '.image-field-value' );

		addImgLink.on( 'click', function ( event ) {
			event.preventDefault();
			if ( frame ) {
				frame.open();
				return;
			}

			frame = wp.media( {
				title: <?php _e( 'Select or Upload Media', 'wp-forms' ); ?>,
				button: {
					text: <?php _e( 'Use this media', 'wp-forms' ); ?>
				},
				library: {
					type: ['image']
				},
				multiple: false
			} );

			frame.on( 'select', function () {
				var attachment = frame.state().get( 'selection' ).first().toJSON();
				imgContainer.append( '<img src="' + attachment.url + '" alt="" width="100" />' );
				imgIdInput.val( attachment.url );
				addImgLink.addClass( 'hidden' );
				delImgLink.removeClass( 'hidden' );
			} );
			frame.open();
		} );

		delImgLink.on( 'click', function () {
			imgContainer.html( '' );
			addImgLink.removeClass( 'hidden' );
			delImgLink.addClass( 'hidden' );
			imgIdInput.val( '' );
			return false;
		} );

	} );
</script>