text input area disappears when only one unit remains in stock (single product

This isn’t a bug, its how its supposed to work.

You can suggest a change to how woocommerce works on this site:
https://ideas.woocommerce.com/forums/133476-woocommerce
but there are many suggestions.

The following article suggests a way round. Not tested it myself.
https://stackoverflow.com/questions/48724400/woocommerce-quantity-button-disappear-for-a-single-unit-in-stock

Or you can modify the template:
templates/global/quantity-input.php
and put your custom template in your child theme.

There is the complication of hiding or deactivating your + / – buttons.

Either way, modest PHP skills or a developer will be needed.

We haven’t heard back from you in a while, so I’m going to mark this as resolved – if you have any further questions, you can start a new thread.

hi excuse me unfortunately I was absent. here’s how I solved maybe it can be useful to someone else with the same problem I studied the code a bit replace this code entirely in the php file

/wp-content/plugins/woocommerce/templates/global/quantity-input.php

<?php
/**
* Product quantity inputs
*
* This template can be overridden by copying it to yourtheme/woocommerce/global/quantity-input.php.
*
* HOWEVER, on occasion WooCommerce will need to update template files and you
* (the theme developer) will need to copy the new files to your theme to
* maintain compatibility. We try to do this as little as possible, but it does
* happen. When this occurs the version of the template file will be bumped and
* the readme will list any important changes.
*
* @see https://docs.woocommerce.com/document/template-structure/
* @package WooCommerce\Templates
* @version 4.0.0
*/

defined( ‘ABSPATH’ ) || exit;

if ( $max_value && $min_value === $max_value ) {
/* translators: %s: Quantity. */
$label = ! empty( $args[‘product_name’] ) ? sprintf( esc_html__( ‘%s quantity’, ‘woocommerce’ ), wp_strip_all_tags( $args[‘product_name’] ) ) : esc_html__( ‘Quantity’, ‘woocommerce’ );
?>
<div class=”quantity”>
<?php do_action( ‘woocommerce_before_quantity_input_field’ ); ?>
<label class=”screen-reader-text” for=”<?php echo esc_attr( $input_id ); ?>”><?php echo esc_attr( $label ); ?></label>
<input
type=”number”
id=”<?php echo esc_attr( $input_id ); ?>”
class=”<?php echo esc_attr( join( ‘ ‘, (array) $classes ) ); ?>”
step=”<?php echo esc_attr( $step ); ?>”
min=”<?php echo esc_attr( $min_value ); ?>”
max=”<?php echo esc_attr( 0 < $max_value ? $max_value : ” ); ?>”
name=”<?php echo esc_attr( $input_name ); ?>”
value=”<?php echo esc_attr( $input_value ); ?>”
title=”<?php echo esc_attr_x( ‘Qty’, ‘Product quantity input tooltip’, ‘woocommerce’ ); ?>”
size=”4″
placeholder=”<?php echo esc_attr( $placeholder ); ?>”
inputmode=”<?php echo esc_attr( $inputmode ); ?>” />
<?php do_action( ‘woocommerce_after_quantity_input_field’ ); ?>
</div>
<?php
} else {
/* translators: %s: Quantity. */
$label = ! empty( $args[‘product_name’] ) ? sprintf( esc_html__( ‘%s quantity’, ‘woocommerce’ ), wp_strip_all_tags( $args[‘product_name’] ) ) : esc_html__( ‘Quantity’, ‘woocommerce’ );
?>
<div class=”quantity”>
<?php do_action( ‘woocommerce_before_quantity_input_field’ ); ?>
<label class=”screen-reader-text” for=”<?php echo esc_attr( $input_id ); ?>”><?php echo esc_attr( $label ); ?></label>
<input
type=”number”
id=”<?php echo esc_attr( $input_id ); ?>”
class=”<?php echo esc_attr( join( ‘ ‘, (array) $classes ) ); ?>”
step=”<?php echo esc_attr( $step ); ?>”
min=”<?php echo esc_attr( $min_value ); ?>”
max=”<?php echo esc_attr( 0 < $max_value ? $max_value : ” ); ?>”
name=”<?php echo esc_attr( $input_name ); ?>”
value=”<?php echo esc_attr( $input_value ); ?>”
title=”<?php echo esc_attr_x( ‘Qty’, ‘Product quantity input tooltip’, ‘woocommerce’ ); ?>”
size=”4″
placeholder=”<?php echo esc_attr( $placeholder ); ?>”
inputmode=”<?php echo esc_attr( $inputmode ); ?>” />
<?php do_action( ‘woocommerce_after_quantity_input_field’ ); ?>
</div>
<?php
}
Merry Christmas.