javascript Woocommerce 3 中的自定义加减数量按钮
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Custom plus and minus quantity buttons in Woocommerce 3
提问by Kai
I'm building custom WordPress and WooCommerce theme and adding custom plus and minus buttons to Product page quantity field. The buttons do update quantity input's value and I also receive "Item has been added to your cart" notification (on Product page) when I submit Add to Cart. But the cart page doesn't show any items, neither says the cart is empty.
我正在构建自定义 WordPress 和 WooCommerce 主题，并向产品页面数量字段添加自定义加号和减号按钮。这些按钮会更新数量输入的值，并且当我提交添加到购物车时，我还会收到“商品已添加到您的购物车”通知（在产品页面上）。但是购物车页面没有显示任何项目，也没有说购物车是空的。
I can not work out which WooCommerce JS function I'm suppose to hook into, neither how to hook into it. Could I ask for help please?! Thanks in advance!
我不知道我想挂钩哪个 WooCommerce JS 函数，也不知道如何挂钩。请问可以帮忙吗？！提前致谢！
My HTML layout:
我的 HTML 布局：
<div class="quantity">
<label class="quantity__label" for="<?php echo esc_attr( $input_id ); ?>"><?php esc_html_e( 'Quantity:', 'woocommerce' ); ?></label>
<div class="quantity__wrapper">
<input type="button" value="-" class="quantity__button quantity__remove js-qty-remove" />
<input
type="text"
id="<?php echo esc_attr( $input_id ); ?>"
class="input-text qty text quantity__input"
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"
pattern="<?php echo esc_attr( $pattern ); ?>"
inputmode="<?php echo esc_attr( $inputmode ); ?>"
aria-labelledby="<?php echo esc_attr( $labelledby ); ?>" />
<input type="button" value="+" class="quantity__button quantity__add js-qty-add" />
</div>
</div>
My custom jQuery function:
我的自定义 jQuery 函数：
function quantityButtons() {
var $qtyAdd = $('.js-qty-add'),
$qtyRemove = $('.js-qty-remove'),
$qtyInput = $('.quantity__input');
$qtyAdd.on('click', addQty);
$qtyRemove.on('click', removeQty);
function addQty() {
var $qtyInput = $('.quantity__input'),
$qtyRemove = $('.js-qty-remove'),
$i = $qtyInput.val();
$i++;
$qtyRemove.attr("disabled", !$i);
$qtyInput.val($i);
}
function removeQty() {
var $qtyInput = $('.quantity__input'),
$qtyRemove = $('.js-qty-remove'),
$i = $qtyInput.val();
if ($i >= 1) {
$i--;
$qtyInput.val($i);
} else {
$qtyRemove.attr("disabled", true);
}
}
$qtyRemove.attr("disabled", !$qtyInput.val());
}
quantityButtons();
回答by LoicTheAztec
Your First code part is made from a customization of global/quantity-input.phpWoocommerce template code…
您的第一个代码部分是由global/quantity-input.phpWoocommerce 模板代码的自定义...
So for testing, I have changed partially that global/quantity-input.phptemplate code with the following (very near to your code):
因此，为了进行测试，我global/quantity-input.php使用以下内容部分更改了模板代码（非常接近您的代码）：
?>
<div class="quantity">
<label class="screen-reader-text" for="<?php echo esc_attr( $input_id ); ?>"><?php esc_html_e( 'Quantity', 'woocommerce' ); ?></label>
<input type="button" value="-" class="qty_button minus" />
<input
type="number"
id="<?php echo esc_attr( $input_id ); ?>"
class="input-text qty text"
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"
pattern="<?php echo esc_attr( $pattern ); ?>"
inputmode="<?php echo esc_attr( $inputmode ); ?>"
aria-labelledby="<?php echo esc_attr( $labelledby ); ?>" />
<input type="button" value="+" class="qty_button plus" />
</div>
<?php
Now the necessary CSS and revisited jQuery code functions:
现在必要的 CSS 和重新审视的 jQuery 代码功能：
// Minimum CSS to remove +/- default buttons on input field type number
add_action( 'wp_head' , 'custom_quantity_fields_css' );
function custom_quantity_fields_css(){
?>
<style>
.quantity input::-webkit-outer-spin-button,
.quantity input::-webkit-inner-spin-button {
display: none;
margin: 0;
}
.quantity input.qty {
appearance: textfield;
-webkit-appearance: none;
-moz-appearance: textfield;
}
</style>
<?php
}
add_action( 'wp_footer' , 'custom_quantity_fields_script' );
function custom_quantity_fields_script(){
?>
<script type='text/javascript'>
jQuery( function( $ ) {
if ( ! String.prototype.getDecimals ) {
String.prototype.getDecimals = function() {
var num = this,
match = ('' + num).match(/(?:\.(\d+))?(?:[eE]([+-]?\d+))?$/);
if ( ! match ) {
return 0;
}
return Math.max( 0, ( match[1] ? match[1].length : 0 ) - ( match[2] ? +match[2] : 0 ) );
}
}
// Quantity "plus" and "minus" buttons
$( document.body ).on( 'click', '.plus, .minus', function() {
var $qty = $( this ).closest( '.quantity' ).find( '.qty'),
currentVal = parseFloat( $qty.val() ),
max = parseFloat( $qty.attr( 'max' ) ),
min = parseFloat( $qty.attr( 'min' ) ),
step = $qty.attr( 'step' );
// Format values
if ( ! currentVal || currentVal === '' || currentVal === 'NaN' ) currentVal = 0;
if ( max === '' || max === 'NaN' ) max = '';
if ( min === '' || min === 'NaN' ) min = 0;
if ( step === 'any' || step === '' || step === undefined || parseFloat( step ) === 'NaN' ) step = 1;
// Change the value
if ( $( this ).is( '.plus' ) ) {
if ( max && ( currentVal >= max ) ) {
$qty.val( max );
} else {
$qty.val( ( currentVal + parseFloat( step )).toFixed( step.getDecimals() ) );
}
} else {
if ( min && ( currentVal <= min ) ) {
$qty.val( min );
} else if ( currentVal > 0 ) {
$qty.val( ( currentVal - parseFloat( step )).toFixed( step.getDecimals() ) );
}
}
// Trigger change event
$qty.trigger( 'change' );
});
});
</script>
<?php
}
Code goes in function.php file of your active child theme (or active theme). Tested and works.
代码位于活动子主题（或活动主题）的 function.php 文件中。测试和工作。
The quantity buttons "plus" and "minus" work perfectly and are displayed this way:
数量按钮“加号”和“减号”工作正常，并以这种方式显示：
Products are added to cart with the correct quantity:
产品以正确的数量添加到购物车：
if you change the quantity field value with plus and minus buttons, the "Update cart" button is activated when any quantity field change.
如果您使用加号和减号按钮更改数量字段值，则任何数量字段更改时都会激活“更新购物车”按钮。
When you click on "Update cart", the quantities as correctly updated.
当您点击“更新购物车”时，数量会正确更新。
回答by Krishna
/* Show Buttons */
add_action( 'woocommerce_before_add_to_cart_quantity', 'display_quantity_plus' );
function display_quantity_plus() {
echo '<button type="button" class="plus" >+</button>';
}
add_action( 'woocommerce_after_add_to_cart_quantity', 'display_quantity_minus' );
function display_quantity_minus() {
echo '<button type="button" class="minus" >-</button>';
}
//Note: to place minus @ left and plus @ right replace above add_actions with:
//add_action( 'woocommerce_before_add_to_cart_quantity', 'display_quantity_minus' );
//add_action( 'woocommerce_after_add_to_cart_quantity', 'display_quantity_plus' );
add_action( 'wp_footer', 'add_cart_quantity_plus_minus' );
function add_cart_quantity_plus_minus() {
// Only run this on the single product page
if ( ! is_product() ) return;
?>
<script type="text/javascript">
jQuery(document).ready(function($){
$('form.cart').on( 'click', 'button.plus, button.minus', function() {
// Get current quantity values
var qty = $( this ).closest( 'form.cart' ).find( '.qty' );
var val = parseFloat(qty.val());
var max = parseFloat(qty.attr( 'max' ));
var min = parseFloat(qty.attr( 'min' ));
var step = parseFloat(qty.attr( 'step' ));
// Change the value if plus or minus
if ( $( this ).is( '.plus' ) ) {
if ( max && ( max <= val ) ) {
qty.val( max );
} else {
qty.val( val + step );
}
} else {
if ( min && ( min >= val ) ) {
qty.val( min );
} else if ( val > 1 ) {
qty.val( val - step );
}
}
});
});
</script>
//add css
.single-product div.product form.cart .quantity {
float: none;
margin: 0;
display: inline-block;
}
