给WooCommerce订单添加自定义字段并添加到管理员通知邮件

<?php

//增加checkout页面字段

add_action('woocommerce_after_order_notes', 'brain1981_custom_checkout_field');

//如果想在左侧那一列显示此字段，就要换成下面这个钩子：

//add_action('woocommerce_after_checkout_billing_form', 'brain1981_custom_checkout_field');

function brain1981_custom_checkout_field($checkout){

	woocommerce_form_field('alivecor_referral_channel', array(

		'type' => 'select',

		'label' => __('Through which channel did you know our product?' ),

		'placeholder' => __('Please Select' ),

		'required'	=> true,

		'options' => array(

			''		=> __('Please Select' ),

			'Doctor referral' => __('Doctor referral' ),

			'Friend referral' => __('Friend referral' ),

			'Online advertisement' => __('Online advertisement' ),

			'Offline advertisement' => __('Offline advertisement' ),

			'News' => __('News' ),

			'Others' => __('Others' )

			)

		),

		$checkout->get_value('alivecor_referral_channel')

	);

	echo "<div id='channelOther'>";

	woocommerce_form_field('alivecor_referral_channel_other', array(

		'type' => 'text',

		'label' => __('Others' ),

		'placeholder' => __('Please fill the channel' ),

		'required'	=> false,

		),

		$checkout->get_value('alivecor_referral_channel_other')

	);

	echo "</div>";

	?>

<script>

//额外字段的显示控制

$(function(){

	$("#channelOther").hide();

	$("#alivecor_referral_channel").on("change",function(){

		if( $(this).val()=="Others" ) $("#channelOther").show();

		else $("#channelOther").hide();

	})

})

</script>

	<?php

}

//如果必填的那个下拉菜单没有选择，提交的时候给出一条报错提醒用户选一下，WooCommerce自己会高亮提示这个选项

add_action('woocommerce_checkout_process', 'brain1981_customised_checkout_field_process');

function brain1981_customised_checkout_field_process(){

	if (empty( $_POST['alivecor_referral_channel'] ))

		wc_add_notice( __('Please select a channel you know us trough.' ), 'error' );

}

//保存这两个值

add_action( 'woocommerce_checkout_update_order_meta', 'brain1981_save_custom_checkout_field' );

function brain1981_save_custom_checkout_field( $order_id ){

	if( !empty( $_POST['alivecor_referral_channel'] ) )

		update_post_meta( $order_id, 'alivecor_referral_channel', sanitize_text_field( $_POST['alivecor_referral_channel'] ) );

	if( !empty( $_POST['alivecor_referral_channel_other'] ) &&  $_POST['alivecor_referral_channel']=="Others" )

		update_post_meta( $order_id, 'alivecor_referral_channel_other', sanitize_text_field( $_POST['alivecor_referral_channel_other'] ) );

}

//在订单提交的管理员通知邮件中添加显示这两个只

//这里其实可以举一反三增加更多内容

add_filter( 'woocommerce_email_order_meta_fields', 'brain1981_email_order_meta_fields', 10, 3 );

function brain1981_email_order_meta_fields( $fields, $sent_to_admin, $order ) {

	$fields['alivecor_referral_channel'] = array(

				'label' => __( 'Channel' ),

				'value' => $order->get_meta( 'alivecor_referral_channel' ),

		);

	$fields['alivecor_referral_channel_other'] = array(

				'label' => __( 'Other Channel' ),

				'value' => $order->get_meta( 'alivecor_referral_channel_other' ),

		);

	return $fields;

}

//在管理员后台订单详细页面也显示一下

add_action( 'woocommerce_admin_order_data_after_order_details', 'brain_display_order_data_in_admin' );

function brain_display_order_data_in_admin( $order ){  ?>

    <div class="order_data_column">

        <h4><?php _e( 'Extra Order Details', 'woocommerce' ); ?></h4>

        <?php 

            echo '<p><strong>' . __( 'Channel' ) . ':</strong> ' . $order->get_meta( 'alivecor_referral_channel' ) . '</p>';

            echo '<p><strong>' . __( 'Other Channel' ) . ':</strong> ' . $order->get_meta( 'alivecor_referral_channel_other' ) . '</p>'; ?>

    </div>

<?php } ?>