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我试图运行此代码时出现错误"Cannot set property 'onchange' of null"
。为什么它显示null
如果它不是空白的?Woocommerce分类显示“无法设置属性nul”
此代码不是我的,我在谷歌找到它,但它似乎在为别人工作。
function woo_product_categories_dropdown($atts) {
extract(shortcode_atts(array(
'count' => '0',
'hierarchical' => '0',
'orderby' => ''
), $atts));
ob_start();
$c = $count;
$h = $hierarchical;
$o = (isset($orderby) && $orderby != '') ? $orderby : 'order';
?>
<script type='text/javascript'>
/* <![CDATA[ */
var product_cat_dropdown = document.getElementById("dropdown_product_cat");
function onProductCatChange() {
var urlmenu = document.getElementById('menu1');
if (urlmenu) {
urlmenu.onchange = function()
{
window.open(this.options[ this.selectedIndex ].value,'_self');
};
}
if (product_cat_dropdown.options[product_cat_dropdown.selectedIndex].value !=='') {
location.href = "<?php echo home_url(); ?>/?product_cat="+product_cat_dropdown.options[product_cat_dropdown.selectedIndex].value;
}
}
product_cat_dropdown.onchange = onProductCatChange;
/* ]]> */
</script>
<?php
return ob_get_clean();
}