将JSON-LD（Schema）脚本注入WordPress网站的头部
[英]Injecting JSON-LD (Schema) scripts into head of WordPress site
问题描述
I have a bunch of JSON-LD files that I want to inject into the head of various pages, some conditionally. 
我有一堆JSON-LD文件，有条件地要注入到各个页面的头部。 I'm using WordPress, and their recommendation is to use a function like wp_enqueue_script . 我正在使用WordPress，他们的建议是使用类似wp_enqueue_script的函数。 The difficulty is I've yet to find a way to edit the <type> attribute using the wp_enqueue_script function. 困难在于我还没有找到使用wp_enqueue_script函数编辑<type>属性的方法。
I was able to do it clumsily with PHP like this (maybe there's a better PHP function?): 我可以像这样用PHP笨拙地做到这一点（也许有更好的PHP函数？）：
// header.php
<head>
...all the regular stuff..
..near the bottom..
<?php
if ( is_front_page() ) {
echo file_get_contents(get_template_directory() . '/assets/structured-data/local-business.js');
}
?>
</head>
The scripts I'm trying to inject are formatted like this: 我尝试注入的脚本的格式如下：
// JSON-LD format
<script type="application/ld+json">
{
"@context": "http://schema.org",
"@type": "localBusiness",
"currenciesAccepted": ...
}
</script>
So I`m just trying to read the files in. This breaks when I try to include multiple scripts. 因此，我只是想读取文件。当我尝试包含多个脚本时，这会中断。
I would like to follow WP recommendations and use a method like wp_enqueue_script() but as of yet, I haven't found a way to do that. 我想遵循WP建议，并使用类似wp_enqueue_script()的方法，但wp_enqueue_script() ，我还没有找到一种方法来做到这一点。 The whole function won't work unless I can mark the scripts as type="application/ld+json" , required for JSON-LD. 除非我可以将脚本标记为JSON-LD所需的type="application/ld+json" ，否则整个功能将无法工作。
2 个解决方案
解决方案1
0 2018-11-08 21:54:46
The way I am currently doing this is with add_action(); 我目前的方式是使用add_action（）;
add_action( 'wp_head', 'my_theme_schema' );
Then in my_theme_schema, I build my schema, and just output it with the script tags. 然后，在my_theme_schema中，构建我的架构，然后将其与脚本标签一起输出。 ( I typically build the schema with an array ). （我通常使用数组构建架构）。
function my_theme_schema() {
$schema = [];
... // build up the schema
$output = json_encode( $schema, JSON_UNESCAPED_SLASHES );
?>
<script type="application/ld+json">
<?= $output; ?>
</script>
<?php
}
This gives me the opportunity to put it in the functions.php. 这使我有机会将其放入functions.php中。
Also, I typically do not put it in the head, I put it in the footer. 另外，我通常不放在头部，而是放在页脚。
add_action( 'wp_footer', 'my_theme_schema' );
I don't know if one is inherently better, I just prefer JS in the footer. 我不知道一个人是否天生好一点，我只喜欢在页脚中使用JS。
解决方案2
0 2019-02-22 16:34:18
I found a way to do this: 我找到了一种方法来做到这一点：
//here we enqueue a dummy script to help us with what we want to achieve
add_action('wp_enqueue_scripts', 'myslug_wp_load_files');
function myslug_wp_load_files()
{
wp_register_script( 'myslug-dummy-handle-json-footer', plugins_url('scripts/loader.js', __FILE__), [], '', true );
wp_enqueue_script( 'myslug-dummy-handle-json-footer' );
}
//here we construct our ldjson and add it to our enqueued script
add_action('wp_head', 'myslug_construct_ldjson');
function myslug_construct_ldjson()
{
$my_ldjson = '{construct_here_your_ldjson}';
wp_add_inline_script( 'myslug-dummy-handle-json-footer', $my_ldjson );
}
//here we add a filter to the script loader, and modify text/javascript to application/ld+json
add_filter( 'script_loader_tag', 'myslug_async_tag', 10, 3 );
function myslug_async_tag( $tag, $handle, $src )
{
if ( $handle !== 'myslug-dummy-handle-json-footer' )
{
return $tag;
}
$tag = str_replace("type='text/javascript'", "type='application/ld+json'", $tag);
return $tag;
}
The above script registers and enqueue a dummy script - which can be practically anything (or even blank). 上面的脚本注册并加入一个虚拟脚本-几乎可以是任何虚拟脚本（甚至是空白）。 Also, it adds the dynamically generated JSON-LD to the dummy script and then it filters all scripts, selects only the script we created and replaces type 'text/javascript' with type 'application/ld+json'. 另外，它将动态生成的JSON-LD添加到虚拟脚本中，然后过滤所有脚本，仅选择我们创建的脚本，然后将类型“ text / javascript”替换为类型“ application / ld + json”。
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