如何将 WordPress 类别选择限制为一个? [英] How can I limit WordPress category selection to just one?

问题描述

我有自定义帖子类型和自定义分类设置 - 非常标准的东西.

I have a custom post type and a custom taxonomy setup - pretty standard stuff.

但是，我想知道如何限制我的客户在每个帖子中选择多个分类类别?

However, I would like to know how I can restrict my client from selecting more than one taxonomy category per post?

我不介意他们能够创建和删除分类类型，但我不希望他们选择多个.因为这些是复选框，所以它们可以.也许单选按钮可能有用?

I don't mind them being able to create and delete taxonomy types, but I don't want them selecting more than one. Because these are checkboxes, they CAN. Perhaps radio buttons might work?

我已经看到解决方案使用 jQuery 来更改这些字段，但它们似乎有点笨拙.执行此操作的最佳做​​法是什么?

I have seen solutions use jQuery to change these fields, but they seem a bit hacky. What's the best practice way to do this?

附件是我的自定义分类框的屏幕截图.

Attached, is a screenshot of my custom taxonomy box.

推荐答案

据我所知，我们必须使用 jQuery.它是hacky"但很容易工作，如果我的记忆力很好，纯 PHP/WP 解决方案真的很复杂.
这是必要的代码:

As far as I know, we have to use jQuery. It's "hacky" but works easily and a pure PHP/WP solution is really complex if my memory serves me well.
This is the necessary code:

jQuery("#categorychecklist input").each(function(){
    this.type = 'radio';
});

我们必须在页面/wp-admin/post.php 和/wp-admin/post-new.php 上运行代码.它应该在加载时运行，然后在创建新类别时再次运行.为了解决新的类别问题，我使用了 MutationObserver:

We have to run the code on the pages /wp-admin/post.php and /wp-admin/post-new.php. It should run on load and then run again if a new category is created. To solve the new category issue I used a MutationObserver:

foreach( array( 'post', 'post-new' ) as $hook )
    add_action( "admin_footer-$hook.php", 'convert_cats_to_radio' );

function convert_cats_to_radio(){
    global $post;
    if( $post->post_type !== 'post') // select your desired Post Type
        return;

    ?>
    <script type="text/javascript">
    function makeRadioButtons(){
        jQuery("#categorychecklist input").each(function(){
            this.type = 'radio';
        });
    }
    function newCategoryObserver(){
        // Example from developer.mozilla.org/en-US/docs/Web/API/MutationObserver
        var targetNode = document.getElementById('categorychecklist');
        var config = { attributes: true, childList: true, subtree: true };
        var callback = function(mutationsList) {
            for(var mutation of mutationsList) {
                if (mutation.type == 'childList') {
                    makeRadioButtons();
                }
            }
        };
        var observer = new MutationObserver(callback);
        observer.observe(targetNode, config);
    }
    newCategoryObserver();
    makeRadioButtons();
    </script>
    <?php
}

<小时>

相关:这个旧插件仍然有效完美解决子类层次问题.默认情况下，在WP中，选择一个子类别时，它不会在其父类别下显示，但在列表之上.它也是一个 jQuery 解决方案，由当时的 WP 核心开发人员编写.

---

Relevant: this old plugin still works perfectly to solve the issue of sub-categories hierarchy. By default in WP, when one sub-category is selected it doesn't show under its parent category but on top of the list. It's also a jQuery solution and written by a lead WP core developer at the time.

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