kurisucn.github.io/html-import.js at master · kurisucn/kurisucn.github.io · GitHub

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/**
 * @description 借助废弃的html import语法实现HTML或者其他代码片段的include功能
 * 更多内容访问：https://www.zhangxinxu.com/wordpress/?p=10009
 * @author zhangxinxu(.com)
 * @create 2021-07-20
 * @license MIT
 */

class HtmlImport extends HTMLLinkElement {
    constructor () {
        super();
    }
    static get observedAttributes () {
        return ['href'];
    }

    load () {
        fetch(this.href).then(res => {
            if (res.ok) {
                return res.text();
            }
            this.dispatchEvent(new CustomEvent('error', {
                detail: {
                    error: '加载失败',
                    response: res
                }
            }));
        }).catch(error => {
            // 触发error事件
            this.dispatchEvent(new CustomEvent('error', {
                detail: {
                    error: '网络异常',
                    response: {
                        ok: false,
                        status: -1,
                        statusText: error
                    }
                }
            }));
        }).then(html => {
            if (typeof html == 'string') {
                this.style.display = 'block';
                this.innerHTML = html;

                // 触发load事件
                this.dispatchEvent(new CustomEvent('load'));
            }
        });
    }

    attributeChangedCallback (name) {
        if (name == 'href') {
            this.load();
        }
    }
}
if (!customElements.get('ui-import')) {
    customElements.define('ui-import', HtmlImport, {
        extends: 'link'
    });
}