CKEditor5 自定义上传图片

公司的网站中也要集成富文本编辑器，我们选择了CKEditor 5，官方网址

在集成的过程中需要完成图片上传到公司服务器，在文档中有三种方法，三种方法，

第一种是用CKEditor 的服务肯定是不行，第二种需要后端配置一些东西，最好也不要麻烦别人，第三种就是自己根据引导去写一个自定义插件，因为他都基本写好了，所以比较容易，于是就自己写了一个MyUploadAdapter.js 文件，在需要的地方引用就可以使用其中的init方法来生成一个可以把图片上传到公司服务器的富文本编辑器，代码如下


import ClassicEditor from '@ckeditor/ckeditor5-build-classic';
export default class MyUploadAdapter {constructor( loader, url ) {// The FileLoader instance to use during the upload. It sounds scary but do not// worry — the loader will be passed into the adapter later on in this guide.this.loader = loader;// The upload URL in your server back-end. This is the address the XMLHttpRequest// will send the image data to.this.url = url;}// Starts the upload process.upload() {return new Promise( ( resolve, reject ) => {this._initRequest();this._initListeners( resolve, reject );this._sendRequest();} );}// Aborts the upload process.abort() {if ( this.xhr ) {this.xhr.abort();}}// Initializes the XMLHttpRequest object using the URL passed to the constructor._initRequest() {const xhr = this.xhr = new XMLHttpRequest();// Note that your request may look different. It is up to you and your editor// integration to choose the right communication channel. This example uses// the POST request with JSON as a data structure but your configuration// could be different.xhr.open( 'POST', this.url, true );xhr.responseType = 'json';}// Initializes XMLHttpRequest listeners._initListeners( resolve, reject ) {const xhr = this.xhr;const loader = this.loader;const genericErrorText = 'Couldn\'t upload file:' + ` ${ loader.file.name }.`;xhr.addEventListener( 'error', () => reject( genericErrorText ) );xhr.addEventListener( 'abort', () => reject() );xhr.addEventListener( 'load', () => {const response = xhr.response;// This example assumes the XHR server's "response" object will come with// an "error" which has its own "message" that can be passed to reject()// in the upload promise.//// Your integration may handle upload errors in a different way so make sure// it is done properly. The reject() function must be called when the upload fails.if ( !response || response.error ) {return reject( response && response.error ? response.error.message : genericErrorText );}// If the upload is successful, resolve the upload promise with an object containing// at least the "default" URL, pointing to the image on the server.// This URL will be used to display the image in the content. Learn more in the// UploadAdapter#upload documentation.resolve( {default: response.url} );} );// Upload progress when it is supported. The FileLoader has the #uploadTotal and #uploaded// properties which are used e.g. to display the upload progress bar in the editor// user interface.if ( xhr.upload ) {xhr.upload.addEventListener( 'progress', evt => {if ( evt.lengthComputable ) {loader.uploadTotal = evt.total;loader.uploaded = evt.loaded;}} );}}// Prepares the data and sends the request._sendRequest() {// Prepare the form data.const data = new FormData();data.append( 'File', this.loader.file );// Send the request.this.xhr.send( data );}}export let MyCustomUploadAdapterPlugin = ( editor ) => {editor.plugins.get( 'FileRepository' ).createUploadAdapter = ( loader ) => {// Configure the URL to the upload script in your back-end here!return new MyUploadAdapter( loader, '/common/img/upload' );};
}export let init = () => {ClassicEditor.create( document.querySelector( '#editor'),{toolbar: ["heading", "|", "alignment:left", "alignment:center", "alignment:right", "alignment:adjust", "|", "bold", "italic", "blockQuote", "link", "|", "bulletedList", "numberedList", "imageUpload", "|", "undo", "redo"],extraPlugins: [ MyCustomUploadAdapterPlugin ]} ).then((editor) => {console.log( editor );} ).catch( (error) => {console.error( error );} );
}

调研集成的过程比普通业务代码要复杂一些：

首先是文件的导出导入出了一些问题，

其次是公司的上传接口，即new MyUploadAdapter 处传入的第二个参数，是要首先登陆成功才可以调用，

最后是，_sendRequest方法中的data.append( 'File', this.loader.file ); 这里的File 要根据接口定义的变量名来写，

调试过程需要首先弄明白后端的接口需要什么样的数据，根据后端的要求来调整自己的MyUploadAdapter.js

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