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Rename images before inserting it in Rich Text Editor in Angular RichTextEditor component

By using the insertImageSettings property, you can specify the server handler to upload the selected image. Then, you can bind the imageUploadSuccess event, to receive the modified file name from the server and update it in the Rich Text Editor’s insert image dialog.

<ejs-richtexteditor id='defaultRTE' #sample [insertImageSettings]='insertImageSettings' [toolbarSettings]='toolbarSettings' (imageUploadSuccess)='onImageUploadSuccess($event)'>
    <ng-template #valueTemplate>
    <p>The Rich Text Editor triggers events based on its actions. </p>
    <p> The events can be used as an extension point to perform custom operations.</p>
    <ul>
      <li>created - Triggers when the component is rendered.</li>
      <li>change - Triggers only when Rich Text Editor is blurred and changes are done to the content.</li>
      <li>focus - Triggers when Rich Text Editor is focused in.</li>
      <li>blur - Triggers when Rich Text Editor is focused out.</li>
      <li>actionBegin - Triggers before command execution using toolbar items or executeCommand method.</li>
      <li>actionComplete - Triggers after command execution using toolbar items or executeCommand method.</li>
      <li>destroyed – Triggers when the component is destroyed.</li>
    </ul>
    </ng-template>
</ejs-richtexteditor>
import { Component, ViewChild } from '@angular/core';
import { ToolbarService, LinkService, ImageService, HtmlEditorService, RichTextEditorComponent  } from '@syncfusion/ej2-angular-richtexteditor';
@Component({
    selector: 'app-root',
    templateUrl: 'app.compoenent.html',
    providers: [ToolbarService, LinkService, ImageService, HtmlEditorService ]
})
export class AppComponent  {
@ViewChild('sample') public rteObj: RichTextEditorComponent;

public toolbarSettings: Object = {
  items: ['Bold', 'Italic', 'Underline', 'StrikeThrough','|',
      'FontName', 'FontSize', 'FontColor', 'BackgroundColor',
      'LowerCase', 'UpperCase', '|',
      'Formats', 'Alignments', 'OrderedList', 'UnorderedList',
      'Outdent', 'Indent', '|',
      'CreateLink', 'Image', '|', 'ClearFormat', 'Print',
      'SourceCode', 'FullScreen', '|', 'Undo', 'Redo']
};
public insertImageSettings: object = {
    saveUrl: "[SERVICE_HOSTED_PATH]/api/uploadbox/Rename",
    path: "../Images/"
};

public onImageUploadSuccess = (args: any) => {
    if (args.e.currentTarget.getResponseHeader('name') != null) {
        args.file.name = args.e.currentTarget.getResponseHeader('name');
        let filename: any = document.querySelectorAll(".e-file-name")[0];
        filename.innerHTML = args.file.name.replace(document.querySelectorAll(".e-file-type")[0].innerHTML, '');
        filename.title = args.file.name;
    }
}

To configure the server-side handler, refer the below code.

[AcceptVerbs("Post")]
public void Rename()
{
    try
    {
        var httpPostedFile = System.Web.HttpContext.Current.Request.Files["UploadFiles"];
        imageFile = httpPostedFile.FileName;
        if (httpPostedFile != null)
        {
            var fileSave = System.Web.HttpContext.Current.Server.MapPath("~/Images");
            if (!Directory.Exists(fileSave))
            {
                Directory.CreateDirectory(fileSave);
            }
            var fileName = Path.GetFileName(httpPostedFile.FileName);
            var fileSavePath = Path.Combine(fileSave, fileName);
            while (System.IO.File.Exists(fileSavePath))
            {
                imageFile = "rteImage" + x + "-" + fileName;
                fileSavePath = Path.Combine(fileSave, imageFile);
                x++;
            }
            if (!System.IO.File.Exists(fileSavePath))
            {
                httpPostedFile.SaveAs(fileSavePath);
                HttpResponse Response = System.Web.HttpContext.Current.Response;
                Response.Clear();
                Response.Headers.Add("name", imageFile);
                Response.ContentType = "application/json; charset=utf-8";
                Response.StatusDescription = "File uploaded succesfully";
                Response.End();
            }
        }
    }
    catch (Exception e)
    {
        HttpResponse Response = System.Web.HttpContext.Current.Response;
        Response.Clear();
        Response.ContentType = "application/json; charset=utf-8";
        Response.StatusCode = 204;
        Response.Status = "204 No Content";
        Response.StatusDescription = e.Message;
        Response.End();
    }
}