如何与ng2文件一起提交输入数据上传Angular ION

问题描述

请发送一些带有文本文件上传（ng2文件上传）的文本数据。我也是角和离子的新手。我尝试了很多选择，但似乎没有出路。我使用PHP作为后端，我只能发送文件，但不能发送用户名等输入数据。同时，我能够在控制台上记录用户名的输入数据，但服务器响应为null。而且它永远不会插入我的数据库中。这是我的代码。

public fileUploader: FileUploader = new FileUploader({});

ngOnInit() {
    this.fileUploader = new FileUploader({ url: "http://localhost/paat/server/post.PHP"});
 
    this.fileUploader.onBuildItemForm = (fileItem: any,form: FormData): any => {
        form.append('body',this.body);
        form.append('username',this.username);

        // Add file to upload
        form.append('file',fileItem);

        fileItem.withCredentials = false;
        return { fileItem,form };
    };
}

fileOverBase(event): void {
    this.hasBaseDropZoneOver = event;
}

//return files from ng2 upload 
getFiles(): FileLikeObject[] {
    return this.fileUploader.queue.map((fileItem) => {
      return fileItem.file;
    });
}

// the upload method where the post to server is made
uploadFiles() {
    let bodys = {
      body:this.body,username:this.username,};
    let files = this.getFiles();
    let requests = [];
    
    files.forEach((file) => {
        let formData = new FormData();
        formData.append('file',file.rawFile,file.name);
        formData.append('body',this.body);
        formData.append('username',this.username);
        requests.push(this.uploadingService.uploadFormData(formData));
    });

    concat(...requests).subscribe(
        (res) => {
            console.log(res);
            console.log(this.body);
            console.log(this.username);
            console.log(this.file.name);
        },(err) => {  
            console.log(err);
        }
    );
}

这是我的uploadservice.ts

import { Injectable } from '@angular/core';
import { HttpClient } from '@angular/common/http';

@Injectable({
    providedIn: 'root'
})
export class UploadingService {

  API_SERVER: string = "http://localhost/paat/server/post.PHP";
  
  constructor(private http: HttpClient) { }

    public uploadFormData(formData) {
        return this.http.post<any>(`${this.API_SERVER}`,formData);
    }
}

这是我的后端代码：

<?PHP
header("Access-Control-Allow-Origin: *");
header("Content-Type: application/json; charset=UTF-8");
header("Access-Control-Allow-Methods:POST,GET,PUT,DELETE");
header("Access-Control-Max-Age:86400");
header("Access-Control-Allow-Headers: Content-Type,Access-Control-Allow-Headers,Authorization,X-Requested-With");

$con = MysqLi_connect("localhost","root","","social");
$postjson = json_decode(file_get_contents('PHP://input'),true);

$filename = $_FILES['file']['name'];
$Meta = $_POST;
$targetDir = "assets/images/posts/";
$destination = $targetDir . $filename;
move_uploaded_file( $_FILES['file']['tmp_name'],$destination );

$body = $postjson['body'];
  
$date_added = date("Y-m-d H:i:s");

//get username
$added_by = $postjson['username'];

//if user is on own profile,user_to is 'none'
$targetfile = $destination;
    
$user_to ="none";

$query = MysqLi_query($con,"INSERT INTO posts VALUES(NULL,'$body','$added_by','$user_to','$date_added','no','0','$targetfile')");

我在做什么错？请帮忙。

解决方法

我发现我做错了。问题出在我的后端代码上。这是我从请求中检索formdata值的方式。所以我改变了

$body = $postjson['body'];
$added_by = $postjson['username'];

到

$body = $_POST['body'];
$added_by = $_POST['username'];

我也将ngOnInit（）方法和fileuploader方法的实例修改为

public fileUploader: FileUploader = new FileUploader({ url: "http://localhost/paat/server/post.php"});

ngOnInit() {
   
    
    this.fileUploader.onBuildItemForm = (fileItem: any,form: FormData): any => {
      
      form.append('body',this.body);

      // Add file to upload
      form.append('file',fileItem);
      form.append('username',this.username);

    
      fileItem.withCredentials = false;
      return { fileItem,form };
    };
}

现在可以使用了。