I get error property name when press upload Button?

Question

I work on angular 7 project I face issue I get error Property Name when upload data .

I choose file first then after that press button Upload

after press button upload I get this error below :

core.js:4197 ERROR TypeError: Cannot read property 'name' of undefined  
    at UploadComponent.uploadFile (upload.component.ts:96)  
    at UploadComponent_Template_button_click_5_listener (upload.component.html:6)  
    at executeListenerWithErrorHandling (core.js:14286)  
    at wrapListenerIn_markDirtyAndPreventDefault (core.js:14321)  
    at HTMLButtonElement.<anonymous> (platform-browser.js:582)  
    at ZoneDelegate.invokeTask (zone-evergreen.js:399)  
    at Object.onInvokeTask (core.js:27394)  
    at ZoneDelegate.invokeTask (zone-evergreen.js:398)  
    at Zone.runTask (zone-evergreen.js:167)  
    at ZoneTask.invokeTask [as invoke] (zone-evergreen.js:480)  

I get this error on line below :

formData.append('file', fileToUpload, fileToUpload.name); 

full uplod code

component.html

<div class="col-md-3">  
   <input type="file" #file placeholder="Choose file"  multiple>  
     
   <button type="button" class="btn btn-success" (click)="uploadFile(file)">Upload File</button>  
 </div>  

component.ts

public uploadFile = (files) => {  
    if (files.length === 0) {  
      return;  
    }  
  
    let fileToUpload = <File>files[0];  
    const formData = new FormData();  
    formData.append('file', fileToUpload, fileToUpload.name);  
      
    this.http.post('https://localhost:44396/api/ApprovalQuality/', formData, {reportProgress: true, observe: 'events'})  
      .subscribe(event => {  
          
        if (event.type === HttpEventType.UploadProgress)  
        {  
         
          this.progress = Math.round(100 * event.loaded / event.total);  
        }  
        else if (event.type === HttpEventType.Response) {  
          this.message = 'Upload success.';  
          this.onUploadFinished.emit(event.body);  
        }  
      });  
  }  

so How to solve this error please ?

Answer 1

Try This..

<div class="col-md-3">  
   <input type="file" #file placeholder="Choose file"  multiple>  
     
   <button type="button" class="btn btn-success" (click)="file.click()">Upload File</button>  
 </div>