RROR TypeError: Cannot read properties of undefined (reading in angular

Issue

I'm using this function to upload the file

 async uploadFile(file)
  {  
    let promise = new Promise((resolve, reject) => {

     bucket.upload(params, function (err, data) {
     this.file=`<a href='${this.FileName}' target=_blank'>File</a>`; 
     this.send(); 
     resolve(this.FileName);

Calling this.send but getting this error ERROR TypeError: Cannot read properties of undefined reading angular at this.send() line.

Any suggestion to resolve this issue.

Solution

Use arrow function instead of function expression so that upload call back this will point to parent scope.

 bucket.upload(params, (err, data)=> { 
  .......
 });

Answered By - Chellappan வ