Failed to retrieve values from array following the addition of a new element

Does anyone have a solution for this problem? I recently added an element to my array using the push function, but when I tried to access the element at position 3, it wasn't defined properly

   processInput(inputValue: any): void {
    this.numOfImages = inputValue.files.length;
    for (var i = 0; i < inputValue.files.length; i++) {
        let file: File = inputValue.files[i];
        let reader: FileReader = new FileReader();
        reader.onloadend = (e) => {
            if(file.size <= 4000000){
                this.imageValues.push(reader.result);
            }else{
                swal(
                    'Oops! Image size too large',
                    'Some images could not be uploaded as they exceed the maximum size of 5 MB :/',
                    'error'
                );
            }
        }
        reader.readAsDataURL(file);

    }

    this.editImage();

}

editImage(){

    console.log(this.imageValues[3]);

}

Answer №1

Don't let asynchronicity fool you. If you've been encountering issues while calling the editeImage function, it's likely because the necessary data hasn't finished loading yet. To ensure that you have the required data to work with, consider calling your editeImage function within the onloadend method.

analyzeData(inputValue: any): void {
  this.imageCount = inputValue.files.length;
  for (var i = 0; i < inputValue.files.length; i++) {
    let file: File = inputValue.files[i];
    let reader: FileReader = new FileReader();
    reader.onloadend = (e) => {
      if(file.size <= 4000000){
        this.imageValues.push(reader.result);
        if(this.imageValues.length === 4) this.editImage();
      }else{
        swal(
          'Oops! Image too large',
          'Some images could not be sent as they exceed the maximum size of 5 Megabytes :/',
          'error'
        );
      }
    }
    reader.readAsDataURL(file);

  }

}

editImage(){ 
    console.log(this.imageValues[3]); 
}

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