How to preview picture stored in the fake path in Angular 2/Typescript?

问题

Browsers don't take full path of local disc, instead they concatenate the filename with fakepath. Is there any way to access the file (image) from fakepath using typescript or angular 2?

I have this:

<img src="{{path}}" />

where my path variable stores the 'fakepath':"C:\fakepath\pic.jpg" in my .ts file.

Edit This question discusses the way to preview image file from fakepath using javascript. If it is possible with Js, then is it not the same in case of ts?

回答1:

This should do what you want:

<input type='file' (change)="readUrl($event)">
<img [src]="url">

readUrl(event:any) {
  if (event.target.files && event.target.files[0]) {
    var reader = new FileReader();

    reader.onload = (event: ProgressEvent) => {
      this.url = (<FileReader>event.target).result;
    }

    reader.readAsDataURL(event.target.files[0]);
  }
}

回答2:

Adding to @GünterZöchbauer answer, this wasn't working for me until I added this:

reader.onload = function(e:any){
   this.url = e.target.result;
}

Prior to adding 'any', I was getting the error:

property 'result' does not exist on type 'eventtarget'

回答3:

It works when you change the event to type of any. In that way, Angular can access any of its property.

readUrl(event) {
if (event.target.files && event.target.files[0]) {
  var reader = new FileReader();

  reader.onload = (event:any) => {
    this.url = event.target.result;
  }

  reader.readAsDataURL(event.target.files[0]);
}

}

回答4:

It's working

example.component.html

<input type="file" (change)="onFileChanged($event)" required />
<img [src]="imageShow" height="200"> <br/>

example.component.ts

imageShow: any= '';
onFileChanged(event) {
  this.file = event.target.files[0]
  var reader = new FileReader();
  reader.readAsDataURL(event.target.files[0]);
  reader.onload = (event) => {
   this.imageShow = (<FileReader>event.target).result;
 }

}

来源：https://stackoverflow.com/questions/39074806/how-to-preview-picture-stored-in-the-fake-path-in-angular-2-typescript

标签

angular

typescript

image-uploading