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How to get file content and other details in AngularJS?

  • Difficulty Level : Easy
  • Last Updated : 14 Aug, 2020
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We can get the file content by using some basic angular functions and other details like the name and size of the file in AngularJS. To understand it look into the below example where both HTML and JS files are implemented.

Note: Consider below two files are of same component in angular.

app.module.html:




<!-- Script for display 
data in particular format -->
  
<!DOCTYPE html> 
<html>
<script src=
  </script
<body ng-app="myApp">
    <div ng-controller="MyCtrl">
        <input type="file" id="myFileInput" />
        <button ng-click="submit()"> Submit</button>
        <br /><br />
        <h1>
            Filename: {{ fileName }}
        </h1>
        <h2>
            File size: {{ fileSize }} Bytes
        </h2>
        <h2>
            File Content: {{ fileContent }}
        </h2>
    </div>
</body>
</html>

Output:

In the above HTML file we have simply made a structure to how it should be looked on the webpage. For that, we have used some angular stuff like ‘ng-controller’ and also doubly curly brackets which we will implement in the below javascript code.



app.module.ts:




import { BrowserModule } from 
        '@angular/platform-browser'
import { NgModule } from '@angular/core'
import { AppComponent } from './app.component'
import { BrowserAnimationsModule } from 
        '@angular/platform-browser/animations'
import { FormsModule, ReactiveFormsModule } 
        from '@angular/forms'
import { MatInputModule } from 
        '@angular/material/input'
import { MatDialogModule } from 
        '@angular/material/dialog'
import { MatFormFieldModule } from 
        '@angular/material/form-field'
import { MatIconModule } from 
        '@angular/material/icon'
  
@NgModule({ 
    declarations: [ 
        AppComponent, 
    ], 
    imports: [ 
        BrowserModule, 
        FormsModule, 
        BrowserAnimationsModule, 
        MatInputModule, 
        MatFormFieldModule, 
        MatIconModule, 
        MatDialogModule, 
    ], 
    bootstrap: [AppComponent] 
}) 
export class AppModule { } 

app.component.ts:




// Code to get file content
// and other data
import { Component, OnInit }  
        from '@angular/core'
    
// Imports 
import { FormGroup, FormControl,
          } from '@angular/forms';
  
@Component({ 
    selector: 'app-root'
    templateUrl: './app.component.html'
    styleUrls: ['./app.component.scss'
}) 
export class AppComponent implements OnInit { 
    
    constructor() { } 
    
    ngOnInit() { 
    }
  
    var myApp = angular.module('myApp', []);
  
    myApp.controller('MyCtrl', function ($scope) {
  
        // Intially declaring empty string 
        // and assigning size to zero 
  
        $scope.fileContent = '';
        $scope.fileSize = 0;
        $scope.fileName = '';
  
        // Implementing submit function 
  
        $scope.submit = function () {
            var file = document.getElementById("myFileInput")
                                          .files[0];
            if(file) {
                var Reader = new FileReader();
                Reader.readAsText(file, "UTF-8");
                Reader.onload = function (evt) {
  
                    // Getting required result 
                    // of the file
  
                    $scope.fileContent = Reader.result;
                    $scope.fileName = document.getElementById(
                                     "myFileInput").files[0].name;
                    $scope.fileSize = document.getElementById(
                                      "myFileInput").files[0].size;;
                }
  
       // Printing error if data 
       //is not proper 
  
            Reader.onerror = function (evt) {
                $scope.fileContent = "error";
            }
          }
       }
    }
});

Output:




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