Create an array by extracting data from the chosen CSV file using the file input type

Question

Create an array by extracting data from the chosen CSV file using the file input type

I am looking to utilize AngularJS to read and store the data from a CSV file that is uploaded using an input type file.

My approach involves leveraging AngularJS with an input type file to handle CSV, xls, or xlsx files in the following manner:

HTML:

<input class="btn btn-default col-xs-6" type="file" accept=".csv, application/vnd.openxmlformats-officedocument.spreadsheetml.sheet, application/vnd.ms-excel" onchange="angular.element(this).scope().checkFormat(this.files)">

JavaScript/AngularJS:

$scope.checkFormat = function(files) {
        var fd = new FormData();
        //Take the first selected file
        fd.append("file", files[0]);
}

What is the best way for me to iterate through this CSV file row by row and add each row into an array?

javascript angularjs csv xls input-type-file

Answer 1

Answer №1

If you want to streamline the process, creating a custom directive is the way to go. Let's name it csvUpload and utilize it like this:

<csv-upload ng-model="myData">

. This approach promotes reusability and saves you from duplicating the logic in multiple controllers. It's not only efficient but also convenient - with just a few clicks, your data will be readily available on $scope.myData :)

Here's how I tackled it:

(For converting CSV to JSON, I rely on the reputable https://github.com/mholt/PapaParse library. Although manual parsing is an option, I wouldn't recommend going down that path ;)

.directive('csvUpload', function () {
  return {
    restrict: 'E',
    template: '<input type="file" onchange="angular.element(this).scope().handleFiles(this.files)">',
    require: 'ngModel',
    scope: {},
    link: function (scope, element, attrs, ngModel) {
      scope.handleFiles = function (files) {
        Papa.parse(files[0], {
          dynamicTyping: true,
          complete: function(results) {
            // Additional data transformations can be performed here if needed
            // ...
            ngModel.$setViewValue(results);
          }
        });
      };

    }
  };
});

Answer 2

If you want to streamline the process, creating a custom directive is the way to go. Let's name it csvUpload and utilize it like this:

<csv-upload ng-model="myData">

. This approach promotes reusability and saves you from duplicating the logic in multiple controllers. It's not only efficient but also convenient - with just a few clicks, your data will be readily available on $scope.myData :)

Here's how I tackled it:

(For converting CSV to JSON, I rely on the reputable https://github.com/mholt/PapaParse library. Although manual parsing is an option, I wouldn't recommend going down that path ;)

.directive('csvUpload', function () {
  return {
    restrict: 'E',
    template: '<input type="file" onchange="angular.element(this).scope().handleFiles(this.files)">',
    require: 'ngModel',
    scope: {},
    link: function (scope, element, attrs, ngModel) {
      scope.handleFiles = function (files) {
        Papa.parse(files[0], {
          dynamicTyping: true,
          complete: function(results) {
            // Additional data transformations can be performed here if needed
            // ...
            ngModel.$setViewValue(results);
          }
        });
      };

    }
  };
});

Answer 3

Answer №2

** The beauty of HTML

**

<input type="file" name="datasource_upload" accept="application/vnd.ms-excel, application/pdf,.csv" ngf-max-size="2MB" (change)="csv2Array($event)">

**

Journey into Typescript code

**

    csv2Array(fileInput: any){
//fetching file from input
this.fileReaded = fileInput.target.files[0];

let reader: FileReader = new FileReader();
reader.readAsText(this.fileReaded);

reader.onload = (e) => {
  let csv: string = reader.result;
  let allTextLines = csv.split(/\r|\n|\r/);
  let headers = allTextLines[0].split(',');
  let lines = [];

  for (let i = 0; i < allTextLines.length; i++) {
    // splitting content based on comma
    let data = allTextLines[i].split(',');
    if (data.length === headers.length) {
      let tarr = [];
      for (let j = 0; j < headers.length; j++) {
        tarr.push(data[j]);
      }

      // display each row to review output 
      console.log(tarr);
      lines.push(tarr);
    }
  }
  // check out all rows in the csv file 
  console.log(">>>>>>>>>>>>>>>>>", lines);
} }

Answer 4

** The beauty of HTML

**

<input type="file" name="datasource_upload" accept="application/vnd.ms-excel, application/pdf,.csv" ngf-max-size="2MB" (change)="csv2Array($event)">

**

Journey into Typescript code

**

    csv2Array(fileInput: any){
//fetching file from input
this.fileReaded = fileInput.target.files[0];

let reader: FileReader = new FileReader();
reader.readAsText(this.fileReaded);

reader.onload = (e) => {
  let csv: string = reader.result;
  let allTextLines = csv.split(/\r|\n|\r/);
  let headers = allTextLines[0].split(',');
  let lines = [];

  for (let i = 0; i < allTextLines.length; i++) {
    // splitting content based on comma
    let data = allTextLines[i].split(',');
    if (data.length === headers.length) {
      let tarr = [];
      for (let j = 0; j < headers.length; j++) {
        tarr.push(data[j]);
      }

      // display each row to review output 
      console.log(tarr);
      lines.push(tarr);
    }
  }
  // check out all rows in the csv file 
  console.log(">>>>>>>>>>>>>>>>>", lines);
} }

Create an array by extracting data from the chosen CSV file using the file input type

Answer №1

Answer №2

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