working with CSV files in JavaScript using AngularJS

Question

working with CSV files in JavaScript using AngularJS

Currently, I am working on building a simple angular application that can parse CSV input and populate a table with the extracted data.

If you're curious about what I'm trying to accomplish, feel free to check out this Plunker demo - http://plnkr.co/edit/6QFT4AcV4KpiSG23EdOS

Essentially, my goal is to have a <textarea> where users can paste CSV data, which will then be used to populate the table below.

<div class="excelArea">
    <textarea name="excelData" ng-model="excelData"></textarea>
</div>

Here is the current JavaScript code I have written, but I'm encountering difficulties with: 1. Extracting the email address from the name 2. Updating the $scope.inviteList; with the parsed data

app.controller("InviteController", function($scope) {

    //Initialize objects
    $scope.excelData = "";
    $scope.errorMessage = "";
    $scope.inviteList = [];

    $scope.$watch("excelData", function() {

        var lines, lineNumber, data, length;

        lines = $scope.excelData.match(/[^\r\n]+/g);
        lineNumber = 0;

        for (var i = lines.length - 1; i >= 0; i--) {

            l = lines[i];
            lineNumber++;
            data = l.split(/\t/);

            var email = ? ? ?
            var name = ? ? ?

            $scope.inviteList.push({
                name: name,
                email: email,
                status: "not sent"
            });

        };

    });

});

Just some basic details:

The CSV format will consist of two columns (name, email) and will be structured like this:

John Thompson,<a href="/cdn-cgi/l/email-protection" class="__cf_email__" data-cfemail="e58f8a8d8ba5918d8a8895968a8bcb868a88">[email protected]</a>
Robin Peters, <a href="/cdn-cgi/l/email-protection" class="__cf_email__" data-cfemail="abd9c4c9c2c5ebdbcedfced9d885c8c4c6">[email protected]</a>
Bill Bob, <a href="/cdn-cgi/l/email-protection" class="__cf_email__" data-cfemail="7113181d1d31131e135f121e1c">[email protected]</a>

javascript angularjs csv

Answer 1

Answer №1

There are several issues in your code:

Instead of using regex, you can simply split the input string for easier processing.
The structure of your HTML is incorrect - td should be nested inside tr.
Make sure to clear your array before adding new elements to it.
Ensure that variables used inside ng-repeat are properly scoped and defined.
Avoid using unscoped variables whenever possible.

When splitting a string, access its parts using their respective indexes.

Here is the corrected code:

JS

$scope.$watch("excelData", function() {
    var lines, lineNumber, data, length;
    $scope.inviteList = [];
    lines = $scope.excelData.split('\n');
    lineNumber = 0;
    for (var i = lines.length - 1; i >= 0; i--) {
        l = lines[i];

        lineNumber++;
        data = l.split(',');

        var name = data[0];
        var email = data[1];

        $scope.inviteList.push({
            name: name,
            email: email,
            status: "not sent"
        });
    }
});

HTML

  <table>
    <tr>
      <th>Name</th>
      <th>Email</th>
      <th>Status</th>
    </tr>
    <tr ng-repeat="i in inviteList">
      <td>{{i.name}}</td>
      <td>{{i.email}}</td>
      <td>{{i.status}}</td>
    </tr>
  </table>

There is still room for improvement in your code, especially in the JS part. I recommend exploring more documentation and tutorials.

Here is a link to a plunker with your updated code: Plunker.

Answer 2

There are several issues in your code:

Instead of using regex, you can simply split the input string for easier processing.
The structure of your HTML is incorrect - td should be nested inside tr.
Make sure to clear your array before adding new elements to it.
Ensure that variables used inside ng-repeat are properly scoped and defined.
Avoid using unscoped variables whenever possible.

When splitting a string, access its parts using their respective indexes.

Here is the corrected code:

JS

$scope.$watch("excelData", function() {
    var lines, lineNumber, data, length;
    $scope.inviteList = [];
    lines = $scope.excelData.split('\n');
    lineNumber = 0;
    for (var i = lines.length - 1; i >= 0; i--) {
        l = lines[i];

        lineNumber++;
        data = l.split(',');

        var name = data[0];
        var email = data[1];

        $scope.inviteList.push({
            name: name,
            email: email,
            status: "not sent"
        });
    }
});

HTML

  <table>
    <tr>
      <th>Name</th>
      <th>Email</th>
      <th>Status</th>
    </tr>
    <tr ng-repeat="i in inviteList">
      <td>{{i.name}}</td>
      <td>{{i.email}}</td>
      <td>{{i.status}}</td>
    </tr>
  </table>

There is still room for improvement in your code, especially in the JS part. I recommend exploring more documentation and tutorials.

Here is a link to a plunker with your updated code: Plunker.

Answer 3

Answer №2

To efficiently manage and manipulate data in various parts of my application, I would implement a filter for parsing the data. Here's how it works:

app.controller('MainCtrl', function($scope, $filter) {
  $scope.data = 'John Thompson,<a href="/cdn-cgi/l/email-protection" class="__cf_email__" data-cfemail="6a000502042a1e0205071a19050444090507">[email protected]</a>\nRobin Peters, <a href="/cdn-cgi/l/email-protection" class="__cf_email__" data-cfemail="41332e23282f013124352433326f222e2c">[email protected]</a>\nBill Bob, <a href="/cdn-cgi/l/email-protection" class="__cf_email__" data-cfemail="3b595257577b59545915585456">[email protected]</a>';

  $scope.$watch('data', function(val){
    $scope.inviteList = $filter('csvToObj')(val);
  });
});

app.filter('csvToObj', function() {
  return function(input) {
    var rows = input.split('\n');
    var obj = [];
    angular.forEach(rows, function(val) {
      var o = val.split(',');
      obj.push({
        name: o[0],
        email: o[1],
        status: "not sent"
      });
    });
    return obj;
  };
});

Check out a Demo:http://plnkr.co/edit/SOtMMLft3amlVm4RROd0?p=preview

Answer 4

To efficiently manage and manipulate data in various parts of my application, I would implement a filter for parsing the data. Here's how it works:

app.controller('MainCtrl', function($scope, $filter) {
  $scope.data = 'John Thompson,<a href="/cdn-cgi/l/email-protection" class="__cf_email__" data-cfemail="6a000502042a1e0205071a19050444090507">[email protected]</a>\nRobin Peters, <a href="/cdn-cgi/l/email-protection" class="__cf_email__" data-cfemail="41332e23282f013124352433326f222e2c">[email protected]</a>\nBill Bob, <a href="/cdn-cgi/l/email-protection" class="__cf_email__" data-cfemail="3b595257577b59545915585456">[email protected]</a>';

  $scope.$watch('data', function(val){
    $scope.inviteList = $filter('csvToObj')(val);
  });
});

app.filter('csvToObj', function() {
  return function(input) {
    var rows = input.split('\n');
    var obj = [];
    angular.forEach(rows, function(val) {
      var o = val.split(',');
      obj.push({
        name: o[0],
        email: o[1],
        status: "not sent"
      });
    });
    return obj;
  };
});

Check out a Demo:http://plnkr.co/edit/SOtMMLft3amlVm4RROd0?p=preview

Answer 5

Answer №3

When a string is split, the resulting output is an array. It's important to know how to access specific indexes within the data array:

app.controller("RegisterController", function($scope) {

    //Initialize variables
    $scope.inputData = "";
    $scope.errorMessage = "";
    $scope.userList = [];

    $scope.$watch("inputData", function() {

        var lines, lineNum, data, length;

        lines = $scope.inputData.match(/[^\r\n]+/g);
        lineNum = 0;

        for (var j = 0; j < lines.length; j++) {

            var line = lines[j];
            lineNum++;
            data = line.split(/\t/);

            var username = data[0];
            var password = data[1];

            $scope.userList.push({
                username: username,
                password: password,
                loggedIn: false
            });

        };

    });

});

Answer 6

When a string is split, the resulting output is an array. It's important to know how to access specific indexes within the data array:

app.controller("RegisterController", function($scope) {

    //Initialize variables
    $scope.inputData = "";
    $scope.errorMessage = "";
    $scope.userList = [];

    $scope.$watch("inputData", function() {

        var lines, lineNum, data, length;

        lines = $scope.inputData.match(/[^\r\n]+/g);
        lineNum = 0;

        for (var j = 0; j < lines.length; j++) {

            var line = lines[j];
            lineNum++;
            data = line.split(/\t/);

            var username = data[0];
            var password = data[1];

            $scope.userList.push({
                username: username,
                password: password,
                loggedIn: false
            });

        };

    });

});

working with CSV files in JavaScript using AngularJS

Answer №1

Answer №2

Answer №3

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