Utilizing JavaScript to access and parse an XML file within a client-side environment

I've recently started learning JavaScript and I'm facing some challenges while trying to reference an xml file uploaded by a user.

My goal is to eventually parse the XML contents, update them, and allow users to download the modified file.

Here's a snippet from my HTML file:

<div ng-controller = "myCtrl">
    <input type="file" file-model="myFile"/>
    <button ng-click="uploadFile()">Upload for Reading</button>
</div>

In controller.js:

myApp.controller('myCtrl', ['$scope', 'fileUpload', function($scope, fileUpload){    
    $scope.uploadFile = function(){
        var file = $scope.myFile;
        console.log('file is ' + JSON.stringify(file));

        parser=new DOMParser();
        var xmlDoc=parser.parseFromString(file,"text/xml");
        var length=xmlDoc.length;
        console.log(length);

Result: file is {"name":"books.xml","lastModifiedDate":"2014-08-26T16:20:03.685Z","size":818,"type":"text/xml"}

length xmlDoc.length:undefined

However, it seems that xmlDoc.length is undefined in the result above.

Your assistance would be greatly appreciated.

Answer №1

If you want to work with xml data in angular, one option is to utilize the XML to Javascript mapping library (x2js). Here are the steps you can take:

  1. First, install the X2JS library from the provided link.
  2. Next, create a personalized factory that can convert xml to json and vice versa.

    angular.factory('xmlParser', function() { 
      var x2js = new X2JS();
       return {
         xml2json: x2js.xml2json,
         json2xml: x2js.json2xml_str
       }
    });
    
  3. Lastly, establish a transformeRequest interceptor within your $http request to change your file data to json before transmitting it.

     angular.factory('Data', [$http, 'xmlParser',
        function($http, xmlParser) {
           $http.post('/api/msgs.xml', data, {
           transformRequest: function(data) {
              return xmlParser.xml2json(data);
           }
        })
      });
    

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