How to parse xml in Angular 2

Question

I'm using an API that uses XML instead of JSON. Any suggestions on how to convert the following XML to JSON or how to properly use the data in an ngFor directive?

Also, would an observable be appropriate here?

<case-file>
  <serial-number>123456789</serial-number>
    <transaction-date>20150101</transaction-date>
      <case-file-header>
       <filing-date>20140101</filing-date>
      </case-file-header>
 // ...
   <classifications>
  <classification>
   <international-code-total-no>1</international-code-total-no>
   <primary-code>025</primary-code>
  </classification>
 </classifications>
 </case-file>
 <case-file>
     <serial-number>234567890</serial-number>
    <transaction-date>20160401</transaction-date>
      <case-file-header>
       <filing-date>20160401</filing-date>
      </case-file-header>
//...
   <classifications>
  <classification>
   <international-code-total-no>1</international-code-total-no>
   <primary-code>042</primary-code>
  </classification>
 </classifications>
</case-file>

---

export class apiService {
   constructor (private http: Http) {}

   private _apiUrl = 'app/api';  

   getCaseFile () {
     return this.http.get(this._apiUrl)
//conversion to JSON here?
                    .map(res => <CaseFile[]> res.json().data)
                     .catch(this.handleError);
   }
    private handleError (error: Response) {

     console.error(error);
    return Observable.throw(error.json().error || 'Server error');
   }
 }

<div *ngFor="#cf of case-file">{{case-file.serial-number}}</div>

Answer 1

Based on the library http://goessner.net/download/prj/jsonxml/, I implemented a sample to receive XML data and parse them into an Angular2 application:

var headers = new Headers();
(...)
headers.append('Accept', 'application/xml');

return this.http.get('https://angular2.apispark.net/v1/companies/', {
  headers: headers
}).map(res => JSON.parse(xml2json(res.text(),'  ')));

To be able to use the library, you need to parse first the XML string:

var parseXml;

if (typeof window.DOMParser != "undefined") {
  parseXml = function(xmlStr) {
    return ( new window.DOMParser() ).parseFromString(xmlStr, "text/xml");
  };
} else if (typeof window.ActiveXObject != "undefined" &&
   new window.ActiveXObject("Microsoft.XMLDOM")) {
    parseXml = function(xmlStr) {
      var xmlDoc = new window.ActiveXObject("Microsoft.XMLDOM");
      xmlDoc.async = "false";
      xmlDoc.loadXML(xmlStr);
      return xmlDoc;
  };
} else {
  throw new Error("No XML parser found");
}

See this question:

• Parse XML using JavaScript

See this plunkr: https://plnkr.co/edit/dj63ASQAgrNcLLlwyAum?p=preview.