Read content of SP.File object as text using JSOM
<p>as the title suggests, I am trying to read the contents of a simple text file using JSOM. I am using a Sharepoint-hosted addin for this, the file I am trying to read resides on the host web in a document library.</p>

<p>Here's my JS code:</p>

<pre><code>function printAllListNamesFromHostWeb() {
    context = new SP.ClientContext(appweburl);
    factory = new SP.ProxyWebRequestExecutorFactory(appweburl);
    context.set_webRequestExecutorFactory(factory);
    appContextSite = new SP.AppContextSite(context, hostweburl);

    this.web = appContextSite.get_web();
    documentslist = this.web.get_lists().getByTitle('Documents');

    var camlQuery = new SP.CamlQuery();
    camlQuery.set_viewXml('&lt;View&gt;&lt;ViewFields&gt;&lt;FieldRef Name="Name"/&gt;&lt;/ViewFields&gt;&lt;/View&gt;');
    listitems = documentslist.getItems(camlQuery);

    context.load(listitems, 'Include(File,FileRef)');

    context.executeQueryAsync(
        Function.createDelegate(this, successHandler),
        Function.createDelegate(this, errorHandler)
    );

    function successHandler() {
        var enumerator = listitems.getEnumerator();
        while (enumerator.moveNext()) {
            var results = enumerator.get_current();
            var file = results.get_file();

            //Don't know how to get this to work...
            var fr = new FileReader();
            fr.readAsText(file.get);
        }
    }

    function errorHandler(sender, args) {
        console.log('Could not complete cross-domain call: ' + args.get_message());
    }
}
</code></pre>

<p>However, in my succes callback function, I don't know how I can extract the contents of the SP.File object. I tried using the FileReader object from HTML5 API but I couldn't figure out how to convert the SP.File object to a blob. </p>

<p>Can anybody give me a push here? </p>