Download PDFs in Cordova InAppBrowser (3.1.0)

Submitted by Julian Pustkuchen on 9. December 2019 - 17:28

My result is now, that inAppBrowser by default isn't capable of handling Downloads at all and doesn't even process links with a file suffix like ".pdf".

a) So one workaround is to open the file in Google Docs by rewriting the link. This works because it's no more a PDF Document, but an external link:
https://docs.google.com/viewer?url=https://www.example.com/yourOnlinePdfDocument.pdf

b) Use the "beforeload" event to decide which browser to use before the link is further processed:

var app = {
[...]
_launchWebApp: function () {
// Set global variables:
// previousUrl = null;
// Open URL in inappbrowser:
var webAppWindow = cordova.InAppBrowser.open(this.config.webAppUrl, '_blank', 'location=no,beforeload=get,zoom=no,toolbar=no,enableViewportScale=yes');
// Register events:
webAppWindow.addEventListener('beforeload', this.onBeforeLoad.bind(this, webAppWindow), false);
},
/**
*
*/
onBeforeLoad: function(webAppWindow, params, callback){
// Special handling of downloads. InAppBrowser doesn't handle them
// so we have to manually preprocess and open in system browser:
if(params.url.match(".pdf")){
cordova.InAppBrowser.open(params.url, '_system');
} else {
// Default handling:
callback(params.url);
}
},

Einordnung:

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Julian Pustkuchen, M. Sc. Wirtschaftsinformatik ist passionierter Software- & Webentwickler mit den Schwerpunkten Softwaredesign, Objektorientierung sowie Usability- & Ablaufoptimierung bei webks. Ein weiterer Schwerpunkt ist die Entwicklung im CMS Drupal.