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Javascript errors in Ionic app deployed on ios

Posted on 2016-08-07
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Last Modified: 2016-09-20
I am working on an Ionic app. When testing in the browser (on laptop), Chrome developer tools provide a great way to debug using console.log. It also shows Javascript errors in the browser console.

However, once the app is deployed on iPad (using xcode) the browser console is no longer visible. How can I see the statements printed using console.log and Javascript errors, if any.

Some actions in my Ionic app are not responding after the app is deployed on iPad. I think there might be some Javascript errors being thrown but I am not able to find what they are.
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Question by:ank5
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Assisted Solution

by:Julian Hansen
Julian Hansen earned 250 total points
ID: 41746822
The following might be of use

Firebug lite for Mobile you can find it here

https://getfirebug.com/firebuglite_mobile

Waterbug for Safari - you can get it on GitHub here

https://github.com/robotnic/waterbug

Another option is to build a debug window in your app that is activated by some internal state variable. I usually have a pull down pane that appears as a handle in the top right of the screen. Anything I want to see going on either on the server or in the console I log to that window using JavaScript. The presence of the handle is activated by a URL parameter or a server side variable.

You redefine your console.log function to send to a div like so
if (typeof console  != "undefined") {
  if (typeof console.log != 'undefined') {
  console.clog = console.log;
  }
  else {
  console.clog = function() {};
  }
}

console.log = function(d) {
  console.clog(d);
  $('#debug-pane ul').append($('<li/>').html(d).addClass('list-group-item'));
};
  
//console.error = console.debug = console.info =  console.log;

window.onerror = function(message, url, linenumber) {
  console.log("JavaScript error: " + message + " on line " +
    linenumber + " for " + url);
}

Open in new window


Here is a working sample demonstrating the concept.
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Accepted Solution

by:
ank5 earned 250 total points
ID: 41747608
Below post solved the problem -

http://phonegap-tips.com/articles/debugging-ios-phonegap-apps-with-safaris-web-inspector.html

I am now able to view console logs and Javascript errors in Safari console
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