Error on Android WebView: 'console' is undefined

While attempting to open an HTML file with JavaScript in an Android Webview, I encountered an error after implementing the onConsoleMessage of my WebChromeClient:

Uncaught ReferenceError: console is not defined -- From line 10 of file:///storage/sdcard0/TargetApp/e184bae3-5824-4e23-a26e-820ce6d32aa2/pres/fce4da510de8431bB3eeD5bdbd1c695d/fce4da510de8431bB3eeD5bdbd1c695d/html/js/target/util_Q_3bb82a6eabd3339d91ca15cb4fd6685c.js

Here is line 10 of my file:

console = console ? console : { log : function() {}, debug : function() {}};

Curiously, this code works fine on browsers and iOS webview.

If anyone has any insights into what might be causing this issue, please share them.

javascriptandroidwebviewandroid-webview

Answer №1

Apologies everyone, unfortunately my code example was missing some crucial information. The issue stemmed from JavaScript setting the Strict Mode.

(function($) {

    'use strict';

    /* 
     * 
     */
    jQuery.ajaxSettings.traditional = true;

    console = console ? console : { log : function() {}, debug : function() {}}; 

    window.c = console;

/*
* ...
*/

The specifications state:

In strict mode, using undeclared variables is not allowed.

Therefore, the correct approach is:

var console = window.console = window.console ? window.console : { log : function() {}, debug : function() {}};

The only unresolved question is why it works in other browsers such as Chrome, Firefox, and iOS.

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