wkhtmltopdf and the jQuery.ready() function

Question

I've been trying to generate a PDF using the wkhtmltopdf tool (http://wkhtmltopdf.org/). The page from which I want to generate a PDF using jQuery and has some initializations using a jQuery.ready() function, something like this:

jQuery(function() {
    // do something
});

However, when I try to generate a PDF from the page the script is not executed. I've tried setting a delay to wait for the JavaScript to be executed with the option:

--javascript-delay 30000

But the result is the same.

When I've enabled wkhtmltopdf's JavaScript debugging option I get a warning, which I'm not sure if it's related to the problem:

Warning: undefined:0 TypeError: 'null' is not an object

Has anyone encountered this problem? Is there some kind of workaround?

EDIT: Seems the problem is caused by the error Warning: undefined:0 TypeError: 'null' is not an object. I've managed to print the error on the PDF using:

window.onerror = function(error, url, line) {
    $('body').before('<b> Error: ' + error + '</b> <br />');
    $('body').before('<b> Url: ' + url + '</b> <br />');
    $('body').before('<b> Line: ' + line + '</b> <br />');
    console.log(error, ' ', url, ' ', line);
};

But the information is very limited and I have no idea what might cause it:

Error: TypeError: 'null' is not an object
Url: undefined
Line: 0 

Answer 1

The problem turned out to be that Qt doesn't support localStorage, so one of the initialization scripts failed which cause the jQuery.ready() not being executed.

I've managed to debug it with a browser with Qt support: QtWeb. (Tried Arora as well, couldn't run it on my system).