What methods can be used to verify that window.print() has not been overridden?

Is there a way to verify if the window.print() method is overridden using JavaScript and/or FirefoxDriver?

You can prevent all print buttons on a page from functioning like this:

window.print = function() { alert("Bazinga") }

When this is implemented, a normal "Print" link such as the one below will no longer work:

<a onclick="window.print()">....</a>

I am looking for a way to confirm whether a window.print() call triggers the original print dialog.

Perhaps injecting some JavaScript into the FirefoxWebdriver could provide a solution?

javascriptseleniumwebdriverselenium-firefoxdriver

Answer №1

One way to determine if the window.print function is native in JavaScript is by checking its toString method:

if( window.print.toString().indexOf('[native code]') > -1 ) {
 // It's a native function
}

Answer №2

I have crafted a code snippet inspired by Luca's solution and Christoph's input. This function is designed to identify the native print dialog, even in older browsers like IE6.

function detectNativePrintDialog() {
    var isNative = false;
    try {
        if (window.print.toString().indexOf('[native code]') > -1) isNative = true;
    } catch (e) {
        isNative = true;
    }
    return isNative;
}

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