How can I obtain hosting XULDocument for a ContentWindow or HTMLDocument within a Firefox extension?

I have a Firefox Extension with a XUL overlay that includes some Javascript with event handlers. One of these event handlers is an EventListener for DOMContentLoaded. I want to load a second overlay only when visiting a specific website.

Here is a snippet of the code I currently have:

var appcontent = document.getElementById("appcontent"); // browser
if (appcontent) appcontent.addEventListener("DOMContentLoaded", onPageLoad, true);

function onPageLoad(event) {
    var doc = event.originalTarget; // doc is the document that triggered the "onload" event
    var win = doc.defaultView;

    if (doc.nodeName != 'document') return; // only documents
    if (win != win.top) return; // only top window
    if (win.frameElement) return; // skip iframes/frames

    if(doc.location.href.search('http://somewebsite.com/') > -1) {
        // Find XULDocument somehow
        //var xulDoc = ??????;
        xulDoc.loadOverlay('chrome://myextension/content/secondoverlay.xul', null);            
    }
}

Is there a way to access the XULDocument hosting the DOM using the data from the DOMContentLoaded event?

javascriptfirefoxfirefox-addonxul

Answer №1

Essentially, the XUL window is synonymous with the global scope represented by window.

Therefore, the following two lines should both work and yield the same result:

window.document.loadOverlay(...);
document.loadOverlay(...);

Nevertheless, this might not be the ideal approach, as the XUL window essentially refers to the main browser.xul which encompasses all content windows. There isn't a separate XUL window for each individual content window! Loading the second overlay will overlay the entire browser window rather than just the specific "tab" (or other element) and will persist even after the tab is closed or navigated away from.

The question then becomes: What is your ultimate goal?

Are you looking to display certain UI elements (such as a toolbar button or menu) only for specific pages? In that case, you would typically overlay all necessary components at once (during the initial load, in the "first" overlay) and simply show/hide the UI as needed based on your criteria. Refer to the Tabbed Browser resource for code snippets related to tab switching and page loading.

Alternatively, if your aim is to manipulate the content window itself, you would typically directly modify the DOM of the content window.

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