Question

I’m using this code
var anchors = document.getElementsByTagName("a");
to detect anchors in HTML document. There are a lot of such tags. But alert(anchors.length) reports 0. It seems strange. Do you know what could be the problem?

I’m using this code in firefox extension

var Highlighter = {

 ...
highlightLinks: function() {
 var anchors = document.getElementsByTagName("a");
 ...
}


window.addEventListener("DOMContentLoaded", function(e) { Highlighter.highlightLinks(); }, false);

thank you

Answer 1

In a Firefox extension, if you add code to the browser via an overlay, then document is the browser document (browser.xul) not the web page’s document. You can get the web page via content.document.