appendChild in a XUL Firefox addon breaks
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06-07-2019 - |
Question
I am working on a Firefox addon and I currently need to dynamically add menuitems to a menupopup element. I have tried basically all of the approaches on the Mozilla Developer Center and none of them work.
function populateDropdown() {
var counter = 0;
for (var key in services) {
var newMenuItem = document.createElementNS("http://www.mozilla.org/keymaster/gatekeeper/there.is.only.xul", "menuitem");
newMenuItem.setAttribute("label", services[key]['title'])
document.getElementById("mainDropdown").appendChild(newMenuItem);
}
}
This code breaks at the appendChild command. Any ideas why?
Solution
Are you 100% positive that document.getElementById("mainDropdown") is returning a non-null result?
Try breaking it down into pieces, and add some debugging code to follow-along:
var dropDown = document.getElementById("mainDropdown");
if(dropDown) {
alert("dropDown found!");
dropDown.appendChild(newMenuItem);
}
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