Mutation Observer is undefined
internet-explorer-11, javascript, jquery, mutation-observers, netsuite
Solution
That method was added in IE11, therefore it won't be available if the browser is running in compatibility mode for anything other than IE11.
http://msdn.microsoft.com/en-us/library/ie/dn265034(v=vs.85).aspx
Problem
I am attempting to fix and issue with my code. I was originally using DOMNodeRemoved and DOMNodeInserted for keeping an eye on an element within a page I am working on. They worked well but did not function in IE. So I started trying to work with a MutationObserver. Here is my Code it's called on onPageInit(the callback writes to the console but I disabled it since IE no longer supports console): ``` var callback = function(allmutations){ allmutations.map( function(mr){ var mt = 'Mutation type: ' + mr.type; // log the type of mutation mt += 'Mutation target: ' + mr.target; // log the node affected. //console.log( mt ); }) } mo = new MutationObserver(callback), options = { // required, and observes additions or deletion of child nodes. 'childList': true, // observes the addition or deletion of "grandchild" nodes. 'subtree': true } alert('its alive'); mo.observe(document.body, options); ``` It works fine in chrome, however for some reason falls flat in IE. I get a message box during load of the page that says : ``` An unexpected error occurred in a script running on this page. onPageInit(pageInit) scriptname JS_EXCEPTION TypeError 'MutationObserver' is undefined ``` Am I doing something wrong? Additional info: Page is a netsuite page, running jQuery 1.7.2 (if it matters)