MutationObserver - multiply MutationRecords





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I have a chrome extension code that has MutationObserver.



MutationObserver.



when i create event to remove attribute "capturescreenshot" from document.head
and then an event to add "capturescreenshot" back (the events).
the events



the MutationObserver observe this and i got 3 identical MutationRecords mutations array



two for the removing attribute and one for the adding.



so.. i have two questions:



1) why is removing attribute makes two MutationRecord?



2) how can i know by MutationRecord if it refers to adding or removing attribute?



the events:



app.$(document.head).removeAttr("capturescreenshot");
app.$(document.head).attr("capturescreenshot", "{}");


MutationObserver:



bindExtensionEvent: function(eventName, callback) {
var MutationObserver = window.MutationObserver || window.WebKitMutationObserver;
var $observed = $(document.head);
var observer = new MutationObserver(function(mutations, observer) {
// fired when a mutation occurs
mutations.map(function(mutation) {
var attributeName = mutation.attributeName;









share|improve this question

























  • Without a real MCVE (e.g. a working snippet in the question) I can only guess there's a bug in your code or in the browser.

    – wOxxOm
    Nov 25 '18 at 14:34


















0















I have a chrome extension code that has MutationObserver.



MutationObserver.



when i create event to remove attribute "capturescreenshot" from document.head
and then an event to add "capturescreenshot" back (the events).
the events



the MutationObserver observe this and i got 3 identical MutationRecords mutations array



two for the removing attribute and one for the adding.



so.. i have two questions:



1) why is removing attribute makes two MutationRecord?



2) how can i know by MutationRecord if it refers to adding or removing attribute?



the events:



app.$(document.head).removeAttr("capturescreenshot");
app.$(document.head).attr("capturescreenshot", "{}");


MutationObserver:



bindExtensionEvent: function(eventName, callback) {
var MutationObserver = window.MutationObserver || window.WebKitMutationObserver;
var $observed = $(document.head);
var observer = new MutationObserver(function(mutations, observer) {
// fired when a mutation occurs
mutations.map(function(mutation) {
var attributeName = mutation.attributeName;









share|improve this question

























  • Without a real MCVE (e.g. a working snippet in the question) I can only guess there's a bug in your code or in the browser.

    – wOxxOm
    Nov 25 '18 at 14:34














0












0








0








I have a chrome extension code that has MutationObserver.



MutationObserver.



when i create event to remove attribute "capturescreenshot" from document.head
and then an event to add "capturescreenshot" back (the events).
the events



the MutationObserver observe this and i got 3 identical MutationRecords mutations array



two for the removing attribute and one for the adding.



so.. i have two questions:



1) why is removing attribute makes two MutationRecord?



2) how can i know by MutationRecord if it refers to adding or removing attribute?



the events:



app.$(document.head).removeAttr("capturescreenshot");
app.$(document.head).attr("capturescreenshot", "{}");


MutationObserver:



bindExtensionEvent: function(eventName, callback) {
var MutationObserver = window.MutationObserver || window.WebKitMutationObserver;
var $observed = $(document.head);
var observer = new MutationObserver(function(mutations, observer) {
// fired when a mutation occurs
mutations.map(function(mutation) {
var attributeName = mutation.attributeName;









share|improve this question
















I have a chrome extension code that has MutationObserver.



MutationObserver.



when i create event to remove attribute "capturescreenshot" from document.head
and then an event to add "capturescreenshot" back (the events).
the events



the MutationObserver observe this and i got 3 identical MutationRecords mutations array



two for the removing attribute and one for the adding.



so.. i have two questions:



1) why is removing attribute makes two MutationRecord?



2) how can i know by MutationRecord if it refers to adding or removing attribute?



the events:



app.$(document.head).removeAttr("capturescreenshot");
app.$(document.head).attr("capturescreenshot", "{}");


MutationObserver:



bindExtensionEvent: function(eventName, callback) {
var MutationObserver = window.MutationObserver || window.WebKitMutationObserver;
var $observed = $(document.head);
var observer = new MutationObserver(function(mutations, observer) {
// fired when a mutation occurs
mutations.map(function(mutation) {
var attributeName = mutation.attributeName;






mutation-observers mutation-events






share|improve this question















share|improve this question













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edited Nov 25 '18 at 22:04









Navarasu

2,1101924




2,1101924










asked Nov 25 '18 at 11:20









Adi MarsianoAdi Marsiano

1




1













  • Without a real MCVE (e.g. a working snippet in the question) I can only guess there's a bug in your code or in the browser.

    – wOxxOm
    Nov 25 '18 at 14:34



















  • Without a real MCVE (e.g. a working snippet in the question) I can only guess there's a bug in your code or in the browser.

    – wOxxOm
    Nov 25 '18 at 14:34

















Without a real MCVE (e.g. a working snippet in the question) I can only guess there's a bug in your code or in the browser.

– wOxxOm
Nov 25 '18 at 14:34





Without a real MCVE (e.g. a working snippet in the question) I can only guess there's a bug in your code or in the browser.

– wOxxOm
Nov 25 '18 at 14:34












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