javascript - CKEDITOR remove element event -

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i using ckeditor text, , want limited number of embed ( video , pictures ) can upload user, mean need count there, problem don't know count when video or picture delete white backspace. trying many way catch event change , key event key not track when press backspacing , remove element. , event change not see element removed or make comparation between actual data , previous data. try find undo implemented don't found.

if have ideea can track when remove element please me.

i found combination between change , beforecommandexec count number of oembed class , number of img tag, don't know if best practice moment posibility count elements.


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