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How to write a mutation observer js

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0xTony143 answered on September 1, 2021 Popularity 9/10 Helpfulness 1/10

answer How to write a mutation observer js

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How to write a mutation observer js

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let mList = document.getElementById('myList'),
            options = {
                childList: true,
                attributes: true,
                subtree: true
            },
            observer = new MutationObserver(mCallback);

        function mCallback(mutations) {
            for (let mutation of mutations) {
                // If you remove a child from the container you are watching
                if (mutation.type === 'childList') {
                    console.log('Mutation Detected: A child node has been added or removed.');
                }
                // If you use setAttribute to add a class or ID to an element
                if (mutation.type === 'attributes') {
                    console.log('Mutation Detected: An attribute has been added or removed.');
                }

                if (mutation.type === 'subtree') {
                    console.log('Mutation Detected: A subtree has been added or removed.');
                }
            }
        }

observer.observe(mList, options);

Popularity 9/10 Helpfulness 1/10 Language javascript

Source: Grepper

Tags: javascript mutation

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Contributed on Sep 03 2021

0xTony143

0 Answers Avg Quality 2/10

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mutation observer js

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const observer = new MutationObserver(list => {
    console.log('mutation list', list);
});
observer.observe(document.body, {
    attributes: true,
    childList: true,
    subtree: true
});
// perform any DOM change action in your page. e.g. show/hide/remove

Popularity 10/10 Helpfulness 6/10 Language javascript

Source: Grepper

Tags: javascript j

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Contributed on Sep 01 2021

0xTony143

0 Answers Avg Quality 2/10

How to write a mutation observer js

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