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improvement: use mutation observer to replace mutation events when available #34

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improvement: use mutation observer to replace mutation events when available #34

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0a3a763
add mutation observer support
YongYuH Nov 6, 2018
580d7c5
extract logic of DOM node insert listener
YongYuH Nov 7, 2018
7f55593
Merge pull request #2 from YongYuH/improvement/dom-mutation
YongYuH Nov 7, 2018
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80 changes: 66 additions & 14 deletions src/MessengerCustomerChat.js
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Original file line number Diff line number Diff line change
Expand Up @@ -10,6 +10,69 @@ const removeElementByIds = ids => {
});
};

/**
* Use MutationObserver or DOMNodeInserted event to check if the fb_dialog DOM is loaded.
* If it is loaded, call parameter function `callback`.
* @param {function} callback
*/
const addDOMNodeListenerOfFacebookPlugin = callback => {
// check compatibility of MutationObserver
const MutationObserver =
window.MutationObserver ||
window.WebKitMutationObserver ||
window.MozMutationObserver;
if (MutationObserver) {
// create an observer instance
const observer = new MutationObserver((mutations, observerSelf) => {
mutations.forEach(mutation => {
if (
mutation.target.id === 'fb-root' &&
mutation.addedNodes.length > 0
) {
const { addedNodes } = mutation;
addedNodes.forEach(element => {
if (
element &&
element.className &&
typeof element.className === 'string' &&
element.className.includes('fb_dialog')
) {
callback();
observerSelf.disconnect();
}
});
}
});
});
// select the target node
const target = document.querySelector('body');
// configuration of the observer:
const config = { childList: true, subtree: true };

// pass in the target node, as well as the observer options
observer.observe(target, config);
} else if (document.body.addEventListener) {
document.addEventListener(
'DOMNodeInserted',
event => {
const element = event.target;
if (
element.className &&
typeof element.className === 'string' &&
element.className.includes('fb_dialog')
) {
callback();
}
},
false
);
} else {
console.warn(
'MutationObserver and addEventListener are not supported! Callback function of addDOMNodeListenerOfFacebookPlugin would not work.'
);
}
};

export default class MessengerCustomerChat extends Component {
static propTypes = {
pageId: PropTypes.string.isRequired,
Expand Down Expand Up @@ -204,20 +267,9 @@ export default class MessengerCustomerChat extends Component {
const { fbLoaded, shouldShowDialog } = this.state;

if (fbLoaded && shouldShowDialog !== this.props.shouldShowDialog) {
document.addEventListener(
'DOMNodeInserted',
event => {
const element = event.target;
if (
element.className &&
typeof element.className === 'string' &&
element.className.includes('fb_dialog')
) {
this.controlPlugin();
}
},
false
);
addDOMNodeListenerOfFacebookPlugin(() => {
this.controlPlugin();
});
this.subscribeEvents();
}
// Add a random key to rerender. Reference:
Expand Down