[英]Identify page finished loading content after page was already finished loading
我需要为 Chrome 编写一个浏览器插件,我想在其中操作某些元素。 操作内容不是问题,但我要操作的页面会在页面加载完成后加载其他内容。
因此,我的脚本更改了内容,但是一旦页面加载了其他内容,它就会重新构建内容并再次覆盖我的更改。
如何跟踪这些更改或其他加载元素?
谢谢
我建议使用setInterval
,它允许您覆盖加载附加内容后所做的任何更改。 或者一个MutationObserver
,它可以让你观察所有传入的变化并相应地进行更新。
设置间隔示例:
setInterval(() => {
// Check to see if your modification is on the page
// If not then re-add it
if (!document.body.innerHTML.includes('<div id="target">')) {
// Call your function to modify the content
yourFunction();
}
// Run every second
}, 1000);
MutationObserver示例:
const observeMutations = (targetNode, baseElm, addedElm, cb) => {
const observer = new MutationObserver((mutationsList) => {
// Iterate through each incoming change to the DOM
for (const mutation of mutationsList) {
const HTML = String(mutation.target.innerHTML);
// Feel free to modify this to fit your use case
// Call function if the base element exists, but your modification does not
if (HTML.includes(baseElm) && !HTML.includes(addedElm)) {
// Call your function to apply to the page
cb();
break;
}
}
});
// Configuration options:
// https://developer.mozilla.org/en-US/docs/Web/API/MutationObserver/observe#parameters
const options = {
attributes: true,
childList: true,
subtree: true,
};
observer.observe(targetNode, options);
// Disconnect observer on a timer for slow loading elements
setTimeout(() => observer.disconnect(), 15000);
};
observeMutations(<your inputs>)
参考
setInverval: https://developer.mozilla.org/en-US/docs/Web/API/WindowOrWorkerGlobalScope/setInterval MutationObserver: https://developer.mozilla.org/en-US/docs/Web/API/MutationObObserver
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