setMutationHandler

MutationObserver wrapper to wait for the specified CSS selector

此脚本不应直接安装。它是供其他脚本使用的外部库，要使用该库请加入元指令 // @require https://update.gf.qytechs.cn/scripts/12228/175122/setMutationHandler.js

提问、发表评价或者举报此脚本。

作者: woxxom
版本: 3.0.2
创建于: 2015-09-05
更新于: 2017-02-14
大小: 3.1 KB
许可证: 暂无

A MutationObserver wrapper to wait for an element (or elements) with the specified CSS selector.

First, load the function in your script metablock:

..............
// @require       https://gf.qytechs.cn/scripts/12228/code/setMutationHandler.js
..............
// ==/UserScript==

Watch for added nodes:

setMutationHandler(document, '.container p.some-child', nodes => {
    nodes.forEach(node => node.style.display = 'none');
    return false; // disconnect the observer, this is useful for one-time jobs
});

The observation target parameter may be omitted so "document" will be used by default:
```
setMutationHandler('.container p.some-selector', nodes => { ...... });
```

Options form:

setMutationHandler({
    processExisting: true, // Process existing elements and watch for mutations from now on
    selector: '.container p.some-child',
    handler: nodes => nodes.forEach(node => node.style.display = 'none')
});

Watch for added nodes only inside the specified container element that already exists in the document:

setMutationHandler({
    target: document.querySelector('.container-selector'),
    selector: 'p.some-child',
    handler: nodes => nodes.forEach(node => node.style.display = 'none')
});

Advanced example with customized mutation options:

setMutationHandler({
    selector: '.container p.some-child',
    processExisting: false,       // optional
    target: document,             // optional
    childList: true,              // optional
    subtree: true,                // optional
    attributes: false,            // optional
    attributeFilter: [],          // optional
    attributeOldValue: false,     // optional
    characterData: false,         // optional
    characterDataOldValue: false, // optional
    handler: nodes => {
        console.log(nodes);
        return false; // disconnect the observer, this is useful for one-time jobs
    },
});

Make your userscript run at document-start to catch the mutations during page load:

..............
// @run-at        document-start
// @require       https://gf.qytechs.cn/scripts/12228/code/setMutationHandler.js
..............
// ==/UserScript==

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