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setMutationHandler

MutationObserver wrapper to wait for the specified CSS selector

Verzia zo dňa 22.07.2016. Pozri najnovšiu verziu.

Tento skript by nemal byť nainštalovaný priamo. Je to knižnica pre ďalšie skripty, ktorú by mali používať cez meta príkaz // @require https://update.greatest.deepsurf.us/scripts/12228/137548/setMutationHandler.js

Autor
woxxom
Verzia
2.0.7
Vytvorené
05.09.2015
Aktualizované
22.07.2016
Veľkosť
2,2 KB
Licencia
neuvedené

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://greatest.deepsurf.us/scripts/12228/code/setMutationHandler.js
..............
// ==/UserScript==

  • Watch for added nodes:

    setMutationHandler(document, '.container p.some-selector', function(nodes) {
    nodes.forEach(function(node) {
        node.style.display = 'none';
    });
    //this.disconnect(); // stop observing 
    return true; // continue enumerating current batch of mutations
});

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

    setMutationHandler(document.querySelector('.container-selector'), '.some-selector', function(nodes) {
    nodes.forEach(function(node) {
        node.style.display = 'none';
    });
    //this.disconnect(); // stop observing 
    return true; // continue enumerating current batch of mutations
});

  • Advanced example with customized options to watch for changes in the title attribute:

    setMutationHandler(document, '.some-selector', processNodes, {
    attributes: true, attributeFilter: ['title'],
    subtree: true
});
function processNodes(nodes, mutation) {
    console.log('Node %O changed title from "%s" to "%s"',
        nodes[0], mutation.oldValue, nodes[0].title);
    });
    //this.disconnect(); // stop observing 
    return true; // continue enumerating current batch of mutations
});

  • You may want to make your userscript run at document-start to catch the mutations during page load:

    ..............
// @run-at        document-start
// @require       https://greatest.deepsurf.us/scripts/12228/code/setMutationHandler.js
..............
// ==/UserScript==