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A utility function for userscripts that detects and handles AJAXed content.
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.greasyfork.icu/scripts/446257/1059316/waitForKeyElements%20utility%20function.js
// ==UserScript==
// @version 1.0.0
// @name waitForKeyElements utility function
// @description A utility function for userscripts that detects and handles AJAXed content.
// @namespace https://github.com/CoeJoder/waitForKeyElements.js
// @author CoeJoder
// @homepage https://github.com/CoeJoder/waitForKeyElements.js
// @source https://raw.githubusercontent.com/CoeJoder/waitForKeyElements.js/master/waitForKeyElements.js
//
// ==/UserScript==
/**
* A utility function for userscripts that detects and handles AJAXed content.
*
* Usage example:
*
* function callback(domElement) {
* domElement.innerHTML = "This text inserted by waitForKeyElements().";
* }
*
* waitForKeyElements("div.comments", callback);
* // or
* waitForKeyElements(selectorFunction, callback);
*
* @param {(string|function)} selectorOrFunction - The selector string or function.
* @param {function} callback - The callback function; takes a single DOM element as parameter.
* If returns true, element will be processed again on subsequent iterations.
* @param {boolean} [waitOnce=true] - Whether to stop after the first elements are found.
* @param {number} [interval=300] - The time (ms) to wait between iterations.
* @param {number} [maxIntervals=-1] - The max number of intervals to run (negative number for unlimited).
*/
function waitForKeyElements(selectorOrFunction, callback, waitOnce, interval, maxIntervals) {
if (typeof waitOnce === "undefined") {
waitOnce = true;
}
if (typeof interval === "undefined") {
interval = 300;
}
if (typeof maxIntervals === "undefined") {
maxIntervals = -1;
}
var targetNodes = (typeof selectorOrFunction === "function")
? selectorOrFunction()
: document.querySelectorAll(selectorOrFunction);
var targetsFound = targetNodes && targetNodes.length > 0;
if (targetsFound) {
targetNodes.forEach(function(targetNode) {
var attrAlreadyFound = "data-userscript-alreadyFound";
var alreadyFound = targetNode.getAttribute(attrAlreadyFound) || false;
if (!alreadyFound) {
var cancelFound = callback(targetNode);
if (cancelFound) {
targetsFound = false;
}
else {
targetNode.setAttribute(attrAlreadyFound, true);
}
}
});
}
if (maxIntervals !== 0 && !(targetsFound && waitOnce)) {
maxIntervals -= 1;
setTimeout(function() {
waitForKeyElements(selectorOrFunction, callback, waitOnce, interval, maxIntervals);
}, interval);
}
}