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waitUntilExists

waitUntilExists lib

Dieses Skript sollte nicht direkt installiert werden. Es handelt sich hier um eine Bibliothek für andere Skripte, welche über folgenden Befehl in den Metadaten eines Skriptes eingebunden wird // @require https://update.greatest.deepsurf.us/scripts/4742/15821/waitUntilExists.js 

;(function ($, window) {

var intervals = {};
var removeListener = function(selector) {

	if (intervals[selector]) {
		
		window.clearInterval(intervals[selector]);
		intervals[selector] = null;
	}
};
var found = 'waitUntilExists.found';

/**
 * @function
 * @property {object} jQuery plugin which runs handler function once specified
 *           element is inserted into the DOM
 * @param {function|string} handler 
 *            A function to execute at the time when the element is inserted or 
 *            string "remove" to remove the listener from the given selector
 * @param {bool} shouldRunHandlerOnce 
 *            Optional: if true, handler is unbound after its first invocation
 * @example jQuery(selector).waitUntilExists(function);
 */
 
$.fn.waitUntilExists = function(handler, shouldRunHandlerOnce, isChild) {

	var selector = this.selector;
	var $this = $(selector);
	var $elements = $this.not(function() { return $(this).data(found); });
	
	if (handler === 'remove') {
		
		// Hijack and remove interval immediately if the code requests
		removeListener(selector);
	}
	else {

		// Run the handler on all found elements and mark as found
		$elements.each(handler).data(found, true);
		
		if (shouldRunHandlerOnce && $this.length) {
			
			// Element was found, implying the handler already ran for all 
			// matched elements
			removeListener(selector);
		}
		else if (!isChild) {
			
			// If this is a recurring search or if the target has not yet been 
			// found, create an interval to continue searching for the target
			intervals[selector] = window.setInterval(function () {
				
				$this.waitUntilExists(handler, shouldRunHandlerOnce, true);
			}, 500);
		}
	}
	
	return $this;
};
 
}(jQuery, window));