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arrive.js provides events to watch for DOM elements creation and removal. It makes use of Mutation Observers internally.
此脚本不应直接安装，它是一个供其他脚本使用的外部库。如果您需要使用该库，请在脚本元属性加入：// @require https://update.greasyfork.org/scripts/21927/198809/arrivejs.js
/*globals jQuery,Window,HTMLElement,HTMLDocument,HTMLCollection,NodeList,MutationObserver */
/*exported Arrive*/
/*jshint latedef:false */
/*
* arrive.js
* v2.4.1
* https://github.com/uzairfarooq/arrive
* MIT licensed
*
* Copyright (c) 2014-2017 Uzair Farooq
*/
var Arrive = (function(window, $, undefined) {
"use strict";
if(!window.MutationObserver || typeof HTMLElement === 'undefined'){
return; //for unsupported browsers
}
var arriveUniqueId = 0;
var utils = (function() {
var matches = HTMLElement.prototype.matches || HTMLElement.prototype.webkitMatchesSelector || HTMLElement.prototype.mozMatchesSelector
|| HTMLElement.prototype.msMatchesSelector;
return {
matchesSelector: function(elem, selector) {
return elem instanceof HTMLElement && matches.call(elem, selector);
},
// to enable function overloading - By John Resig (MIT Licensed)
addMethod: function (object, name, fn) {
var old = object[ name ];
object[ name ] = function(){
if ( fn.length == arguments.length ) {
return fn.apply( this, arguments );
}
else if ( typeof old == 'function' ) {
return old.apply( this, arguments );
}
};
},
callCallbacks: function(callbacksToBeCalled, registrationData) {
if (registrationData && registrationData.options.onceOnly && registrationData.firedElems.length == 1) {
// as onlyOnce param is true, make sure we fire the event for only one item
callbacksToBeCalled = [callbacksToBeCalled[0]];
}
for (var i = 0, cb; (cb = callbacksToBeCalled[i]); i++) {
if (cb && cb.callback) {
cb.callback.call(cb.elem, cb.elem);
}
}
if (registrationData && registrationData.options.onceOnly && registrationData.firedElems.length == 1) {
// unbind event after first callback as onceOnly is true.
registrationData.me.unbindEventWithSelectorAndCallback.call(
registrationData.target, registrationData.selector, registrationData.callback);
}
},
// traverse through all descendants of a node to check if event should be fired for any descendant
checkChildNodesRecursively: function(nodes, registrationData, matchFunc, callbacksToBeCalled) {
// check each new node if it matches the selector
for (var i=0, node; (node = nodes[i]); i++) {
if (matchFunc(node, registrationData, callbacksToBeCalled)) {
callbacksToBeCalled.push({ callback: registrationData.callback, elem: node });
}
if (node.childNodes.length > 0) {
utils.checkChildNodesRecursively(node.childNodes, registrationData, matchFunc, callbacksToBeCalled);
}
}
},
mergeArrays: function(firstArr, secondArr){
// Overwrites default options with user-defined options.
var options = {},
attrName;
for (attrName in firstArr) {
if (firstArr.hasOwnProperty(attrName)) {
options[attrName] = firstArr[attrName];
}
}
for (attrName in secondArr) {
if (secondArr.hasOwnProperty(attrName)) {
options[attrName] = secondArr[attrName];
}
}
return options;
},
toElementsArray: function (elements) {
// check if object is an array (or array like object)
// Note: window object has .length property but it's not array of elements so don't consider it an array
if (typeof elements !== "undefined" && (typeof elements.length !== "number" || elements === window)) {
elements = [elements];
}
return elements;
}
};
})();
// Class to maintain state of all registered events of a single type
var EventsBucket = (function() {
var EventsBucket = function() {
// holds all the events
this._eventsBucket = [];
// function to be called while adding an event, the function should do the event initialization/registration
this._beforeAdding = null;
// function to be called while removing an event, the function should do the event destruction
this._beforeRemoving = null;
};
EventsBucket.prototype.addEvent = function(target, selector, options, callback) {
var newEvent = {
target: target,
selector: selector,
options: options,
callback: callback,
firedElems: []
};
if (this._beforeAdding) {
this._beforeAdding(newEvent);
}
this._eventsBucket.push(newEvent);
return newEvent;
};
EventsBucket.prototype.removeEvent = function(compareFunction) {
for (var i=this._eventsBucket.length - 1, registeredEvent; (registeredEvent = this._eventsBucket[i]); i--) {
if (compareFunction(registeredEvent)) {
if (this._beforeRemoving) {
this._beforeRemoving(registeredEvent);
}
// mark callback as null so that even if an event mutation was already triggered it does not call callback
var removedEvents = this._eventsBucket.splice(i, 1);
if (removedEvents && removedEvents.length) {
removedEvents[0].callback = null;
}
}
}
};
EventsBucket.prototype.beforeAdding = function(beforeAdding) {
this._beforeAdding = beforeAdding;
};
EventsBucket.prototype.beforeRemoving = function(beforeRemoving) {
this._beforeRemoving = beforeRemoving;
};
return EventsBucket;
})();
/**
* @constructor
* General class for binding/unbinding arrive and leave events
*/
var MutationEvents = function(getObserverConfig, onMutation) {
var eventsBucket = new EventsBucket(),
me = this;
var defaultOptions = {
fireOnAttributesModification: false
};
// actual event registration before adding it to bucket
eventsBucket.beforeAdding(function(registrationData) {
var
target = registrationData.target,
observer;
// mutation observer does not work on window or document
if (target === window.document || target === window) {
target = document.getElementsByTagName("html")[0];
}
// Create an observer instance
observer = new MutationObserver(function(e) {
onMutation.call(this, e, registrationData);
});
var config = getObserverConfig(registrationData.options);
observer.observe(target, config);
registrationData.observer = observer;
registrationData.me = me;
});
// cleanup/unregister before removing an event
eventsBucket.beforeRemoving(function (eventData) {
eventData.observer.disconnect();
});
this.bindEvent = function(selector, options, callback) {
options = utils.mergeArrays(defaultOptions, options);
var elements = utils.toElementsArray(this);
for (var i = 0; i < elements.length; i++) {
eventsBucket.addEvent(elements[i], selector, options, callback);
}
};
this.unbindEvent = function() {
var elements = utils.toElementsArray(this);
eventsBucket.removeEvent(function(eventObj) {
for (var i = 0; i < elements.length; i++) {
if (this === undefined || eventObj.target === elements[i]) {
return true;
}
}
return false;
});
};
this.unbindEventWithSelectorOrCallback = function(selector) {
var elements = utils.toElementsArray(this),
callback = selector,
compareFunction;
if (typeof selector === "function") {
compareFunction = function(eventObj) {
for (var i = 0; i < elements.length; i++) {
if ((this === undefined || eventObj.target === elements[i]) && eventObj.callback === callback) {
return true;
}
}
return false;
};
}
else {
compareFunction = function(eventObj) {
for (var i = 0; i < elements.length; i++) {
if ((this === undefined || eventObj.target === elements[i]) && eventObj.selector === selector) {
return true;
}
}
return false;
};
}
eventsBucket.removeEvent(compareFunction);
};
this.unbindEventWithSelectorAndCallback = function(selector, callback) {
var elements = utils.toElementsArray(this);
eventsBucket.removeEvent(function(eventObj) {
for (var i = 0; i < elements.length; i++) {
if ((this === undefined || eventObj.target === elements[i]) && eventObj.selector === selector && eventObj.callback === callback) {
return true;
}
}
return false;
});
};
return this;
};
/**
* @constructor
* Processes 'arrive' events
*/
var ArriveEvents = function() {
// Default options for 'arrive' event
var arriveDefaultOptions = {
fireOnAttributesModification: false,
onceOnly: false,
existing: false
};
function getArriveObserverConfig(options) {
var config = {
attributes: false,
childList: true,
subtree: true
};
if (options.fireOnAttributesModification) {
config.attributes = true;
}
return config;
}
function onArriveMutation(mutations, registrationData) {
mutations.forEach(function( mutation ) {
var newNodes = mutation.addedNodes,
targetNode = mutation.target,
callbacksToBeCalled = [],
node;
// If new nodes are added
if( newNodes !== null && newNodes.length > 0 ) {
utils.checkChildNodesRecursively(newNodes, registrationData, nodeMatchFunc, callbacksToBeCalled);
}
else if (mutation.type === "attributes") {
if (nodeMatchFunc(targetNode, registrationData, callbacksToBeCalled)) {
callbacksToBeCalled.push({ callback: registrationData.callback, elem: targetNode });
}
}
utils.callCallbacks(callbacksToBeCalled, registrationData);
});
}
function nodeMatchFunc(node, registrationData, callbacksToBeCalled) {
// check a single node to see if it matches the selector
if (utils.matchesSelector(node, registrationData.selector)) {
if(node._id === undefined) {
node._id = arriveUniqueId++;
}
// make sure the arrive event is not already fired for the element
if (registrationData.firedElems.indexOf(node._id) == -1) {
registrationData.firedElems.push(node._id);
return true;
}
}
return false;
}
arriveEvents = new MutationEvents(getArriveObserverConfig, onArriveMutation);
var mutationBindEvent = arriveEvents.bindEvent;
// override bindEvent function
arriveEvents.bindEvent = function(selector, options, callback) {
if (typeof callback === "undefined") {
callback = options;
options = arriveDefaultOptions;
} else {
options = utils.mergeArrays(arriveDefaultOptions, options);
}
var elements = utils.toElementsArray(this);
if (options.existing) {
var existing = [];
for (var i = 0; i < elements.length; i++) {
var nodes = elements[i].querySelectorAll(selector);
for (var j = 0; j < nodes.length; j++) {
existing.push({ callback: callback, elem: nodes[j] });
}
}
// no need to bind event if the callback has to be fired only once and we have already found the element
if (options.onceOnly && existing.length) {
return callback.call(existing[0].elem, existing[0].elem);
}
setTimeout(utils.callCallbacks, 1, existing);
}
mutationBindEvent.call(this, selector, options, callback);
};
return arriveEvents;
};
/**
* @constructor
* Processes 'leave' events
*/
var LeaveEvents = function() {
// Default options for 'leave' event
var leaveDefaultOptions = {};
function getLeaveObserverConfig() {
var config = {
childList: true,
subtree: true
};
return config;
}
function onLeaveMutation(mutations, registrationData) {
mutations.forEach(function( mutation ) {
var removedNodes = mutation.removedNodes,
callbacksToBeCalled = [];
if( removedNodes !== null && removedNodes.length > 0 ) {
utils.checkChildNodesRecursively(removedNodes, registrationData, nodeMatchFunc, callbacksToBeCalled);
}
utils.callCallbacks(callbacksToBeCalled, registrationData);
});
}
function nodeMatchFunc(node, registrationData) {
return utils.matchesSelector(node, registrationData.selector);
}
leaveEvents = new MutationEvents(getLeaveObserverConfig, onLeaveMutation);
var mutationBindEvent = leaveEvents.bindEvent;
// override bindEvent function
leaveEvents.bindEvent = function(selector, options, callback) {
if (typeof callback === "undefined") {
callback = options;
options = leaveDefaultOptions;
} else {
options = utils.mergeArrays(leaveDefaultOptions, options);
}
mutationBindEvent.call(this, selector, options, callback);
};
return leaveEvents;
};
var arriveEvents = new ArriveEvents(),
leaveEvents = new LeaveEvents();
function exposeUnbindApi(eventObj, exposeTo, funcName) {
// expose unbind function with function overriding
utils.addMethod(exposeTo, funcName, eventObj.unbindEvent);
utils.addMethod(exposeTo, funcName, eventObj.unbindEventWithSelectorOrCallback);
utils.addMethod(exposeTo, funcName, eventObj.unbindEventWithSelectorAndCallback);
}
/*** expose APIs ***/
function exposeApi(exposeTo) {
exposeTo.arrive = arriveEvents.bindEvent;
exposeUnbindApi(arriveEvents, exposeTo, "unbindArrive");
exposeTo.leave = leaveEvents.bindEvent;
exposeUnbindApi(leaveEvents, exposeTo, "unbindLeave");
}
if ($) {
exposeApi($.fn);
}
exposeApi(HTMLElement.prototype);
exposeApi(NodeList.prototype);
exposeApi(HTMLCollection.prototype);
exposeApi(HTMLDocument.prototype);
exposeApi(Window.prototype);
var Arrive = {};
// expose functions to unbind all arrive/leave events
exposeUnbindApi(arriveEvents, Arrive, "unbindAllArrive");
exposeUnbindApi(leaveEvents, Arrive, "unbindAllLeave");
return Arrive;
})(window, typeof jQuery === 'undefined' ? null : jQuery, undefined);