131 lines
3.8 KiB
JavaScript
131 lines
3.8 KiB
JavaScript
(function () {
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// Note: this is all the code required to customize Backbone's trigger() method to make
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// it resilient to exceptions thrown by event handlers. Indentation and code styles
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// were kept inline with the Backbone implementation for easier diffs.
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// The changes are:
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// 1. added 'name' parameter to triggerEvents to give it access to the current event name
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// 2. added try/catch handlers to triggerEvents with error logging inside every while loop
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// And of course, we update the protoypes of Backbone.Model/Backbone.View as well as
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// Backbone.Events itself
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// jscs:disable
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var arr = [];
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var slice = arr.slice;
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// Regular expression used to split event strings.
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var eventSplitter = /\s+/;
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// Implement fancy features of the Events API such as multiple event
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// names `"change blur"` and jQuery-style event maps `{change: action}`
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// in terms of the existing API.
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var eventsApi = function(obj, action, name, rest) {
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if (!name) return true;
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// Handle event maps.
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if (typeof name === 'object') {
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for (var key in name) {
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obj[action].apply(obj, [key, name[key]].concat(rest));
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}
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return false;
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}
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// Handle space separated event names.
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if (eventSplitter.test(name)) {
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var names = name.split(eventSplitter);
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for (var i = 0, l = names.length; i < l; i++) {
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obj[action].apply(obj, [names[i]].concat(rest));
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}
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return false;
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}
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return true;
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};
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// A difficult-to-believe, but optimized internal dispatch function for
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// triggering events. Tries to keep the usual cases speedy (most internal
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// Backbone events have 3 arguments).
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var triggerEvents = function(events, name, args) {
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var ev, i = -1, l = events.length, a1 = args[0], a2 = args[1], a3 = args[2];
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var logError = function(error) {
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console.log('Model caught error triggering', name, 'event:', error && error.stack ? error.stack : error);
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};
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switch (args.length) {
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case 0:
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while (++i < l) {
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try {
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(ev = events[i]).callback.call(ev.ctx);
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}
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catch (error) {
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logError(error);
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}
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}
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return;
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case 1:
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while (++i < l) {
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try {
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(ev = events[i]).callback.call(ev.ctx, a1);
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}
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catch (error) {
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logError(error);
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}
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}
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return;
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case 2:
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while (++i < l) {
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try {
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(ev = events[i]).callback.call(ev.ctx, a1, a2);
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}
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catch (error) {
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logError(error);
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}
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}
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return;
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case 3:
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while (++i < l) {
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try {
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(ev = events[i]).callback.call(ev.ctx, a1, a2, a3);
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}
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catch (error) {
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logError(error);
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}
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}
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return;
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default:
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while (++i < l) {
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try {
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(ev = events[i]).callback.apply(ev.ctx, args);
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}
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catch (error) {
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logError(error);
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}
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}
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return;
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}
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};
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// Trigger one or many events, firing all bound callbacks. Callbacks are
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// passed the same arguments as `trigger` is, apart from the event name
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// (unless you're listening on `"all"`, which will cause your callback to
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// receive the true name of the event as the first argument).
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function trigger(name) {
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if (!this._events) return this;
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var args = slice.call(arguments, 1);
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if (!eventsApi(this, 'trigger', name, args)) return this;
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var events = this._events[name];
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var allEvents = this._events.all;
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if (events) triggerEvents(events, name, args);
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if (allEvents) triggerEvents(allEvents, name, arguments);
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return this;
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}
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Backbone.Model.prototype.trigger
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= Backbone.View.prototype.trigger
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= Backbone.Collection.prototype.trigger
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= Backbone.Events.trigger
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= trigger;
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})();
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