57 lines
No EOL
1.7 KiB
JavaScript
57 lines
No EOL
1.7 KiB
JavaScript
define(["dom2"], function() {
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/*
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A module for translating UI interactions into events for the rest of the application. Basically it's a pubsub with a dom layer. Listens for menu events, as well as offering an API for firing and subscribing to arbitrary events.
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*/
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var commands = {};
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//commands can pass a callback, although most don't respond that way
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var fire = function(command, argument, callback) {
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if (!commands[command]) return;
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var registry = commands[command].slice();
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registry.forEach(function(entry) {
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var result = entry.callback.apply(entry.scope || null, argument instanceof Array ? argument : [argument], callback);
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});
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}
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var register = function(command, listener, scope) {
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if (!commands[command]) {
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commands[command] = [];
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}
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commands[command].push({
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callback: listener,
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scope: scope
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});
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}
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//delegate for all elements that have a command attribute
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//may want to add more listeners for other UI elements (select)
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document.body.on("click", function(e) {
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//cancel on inputs, selectboxes
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if (["input", "select"].indexOf(e.target.tagName.toLowerCase()) >= 0) return;
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//delegate all items with a command attribute
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if (e.target.hasAttribute("command")) {
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var command = e.target.getAttribute("command");
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var arg = e.target.getAttribute("argument");
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fire(command, arg);
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e.preventDefault();
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}
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});
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document.body.on("change", function(e) {
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if (e.target.hasAttribute("command")) {
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var command = e.target.getAttribute("command");
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var arg = e.target.value;
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fire(command, arg);
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}
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});
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return {
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fire: fire,
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on: register
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};
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}); |