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/** * Module Dependencies */ var util = require('utils'); var events = require('./events'); var extend = require('extend'); var mixin = util.mixin; /** * Exports */ module.exports = function(fm) { // Alias prototype for optimum // compression via uglifyjs var proto = Module.prototype; /** * Module constructor * * Options: * * - `id {String}` a unique id to query by * - `model {Object|Model}` the data with which to associate this module * - `tag {String}` tagName to use for the root element * - `classes {Array}` list of classes to add to the root element * - `template {Function}` a template to use for rendering * - `helpers {Array}`a list of helper function to use on this module * - `children {Object|Array}` list of child modules * * @constructor * @param {Object} options * @api public */ function Module(options) { // Shallow clone the options options = mixin({}, options); // Various config steps this._configure(options); this._add(options.children); // Fire before initialize event hook this.fireStatic('before initialize', options); // Run initialize hooks if (this.initialize) this.initialize(options); // Fire initialize event hook this.fireStatic('initialize', options); } /** * Configures the new Module * with the options passed * to the constructor. * * @param {Object} options * @api private */ proto._configure = function(options) { // Setup static properties this._id = options.id || util.uniqueId(); this._fmid = options.fmid || util.uniqueId('fmid'); this.tag = options.tag || this.tag || 'div'; this.classes = options.classes || this.classes || []; this.helpers = options.helpers || this.helpers || []; this.template = this._setTemplate(options.template || this.template); this.slot = options.slot; // Create id and module // lookup objects this.children = []; this._ids = {}; this._modules = {}; this.slots = {}; // Use the model passed in, // or create a model from // the data passed in. var model = options.model || options.data || {}; this.model = util.isPlainObject(model) ? new this.Model(model) : model; // Attach helpers // TODO: Fix this for non-ES5 environments this.helpers.forEach(this.attachHelper, this); // We fire and 'inflation' event here // so that helpers can make some changes // to the view before instantiation. if (options.fmid) { fm.fire('inflation', this, options); this.fireStatic('inflation', options); } }; /** * A private add method * that accepts a list of * children. * * @param {Object|Array} children * @api private */ proto._add = function(children) { if (!children) return; var isArray = util.isArray(children); var child; for (var key in children) { child = children[key]; if (!isArray) child.slot = key; this.add(child); } }, /** * Instantiates the given * helper on the Module. * * @param {Function} helper * @return {Module} * @api private */ proto.attachHelper = function(helper) { Eif (helper) helper(this); }, /** * Returns the template function * for the view. * * For template object like Hogan * templates with a `render` method * we need to bind the context * so they can be called without * a reciever. * * @return {Function} * @api private */ proto._setTemplate = function(fn) { return fn && fn.render ? util.bind(fn.render, fn) : fn; }; /** * Adds a child view(s) to another Module. * * Options: * * - `at` The child index at which to insert * - `inject` Injects the child's view element into the parent's * - `slot` The slot at which to insert the child * * @param {Module|Object} children * @param {Object|String|Number} options|slot */ proto.add = function(child, options) { Iif (!child) return this; // Options var at = options && options.at; var inject = options && options.inject; var slot = ('object' === typeof options) ? options.slot : options; // Remove this view first if it already has a parent if (child.parent) child.remove({ fromDOM: false }); // Assign a slot (prefering defined option) slot = child.slot = slot || child.slot; // Remove any module that already occupies this slot var resident = this.slots[slot]; if (resident) resident.remove({ fromDOM: false }); // If it's not a Module, make it one. if (!(child instanceof Module)) child = fm(child); util.insert(child, this.children, at); this._addLookup(child); // We append the child to the parent view if there is a view // element and the users hasn't flagged `append` false. Iif (inject) this._injectEl(child.el, options); // Allow chaining return this; }; /** * Removes a child view from * its current Module contexts * and also from the DOM unless * otherwise stated. * * Options: * * - `fromDOM` Whether the element should be removed from the DOM (default `true`) * * Example: * * // The following are equal * // apple is removed from the * // the view structure and DOM * layout.remove(apple); * apple.remove(); * * // Apple is removed from the * // view structure, but not the DOM * layout.remove(apple, { el: false }); * apple.remove({ el: false }); * * @return {FruitMachine} * @api public */ proto.remove = function(param1, param2) { // Don't do anything if the first arg is undefined if (arguments.length === 1 && !param1) return this; // Allow view.remove(child[, options]) // and view.remove([options]); if (param1 instanceof Module) { param1.remove(param2 || {}); return this; } // Options and aliases var options = param1 || {}; var fromDOM = options.fromDOM !== false; var parent = this.parent; var el = this.el; var parentNode = el && el.parentNode; var index; // Unless stated otherwise, // remove the view element // from its parent node. if (fromDOM && parentNode) { parentNode.removeChild(el); } if (parent) { // Remove reference from views array index = parent.children.indexOf(this); parent.children.splice(index, 1); // Remove references from the lookup parent._removeLookup(this); } return this; }; /** * Creates a lookup reference for * the child view passed. * * @param {Module} child * @api private */ proto._addLookup = function(child) { var module = child.module(); // Add a lookup for module (this._modules[module] = this._modules[module] || []).push(child); // Add a lookup for id this._ids[child.id()] = child; // Store a reference by slot if (child.slot) this.slots[child.slot] = child; child.parent = this; }; /** * Removes the lookup for the * the child view passed. * * @param {Module} child * @api private */ proto._removeLookup = function(child) { var module = child.module(); // Remove the module lookup var index = this._modules[module].indexOf(child); this._modules[module].splice(index, 1); // Remove the id and slot lookup delete this._ids[child._id]; delete this.slots[child.slot]; delete child.parent; }; /** * Injects an element into the * Module's root element. * * By default the element is appended. * * Options: * * - `at` The index at which to insert. * * @param {Element} el * @param {Object} options * @api private */ proto._injectEl = function(el, options) { var at = options && options.at; var parent = this.el; if (!el || !parent) return; if (typeof at !== 'undefined') { parent.insertBefore(el, parent.children[at]); } else { parent.appendChild(el); } }; /** * Returns a decendent module * by id, or if called with no * arguments, returns this view's id. * * Example: * * myModule.id(); * //=> 'my_view_id' * * myModule.id('my_other_views_id'); * //=> Module * * @param {String|undefined} id * @return {Module|String} * @api public */ proto.id = function(id) { if (!arguments.length) return this._id; var child = this._ids[id]; if (child) return child; return this.each(function(view) { return view.id(id); }); }; /** * Returns the first descendent * Module with the passed module type. * If called with no arguments the * Module's own module type is returned. * * Example: * * // Assuming 'myModule' has 3 descendent * // views with the module type 'apple' * * myModule.modules('apple'); * //=> Module * * @param {String} key * @return {Module} */ proto.module = function(key) { if (!arguments.length) return this._module || this.name; var view = this._modules[key]; if (view && view.length) return view[0]; return this.each(function(view) { return view.module(key); }); }; /** * Returns a list of descendent * Modules that match the module * type given (Similar to * Element.querySelectorAll();). * * Example: * * // Assuming 'myModule' has 3 descendent * // views with the module type 'apple' * * myModule.modules('apple'); * //=> [ Module, Module, Module ] * * @param {String} key * @return {Array} * @api public */ proto.modules = function(key) { var list = this._modules[key] || []; // Then loop each child and run the // same opperation, appending the result // onto the list. this.each(function(view) { list = list.concat(view.modules(key)); }); return list; }; /** * Calls the passed function * for each of the view's * children. * * Example: * * myModule.each(function(child) { * // Do stuff with each child view... * }); * * @param {Function} fn * @return {[type]} */ proto.each = function(fn) { var l = this.children.length; var result; for (var i = 0; i < l; i++) { result = fn(this.children[i]); if (result) return result; } }; /** * Templates the view, including * any descendent views returning * an html string. All data in the * views model is made accessible * to the template. * * Child views are printed into the * parent template by `id`. Alternatively * children can be iterated over a a list * and printed with `{{{child}}}}`. * * Example: * * <div class="slot-1">{{{<slot>}}}</div> * <div class="slot-2">{{{<slot>}}}</div> * * // or * * {{#children}} * {{{child}}} * {{/children}} * * @return {String} * @api public */ proto.toHTML = function() { var html = this._innerHTML(); // Wrap the html in a FruitMachine // generated root element and return. return this._wrapHTML(html); }; /** * Get the view's innerHTML * * @return {String} */ proto._innerHTML = function() { this.fireStatic('before tohtml'); var data = {}; var html; var tmp; // Create an array for view // children data needed in template. data[fm.config.templateIterator] = []; // Loop each child this.each(function(child) { tmp = {}; html = child.toHTML(); data[child.slot || child.id()] = html; tmp[fm.config.templateInstance] = html; data.children.push(mixin(tmp, child.model.toJSON())); }); // Run the template render method // passing children data (for looping // or child views) mixed with the // view's model data. return this.template ? this.template(mixin(data, this.model.toJSON())) : ''; }; /** * Wraps the module html in * a root element. * * @param {String} html * @return {String} * @api private */ proto._wrapHTML = function(html) { return '<' + this.tag + ' class="' + this._classes().join(' ') + '" id="' + this._fmid + '">' + html + '</' + this.tag + '>'; }; /** * Gets a space separated list * of all a view's classes * * @return {String} * @api private */ proto._classes = function() { return [this.module()].concat(this.classes); }; /** * Renders the view and replaces * the `view.el` with a freshly * rendered node. * * Fires a `render` event on the view. * * @return {Module} */ proto.render = function() { this.fireStatic('before render'); // If possible recycle outer element but // build from scratch if there is no // existing element or if tag changed var el = this.el; var classes; if (el && el.tagName === this.tag.toUpperCase()) { el.innerHTML = this._innerHTML(); classes = el.className.split(/\s+/); this._classes().forEach(function(add) { if (!~classes.indexOf(add)) el.className = el.className + ' ' + add; }); // Sets a new element as a view's // root element (purging descendent // element caches). } else { this._setEl(util.toNode(this.toHTML())); } // Fetch all child module elements this._fetchEls(this.el); // Handy hook this.fireStatic('render'); return this; }; /** * Sets up a view and all descendent * views. * * Setup will be aborted if no `view.el` * is found. If a view is already setup, * teardown is run first to prevent a * view being setup twice. * * Your custom `setup()` method is called * * Options: * * - `shallow` Does not recurse when `true` (default `false`) * * @param {Object} options * @return {Module} */ proto.setup = function(options) { var shallow = options && options.shallow; // Attempt to fetch the view's // root element. Don't continue // if no route element is found. if (!this._getEl()) return this; // If this is already setup, call // `teardown` first so that we don't // duplicate event bindings and shizzle. if (this.isSetup) this.teardown({ shallow: true }); // Fire the `setup` event hook this.fireStatic('before setup'); Eif (this._setup) this._setup(); this.fireStatic('setup'); // Flag view as 'setup' this.isSetup = true; // Call 'setup' on all subviews // first (top down recursion) if (!shallow) { this.each(function(child) { child.setup(); }); } // For chaining return this; }; /** * Tearsdown a view and all descendent * views that have been setup. * * Your custom `teardown` method is * called and a `teardown` event is fired. * * Options: * * - `shallow` Does not recurse when `true` (default `false`) * * @param {Object} options * @return {Module} */ proto.teardown = function(options) { var shallow = options && options.shallow; // Call 'setup' on all subviews // first (bottom up recursion). if (!shallow) { this.each(function(child) { child.teardown(); }); } // Only teardown if this view // has been setup. Teardown // is supposed to undo all the // work setup does, and therefore // will likely run into undefined // variables if setup hasn't run. if (this.isSetup) { this.fireStatic('before teardown'); Eif (this._teardown) this._teardown(); this.fireStatic('teardown'); this.isSetup = false; } // For chaining return this; }; /** * Completely destroys a view. This means * a view is torn down, removed from it's * current layout context and removed * from the DOM. * * Your custom `destroy` method is * called and a `destroy` event is fired. * * NOTE: `.remove()` is only run on the view * that `.destroy()` is directly called on. * * Options: * * - `fromDOM` Whether the view should be removed from DOM (default `true`) * * @api public */ proto.destroy = function(options) { options = options || {}; var remove = options.remove !== false; var l = this.children.length; // Destroy each child view. // We don't waste time removing // the child elements as they will // get removed when the parent // element is removed. // // We can't use the standard Module#each() // as the array length gets altered // with each iteration, hense the // reverse while loop. while (l--) { this.children[l].destroy({ remove: false }); } // Don't continue if this view // has already been destroyed. if (this.destroyed) return this; // .remove() is only run on the view that // destroy() was called on. // // It is a waste of time to remove the // descendent views as well, as any // references to them will get wiped // within destroy and they will get // removed from the DOM with the main view. if (remove) this.remove(options); // Run teardown this.teardown({ shallow: true }); // Fire an event hook before the // custom destroy logic is run this.fireStatic('before destroy'); // If custom destroy logic has been // defined on the prototype then run it. Eif (this._destroy) this._destroy(); // Trigger a `destroy` event // for custom Modules to bind to. this.fireStatic('destroy'); // Unbind any old event listeners this.off(); // Set a flag to say this view // has been destroyed. This is // useful to check for after a // slow ajax call that might come // back after a view has been detroyed. this.destroyed = true; // Clear references this.el = this.model = this.parent = this._modules = this._ids = this._id = null; }; /** * Destroys all children. * * Is this needed? * * @return {Module} * @api public */ proto.empty = function() { var l = this.children.length; while (l--) this.children[l].destroy(); return this; }; /** * Fetches all descendant elements * from the given root element. * * @param {Element} root * @return {undefined} * @api private */ proto._fetchEls = function(root) { Iif (!root) return; this.each(function(child) { child.el = util.byId(child._fmid, root); child._fetchEls(child.el || root); }); }; /** * Returns the Module's root element. * * If a cache is present it is used, * else we search the DOM, else we * find the closest element and * perform a querySelector using * the view._fmid. * * @return {Element|undefined} * @api private */ proto._getEl = function() { Iif (!util.hasDom()) return; return this.el = this.el || document.getElementById(this._fmid); }; /** * Sets a root element on a view. * If the view already has a root * element, it is replaced. * * IMPORTANT: All descendent root * element caches are purged so that * the new correct elements are retrieved * next time Module#getElement is called. * * @param {Element} el * @return {Module} * @api private */ proto._setEl = function(el) { var existing = this.el; var parentNode = existing && existing.parentNode; // If the existing element has a context, replace it if (parentNode) parentNode.replaceChild(el, existing); // Update cache this.el = el; return this; }; /** * Empties the destination element * and appends the view into it. * * @param {Element} dest * @return {Module} * @api public */ proto.inject = function(dest) { if (dest) { dest.innerHTML = ''; this.insertBefore(dest, null); this.fireStatic('inject'); } return this; }; /** * Appends the view element into * the destination element. * * @param {Element} dest * @return {Module} * @api public */ proto.appendTo = function(dest) { return this.insertBefore(dest, null); }; /** * Inserts the view element before the * given child of the destination element. * * @param {Element} dest * @param {Element} beforeEl * @return {Module} * @api public */ proto.insertBefore = function(dest, beforeEl) { Eif (this.el && dest && dest.insertBefore) { dest.insertBefore(this.el, beforeEl); // This badly-named event is for legacy reasons; perhaps 'insert' would be better here? this.fireStatic('appendto'); } return this; }; /** * Returns a JSON represention of * a FruitMachine Module. This can * be generated serverside and * passed into new FruitMachine(json) * to inflate serverside rendered * views. * * @return {Object} * @api public */ proto.toJSON = function() { var json = {}; json.children = []; // Recurse this.each(function(child) { json.children.push(child.toJSON()); }); json.id = this.id(); json.fmid = this._fmid; json.module = this.module(); json.model = this.model.toJSON(); json.slot = this.slot; // Fire a hook to allow third // parties to alter the json output this.fireStatic('tojson', json); return json; }; // Events proto.on = events.on; proto.off = events.off; proto.fire = events.fire; proto.fireStatic = events.fireStatic; // Allow Modules to be extended Module.extend = extend(util.keys(proto)); // Adding proto.Model after // Module.extend means this // key can be overwritten. proto.Model = fm.Model; return Module; }; |