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|
/*jshint browser:true, node:true*/
'use strict';
/**
* 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);
this._unmount();
}
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) {
Iif (!child.model) {
var err = new Error("Child without a model");
err.context = child;
throw err;
}
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();
this._unmountChildren();
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.mount(util.byId(child._fmid, root));
child._fetchEls(child.el || root);
});
};
/**
* Associate the view with an element.
* Provide events and lifecycle methods
* to fire when the element is newly
* associated.
*
* @param {Element} el
* @return {Element}
*/
proto.mount = function(el) {
if(this.el !== el) {
this.fireStatic('before mount');
this.el = el;
if(this._mount) this._mount();
this.fireStatic('mount');
}
return this.el;
};
/**
* Recursively fire unmount events on
* children. To be called when a view's
* children are implicitly removed from
* the DOM (e.g. setting innerHTML)
*
* @api private
*/
proto._unmountChildren = function() {
this.each(function(child) {
child._unmount();
});
};
/*_setEl * Recursively fire unmount events on
* a view and its children. To be
* called when a view'is implicitly
* removed from the DOM (e.g. _setEl)
*
* @api private
*/
proto._unmount = function() {
this._unmountChildren();
this.fireStatic('unmount');
}
/**
* 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.mount(this.el || document.getElementById(this._fmid) || undefined);
};
/**
* 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);
this._unmount();
}
// Update cache
this.mount(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;
};
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