Source code
Revision control
Copy as Markdown
Other Tools
export default Controller
/**
* Takes a model and view and acts as the controller between them
*
* @constructor
* @param {object} model The model instance
* @param {object} view The view instance
*/
function Controller(model, view) {
var that = this
that.model = model
that.view = view
that.view.bind('newTodo', function(title) {
that.addItem(title)
})
that.view.bind('itemEdit', function(item) {
that.editItem(item.id)
})
that.view.bind('itemEditDone', function(item) {
that.editItemSave(item.id, item.title)
})
that.view.bind('itemEditCancel', function(item) {
that.editItemCancel(item.id)
})
that.view.bind('itemRemove', function(item) {
that.removeItem(item.id)
})
that.view.bind('itemToggle', function(item) {
that.toggleComplete(item.id, item.completed)
})
that.view.bind('removeCompleted', function() {
that.removeCompletedItems()
})
that.view.bind('toggleAll', function(status) {
that.toggleAll(status.completed)
})
}
/**
* Loads and initialises the view
*
* @param {string} '' | 'active' | 'completed'
*/
Controller.prototype.setView = function(locationHash) {
var route = locationHash.split('/')[1]
var page = route || ''
this._updateFilterState(page)
}
/**
* An event to fire on load. Will get all items and display them in the
* todo-list
*/
Controller.prototype.showAll = function() {
var that = this
that.model.read(function(data) {
that.view.render('showEntries', data)
})
}
/**
* Renders all active tasks
*/
Controller.prototype.showActive = function() {
var that = this
that.model.read({completed: false}, function(data) {
that.view.render('showEntries', data)
})
}
/**
* Renders all completed tasks
*/
Controller.prototype.showCompleted = function() {
var that = this
that.model.read({completed: true}, function(data) {
that.view.render('showEntries', data)
})
}
/**
* An event to fire whenever you want to add an item. Simply pass in the event
* object and it'll handle the DOM insertion and saving of the new item.
*/
Controller.prototype.addItem = function(title) {
var that = this
if (title.trim() === '') {
return
}
that.model.create(title, function() {
that.view.render('clearNewTodo')
that._filter(true)
})
}
/*
* Triggers the item editing mode.
*/
Controller.prototype.editItem = function(id) {
var that = this
that.model.read(id, function(data) {
that.view.render('editItem', {id, title: data[0].title})
})
}
/*
* Finishes the item editing mode successfully.
*/
Controller.prototype.editItemSave = function(id, title) {
var that = this
if (title.trim()) {
that.model.update(id, {title}, function() {
that.view.render('editItemDone', {id, title})
})
} else {
that.removeItem(id)
}
}
/*
* Cancels the item editing mode.
*/
Controller.prototype.editItemCancel = function(id) {
var that = this
that.model.read(id, function(data) {
that.view.render('editItemDone', {id, title: data[0].title})
})
}
/**
* By giving it an ID it'll find the DOM element matching that ID,
* remove it from the DOM and also remove it from storage.
*
* @param {number} id The ID of the item to remove from the DOM and
* storage
*/
Controller.prototype.removeItem = function(id) {
var that = this
that.model.remove(id, function() {
that.view.render('removeItem', id)
})
that._filter()
}
/**
* Will remove all completed items from the DOM and storage.
*/
Controller.prototype.removeCompletedItems = function() {
var that = this
that.model.read({completed: true}, function(data) {
data.forEach(function(item) {
that.removeItem(item.id)
})
})
that._filter()
}
/**
* Give it an ID of a model and a checkbox and it will update the item
* in storage based on the checkbox's state.
*
* @param {number} id The ID of the element to complete or uncomplete
* @param {object} checkbox The checkbox to check the state of complete
* or not
* @param {boolean|undefined} silent Prevent re-filtering the todo items
*/
Controller.prototype.toggleComplete = function(id, completed, silent) {
var that = this
that.model.update(id, {completed}, function() {
that.view.render('elementComplete', {
id,
completed,
})
})
if (!silent) {
that._filter()
}
}
/**
* Will toggle ALL checkboxes' on/off state and completeness of models.
* Just pass in the event object.
*/
Controller.prototype.toggleAll = function(completed) {
var that = this
that.model.read({completed: !completed}, function(data) {
data.forEach(function(item) {
that.toggleComplete(item.id, completed, true)
})
})
that._filter()
}
/**
* Updates the pieces of the page which change depending on the remaining
* number of todos.
*/
Controller.prototype._updateCount = function() {
var that = this
that.model.getCount(function(todos) {
that.view.render('updateElementCount', todos.active)
that.view.render('clearCompletedButton', {
completed: todos.completed,
visible: todos.completed > 0
})
that.view.render('toggleAll', {checked: todos.completed === todos.total})
that.view.render('contentBlockVisibility', {visible: todos.total > 0})
})
}
/**
* Re-filters the todo items, based on the active route.
* @param {boolean|undefined} force forces a re-painting of todo items.
*/
Controller.prototype._filter = function(force) {
var activeRoute = this._activeRoute.charAt(0).toUpperCase() + this._activeRoute.substr(1)
// Update the elements on the page, which change with each completed todo
this._updateCount()
// If the last active route isn't "All", or we're switching routes, we
// re-create the todo item elements, calling:
// this.show[All|Active|Completed]();
if (force || this._lastActiveRoute !== 'All' || this._lastActiveRoute !== activeRoute) {
this['show' + activeRoute]()
}
this._lastActiveRoute = activeRoute
}
/**
* Simply updates the filter nav's selected states
*/
Controller.prototype._updateFilterState = function(currentPage) {
// Store a reference to the active route, allowing us to re-filter todo
// items as they are marked complete or incomplete.
currentPage = currentPage.split('?')[0]
this._activeRoute = currentPage
if (currentPage === '') {
this._activeRoute = 'All'
}
this._filter()
this.view.render('setFilter', currentPage)
}