How to get the cell view on backbone event click? - javascript

When i trigger a click on a cell with backbone event im not getting the cell view, im getting the view of the row.
I'm sending the models and the week atributes to my UserView.
So what i want is that every cell is a unique backbone view. Can anyone help me?
Backbone view
app.types.UserView = Backbone.View.extend({
tagName: 'tr',
$sidebar: $('#userView'),
template: _.template($('#user-template').html()),
events:
{
//"click .test": "open",
"click td.test": "useri",
},
initialize: function(options)
{
this.options = options;
console.log("this.options", this.options.object.tjedan);
console.log("this.model: ", this.model);
this.$sidebar.append(this.render());
this.tableClick();
//this.open();
//this.getWeeksInMonth();
//console.log("this.tjedan: ", this.tjedan);
},
render: function()
{
this.$el.html(this.template(_.extend(this.model.attributes, {model_cid: this.model.cid, tjedan: this.options.object.tjedan})));
console.log("this.render: ", this);
return this.$el;
},
useri: function()
{
console.log("this.model", this);
}
});
HTML
<div class="container-fluid">
<div class="row">
<div id="collection" class="col-md-12 sidebar">
<table class="table">
<thead id="weekView">
<script type="text/template" id="week-template">
<th>Users</th>
<% for(var i=0;i<tjedan.length;i++)%> {
<th class="list-group week" scope="row"><%= tjedan[i].dan + " " + tjedan[i].datum + "." + tjedan[i].mjesecBrojevi + "." %></th>
}%>
</script>
</thead>
<tbody id="userView">
</tbody>
<script type="text/template" id="user-template">
<th class="list-group model" scope="row" data-cid="<%= model_cid %>"><%= username %></th>
<% for(var i=0;i<tjedan.length;i++)%> {
<td id="<%= id + tjedan[i].dan + tjedan[i].datum %>" class="list-group" scope="row" data-id="<%= model_cid + '_' + tjedan[i].dan + tjedan[i].datum + tjedan[i].mjesecBrojevi %>"></td>
}%>
</script>
</table>
</div>
</div>
</div>

You need to create a view which will serve as the cell view and render each cell creating a new view.
Cell view
var CellView = Backbone.View.extend({
tagName: 'td',
className: 'list-group',
template: _.template('stuff inside your `td`'),
attributes: function() {
return {
id: this.model.get('your_choice'),
scope: 'row',
"data-id": this.whatever
};
},
events: {
"click": "onClick",
},
render: function() {
this.$el.empty().append(this.template(this.model.toJSON()));
return this;
},
onClick: function(e) {
// click on cell
}
});
Row view
var RowView = Backbone.View.extend({
tagName: 'tr',
template: _.template('<th class="list-group model" scope="row" data-cid="<%= model_cid %>"><%= username %></th>'),
initialize: function(options) {
this.options = _.extend({ /* default options */ }, options);
this.childViews = [];
},
render: function() {
// when using extend, the first object is modified, `toJSON` returns
// a shallow copy of the attributes, avoiding modifying them.
var data = _.extend(this.model.toJSON(), {
model_cid: this.model.cid,
tjedan: this.options.object.tjedan
});
this.$el.empty().append(this.template(data));
this.collection.each(this.renderCell, this);
return this; // render always return this for chaining.
},
renderCell: function(model) {
var view = new CellView({
model: model
});
this.childViews.push(view);
this.$el.append(view.render().el);
},
remove: function() {
// explicitely remove the views to avoid memory leaks with listeners.
_.invoke(this.childViews, 'remove');
}
});
This is just an example of how to render a view per cell, it doesn't properly take into account your models and every attributes in the templates.

Related

Accommodate multiple Backbone views, models and collections in the same page

I am struggling with displaying two models/collections in the same page.
<body>
<div id="mainContainer">
<div id="contentContainer"></div>
</div>
<div id="mainContainer2">
<div id="contentContainer2"></div>
</div>
<script id="list_container_tpl" type="text/template">
<div class="grid_5 listContainer">
<div class="box">
<h2 class="box_head grad_colour">Your tasks</h2>
<div class="sorting">Show: <select id="taskSorting"><option value="0">All Current</option><option value="1">Completed</option></select>
<input class="search round_all" id="searchTask" type="text" value="">
</div>
<div class="block">
<ul id="taskList" class="list"></ul>
</div>
</div>
</div>
</script>
<script id="list2_container_tpl" type="text/template">
<div class="grid_5 mylistContainer">
<div class="box">
<h2 class="box_head grad_colour">Your facets</h2>
<div class="sorting">
%{--Show: <select id="taskSorting"><option value="0">All Current</option><option value="1">Completed</option></select>--}%
<input class="search round_all" id="searchFacet" type="text" value="">
</div>
<div class="block">
<ul id="facetList" class="list"></ul>
</div>
</div>
</div>
</script>
<script id="task_item_tpl" type="text/template">
<li class="task">
<h4 class="name searchItem">{{ name }}</h4>
</li>
</script>
<script id="facet_item_tpl" type="text/template">
<li class="facet">
<h5 class="label searchItem">{{ label }}</h5>
</li>
</script>
<script>
var myapp = {
model: {},
view: {},
collection: {},
router: {}
};
var facetsSearch = {
model: {},
view: {},
collection: {},
router: {}
};
</script>
<script src="underscore-min.js"></script>
<script src="handlebars.min.js"></script>
<script src="backbone-min.js"></script>
<script>
/* avoid */
_.templateSettings = {
interpolate: /\{\{(.+?)\}\}/g
};
</script>
<script>
// model.tasks.js
myapp.model.Tasks = Backbone.Model.extend({
default:{
completed: 0,
name: ""
},
//url:"/js/libs/fixtures/task.json"
});
var tasks1 = new myapp.model.Tasks({
completed: 0,
name: "Clear dishes"
}
);
var tasks2 = new myapp.model.Tasks({
completed: 1,
name: "Get out the trash"
}
);
var tasks3 = new myapp.model.Tasks({
completed: 0,
name: "Do the laundry"
}
);
var tasks4 = new myapp.model.Tasks({
completed: 1,
name: "Vacuuming the carpet"
}
);
// collection.tasks.js
myapp.collection.Tasks = Backbone.Collection.extend({
currentStatus : function(status){
return _(this.filter(function(data) {
return data.get("completed") == status;
}));
},
search : function(letters){
if (letters == "") return this;
var pattern = new RegExp(letters,"gi");
return _(this.filter(function(data) {
return pattern.test(data.get("name"));
}));
}
});
myapp.collection.tasks = new myapp.collection.Tasks([tasks1, tasks2, tasks3, tasks4]);
// route.tasks.js
myapp.router.Tasks = Backbone.Router.extend({
routes: {
"": "list",
},
list: function(){
this.listContainerView = new myapp.view.TasksContainer({
collection: myapp.collection.tasks
});
$("#contentContainer").append(this.listContainerView.render().el);
this.listContainerView.sorts()
}
});
myapp.router.tasks = new myapp.router.Tasks;
<!-- render views -->
myapp.view.TasksContainer = Backbone.View.extend({
events: {
"keyup #searchTask" : "search",
"change #taskSorting" : "sorts"
},
render: function(data) {
$(this.el).html(this.template);
return this;
},
renderList : function(tasks){
$("#taskList").html("");
tasks.each(function(task){
var view = new myapp.view.TasksItem({
model: task,
collection: this.collection
});
$("#taskList").append(view.render().el);
});
return this;
},
initialize : function(){
this.template = _.template($("#list_container_tpl").html());
this.collection.bind("reset", this.render, this);
},
search: function(e){
var letters = $("#searchTask").val();
this.renderList(this.collection.search(letters));
},
sorts: function(e){
var status = $("#taskSorting").find("option:selected").val();
if (status == "") status = 0;
this.renderList(this.collection.currentStatus(status));
}
});
myapp.view.TasksItem = Backbone.View.extend({
events: {},
render: function(data) {
$(this.el).html(this.template(this.model.toJSON()));
console.log(this.model.toJSON(), "became", this.template(this.model.toJSON()));
return this;
},
initialize : function(){
this.template = _.template($("#task_item_tpl").html());
}
});
</script>
<script>
// model.facets.js
facetsSearch.model.Facets = Backbone.Model.extend({
default: {
id: 0,
label: "",
facetValues: []
}
});
var facet1 = new facetsSearch.model.Facets({
id: 1,
label: "Organism",
facetValues: ["Orga1", "Orga2"]
});
var facet2 = new facetsSearch.model.Facets({
id: 2,
label: "Omics",
facetValues: ["Omics1", "Omics2"]
});
var facet3 = new facetsSearch.model.Facets({
id: 3,
label: "Publication Date",
facetValues: ["2016-11-01", "2016-11-02"]
});
// collection.facets.js
facetsSearch.collection.Facets = Backbone.Collection.extend({
search : function(letters){
if (letters == "") return this;
/**
* the g modifier is used to perform a global match (find all matches rather than stopping after the first match).
* Tip: To perform a global, case-insensitive search, use this modifier together with the "i" modifier.
*/
var pattern = new RegExp(letters, "gi");
return _(this.filter(function(data) {
return pattern.test(data.get("label"));
}));
}
});
facetsSearch.collection.facets = new facetsSearch.collection.Facets([facet1, facet2, facet3]);
// route.facets.js
facetsSearch.router.Facets = Backbone.Router.extend({
routes: {
"": "list",
},
list: function(){
this.mylistContainerView = new facetsSearch.view.FacetsContainer({
collection: facetsSearch.collection.facets
});
console.log("Facet collection: ", facetsSearch.collection.facets);
$("#contentContainer2").append(this.mylistContainerView.render().el);
this.mylistContainerView.sorts()
}
});
facetsSearch.router.Facets = new facetsSearch.router.Facets;
facetsSearch.view.FacetsContainer = Backbone.View.extend({
events: {
"keyup #searchFacet" : "search",
"change #facetSorting": "sorts"
},
render: function(data) {
$(this.el).html(this.template);
return this;
},
renderList : function(facets){
$("#facetList").html("");
facets.each(function(facet){
var view2 = new facetsSearch.view.FacetsItem({
model: facet,
collection: this.collection
});
$("#facetList").append(view2.render().el);
});
return this;
},
initialize : function(){
this.template = _.template($("#list2_container_tpl").html());
this.collection.bind("reset", this.render, this);
},
search: function(e){
var letters = $("#searchFacet").val();
this.renderList(this.collection.search(letters));
},
sorts: function(e){
/*var status = $("#taskSorting").find("option:selected").val();
if (status == "") status = 0;
this.renderList(this.collection.currentStatus(status));*/
}
});
facetsSearch.view.FacetsItem = Backbone.View.extend({
events: {},
render: function(data) {
$(this.el).html(this.template(this.model.toJSON()));
console.log(this.model.toJSON(), "became", this.template(this.model.toJSON()));
return this;
},
initialize : function(){
this.template = _.template($("#facet_item_tpl").html());
}
});
</script>
<script>
Backbone.history.start();
</script>
</body>
The problem
To display Tasks above Your facets. I created two bunches of codes to render Tasks and Facets but modified the variable names respectively. Unfortunately, the former cannot be displayed.
As Emile mentioned in his detailed answer, your problem is that you're initializing multiple routers with the same route.
Since you seem to be beginning with Backbone, I'll give you a simpler answer than creating a complicated Layout (parent) view:
Just have a single handler for the specific route, and initialize both your views inside it.
It'll look something like:
myapp.router = Backbone.Router.extend({
routes: {
"": "list",
},
list: function() {
this.listContainerView = new myapp.view.TasksContainer({
collection: myapp.collection.tasks
});
$("#contentContainer").append(this.listContainerView.render().el);
this.listContainerView.sorts(); //this can be done inside the view
this.mylistContainerView = new facetsSearch.view.FacetsContainer({
collection: facetsSearch.collection.facets
});
$("#contentContainer2").append(this.mylistContainerView.render().el);
this.mylistContainerView.sorts(); //this can be done inside the view
}
});
You simply initialize 2 views in the same route.
You made 2 routers, both with an empty route. Each route is registered in Backbone.history, so when the facets router is initialized, its route overrides the tasks router route.
How to have multiple routers?
For the scope of your application, you should just start by making a single router, and handling the page with 2 lists within a parent view. Make a sort of Layout view for that page, which will handle the 2 lists:
var Layout = Backbone.View.extend({
template: _.template($('#layout-template').html()),
// keep the selector strings in a simple object
selectors: {
tasks: '.task-container',
facets: '.facet-container',
},
initialize: function() {
this.view = {
tasks: new TaskList(),
facets: new FacetList()
};
},
render: function() {
this.$el.html(this.template());
var views = this.views,
selectors = this.selectors;
this.$(selectors.tasks).append(views.tasks.render().el);
this.$(selectors.facets).append(views.facets.render().el);
return this;
}
});
Then, only one router:
var Router = Backbone.Router.extend({
routes: {
"": "list",
},
list: function() {
this.listContainerView = new Layout();
$("body").html(this.listContainerView.render().el);
}
});
This won't work with your code as-is, you'll have to incorporate the concepts yourself into your app.
Otherwise, if you really want multiple routers, you must understand that they can't share a route and that at any moment, only one route can be triggered.
When you have multiple routers, each manages the routes of a single module.
var TaskRouter = Backbone.Router.extend({
routes: {
'tasks': 'taskList',
'tasks/:id': 'taskDetails'
}
// ...snip...
});
var FacetsRouter = Backbone.Router.extend({
routes: {
'facets': 'facetList',
'facets/:id': 'facetDetails'
}
// ...snip...
});
Other improvements
Compile the template once
It's more efficient to compile the template once, when the view is being extended, than each time a new view is initialized.
myapp.view.TasksContainer = Backbone.View.extend({
// gets compiled once
template: _.template($("#list_container_tpl").html()),
initialize: function() {
// not here, as it gets compiled for each view
// this.template = _.template($("#list_container_tpl").html())
},
});
Avoid the global jQuery function
Avoid $(this.el) in favor of this.$el.
Avoid $('#divInTemplate') in favor of this.$('.divInTemplate'). It's a shortcut to this.$el.find.
See What is the difference between $el and el for additional informations.
Cache the jQuery objects
Whenever you want to select a child of the view's element, do it once and put the result in a variable.
render: function(data) {
this.$el.html(this.template);
// I like to namespace them inside an object.
this.elements = {
$list: this.$('.task-list'),
$search: this.$('.task-sorting')
};
// then werever you want to use them
this.elements.$list.toggleClass('active');
return this;
},
Use listenTo
Avoid bind/unbind and on/off/once (aliases) in favor of listenTo/stopListening/listenToOnce.
listenTo is an improved version of bind which solves problem with memory leaks.
this.collection.bind("reset", this.render, this);
// becomes
this.listenTo(this.collection, "reset", this.render);
Pass an array of objects to collection
myapp.collection.Tasks = Backbone.Collection.extend({
model: myapp.model.Tasks
// ...snip...
});
myapp.collection.tasks = new myapp.collection.Tasks([{
completed: 0,
name: "Clear dishes"
}, {
completed: 1,
name: "Get out the trash"
}, {
completed: 0,
name: "Do the laundry"
}, {
completed: 1,
name: "Vacuuming the carpet"
}]);
This would be enough, Backbone collection takes care of the rest.

Cannot get backbone view to render

I looping through a collection in an attempt to add a row to a table on every loop. Here is the code that loops the collection, and build the single view,
App.Views.OrganisationMembersTab = Backbone.View.extend({
el: '#members',
template: _.template( $('#tpl-members-tab-panel').html() ),
events: {
},
initialize: function() {
this.$el.html( this.template() );
this.render();
},
render: function() {
this.addAll();
},
addAll: function() {
this.collection.each( this.addOne, this);
},
addOne: function(model) {
console.log(model);
var tableRow = new App.Views.OrganisationsMemberRow({
model: model
});
tableRow.render();
}
});
The single view that gets called to build the row looks like this,
App.Views.OrganisationsMemberRow = Backbone.View.extend({
el: '.members-list tbody',
template: _.template($('#tpl-organisation-member-row').html() ),
events: {
},
initialize: function() {
},
render: function() {
this.$el.prepend( this.template({
member: this.model.toJSON()
}));
return this;
}
});
The model that is being used once it has been parsed to JSON using toJSON() looks like this,
email: "john.doe#email.com"
first_name: "John"
last_name: "Doe"
The template for the row looks like this,
<script type="text/template" id="tpl-members-tab-panel">
<table class="table table-striped members-list">
<thead>
<tr>
<th>A</th>
<th>B</th>
<th>C</th>
<th>D</th>
</tr>
</thead>
<tbody>
<tr>
<td colspan="4"><button class="btn btn-success btn-sm pull-right">Add &plus;</button></td>
</tr>
</tbody>
</table>
</script>
The above builds the main table components, and the next template is actually for a data row.
<script type="text/template" id="tpl-organisation-member-row">
<tr>
<td>#</td>
<td><%= first_name %> <%= last_name %></td>
<td>Admin <input type="checkbox" /></td>
<td>Remove</td>
</tr>
</script>
All I get output the the main table and then in the main tbody I get either nothing prepended or an empty <tr> why is this?
The problem is with your template which doesn't use member property, just use whole model instead.
You need replace
this.$el.prepend( this.template({
member: this.model.toJSON()
}));
with
this.$el.prepend( this.template(
this.model.toJSON()
));
working example
Your current implementation is a little confused. Your row view has no tagName so by default you'll be appending divs to your tbody.
The first thing I'd do is take the <tr> tag out of your tpl-organisation-member-row template and then alter your row view like so:
App.Views.OrganisationsMemberRow = Backbone.View.extend({
tagName: 'tr',
template: _.template($('#tpl-organisation-member-row').html() ),
render: function() {
this.$el.html(this.template(this.model.toJSON()));
return this;
}
});
Member row template:
<script type="text/template" id="tpl-organisation-member-row">
<td>#</td>
<td><%= first_name %> <%= last_name %></td>
<td>Admin <input type="checkbox" /></td>
<td>Remove</td>
</script>
Then I'd prefer to control appending the rows from your App.Views.OrganisationMembersTab view. So in your addOne method do the following:
addOne: function(){
var tableRow = new App.Views.OrganisationsMemberRow({
model: model
});
this.$('tbody').append(tableRow.render().el);
}

underscore.js template || bind/append backbone

I asked question the other day on this app; after some good advice, I moved on and I now think this is a different issue.
Before, I was not getting any display on the screen/no errors or any console.logs. After working on it some more, I now have my model/view and some of my render function working.
I think the issue is with my template or with my append. Below is the full code as it stands now. There are //comments where I think there maybe some issues.
Any help with this would be greatly appreciated.
EDIT :: Thanks for the advice Niranjan. I made some the changes you mentioned; I took away the counter and sample data. With these new changes, my newsFeed.js is no longer being read and so I am unclear as to how to populate my collection. When I console.log out my collection I get an empty array with my defaults shown, but with the json file not being read in the first place how do I get anything to work?
EDIT#2 :: Thank you again Niranjan. With the changes you suggested and a few of my own, I now have the code below. The issue I have right now, Is my array is being populated far too many times. the JSON file has 8 entries in total and because of my _.each statement in my template it is looping 8 times where I only want it to loop once and then to split the array into separate entries. I tried first splitting it during my response parse but this didn't work, do you have any advice for this?
below the code is links to the live views of code and html/broswer content including a link to the JSON file.
My end goal is to click on one title and have the corresponding content show.
(function(){
var NewsFeedModel = Backbone.Model.extend({
defaults: {
title: '',
content: ''
}
});
var NewsFeedCollection = Backbone.Collection.extend({
model: NewsFeedModel,
url : 'newsFeed.js',
parse: function(response) {
console.log('collection and file loaded');
return response.responseData.feed.entries;
}
});
var NewsFeedView = Backbone.View.extend({
el : '.newsContainer ul',
template: _.template($("#feedTemp").html()),
initialize: function(){
var scopeThis = this;
_.bindAll(this, 'render');
this.collection.fetch({
success: function(collection){
scopeThis.render();
}
});
this.collection.bind( 'add', this.render, this);
console.log('View and Template read');
},
render: function () {
this.$el.html(this.template({
feed: this.collection.toJSON()
}));
console.log(this.collection.toJSON());
}
});
var newsFeedCollection = new NewsFeedCollection();
var newsFeedView = new NewsFeedView({
collection: newsFeedCollection
});
var title = newsFeedCollection.find('title');
var content = newsFeedCollection.find('content > title');
$(document).on("click", "#add", function(title, content) {
console.log("I have been clicked");
if($(title) == $(content)){
console.log('they match');
}
else{
console.log('they dont match');
}
$('.hide').slideToggle("slow");
});
}());
This is my underscore template.
<div class="span12">
<script id="feedTemp" type="text/template">
<% _.each(feed, function(data) { %>
<div id = "titleContent">
<%= data.title %>
<div id="content" class="hide">
<%= data.content %>
</div>
</div>
<% }); %>
</script>
</div>
I am using google drive as a testing ground; links for the full html/code.
https://docs.google.com/file/d/0B0mP2FImEQ6qa3hFTG1YUXpQQm8/edit [code View]
https://googledrive.com/host/0B0mP2FImEQ6qUnFrU3lGcEplb2s/feed.html [browser View]
https://docs.google.com/file/d/0B0mP2FImEQ6qbnBtYnVTWnpheGM/edit [JSON file]
There are lot more things in your code that can be improved.
Here is the JSFIDDLE.
Please go through the comments mentioned in the code.
For trying out things in Underscore's template, check Underscore's Template Editor.
Template:
<button id=add>Add</button>
<div class="newsConatiner">
<ul></ul>
</div>
<script id="feedTemp">
<% _.each(feed, function(data) { %>
<div id = "titleContent">
<h2> <%= data.title %> </h2>
<div id="content">
<%= data.content %>
</div>
</div>
<% }); %>
</script>
Code:
(function () {
var NewsFeedModel = Backbone.Model.extend({
//url: 'newsFeed.js',
defaults: {
title: '',
content: ''
}
});
var NewsFeedCollection = Backbone.Collection.extend({
model: NewsFeedModel,
url: 'newsFeed.js',
parse: function (response) {
console.log('collection and file loaded');
return response.responseData.feed.entries;
}
});
var NewsFeedView = Backbone.View.extend({
el: '.newsConatiner',
//template should not be inside initialize
template: _.template($("#feedTemp").html()),
initialize: function () {
_.bindAll(this, 'render');
this.render();
//ADD event on collection
this.collection.bind('add', this.render, this);
console.log('View and Template read');
},
/*
This initialize will fetch collection data from newsFeed.js.
initialize: function () {
var self = this;
_.bindAll(this, 'render');
this.collection.fetch({
success: function(collection){
self.render();
}
});
//ADD event on collection
this.collection.bind('add', this.render, this);
console.log('View and Template read');
},
*/
render: function () {
//This is how you can render
//Checkout how this.collection is used
this.$el.html(this.template({
feed: this.collection.toJSON()
}));
}
});
//Initialized collection with sample data
var newsCounter = 0;
var newsFeedCollection = new NewsFeedCollection([{
title: 'News '+newsCounter++,
content: 'Content'
}]);
//Created view instance and passed collection
//which is then used in render as this.collection
var newsFeedView = new NewsFeedView({
collection: newsFeedCollection
});
$('#add').click(function(){
newsFeedCollection.add(new NewsFeedModel({
title: 'News ' + newsCounter++,
content: 'Content'
}));
});
}());

UI does not update when Updating ObservableArray

When a user clicks on a row from a list in the UI (html table tblAllCert), I have a click event that fires to populate another observable array that should populate a second html table (tblCertDetails). My click event fires, I can see data come back, and i can see data in the observable array, but my view does not update.
Here is an overview of the sequence in the code-
1. user clicks on row from html table tblAllCert, which fires selectThing method.
2. In viewmodel code, selectThing passes the row data from the row selected to the GetCertificateDetails(row) method.
3. GetCertificateDetails(row) method calls getCertDetails(CertificateDetails, source) function on my data service (the data service gets data from a web api). getCertDetails(CertificateDetails, source) function returns an observable array.
4. once the data is returned to selectThing, CertificateDetails observable array is populated. It does get data to this point.
Step 5 should be updating the UI (specifically tblCertDetails html table), however the UI does not get updated.
Here is my view-
<table id="tblAllCert" border="0" class="table table-hover" width="100%">
<tbody data-bind="foreach: allCertificates">
<tr id="AllCertRow" style="cursor: pointer" data-bind="click: $parent.selectThing, css: { highlight: $parent.isSelected() == $data.lwCertID }">
<td>
<ul style="width: 100%">
<b><span data-bind=" text: clientName"></span> (<span data-bind=" text: clientNumber"></span>) <span data-bind=" text: borrowBaseCount"></span> Loan(s) </b>
<br />
Collateral Analyst: <span data-bind=" text: userName"></span>
<br />
Certificate: <span data-bind="text: lwCertID"></span> Request Date: <span data-bind=" text: moment(requestDate).format('DD/MMM/YYYY')"></span>
</td>
</tr>
</tbody>
</table>
<table id="tblCertDetails" border="0" class="table table-hover" width="100%">
<tbody data-bind="foreach: CertificateDetails">
<tr id="Tr1" style="cursor: pointer">
<td>
<ul style="width: 100%">
<b>Loan: <span data-bind=" text: loanNum"></span>
</td>
</tr>
</tbody>
</table>
My viewmodel-
define(['services/logger', 'durandal/system', 'durandal/plugins/router', 'services/CertificateDataService'],
function (logger, system, router, CertificateDataService) {
var allCertificates = ko.observableArray([]);
var myCertificates = ko.observableArray([]);
var isSelected = ko.observable();
var serverSelectedOptionID = ko.observable();
var CertificateDetails = ko.observableArray([]);
var serverOptions = [
{ id: 1, name: 'Certificate', OptionText: 'lwCertID' },
{ id: 2, name: 'Client Name', OptionText: 'clientName' },
{ id: 3, name: 'Client Number', OptionText: 'clientNumber' },
{ id: 4, name: 'Request Date', OptionText: 'requestDate' },
{ id: 5, name: 'Collateral Analyst', OptionText: 'userName' }
];
var activate = function () {
// go get local data, if we have it
return SelectAllCerts(), SelectMyCerts();
};
var vm = {
activate: activate,
allCertificates: allCertificates,
myCertificates: myCertificates,
CertificateDetails: CertificateDetails,
title: 'Certificate Approvals',
SelectMyCerts: SelectMyCerts,
SelectAllCerts: SelectAllCerts,
theOptionId: ko.observable(1),
serverOptions: serverOptions,
serverSelectedOptionID: serverSelectedOptionID,
SortUpDownAllCerts: SortUpDownAllCerts,
isSelected: isSelected,
selectThing: function (row, event) {
CertificateDetails = GetCertificateDetails(row);
isSelected(row.lwCertID);
}
};
serverSelectedOptionID.subscribe(function () {
var sortCriteriaID = serverSelectedOptionID();
allCertificates.sort(function (a, b) {
var fieldname = serverOptions[sortCriteriaID - 1].OptionText;
if (a[fieldname] == b[fieldname]) {
return a[fieldname] > b[fieldname] ? 1 : a[fieldname] < b[fieldname] ? -1 : 0;
}
return a[fieldname] > b[fieldname] ? 1 : -1;
});
});
return vm;
function GetCertificateDetails(row) {
var source = {
'lwCertID': row.lwCertID,
'certType': row.certType,
}
return CertificateDataService.getCertDetails(CertificateDetails, source);
}
function SortUpDownAllCerts() {
allCertificates.sort();
}
function SelectAllCerts() {
return CertificateDataService.getallCertificates(allCertificates);
}
function SelectMyCerts() {
return CertificateDataService.getMyCertificates(myCertificates);
}
});
And releveant excerpt from my data service-
var getCertDetails = function (certificateDetailsObservable, source) {
var dataObservableArray = ko.observableArray([]);
$.ajax({
type: "POST",
dataType: "json",
url: "/api/caapproval/CertDtlsByID/",
data: source,
async: false,
success: function (dataIn) {
ko.mapping.fromJSON(dataIn, {}, dataObservableArray);
},
error: function (error) {
jsonValue = jQuery.parseJSON(error.responseText);
//jError('An error has occurred while saving the new part source: ' + jsonValue, { TimeShown: 3000 });
}
});
return dataObservableArray;
}
Ideas of why the UI is not updating?
When you're using Knockout arrays, you should be changing the contents of the array rather than the reference to the array itself. In selectThing, when you set
CertificateDetails = GetCertificateDetails(row);
the new observableArray that's been assigned to CertificateDetails isn't the same observableArray that KO bound to your table.
You're very close to a solution, though. In your AJAX success callback, instead of creating a new dataObservableArray and mapping into that, you can perform the mapping directly into parameter certificateDetailsObservable. ko.mapping.fromJSON should replace the contents of the table-bound array (you would also get rid of the assignment in selectThing).

Backbone.js - Get JSON array into view template

window.User = Backbone.Model.extend({
defaults: {
name: 'Jane',
friends: []
},
urlRoot: "users",
initialize: function(){
this.fetch();
}
});
var HomeView = Backbone.View.extend({
el: '#container',
template: _.template($("#home-template").html()),
render: function() {
$(this.el).html(this.template(this.model.toJSON()));
return this;
}
});
home: function() {
var user = new User({id: 1});
this.homeView = new HomeView({
model: user
});
this.homeView.render();
},
The model data is being queried and the root level attributes work fine, but the attribute that contains an array of other objects doesn't seem to show up.
Template:
<script id="home-template" type="text/template">
<div id="id">
<div class="name"><%= name %></div>
<br />
<h3> Single Friends</h3>
<br />
<ul data-role="listview" data-inset="true", data-filter="true">
<% _.each(friends, function(friend) { %>
<li>
<a href="/profile?id=<%= friend.id %>", data-ajax="false">
<div class="picture"><img src="http://graph.facebook.com/<%= friend.fb_user_id %>/picture"></div>
<div class="name"><%= friend.name %></div>
</a>
</li>
<% }); %>
</ul>
</div>
</script>
Return JSON:
{"name":"John Smith","friends":[{"id":"1234","name":"Joe Thompson","fb_user_id":"4564"},{"id":"1235","name":"Jane Doe","fb_user_id":"4564"}]}
It almost seems like it's not seeing the .friends attribute at all because it's taking the defaults of the model ([]).
Any suggestions?
You are calling render() before fetch() has returned the data from the server.
Try this?
window.User = Backbone.Model.extend({
defaults: {
name: 'Jane',
friends: []
},
urlRoot: "users"
});
var HomeView = Backbone.View.extend({
el: '#container',
template: _.template($("#home-template").html()),
initialize: function() {
this.model.fetch();
this.model.bind('change', this.render, this);
}
render: function() {
$(this.el).html(this.template(this.model.toJSON()));
return this;
}
});

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