knockout multi view using templates - javascript

I have a list of products where the name is a link to the product's details view. The list of products is the "Results" view
Samsumg
iPhone
When the user clicks on a product, the "Details" template is shown, and the "Results" template is not shown; at least that is the behavior that I want.
I am using the following code to accomplish this behavior, and have the jsFiddle here http://jsfiddle.net/justinnafe/mLf5G/:
<div data-bind="template: displayMode"></div>
<script type="text/html" id="Result">
<ul data-bind="foreach: products">
<li></li>
</ul>
</script>
<script type="text/html" id="Details">
<p data-bind="text: name"></p>
<p data-bind="text: description"></p>
</script>
and the javascript:
var view = {
name: "Result"
};
var initialProducts = [{
name: "Samsumg",
description: "The best phone"
},{
name: "iPhone",
description: "The other best phone"
}];
var viewModel = (function (){
var products = ko.observableArray(initialProducts),
displayMode = ko.observable(view),
switchDisplayMode = function(item){
if (displayMode() == 'Result') {
displayMode({ name: "Details", data: item });
}
else {
displayMode({ name: "Result", data: item });
}
};
return {
products: products,
displayMode: displayMode,
switchDisplayMode: switchDisplayMode
};
})();
ko.applyBindings(viewModel);
I am trying to pass that product to the Details template, but have been unsuccessful. Any clues or tips would be helpful.
I am currently getting a "ReferenceError: products is not defined" error when I click on a link, but not sure how to fix it. Maybe if I fix that error, the switching views will behave as expected.

In your function to switch the template, you are forgetting that your displayMode observable is holding an object - not a string value.
So inside switchDisplayMode, displayMode() = { name: 'Result' }. Switching that to displayMode().name fixes the problem. See updated fiddle

Related

KO visible not working with template

Goal:
use KO to show/hide folder, sub-folder, and files, as recursive UL LI list. When a user click on the folders, the child items under that folder will toggle hide/show.
Problem:
The recursive part is ok. But it does not do toggle. console.log says error that 'show' is undefined. Any idea what went wrong ?
Code
<script type="text/javascript">
$(function() {
ko.applyBindings(viewModel,document.getElementById('resources-panel'));
});
var viewModel = {
treeRoot: ko.observableArray()
};
var FileElement = function(ppp_name, ppp_type, ppp_children) {
var self = this;
self.ppp_children = ko.observableArray(ppp_children);
self.ppp_name = ko.observable(ppp_name);
self.ppp_type = ko.observable(ppp_type);
self.show = ko.observable(false);
self.toggle=function() {
self.show(!self.show());
}
}
var tree = [
new FileElement("IT Dept", "folder",[
new FileElement("IT Overview.docx", "file",[]),
new FileElement("IT Server1", "folder",[
new FileElement("IT Server1 Configuration Part 1.docx", "file", []),
new FileElement("IT Server1 Configuration Part 2.docx", "file", []),
]),
new FileElement("IT Server2", "folder",[])
]),
new FileElement("HR Dept", "folder", [])
];
viewModel.treeRoot(tree);
</script>
<script id="FileElement" type="text/html">
<ul>
<li>
<a href="#" data-bind="click: toggle" class="action-link"><br/>
<span data-bind="text: ppp_name"></span>
</a>
<ul data-bind="template: { name: 'FileElement', slideVisible: show, foreach: ppp_children }" ></ul>
</li>
</ul>
</script>
<div id="resources-panel" data-bind="template: { name: 'FileElement', slideVisible: show, foreach: $data.treeRoot }"></div>
Your top level binding context is the treeRoot, and treeRoot doesn't have a "show" property it's just a simple array so you probably want to remove that first show binding altogether
<div id="resources-panel" data-bind="template: { name: 'FileElement', foreach: $data.treeRoot }"></div>
Then within the FileElement template you'll want to move the show binding to the outside of the template binding like f_martinez suggested
<ul data-bind="slideVisible: show, template: { name: 'FileElement', foreach: ppp_children }" ></ul>
Here's an example jsFiddle

Angular - can I use a single function on multiple objects within a nested ng-repeat that triggers the ng-show of just that object?

SUMMARYI have a list of brands and a list of products. I am using an ng-repeat to show the list of brands, and an ng-repeat with a filter to show the list of products within their respective brands. I want each brand and each product to have a button that shows more about that brand/product. All of these buttons should use the same function on the controller.
PROBLEMThe button that shows more about the brand also shows more about each of that brand's products, UNLESS (this is the weird part to me) I click the button of a product within that brand first, in which case it will work correctly.
CODEPlease see the Plunker here, and note that when you click on 'show type' on a brand, it also shows all the types of the products within that brand: http://plnkr.co/edit/gFnq3O3f0YYmBAB6dcwe?p=preview
HTML
<!DOCTYPE html>
<html>
<head>
<link rel="stylesheet" href="style.css">
<script src="script.js"></script>
</head>
<body>
<div ng-app="myApp">
<div ng-controller="MyController as vm">
<div ng-repeat="brand in brands">
<h1>
{{brand.name}}
</h1>
<button ng-click="showType(brand)">
Show Brand Type
</button>
<div ng-show="show">
{{brand.type}}
</div>
<div ng-repeat="product in products
| filter:filterProducts(brand.name)">
<h2>
{{product.name}}
</h2>
<button ng-click="showType(product)">
Show Product Type
</button>
<div ng-show="show">
{{product.type}}
</div>
</div>
</div>
</div>
</div>
<script src="https://ajax.googleapis.com/ajax/libs/angularjs/1.4.3/angular.min.js"></script>
<script src="script.js"></script>
</body>
</html>
JAVASCRIPT
var app = angular.module('myApp', []);
app.controller('MyController', function($scope) {
$scope.brands = [{
name: 'Kewl',
type: 'Cereal'
}, {
name: 'Joku',
type: 'Toy'
}, {
name: 'Loko',
type: 'Couch'
}]
$scope.products = [{
name: 'Kewlio',
type: 'Sugar Cereal',
brand: 'Kewl'
}, {
name: 'Kewliano',
type: 'Healthy Cereal',
brand: 'Kewl'
}, {
name: 'Jokurino',
type: 'Rattle',
brand: 'Joku'
}, {
name: 'Lokonoko',
type: 'Recliner',
brand: 'Loko'
}, {
name: 'Lokoboko',
type: 'Love Seat',
brand: 'Loko'
}]
$scope.showType = function(item) {
this.show = !this.show;
}
$scope.filterProducts = function(brand) {
return function(value) {
if(brand) {
return value.brand === brand;
} else {
return true;
}
}
}
});
IMPORTANT NOTE: I realize I could add an attribute to the object (brand.show) and pass the object into the function, then change that attribute to true/false, but I don't want to do this because in my actual application, the button will show a form that edits the brand/product and submits the info to Firebase, and I don't want the object to have a 'show' attribute on it. I would rather not have to delete the 'show' attribute every time I want to edit the info in Firebase.
ng-repeat directive create own scope, when you do
this.show = !this.show
you create/change show property in current scope, if click brand button - for brand scope, that global for product, and when click in product button - for scope concrete product.
To avoid this, you should create this property before clicking button, for example with ng-init, like
ng-init="show=false;"
on element with `ng-repeat" directive
Sample
var app = angular.module('myApp', []);
app.controller('MyController', function($scope) {
$scope.brands = [{
name: 'Kewl',
type: 'Cereal'
}, {
name: 'Joku',
type: 'Toy'
}, {
name: 'Loko',
type: 'Couch'
}]
$scope.products = [{
name: 'Kewlio',
type: 'Sugar Cereal',
brand: 'Kewl'
}, {
name: 'Kewliano',
type: 'Healthy Cereal',
brand: 'Kewl'
}, {
name: 'Jokurino',
type: 'Rattle',
brand: 'Joku'
}, {
name: 'Lokonoko',
type: 'Recliner',
brand: 'Loko'
}, {
name: 'Lokoboko',
type: 'Love Seat',
brand: 'Loko'
}]
$scope.showType = function(item) {
this.show = !this.show;
}
$scope.filterProducts = function(brand) {
return function(value) {
if (brand) {
return value.brand === brand;
} else {
return true;
}
}
}
});
/* Styles go here */
h1 {
font-family: impact;
}
h2 {
font-family: arial;
color: blue;
margin-bottom: 0;
}
<script src="https://ajax.googleapis.com/ajax/libs/angularjs/1.4.8/angular.js"></script>
<div ng-app="myApp">
<div ng-controller="MyController as vm">
<div ng-repeat="brand in brands" ng-init="show=false">
<h1>
{{brand.name}}
</h1>
<button ng-click="showType(brand)">
Show Brand Type
</button>
<div ng-show="show">
{{brand.type}}
</div>
<div ng-repeat="product in products
| filter:filterProducts(brand.name)" ng-init="show=false">
<h2>
{{product.name}}
</h2>
<button ng-click="showType(product)">
Show Product Type
</button>
<div ng-show="show">
{{product.type}}
</div>
</div>
</div>
</div>
</div>
The easiest fix for this, if you don't mind putting temporary properties in your data is the following changes:
<div ng-show="product.show">
{{product.type}}
</div>
and
<div ng-show="brand.show">
{{brand.type}}
</div>
and then in your controller
$scope.showType = function(item) {
item.show = !item.show;
}
Alternatively, if you don't want to touch the object properties, you can create an $scope.shownTypes array and have your click either push the object into or remove the object from the shown array. THen you can check for the object's existence in the array and show or not show the type appropriately. Let me know if you need a sample of that.
Your show boolean attribute same for whole tree (is in same scope). Using angular directive with child scope scope:true in ng-repeat helps to isolate each show property. I have forked your plunker code:
http://plnkr.co/edit/cMSvyfeCQOnTKG8F4l55?p=preview

How to push items in a nested array with AngularJs

I'm looking for two things:
To push items in a nested array with Angularjs
To understand how it works exactly.
I've been looking for answers on differents previous topic but I didn't manage to come to a solution.
Actually, I want to use an Add Item button to push an item in a items array under a facture object.
Here is my controller:
PlasmaCrm.controller('FacturesSoloController', function($scope, $stateParams, Facture ) {
Facture.get({ id: $stateParams.factureId }, function(data) {
$scope.facture = data;
});
$scope.ajouterItem = function(index, item){
$scope.facture.items[index].item.push({
description: 'Test'
});
}
});
And here is my data structure (as returned by my API)
{
"id":10200,
"client_id":1,
"lead_id":1,
"courtedescription":"Description test",
"etat":"En attente",
"created_at":"2015-02-21 15:07:17",
"updated_at":"2015-02-21 15:07:17",
"items":[
{
"id":1,
"facture_id":10200,
"description":"Item num\u00e9ro 1",
"prix":"15.00",
"tps":"0.75",
"tvq":"1.50",
"grandtotal":"17.25",
"created_at":"2015-02-21 15:07:18",
"updated_at":"2015-02-21 15:07:18"
},
{
"id":2,
"facture_id":10200,
"description":"Deuxi\u00e8me item quoi",
"prix":"135.00",
"tps":"6.75",
"tvq":"13.47",
"grandtotal":"155.22",
"created_at":"2015-02-21 15:07:18",
"updated_at":"2015-02-21 15:07:18"
}
]
}
Of course my HTML contains a button:
<form ng-submit="ajouterItem(item)">
<button class="btn btn-primary">Ajouter un item</button>
</form>
Actually I got an error (undefined) when I press to button. What is wrong?
For those who are still looking for pushing data in the nested array can refer below example of Comments and Replies :
<!DOCTYPE html>
<html>
<script src="http://ajax.googleapis.com/ajax/libs/angularjs/1.4.8/angular.min.js"></script>
<body>
<div ng-app="myApp" ng-controller="myCtrl">
<!--Comment section-->
<ul ng-repeat="comment in comments track by $index" style="background: skyblue; padding: 10px;">
<li>
<b>Comment {{$index}} : </b>
<br>
{{comment.comment}}
<!--Reply section-->
<ul ng-repeat="reply in comment.reply track by $index">
<li><i>Reply {{$index}} :</i><br>
{{reply.comment}}</li>
</ul>
<!--End reply section-->
<input type="text" ng-model="reply" placeholder=" Write your reply." />Reply
</li>
</ul>
<!--End comment section -->
<!--Post your comment-->
<b>New comment</b>
<input type="text" placeholder="Your comment" ng-model="comment" />
Post
</div>
<script>
var app = angular.module('myApp', []);
app.controller('myCtrl', function ($scope) {
//Comments object having reply oject
$scope.comments = [{ comment: 'hi', reply: [{ comment: 'hi inside commnet' }, { comment: 'hi inside commnet' }] }];
//push reply
$scope.insertReply = function (index, reply) {
$scope.comments[index].reply.push({ comment: reply });
}
//push commnet
$scope.newComment = function (comment) {
$scope.comments.push({ comment: comment, reply: [] });
}
});
</script>
</body>
</html>
Since there is no item property inside the items array objects, you cant push to it. You have to add:
$scope.facture.items[index].item = []
before you can push to it. Also check your functions parameters as Marc states in his comment. Since we can't see all of the markup it is unclear what is passed to the function, a simple console.log() will show you that ofcourse.
I found the answer, it was finaly simpler than I first thought:
$scope.ajouterItem = function(){
$scope.facture.items.push({
description: 'Test'
});
}
First, create a variable to fill, delete, and add items. Next, assign this variable to the array inside the model.
PlasmaCrm.controller('FacturesSoloController', function($scope, $stateParams, Facture )
{
$scope.items= [];
Facture.get({ id: $stateParams.factureId }, function(data) {
$scope.facture = data;
$scope.items = $scope.facture.items;
});
$scope.ajouterItem = function(item){
$scope.items.push(item);
$scope.facture.Items = $scope.items;
}
});
In this way, you can also edit the previous information and add new information. Since we first set "items". To remove the same as usual :
$scope.RemoveItem = function (index) {
$scope.facture.Items.splice(index, 1);
};

Link to nested resource loses active class after page reload

I'm learning ember these days and I encountered a problem with link-to helper. If I use it to create a link for nested route it works fine (if click on the link, "active" class will be added to the element - as described in docs) until I reload the page. When I reload the page the content for nested rouse will be loaded to the {{outlet}} properly but link will lose its "active" class. What am I doing wrong?
JavaScript:
window.App = Ember.Application.create({ rootElement: '#app' });
App.Router.map(function () {
this.resource('notes', { path: '/' }, function () {
this.route('show', { path: '/:note_id' });
});
});
App.NotesRoute = Em.Route.extend({
model: function () {
return App.Note.find();
}
});
App.NotesShowRoute = Em.Route.extend({
model: function (params) {
return App.Note.find(params.note_id);
}
});
App.Note = Em.Object.extend();
App.Note.reopenClass({
find: function(id) {
var notes = [
{
id: 1,
title: 'abc',
text: 'lorem ipsum text 1111111'
},
{
id: 2,
title: 'def',
text: 'lorem ipsum text 2222222'
}
];
return id ? notes[parseInt(id) - 1] : notes;
}
});
HTML:
<div id="app" class="row">
<script type="text/x-handlebars">
<div class="col-md-2">
<h2>Tags</h2>
</div>
{{outlet}}
</script>
</div>
<script type="text/x-handlebars" data-template-name="notes">
<div class="col-md-3">
<h2>Notes</h2>
{{#each}}
{{#link-to 'notes.show' this}}{{title}}{{/link-to}}
{{/each}}
</div>
{{outlet}}
</script>
<script type="text/x-handlebars" data-template-name="notes/show">
<div class="col-md-7">
<h2>{{title}}</h2>
<p>{{text}}</p>
</div>
</script>
When you click a link-to, it passes the object to the new route. So the model lookup isn't called. So both the context of the show route and the linked object refer to the same object. So it will get marked as active.
However, when you refresh the page, you're doing the lookup twice, once in the NotesRoute model (which you loop over with each), and once in the NotesShowRoute model.
Javascript objects are reference types. Two plain javascript objects aren't considered equal, even if their content is the same. e.g. try typing this into your javascript console.
{ one: 1, two: 2} == {one: 1, two: 2}
So the object referred to in the link-to isn't the same as the model of the current route. So the equality check for the link being active won't work.
Quick solution is to stop the find from creating the object every time. e.g.
App.Note.reopenClass({
all: [
{
id: 1,
title: 'abc',
text: 'lorem ipsum text 1111111'
},
{
id: 2,
title: 'def',
text: 'lorem ipsum text 2222222'
}
],
find: function(id) {
return id ? this.all[parseInt(id) - 1] : this.all;
}
});
Another options is to roll some sort of identity map for your objects. Here is a blog post doing a much better example than I can of explaining it.
Note I haven't actually tested that code because I'm too lazy to create a jsbin. But let me know if it doesn't work.

Knockout mapping - Uniquely identifying nested objects using keys

The Knockout mapping plugin documentation has a section entitled "Uniquely identifying objects using “keys”". This describes how to update part of an object and then only update that part of the display rather than completely replacing the display of all properties of a partially-modified object. That all works splendidly in their simple example, which I have slightly modified here to make my question more clear. My modifications were to:
Replace the object with a corrected name after a 2 second delay.
Highlight the unchanging part of the display, so you can see that it is actually not replaced when the update happens.
1. Simple object (jsFiddle)
<h1 data-bind="text: name"></h1>
<ul data-bind="foreach: children">
<li><span class="id" data-bind="text: id"></span> <span data-bind="text: name"></span></li>
</ul>
<script>
var data = {
name: 'Scot',
children: [
{id : 1, name : 'Alicw'}
]
};
var mapping = {
children: {
key: function(data) {
console.log(data);
return ko.utils.unwrapObservable(data.id);
}
}
};
var viewModel = ko.mapping.fromJS(data, mapping);
ko.applyBindings(viewModel);
var range = document.createRange();
range.selectNode(document.getElementsByClassName("id")[0]);
window.getSelection().addRange(range);
setTimeout(function () {
var data = {
name: 'Scott',
children: [
{id : 1, name : 'Alice'}
]
};
ko.mapping.fromJS(data, viewModel);
}, 2000);
</script>
But what isn't clear to me is how I would achieve the same behavior for a more complex nested data structure. In the following example, I took the above code and wrapped the data in a list. I would like this to behave the same as above, but it doesn't. The whole display is redone because of the change in one property. You can see this because, unlike the above example, the highlighting is lost after the data is updated.
2. More complex nested object (jsFiddle)
<!-- ko foreach: parents -->
<h1 data-bind="text: name"></h1>
<ul data-bind="foreach: children">
<li><span class="id" data-bind="text: id"></span> <span data-bind="text: name"></span></li>
</ul>
<!-- /ko -->
<script>
var data = {
parents: [
{
name: 'Scot',
children: [
{id : 1, name : 'Alicw'}
]
}
]
};
var mapping = {
children: {
key: function(data) {
console.log(data);
return ko.utils.unwrapObservable(data.id);
}
}
};
var viewModel = ko.mapping.fromJS(data, mapping);
ko.applyBindings(viewModel);
var range = document.createRange();
range.selectNode(document.getElementsByClassName("id")[0]);
window.getSelection().addRange(range);
setTimeout(function () {
var data = {
parents: [
{
name: 'Scott',
children: [
{id : 1, name : 'Alice'}
]
}
]
};
ko.mapping.fromJS(data, viewModel);
}, 2000);
</script>
So basically what I'm asking is, how can I make the second example work like the first, given the more nested data structure? You can assume that ids are unique for each child (so if I added another parent besides Scott, his children would start with id=2, etc.).
Interesting observation there and nice write-up. It appears to work if you define a key on the parent as well as the child. Try this fiddle:
http://jsfiddle.net/8QJe7/6/
It defines instantiable view model functions for the parents and children, where the parent constructor does its child mappings.

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