The goal
of this blog entry is to explain how you can create a simple master/detail view by using the WinJS ListView and Template controls. In particular, I explain how you can use a ListView
control to display a list
of movies and how you can use a Template
control to display the details
of the selected movie.
Creating a master/detail view requires completing the following four steps:
Create the data source – The data source contains the list
of movies.
Declare the ListView
control – The ListView
control displays the entire list
of movies. It is the master part
of the master/detail view.
Declare the Details Template
control – The Details Template
control displays the details for the selected movie. It is the details part
of the master/detail view.
Handle the selectionchanged event – You handle the selectionchanged event to display the details for a movie when a new movie is selected.
Creating the Data Source
There is nothing special about our data source. We initialize a WinJS.Binding.List object to represent a list
of movies:
(function () {
"use strict";
var movies = new WinJS.Binding.List([
{ title: "Star Wars", director: "Lucas"},
{ title: "Shrek", director: "Adamson" },
{ title: "Star Trek", director: "Abrams" },
{ title: "Spiderman", director: "Raimi" },
{ title: "Memento", director: "Nolan" },
{ title: "Minority Report", director: "Spielberg" }
]);
// Expose the data source
WinJS.Namespace.define("ListViewDemos", {
movies: movies
});
})();
The data source is exposed to the rest
of our application with the name ListViewDemos.movies.
Declaring the ListView
Control
The ListView
control is declared with the following markup:
<div id="movieList"
data-win-control="WinJS.UI.ListView"
data-win-options="{
itemDataSource: ListViewDemos.movies.dataSource,
itemTemplate: select('#masterItemTemplate'),
tapBehavior: 'directSelect',
selectionMode: 'single',
layout: { type: WinJS.UI.ListLayout }
}">
</div>
The data-win-options attribute is used to set the following properties
of the ListView control:
itemDataSource – The ListView is bound to the list
of movies which we created in the previous section. Notice that the ListView is bound to ListViewDemos.movies.dataSource and not just ListViewDemos.movies.
itemTemplate – The item template contains the template used for rendering each item in the ListView. The markup for this template is included below.
tabBehavior – This enumeration determines what happens when you tap or click on an item in the ListView. The possible values are directSelect, toggleSelect, invokeOnly, none. Because we want to handle the selectionchanged event, we set tapBehavior to the value directSelect.
selectionMode – This enumeration determines whether you can select multiple items or only a single item. The possible values are none, single, multi. In the code above, this property is set to the value single.
layout – You can use ListLayout or GridLayout with a ListView. If you want to display a vertical ListView, then you should select ListLayout.
You must associate a ListView with an item template if you want to render anything interesting. The ListView above is associated with an item template named #masterItemTemplate. Here’s the markup for the masterItemTemplate:
<div id="masterItemTemplate" data-win-control="WinJS.Binding.Template">
<div class="movie">
<span data-win-bind="innerText:title"></span>
</div>
</div>
This template simply renders the title
of each movie.
Declaring the Details Template
Control
The details part
of the master/detail view is created with the help
of a Template
control. Here’s the markup used to declare the Details Template control:
<div id="detailsTemplate" data-win-control="WinJS.Binding.Template">
<div>
<div>
Title:
<span data-win-bind="innerText:title"></span>
</div>
<div>
Director:
<span data-win-bind="innerText:director"></span>
</div>
</div>
</div>
The Details Template
control displays the movie title and director.
Handling the selectionchanged Event
The ListView
control can raise two types
of events: the iteminvoked and selectionchanged events. The iteminvoked event is raised when you click on a ListView item. The selectionchanged event is raised when one or more ListView items are selected.
When you set the tapBehavior property
of the ListView
control to the value “directSelect” then tapping or clicking a list item raised both the iteminvoked and selectionchanged event. Tapping a list item causes the item to be selected and the item appears with a checkmark.
In our code, we handle the selectionchanged event to update the movie details Template when you select a new movie.
Here’s the code from the default.js file used to handle the selectionchanged event:
var movieList = document.getElementById("movieList");
var detailsTemplate = document.getElementById("detailsTemplate");
var movieDetails = document.getElementById("movieDetails");
// Setup selectionchanged handler
movieList.winControl.addEventListener("selectionchanged", function (evt) {
if (movieList.winControl.selection.count() > 0) {
movieList.winControl.selection.getItems().then(function (items) {
// Clear the template container
movieDetails.innerHTML = "";
// Render the template
detailsTemplate.winControl.render(items[0].data, movieDetails);
});
}
});
The code above sets up an event handler (listener) for the selectionchanged event. The event handler first verifies that an item has been selected in the ListView (selection.count() > 0). Next, the details for the movie are rendered using the movie details Template (we created this Template in the previous section).
The Complete Code
For the sake
of completeness, I’ve included the complete code for the master/detail view below. I’ve included both the default.html, default.js, and movies.js files.
Here is the final code for the default.html file:
<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8">
<title>ListViewMasterDetail</title>
<!-- WinJS references -->
<link href="//Microsoft.WinJS.0.6/css/ui-dark.css" rel="stylesheet">
<script src="//Microsoft.WinJS.0.6/js/base.js"></script>
<script src="//Microsoft.WinJS.0.6/js/ui.js"></script>
<!-- ListViewMasterDetail references -->
<link href="/css/default.css" rel="stylesheet">
<script src="/js/default.js"></script>
<script type="text/javascript" src="js/movies.js"></script>
<style type="text/css">
body {
font-size: xx-large;
}
.movie {
padding: 5px;
}
#masterDetail {
display: -ms-box;
}
#movieList {
width: 300px;
margin: 20px;
}
#movieDetails {
margin: 20px;
}
</style>
</head>
<body>
<!-- Templates -->
<div id="masterItemTemplate" data-win-control="WinJS.Binding.Template">
<div class="movie">
<span data-win-bind="innerText:title"></span>
</div>
</div>
<div id="detailsTemplate" data-win-control="WinJS.Binding.Template">
<div>
<div>
Title:
<span data-win-bind="innerText:title"></span>
</div>
<div>
Director:
<span data-win-bind="innerText:director"></span>
</div>
</div>
</div>
<!-- Master/Detail -->
<div id="masterDetail">
<!-- Master -->
<div id="movieList"
data-win-control="WinJS.UI.ListView"
data-win-options="{
itemDataSource: ListViewDemos.movies.dataSource,
itemTemplate: select('#masterItemTemplate'),
tapBehavior: 'directSelect',
selectionMode: 'single',
layout: { type: WinJS.UI.ListLayout }
}">
</div>
<!-- Detail -->
<div id="movieDetails"></div>
</div>
</body>
</html>
Here is the default.js file:
(function () {
"use strict";
var app = WinJS.Application;
app.onactivated = function (eventObject) {
if (eventObject.detail.kind === Windows.ApplicationModel.Activation.ActivationKind.launch) {
WinJS.UI.processAll();
var movieList = document.getElementById("movieList");
var detailsTemplate = document.getElementById("detailsTemplate");
var movieDetails = document.getElementById("movieDetails");
// Setup selectionchanged handler
movieList.winControl.addEventListener("selectionchanged", function (evt) {
if (movieList.winControl.selection.count() > 0) {
movieList.winControl.selection.getItems().then(function (items) {
// Clear the template container
movieDetails.innerHTML = "";
// Render the template
detailsTemplate.winControl.render(items[0].data, movieDetails);
});
}
});
}
};
app.start();
})();
Here is the movies.js file:
(function () {
"use strict";
var movies = new WinJS.Binding.List([
{ title: "Star Wars", director: "Lucas"},
{ title: "Shrek", director: "Adamson" },
{ title: "Star Trek", director: "Abrams" },
{ title: "Spiderman", director: "Raimi" },
{ title: "Memento", director: "Nolan" },
{ title: "Minority Report", director: "Spielberg" }
]);
// Expose the data source
WinJS.Namespace.define("ListViewDemos", {
movies: movies
});
})();
Summary
The purpose
of this blog entry was to describe how to create a simple master/detail view by taking advantage
of the WinJS ListView
control. We handled the selectionchanged event
of the ListView
control to display movie details when you select a movie in the ListView.
