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Panning and Scrolling in Windows Store Apps

Posted by Deepak Arora Articles | Windows Store Apps November 09, 2012
In this app I described panning and scrolling an image in a Windows Store app using JavaScript.
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Introduction

In this article I describe how to create a Windows Store App for panning and scrolling large images using JavaScript. Panning and scrolling is used to allow an end-user to reach additional content that otherwise would not fit into a view. There are a few types of panning and scrolling to consider:

  1. Horizontal: User can move content left/right.
  2. Vertical: User can move content up/down both axes.
  3. Unrailed: User is free to move the content in any direction.
  4. Railed: User motion is locked to an axis, if close enough to the axis.

With the new ms-overflow-style property, you can control the type of scrollbar and when it appears.

I assume you can create a simple Windows Store App using JavaScript. For more help visit Simple Windows Store Apps using JavaScript.

To start the creation of the app, add two JavaScript pages by right-clicking on the js folder in the Solution Explorer and select Add > new item > JavaScript Page and then give an appropriate name. In the same way, add one HTML page to your project.

panning-in-windows-store-apps.jpg

Write the following code in default.html:

<!DOCTYPE html>

<html>

<head>

    <meta charset="utf-8" />

    <title></title>

    <link rel="stylesheet" href="//Microsoft.WinJS.1.0/css/ui-light.css" />

    <script src="//Microsoft.WinJS.1.0/js/base.js"></script>

    <script src="//Microsoft.WinJS.1.0/js/ui.js"></script>

    <link rel="stylesheet" href="/css/default.css" />

    <script src="/js/script1.js"></script>

    <script src="/js/default.js"></script>

</head>

<body role="application">

    <div id="rootGrid">

        <div id="content">

            <h1 id="featureLabel"></h1>

            <div id="contentHost"></div>

        </div>

    </div>

</body>

</html>

Write the following code in default.js:
 

(function () {

    "use strict";

    var AppTitle = "";

    var pages = [

 

        { url: "page.html" }

    ];

    function activated(eventObject) {

        if (eventObject.detail.kind === Windows.ApplicationModel.Activation.ActivationKind.launch) {

            eventObject.setPromise(WinJS.UI.processAll().then(function () {

                var url = WinJS.Application.sessionState.lastUrl || pages[0].url;

                return WinJS.Navigation.navigate(url);

            }));

        }

    }

    WinJS.Navigation.addEventListener("navigated", function (eventObject) {

        var url = eventObject.detail.location;

        var host = document.getElementById("contentHost");

        host.winControl && host.winControl.unload && host.winControl.unload();

        WinJS.Utilities.empty(host);

        eventObject.detail.setPromise(WinJS.UI.Pages.render(url, host, eventObject.detail.state).then(function () {

            WinJS.Application.sessionState.lastUrl = url;

        }));

    });

    WinJS.Namespace.define("app", {

        AppTitle: AppTitle,

        pages: pages

    });

    WinJS.Application.addEventListener("activated", activated, false);

    WinJS.Application.start();

})();


Write the following code in page.html:

<!DOCTYPE html>

<html>

<head>

    <title></title>

    <link rel="stylesheet" href="/css/panning.css" />

    <link rel="stylesheet" href="/css/default.css" />

    <script src="/js/script.js"></script>

</head>

<body>

    <div data-win-control="app.pageInput">

        <div id="selectGrid">

            <label id="PanningTypeLabel">Select:</label>

            <select size="1" id="PanningType" aria-labelledby="PanningTypeLabel">

                <option selected="selected" value="None">None</option>

                <option value="Horizontal">Horizontal</option>

                <option value="Vertical">Vertical</option>

                <option value="Unrailed">Unrailed</option>

                <option value="Railed">Railed</option>

            </select>

            <br />

            <label id="ScrollbarStyleLabel">Set style:</label>

            <select size="1" id="ScrollbarStyle" aria-labelledby="ScrollbarStyleLabel">

                <option selected="selected" value="none">none</option>

                <option selected="selected" value="scrollbar">scrollbar</option>

                <option selected="selected" value="-ms-autohiding-scrollbar">-ms-autohiding-scrollbar</option>

            </select>

        </div>

    </div>

    <div data-win-control="app.pageOutput">

        <div id="page1_Scroller" class="ManipulationContainer None">

            <img alt="abc" src="/images/abc.jpg" class="row1 col1" />

        </div>

    </div>

</body>

</html> 


Write the following code in script.js:

(function () {

    "use strict";

    var page = WinJS.UI.Pages.define("page.html", {

        processed: function (element, options) {

            document.getElementById("PanningType").addEventListener("change", changePanningType, false);

            document.getElementById("ScrollbarStyle").addEventListener("change", changeOverflowStyle, false);

        }

    });

    function changePanningType(changedEvent) {

        var myScrollElement = document.getElementById("page1_Scroller");

        var panType = changedEvent.target.options.value;

        myScrollElement.className = "ManipulationContainer " + panType;

    }

    function changeOverflowStyle(changedEvent) {

        var myScrollElement = document.getElementById("page1_Scroller");

        myScrollElement.style["-ms-overflow-style"] = changedEvent.target.options.value;

    }

})();


Write the following code in script1.js:

(function () {

    var pageOutput = WinJS.Class.define(

        function (element, options) {

            element.winControl = this;

            this.element = element;

            new WinJS.Utilities.QueryCollection(element)

                        .setAttribute("role", "region")

                        .setAttribute("aria-labelledby", "outputLabel")

                        .setAttribute("aria-live", "assertive");

            element.id = "output";

 

            this._addOutputLabel(element);

            this._addStatusOutput(element);

        }, {

            _addOutputLabel: function (element) {

                var label = document.createElement("h2");

                label.id = "outputLabel";

                label.textContent = "Output";

                element.parentNode.insertBefore(label, element);

            },

            _addStatusOutput: function (element) {

                var statusDiv = document.createElement("div");

                statusDiv.id = "statusMessage";

                element.insertBefore(statusDiv, element.childNodes[0]);

            }

        }

    );

    var currentpageUrl = null;

 

    WinJS.Navigation.addEventListener("navigating", function (evt) {

        currentpageUrl = evt.detail.location;

    });

 

    WinJS.log = function (message, tag, type) {

        var statusDiv = document.getElementById("statusMessage");

    };

    function activated(e) {

        WinJS.Utilities.query("#featureLabel")[0].textContent = app.AppTitle;

    }

 

    WinJS.Application.addEventListener("activated", activated, false);

    WinJS.Namespace.define("app", {

        pageOutput: pageOutput

    });

})(); 

Output:

scrooling-in-windows-store-apps1.jpg

Summary

In this app I described panning and scrolling an image in a Windows Store app using JavaScript. I hope this article has helped you to understand this topic. Please share if you know more about this. Your feedback and constructive contributions are welcome.

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