count method
Collapse the table of content
Expand the table of content

ISelection.count method

Applies to Windows and Windows Phone

Returns the number of items in the selection.

Syntax


var number = iSelection.count();

Parameters

This method has no parameters.

Return value

Type: Number

The number of items in the selection.

Examples

This example demonstrates how to use the selection property to select all items in a ListView, clear the selection, and display the number of items selected.


<!DOCTYPE html>
<html>
<head>
    <meta charset="utf-8" />
    <title>selectionExample</title>

    <!-- WinJS references -->
    <link href="//Microsoft.WinJS.2.0/css/ui-light.css" rel="stylesheet" />
    <script src="//Microsoft.WinJS.2.0/js/base.js"></script>
    <script src="//Microsoft.WinJS.2.0/js/ui.js"></script>

    <link href="selectionExample.css" rel="stylesheet" />
    <script src="selectionExample.js"></script>
    <script src="/js/data.js"></script>
</head>
<body>
        <div id="mediumListIconTextTemplate" data-win-control="WinJS.Binding.Template">
            <div style="width: 282px; height: 70px; padding: 5px; overflow: hidden; display: -ms-grid;">

                <!-- Displays the "picture" field. -->
                <img data-win-bind="alt: title; src: picture"
                    src="#"
                    style="width: 60px; height: 60px; margin: 5px; -ms-grid-column: 1;" />
                <div style="margin: 5px; -ms-grid-column: 2">

                    <!-- Displays the "title" field. -->
                    <h4 data-win-bind="innerText: title"></h4>

                    <!-- Displays the "text" field. -->
                    <h6 data-win-bind="innerText: text"></h6>
                </div>
            </div>
        </div>

        <div id="selectionExampleListView" data-win-control="WinJS.UI.ListView"
            data-win-options="{itemDataSource : DataExample.itemList.dataSource, 
            itemTemplate: select('#mediumListIconTextTemplate'),
            tapBehavior: 'toggleSelect',
            layout : {type: WinJS.UI.GridLayout}}">
        </div>

        <button id="selectAllButton">Select all</button>
        <button id="clearSelection">Clear selection</button>
        <p>Items selected:</p>
        <p id="outputParagraph"></p>
</body>
</html>



(function () {
    "use strict";

    var lView;
    var outputParagraph;


    WinJS.UI.Pages.define("/pages/selection/selectionExample.html", {
        // This function is called whenever a user navigates to this page. It
        // populates the page elements with the app's data.
        ready: function (element, options) {

            lView = element.querySelector("#selectionExampleListView").winControl;
            outputParagraph = element.querySelector("#outputParagraph");
            lView.addEventListener("selectionchanged", this.selectionChanged); 

            element.querySelector("#selectAllButton").addEventListener("click", this.selectAllClicked);
            element.querySelector("#clearSelection").addEventListener("click", this.clearSelection);
            
        },

        unload: function () {
 
        },

        updateLayout: function (element, viewState, lastViewState) {
 
        },

        selectAllClicked: function (eventInfo) {
            lView.selection.selectAll();
        },

        clearSelection: function (eventInfo) {
            lView.selection.clear();
        },

        selectionChanged: function (eventInfo) {
            outputParagraph.innerText = lView.selection.count(); 
        }
    });

})();


Requirements

Minimum WinJS version

WinJS 3.0

Namespace

WinJS.UI

See also

ISelection
ListView.selection

 

 

Show:
© 2017 Microsoft