[examples] add an accessible-panel example
This commit is contained in:
Éric Lemoine
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<!DOCTYPE html>
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<html>
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<head>
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<meta http-equiv="Content-Type" content="text/html; charset=utf-8">
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<meta name="viewport" content="width=device-width, initial-scale=1.0, maximum-scale=1.0, user-scalable=0">
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<meta name="apple-mobile-web-app-capable" content="yes">
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<title>Custom and accessible panel</title>
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<link rel="stylesheet" href="../theme/default/style.css" type="text/css">
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<link rel="stylesheet" href="style.css" type="text/css">
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<style type="text/css">
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.olControlPanel button {
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position: relative;
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display: block;
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margin: 2px;
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border: 1px solid;
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padding: 0 5px;
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border-radius: 4px;
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height: 35px;
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background-color: white;
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float: left;
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overflow: visible; /* needed to remove padding from buttons in IE */
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}
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.olControlPanel button span {
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padding-left: 25px;
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}
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.olControlPanel button span:first-child {
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padding-left: 0;
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display: block;
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position: absolute;
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left: 2px;
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}
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.olControlPanel .olControlDrawFeatureItemActive span:first-child {
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background-image: url("../theme/default/img/draw_line_on.png");
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height: 22px;
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width: 24px;
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top: 5px;
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}
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.olControlPanel .olControlDrawFeatureItemInactive span:first-child {
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background-image: url("../theme/default/img/draw_line_off.png");
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height: 22px;
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width: 24px;
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top: 5px;
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}
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.olControlPanel .olControlZoomBoxItemInactive span:first-child {
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background-image: url("../img/drag-rectangle-off.png");
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height: 29px;
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width: 29px;
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top: 2px;
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}
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.olControlPanel .olControlZoomBoxItemActive span:first-child {
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background-image: url("../img/drag-rectangle-on.png");
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height: 29px;
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width: 29px;
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top: 2px;
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}
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.olControlPanel .olControlZoomToMaxExtentItemInactive span:first-child {
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background-image: url("../img/zoom-world-mini.png");
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height: 18px;
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width: 18px;
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top: 8px;
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}
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.olControlPanel .navHistory span:first-child {
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background-image: url("../theme/default/img/navigation_history.png");
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height: 24px;
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width: 24px;
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top: 4px;
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}
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.olControlPanel .navHistoryPreviousItemActive span:first-child {
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background-position: 0 0;
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}
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.olControlPanel .navHistoryPreviousItemInactive span:first-child {
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background-position: 0 -24px;
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}
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.olControlPanel .navHistoryNextItemActive span:first-child {
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background-position: -24px 0;
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}
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.olControlPanel .navHistoryNextItemInactive span:first-child {
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background-position: -24px -24px;
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}
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</style>
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<script src="../lib/OpenLayers.js"></script>
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<script src="accessible-panel.js"></script>
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</head>
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<body onload="init()">
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<h1 id="title">Custom and accessible panel</h1>
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<div id="tags">
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panels, CSS, style, accessibility, button
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</div>
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<p id="shortdesc">
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Create a custom and accessible panel, styled entirely with
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CSS.
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</p>
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<div id="panel"></div>
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<div id="map" class="smallmap"></div>
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<div id="docs">
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<p>Accessibility:
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<ul>
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<li>The buttons are actual HTML buttons. You can therefore
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use the TAB key to give the focus to the panel's buttons, and the "ENTER"
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key to activate or trigger the corresponding control.</li>
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<li>The buttons include text and titles (displayed when a button
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is hovered).</li>
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<li>If you remove colors from the page (for example using FireFox's <a
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href="https://addons.mozilla.org/en-US/firefox/addon/no-color/">No
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Color extension</a>) the buttons are still visible, and
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accessible using the keyboard.</li>
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</ul>
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</p>
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<p>By default a panel creates buttons as divs. In this example the
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<code>createControlMarkup</code> panel function is overridden to create
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a more accessible markup for the buttons. See the <a
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href="accessible-panel.js" target="_blank"> accessible-panel.js
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source</a> to see how this is done.</p>
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</div>
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</body>
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</html>
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var lon = 5;
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var lat = 40;
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var zoom = 5;
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var map, layer;
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function init() {
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map = new OpenLayers.Map( 'map', { controls: [] } );
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layer = new OpenLayers.Layer.WMS( "OpenLayers WMS",
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"http://vmap0.tiles.osgeo.org/wms/vmap0", {layers: 'basic'} );
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map.addLayer(layer);
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vlayer = new OpenLayers.Layer.Vector( "Editable" );
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map.addLayer(vlayer);
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zb = new OpenLayers.Control.ZoomBox({
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title: "Zoom box: zoom clicking and dragging",
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text: "Zoom"
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});
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var panel = new OpenLayers.Control.Panel({
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defaultControl: zb,
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createControlMarkup: function(control) {
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var button = document.createElement('button'),
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iconSpan = document.createElement('span'),
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textSpan = document.createElement('span');
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iconSpan.innerHTML = ' ';
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button.appendChild(iconSpan);
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if (control.text) {
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textSpan.innerHTML = control.text;
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}
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button.appendChild(textSpan);
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return button;
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}
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});
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panel.addControls([
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zb,
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new OpenLayers.Control.DrawFeature(vlayer, OpenLayers.Handler.Path,
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{title:'Draw a feature', text: 'Draw'}),
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new OpenLayers.Control.ZoomToMaxExtent({
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title:"Zoom to the max extent",
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text: "World"
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})
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]);
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nav = new OpenLayers.Control.NavigationHistory({
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previousOptions: {
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title: "Go to previous map position",
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text: "Prev"
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},
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nextOptions: {
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title: "Go to next map position",
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text: "Next"
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},
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displayClass: "navHistory"
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});
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// parent control must be added to the map
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map.addControl(nav);
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panel.addControls([nav.next, nav.previous]);
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map.addControl(panel);
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map.setCenter(new OpenLayers.LonLat(lon, lat), zoom);
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}
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