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SubmarineMonitoring/common/plugin/map/ol/v6.12.0/examples/webgl-points-layer.html

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海底监测与灾害预警系统管理平台界面
2 weeks ago
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<title>WebGL points layer</title>
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This example uses OpenLayers v<span>6.12.0</span>. The <a id="latest-link" href="#" class="alert-link">latest</a> is v<span id="latest-version"></span>.
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<h4 id="title">WebGL points layer</h4>
<p class="tags">
<span class="badge-group">
<a
href="./index.html?q=webgl" class="badge badge-info">webgl</a
><a
class="badge badge-info tag-modal-toggle text-white"
data-toggle="modal"
data-target="#tag-example-list"
data-title="webgl"
data-content="
&lt;a class=&quot;list-group-item list-group-item-action&quot; href=&quot;./cog-stretch.html&quot;&gt;Band Contrast Stretch&lt;/a&gt;
&lt;a class=&quot;list-group-item list-group-item-action&quot; href=&quot;./cog-style.html&quot;&gt;Change Tile Layer Style&lt;/a&gt;
&lt;a class=&quot;list-group-item list-group-item-action&quot; href=&quot;./heatmap-earthquakes.html&quot;&gt;Earthquakes Heatmap&lt;/a&gt;
&lt;a class=&quot;list-group-item list-group-item-action&quot; href=&quot;./filter-points-webgl.html&quot;&gt;Filtering features with WebGL&lt;/a&gt;
&lt;a class=&quot;list-group-item list-group-item-action&quot; href=&quot;./icon-sprite-webgl.html&quot;&gt;Icon Sprites with WebGL&lt;/a&gt;
&lt;a class=&quot;list-group-item list-group-item-action&quot; href=&quot;./webgl-layer-swipe.html&quot;&gt;Layer Swipe (WebGL)&lt;/a&gt;
&lt;a class=&quot;list-group-item list-group-item-action&quot; href=&quot;./numpytile.html&quot;&gt;Rendering 16-bit NumpyTiles&lt;/a&gt;
&lt;a class=&quot;list-group-item list-group-item-action&quot; href=&quot;./webgl-sea-level.html&quot;&gt;Sea Level (with WebGL)&lt;/a&gt;
&lt;a class=&quot;list-group-item list-group-item-action&quot; href=&quot;./webgl-shaded-relief.html&quot;&gt;Shaded Relief (with WebGL)&lt;/a&gt;
&lt;a class=&quot;list-group-item list-group-item-action active&quot; href=&quot;./webgl-points-layer.html&quot;&gt;WebGL points layer&lt;/a&gt;
&lt;a class=&quot;list-group-item list-group-item-action&quot; href=&quot;./webgl-tile-style.html&quot;&gt;WebGL Tile Layer Styles&lt;/a&gt;
&lt;a class=&quot;list-group-item list-group-item-action&quot; href=&quot;./webgl-tiles.html&quot;&gt;WebGL Tiles&lt;/a&gt;"
tabindex="0"
>12</a>
</span>
<span class="badge-group">
<a
href="./index.html?q=point" class="badge badge-info">point</a
><a
class="badge badge-info tag-modal-toggle text-white"
data-toggle="modal"
data-target="#tag-example-list"
data-title="point"
data-content="
&lt;a class=&quot;list-group-item list-group-item-action&quot; href=&quot;./icon-sprite-webgl.html&quot;&gt;Icon Sprites with WebGL&lt;/a&gt;
&lt;a class=&quot;list-group-item list-group-item-action active&quot; href=&quot;./webgl-points-layer.html&quot;&gt;WebGL points layer&lt;/a&gt;"
tabindex="0"
>2</a>
</span>
<span class="badge-group">
<a
href="./index.html?q=layer" class="badge badge-info">layer</a
><a
class="badge badge-info tag-modal-toggle text-white"
data-toggle="modal"
data-target="#tag-example-list"
data-title="layer"
data-content="
&lt;a class=&quot;list-group-item list-group-item-action&quot; href=&quot;./layer-z-index.html&quot;&gt;Layer Z-Index&lt;/a&gt;
&lt;a class=&quot;list-group-item list-group-item-action&quot; href=&quot;./layer-zoom-limits.html&quot;&gt;Layer Zoom Limits&lt;/a&gt;
&lt;a class=&quot;list-group-item list-group-item-action&quot; href=&quot;./svg-layer.html&quot;&gt;SVG Layer&lt;/a&gt;
&lt;a class=&quot;list-group-item list-group-item-action active&quot; href=&quot;./webgl-points-layer.html&quot;&gt;WebGL points layer&lt;/a&gt;"
tabindex="0"
>4</a>
</span>
<span class="badge-group">
<a
href="./index.html?q=feature" class="badge badge-info">feature</a
><a
class="badge badge-info tag-modal-toggle text-white"
data-toggle="modal"
data-target="#tag-example-list"
data-title="feature"
data-content="
&lt;a class=&quot;list-group-item list-group-item-action&quot; href=&quot;./vector-esri.html&quot;&gt;ArcGIS REST Feature Service&lt;/a&gt;
&lt;a class=&quot;list-group-item list-group-item-action&quot; href=&quot;./box-selection.html&quot;&gt;Box Selection&lt;/a&gt;
&lt;a class=&quot;list-group-item list-group-item-action&quot; href=&quot;./feature-animation.html&quot;&gt;Custom Animation&lt;/a&gt;
&lt;a class=&quot;list-group-item list-group-item-action&quot; href=&quot;./custom-circle-render.html&quot;&gt;Custom Circle Render&lt;/a&gt;
&lt;a class=&quot;list-group-item list-group-item-action&quot; href=&quot;./custom-hit-detection-renderer.html&quot;&gt;Custom Hit Detection Render&lt;/a&gt;
&lt;a class=&quot;list-group-item list-group-item-action&quot; href=&quot;./custom-interactions.html&quot;&gt;Custom Interactions&lt;/a&gt;
&lt;a class=&quot;list-group-item list-group-item-action&quot; href=&quot;./vector-esri-edit.html&quot;&gt;Editable ArcGIS REST Feature Service&lt;/a&gt;
&lt;a class=&quot;list-group-item list-group-item-action&quot; href=&quot;./filter-points-webgl.html&quot;&gt;Filtering features with WebGL&lt;/a&gt;
&lt;a class=&quot;list-group-item list-group-item-action&quot; href=&quot;./flight-animation.html&quot;&gt;Flight Animation&lt;/a&gt;
&lt;a class=&quot;list-group-item list-group-item-action&quot; href=&quot;./feature-move-animation.html&quot;&gt;Marker Animation&lt;/a&gt;
&lt;a class=&quot;list-group-item list-group-item-action&quot; href=&quot;./translate-features.html&quot;&gt;Translate Features&lt;/a&gt;
&lt;a class=&quot;list-group-item list-group-item-action active&quot; href=&quot;./webgl-points-layer.html&quot;&gt;WebGL points layer&lt;/a&gt;"
tabindex="0"
>12</a>
</span>
</p>
<div class="modal modal-tag-example" id="tag-example-list" tabindex="-1" role="dialog" aria-labelledby="tag-example-title" aria-hidden="true">
<div class="modal-dialog modal-dialog-scrollable" role="document">
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<div class="modal-body">
<div class="list-group"></div>
</div>
</div>
</div>
</div>
<div id="map" class="map"></div>
Choose a predefined style from the list below or edit it as JSON manually.
<select id="style-select">
<option value="icons">Icons</option>
<option value="triangles">Triangles, color related to population</option>
<option value="triangles-latitude">Triangles, color related to latitude</option>
<option value="circles">Circles, size related to population</option>
<option value="circles-zoom">Circles, size related to zoom</option>
<option value="rotating-bars">Rotating bars</option>
</select>
<textarea style="width: 100%; height: 20rem; font-family: monospace; font-size: small;" id="style-editor"></textarea>
<small>
<span id="style-valid" style="display: none; color: forestgreen">✓ style is valid</span>
<span id="style-invalid" style="display: none; color: grey">✗ <span>style not yet valid...</span></span>
&nbsp;
</small>
</div>
<form method="POST" id="codepen-form" target="_blank" action="https://codesandbox.io/api/v1/sandboxes/define">
<input id="codesandbox-params" type="hidden" name="parameters">
</form>
</div>
<div class="row-fluid">
<div class="span12">
<p id="shortdesc">Using a WebGL-optimized layer to render a large quantities of points</p>
<div id="docs"><p>This example shows how to use a <code>WebGLPointsLayer</code> to show a large amount of points on the map. The layer is given a style in JSON format which allows a certain level of customization of the final reprensentation.
The following operators can be used:</p>
<ul>
<li><p>Reading operators:</p>
<ul>
<li><code>[&#39;get&#39;, &#39;attributeName&#39;]</code> fetches a feature attribute (it will be prefixed by <code>a_</code> in the shader)
Note: those will be taken from the attributes provided to the renderer</li>
<li><code>[&#39;var&#39;, &#39;varName&#39;]</code> fetches a value from the style variables, or 0 if undefined</li>
<li><code>[&#39;time&#39;]</code> returns the time in seconds since the creation of the layer</li>
<li><code>[&#39;zoom&#39;]</code> returns the current zoom level</li>
<li><code>[&#39;resolution&#39;]</code> returns the current resolution</li>
</ul>
</li>
<li><p>Math operators:</p>
<ul>
<li><code>[&#39;*&#39;, value1, value2]</code> multiplies <code>value1</code> by <code>value2</code></li>
<li><code>[&#39;/&#39;, value1, value2]</code> divides <code>value1</code> by <code>value2</code></li>
<li><code>[&#39;+&#39;, value1, value2]</code> adds <code>value1</code> and <code>value2</code></li>
<li><code>[&#39;-&#39;, value1, value2]</code> subtracts <code>value2</code> from <code>value1</code></li>
<li><code>[&#39;clamp&#39;, value, low, high]</code> clamps <code>value</code> between <code>low</code> and <code>high</code></li>
<li><code>[&#39;%&#39;, value1, value2]</code> returns the result of <code>value1 % value2</code> (modulo)</li>
<li><code>[&#39;^&#39;, value1, value2]</code> returns the value of <code>value1</code> raised to the <code>value2</code> power</li>
</ul>
</li>
<li><p>Transform operators:</p>
<ul>
<li><code>[&#39;case&#39;, condition1, output1, ...conditionN, outputN, fallback]</code> selects the first output whose corresponding
condition evaluates to <code>true</code>. If no match is found, returns the <code>fallback</code> value.
All conditions should be <code>boolean</code>, output and fallback can be any kind.</li>
<li><code>[&#39;match&#39;, input, match1, output1, ...matchN, outputN, fallback]</code> compares the <code>input</code> value against all
provided <code>matchX</code> values, returning the output associated with the first valid match. If no match is found,
returns the <code>fallback</code> value.
<code>input</code> and <code>matchX</code> values must all be of the same type, and can be <code>number</code> or <code>string</code>. <code>outputX</code> and
<code>fallback</code> values must be of the same type, and can be of any kind.</li>
<li><code>[&#39;interpolate&#39;, interpolation, input, stop1, output1, ...stopN, outputN]</code> returns a value by interpolating between
pairs of inputs and outputs; <code>interpolation</code> can either be <code>[&#39;linear&#39;]</code> or <code>[&#39;exponential&#39;, base]</code> where <code>base</code> is
the rate of increase from stop A to stop B (i.e. power to which the interpolation ratio is raised); a value
of 1 is equivalent to <code>[&#39;linear&#39;]</code>.
<code>input</code> and <code>stopX</code> values must all be of type <code>number</code>. <code>outputX</code> values can be <code>number</code> or <code>color</code> values.
Note: <code>input</code> will be clamped between <code>stop1</code> and <code>stopN</code>, meaning that all output values will be comprised
between <code>output1</code> and <code>outputN</code>.</li>
</ul>
</li>
<li><p>Logical operators:</p>
<ul>
<li><code>[&#39;&lt;&#39;, value1, value2]</code> returns <code>true</code> if <code>value1</code> is strictly lower than <code>value2</code>, or <code>false</code> otherwise.</li>
<li><code>[&#39;&lt;=&#39;, value1, value2]</code> returns <code>true</code> if <code>value1</code> is lower than or equals <code>value2</code>, or <code>false</code> otherwise.</li>
<li><code>[&#39;&gt;&#39;, value1, value2]</code> returns <code>true</code> if <code>value1</code> is strictly greater than <code>value2</code>, or <code>false</code> otherwise.</li>
<li><code>[&#39;&gt;=&#39;, value1, value2]</code> returns <code>true</code> if <code>value1</code> is greater than or equals <code>value2</code>, or <code>false</code> otherwise.</li>
<li><code>[&#39;==&#39;, value1, value2]</code> returns <code>true</code> if <code>value1</code> equals <code>value2</code>, or <code>false</code> otherwise.</li>
<li><code>[&#39;!=&#39;, value1, value2]</code> returns <code>true</code> if <code>value1</code> does not equal <code>value2</code>, or <code>false</code> otherwise.</li>
<li><code>[&#39;!&#39;, value1]</code> returns <code>false</code> if <code>value1</code> is <code>true</code> or greater than <code>0</code>, or <code>true</code> otherwise.</li>
<li><code>[&#39;between&#39;, value1, value2, value3]</code> returns <code>true</code> if <code>value1</code> is contained between <code>value2</code> and <code>value3</code>
(inclusively), or <code>false</code> otherwise.</li>
</ul>
</li>
<li><p>Conversion operators:</p>
<ul>
<li><code>[&#39;array&#39;, value1, ...valueN]</code> creates a numerical array from <code>number</code> values; please note that the amount of
values can currently only be 2, 3 or 4.</li>
<li><code>[&#39;color&#39;, red, green, blue, alpha]</code> creates a <code>color</code> value from <code>number</code> values; the <code>alpha</code> parameter is
optional; if not specified, it will be set to 1.
Note: <code>red</code>, <code>green</code> and <code>blue</code> components must be values between 0 and 255; <code>alpha</code> between 0 and 1.
Values can either be literals or another operator, as they will be evaluated recursively.
Literal values can be of the following types:</li>
</ul>
</li>
<li><p><code>boolean</code></p>
</li>
<li><p><code>number</code></p>
</li>
<li><p><code>string</code></p>
</li>
</ul>
</div>
</div>
</div>
<div class="row-fluid">
<h5 class="source-heading">main.js</h5>
<pre><code id="example-js-source" class="language-js">import 'ol/ol.css';
import GeoJSON from &#x27;ol/format/GeoJSON&#x27;;
import Map from &#x27;ol/Map&#x27;;
import OSM from &#x27;ol/source/OSM&#x27;;
import TileLayer from &#x27;ol/layer/Tile&#x27;;
import Vector from &#x27;ol/source/Vector&#x27;;
import View from &#x27;ol/View&#x27;;
import WebGLPointsLayer from &#x27;ol/layer/WebGLPoints&#x27;;
const vectorSource &#x3D; new Vector({
url: &#x27;data/geojson/world-cities.geojson&#x27;,
format: new GeoJSON(),
});
const predefinedStyles &#x3D; {
&#x27;icons&#x27;: {
symbol: {
symbolType: &#x27;image&#x27;,
src: &#x27;data/icon.png&#x27;,
size: [18, 28],
color: &#x27;lightyellow&#x27;,
rotateWithView: false,
offset: [0, 9],
},
},
&#x27;triangles&#x27;: {
symbol: {
symbolType: &#x27;triangle&#x27;,
size: 18,
color: [
&#x27;interpolate&#x27;,
[&#x27;linear&#x27;],
[&#x27;get&#x27;, &#x27;population&#x27;],
20000,
&#x27;#5aca5b&#x27;,
300000,
&#x27;#ff6a19&#x27;,
],
rotateWithView: true,
},
},
&#x27;triangles-latitude&#x27;: {
symbol: {
symbolType: &#x27;triangle&#x27;,
size: [
&#x27;interpolate&#x27;,
[&#x27;linear&#x27;],
[&#x27;get&#x27;, &#x27;population&#x27;],
40000,
12,
2000000,
24,
],
color: [
&#x27;interpolate&#x27;,
[&#x27;linear&#x27;],
[&#x27;get&#x27;, &#x27;latitude&#x27;],
-60,
&#x27;#ff14c3&#x27;,
-20,
&#x27;#ff621d&#x27;,
20,
&#x27;#ffed02&#x27;,
60,
&#x27;#00ff67&#x27;,
],
offset: [0, 0],
opacity: 0.95,
},
},
&#x27;circles&#x27;: {
symbol: {
symbolType: &#x27;circle&#x27;,
size: [
&#x27;interpolate&#x27;,
[&#x27;linear&#x27;],
[&#x27;get&#x27;, &#x27;population&#x27;],
40000,
8,
2000000,
28,
],
color: &#x27;#006688&#x27;,
rotateWithView: false,
offset: [0, 0],
opacity: [
&#x27;interpolate&#x27;,
[&#x27;linear&#x27;],
[&#x27;get&#x27;, &#x27;population&#x27;],
40000,
0.6,
2000000,
0.92,
],
},
},
&#x27;circles-zoom&#x27;: {
symbol: {
symbolType: &#x27;circle&#x27;,
size: [&#x27;interpolate&#x27;, [&#x27;exponential&#x27;, 2.5], [&#x27;zoom&#x27;], 2, 1, 14, 32],
color: &#x27;#240572&#x27;,
offset: [0, 0],
opacity: 0.95,
},
},
&#x27;rotating-bars&#x27;: {
symbol: {
symbolType: &#x27;square&#x27;,
rotation: [&#x27;*&#x27;, [&#x27;time&#x27;], 0.1],
size: [
&#x27;array&#x27;,
4,
[
&#x27;interpolate&#x27;,
[&#x27;linear&#x27;],
[&#x27;get&#x27;, &#x27;population&#x27;],
20000,
4,
300000,
28,
],
],
color: [
&#x27;interpolate&#x27;,
[&#x27;linear&#x27;],
[&#x27;get&#x27;, &#x27;population&#x27;],
20000,
&#x27;#ffdc00&#x27;,
300000,
&#x27;#ff5b19&#x27;,
],
offset: [
&#x27;array&#x27;,
0,
[
&#x27;interpolate&#x27;,
[&#x27;linear&#x27;],
[&#x27;get&#x27;, &#x27;population&#x27;],
20000,
2,
300000,
14,
],
],
},
},
};
const map &#x3D; new Map({
layers: [
new TileLayer({
source: new OSM(),
}),
],
target: document.getElementById(&#x27;map&#x27;),
view: new View({
center: [0, 0],
zoom: 2,
}),
});
let literalStyle;
let pointsLayer;
function refreshLayer(newStyle) {
const previousLayer &#x3D; pointsLayer;
pointsLayer &#x3D; new WebGLPointsLayer({
source: vectorSource,
style: newStyle,
disableHitDetection: true,
});
map.addLayer(pointsLayer);
if (previousLayer) {
map.removeLayer(previousLayer);
previousLayer.dispose();
}
literalStyle &#x3D; newStyle;
}
const spanValid &#x3D; document.getElementById(&#x27;style-valid&#x27;);
const spanInvalid &#x3D; document.getElementById(&#x27;style-invalid&#x27;);
function setStyleStatus(errorMsg) {
const isError &#x3D; typeof errorMsg &#x3D;&#x3D;&#x3D; &#x27;string&#x27;;
spanValid.style.display &#x3D; errorMsg &#x3D;&#x3D;&#x3D; null ? &#x27;initial&#x27; : &#x27;none&#x27;;
spanInvalid.firstElementChild.innerText &#x3D; isError ? errorMsg : &#x27;&#x27;;
spanInvalid.style.display &#x3D; isError ? &#x27;initial&#x27; : &#x27;none&#x27;;
}
const editor &#x3D; document.getElementById(&#x27;style-editor&#x27;);
editor.addEventListener(&#x27;input&#x27;, function () {
const textStyle &#x3D; editor.value;
try {
const newLiteralStyle &#x3D; JSON.parse(textStyle);
if (JSON.stringify(newLiteralStyle) !&#x3D;&#x3D; JSON.stringify(literalStyle)) {
refreshLayer(newLiteralStyle);
}
setStyleStatus(null);
} catch (e) {
setStyleStatus(e.message);
}
});
const select &#x3D; document.getElementById(&#x27;style-select&#x27;);
select.value &#x3D; &#x27;circles&#x27;;
function onSelectChange() {
const style &#x3D; select.value;
const newLiteralStyle &#x3D; predefinedStyles[style];
editor.value &#x3D; JSON.stringify(newLiteralStyle, null, 2);
try {
refreshLayer(newLiteralStyle);
setStyleStatus();
} catch (e) {
setStyleStatus(e.message);
}
}
onSelectChange();
select.addEventListener(&#x27;change&#x27;, onSelectChange);
// animate the map
function animate() {
map.render();
window.requestAnimationFrame(animate);
}
animate();
</code></pre>
</div>
<div class="row-fluid">
<h5 class="source-heading">index.html</h5>
<pre><code id="example-html-source" class="language-markup">&lt;!DOCTYPE html&gt;
&lt;html lang="en"&gt;
&lt;head&gt;
&lt;meta charset="UTF-8"&gt;
&lt;title&gt;WebGL points layer&lt;/title&gt;
&lt;!-- Pointer events polyfill for old browsers, see https://caniuse.com/#feat=pointer --&gt;
&lt;script src="https://unpkg.com/elm-pep"&gt;&lt;/script&gt;
&lt;!-- The lines below are only needed for old environments like Internet Explorer and Android 4.x --&gt;
&lt;script src="https://cdn.polyfill.io/v3/polyfill.min.js?features=fetch,requestAnimationFrame,Element.prototype.classList,TextDecoder"&gt;&lt;/script&gt;
&lt;script src="https://cdnjs.cloudflare.com/ajax/libs/core-js/3.18.3/minified.js"&gt;&lt;/script&gt;
&lt;style&gt;
.map {
width: 100%;
height:400px;
}
&lt;/style&gt;
&lt;/head&gt;
&lt;body&gt;
&lt;div id&#x3D;&quot;map&quot; class&#x3D;&quot;map&quot;&gt;&lt;/div&gt;
Choose a predefined style from the list below or edit it as JSON manually.
&lt;select id&#x3D;&quot;style-select&quot;&gt;
&lt;option value&#x3D;&quot;icons&quot;&gt;Icons&lt;/option&gt;
&lt;option value&#x3D;&quot;triangles&quot;&gt;Triangles, color related to population&lt;/option&gt;
&lt;option value&#x3D;&quot;triangles-latitude&quot;&gt;Triangles, color related to latitude&lt;/option&gt;
&lt;option value&#x3D;&quot;circles&quot;&gt;Circles, size related to population&lt;/option&gt;
&lt;option value&#x3D;&quot;circles-zoom&quot;&gt;Circles, size related to zoom&lt;/option&gt;
&lt;option value&#x3D;&quot;rotating-bars&quot;&gt;Rotating bars&lt;/option&gt;
&lt;/select&gt;
&lt;textarea style&#x3D;&quot;width: 100%; height: 20rem; font-family: monospace; font-size: small;&quot; id&#x3D;&quot;style-editor&quot;&gt;&lt;/textarea&gt;
&lt;small&gt;
&lt;span id&#x3D;&quot;style-valid&quot; style&#x3D;&quot;display: none; color: forestgreen&quot;&gt;✓ style is valid&lt;/span&gt;
&lt;span id&#x3D;&quot;style-invalid&quot; style&#x3D;&quot;display: none; color: grey&quot;&gt;✗ &lt;span&gt;style not yet valid...&lt;/span&gt;&lt;/span&gt;
&amp;nbsp;
&lt;/small&gt;
&lt;script src="main.js"&gt;&lt;/script&gt;
&lt;/body&gt;
&lt;/html&gt;</code></pre>
</div>
<div class="row-fluid">
<h5 class="source-heading">package.json</h5>
<pre><code id="example-pkg-source" class="language-json">{
&quot;name&quot;: &quot;webgl-points-layer&quot;,
&quot;dependencies&quot;: {
&quot;ol&quot;: &quot;6.12.0&quot;
},
&quot;devDependencies&quot;: {
&quot;parcel&quot;: &quot;^2.0.0&quot;
},
&quot;scripts&quot;: {
&quot;start&quot;: &quot;parcel index.html&quot;,
&quot;build&quot;: &quot;parcel build --public-url . index.html&quot;
}
}</code></pre>
</div>
</div>
<script src="https://code.jquery.com/jquery-3.5.1.min.js"></script>
<script src="https://maxcdn.bootstrapcdn.com/bootstrap/4.5.0/js/bootstrap.bundle.min.js"></script>
<script src="./resources/prism/prism-1.20.0.min.js"></script>
<script src="./resources/common.js"></script>
<script src="common.js"></script>
<script src="webgl-points-layer.js"></script>
<script>
$('#tag-example-list').on('show.bs.modal', function (event) {
const button = $(event.relatedTarget); // Button that triggered the modal
const title = button.data('title');
const content = button.data('content');
const modal = $(this)
modal.find('.modal-title').text(title);
modal.find('.modal-body').html(content);
});
var packageUrl = 'https://raw.githubusercontent.com/openlayers/openlayers.github.io/build/package.json';
fetch(packageUrl).then(function(response) {
return response.json();
}).then(function(json) {
var latestVersion = json.version;
document.getElementById('latest-version').innerHTML = latestVersion;
var url = window.location.href;
var branchSearch = url.match(/\/([^\/]*)\/examples\//);
var cookieText = 'dismissed=-' + latestVersion + '-';
var dismissed = document.cookie.indexOf(cookieText) != -1;
if (branchSearch && !dismissed && /^v[0-9\.]*$/.test(branchSearch[1]) && '6.12.0' != latestVersion) {
var link = url.replace(branchSearch[0], '/latest/examples/');
fetch(link, {method: 'head'}).then(function(response) {
var a = document.getElementById('latest-link');
a.href = response.status == 200 ? link : '../../latest/examples/';
});
var latestCheck = document.getElementById('latest-check');
latestCheck.style.display = '';
document.getElementById('latest-dismiss').onclick = function() {
latestCheck.style.display = 'none';
document.cookie = cookieText;
}
}
});
</script>
</body>
</html>