99 lines
1.9 KiB
JavaScript
99 lines
1.9 KiB
JavaScript
import ImageLayer from '../src/ol/layer/Image.js';
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import ImageWMS from '../src/ol/source/ImageWMS.js';
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import Map from '../src/ol/Map.js';
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import View from '../src/ol/View.js';
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/**
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* Renders a progress bar.
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* @param {HTMLElement} el The target element.
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* @class
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*/
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function Progress(el) {
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this.el = el;
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this.loading = 0;
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this.loaded = 0;
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}
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/**
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* Increment the count of loading tiles.
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*/
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Progress.prototype.addLoading = function () {
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if (this.loading === 0) {
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this.show();
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}
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++this.loading;
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this.update();
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};
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/**
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* Increment the count of loaded tiles.
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*/
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Progress.prototype.addLoaded = function () {
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const this_ = this;
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setTimeout(function () {
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++this_.loaded;
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this_.update();
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}, 100);
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};
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/**
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* Update the progress bar.
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*/
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Progress.prototype.update = function () {
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const width = ((this.loaded / this.loading) * 100).toFixed(1) + '%';
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this.el.style.width = width;
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if (this.loading === this.loaded) {
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this.loading = 0;
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this.loaded = 0;
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const this_ = this;
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setTimeout(function () {
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this_.hide();
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}, 500);
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}
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};
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/**
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* Show the progress bar.
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*/
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Progress.prototype.show = function () {
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this.el.style.visibility = 'visible';
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};
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/**
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* Hide the progress bar.
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*/
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Progress.prototype.hide = function () {
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if (this.loading === this.loaded) {
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this.el.style.visibility = 'hidden';
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this.el.style.width = 0;
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}
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};
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const progress = new Progress(document.getElementById('progress'));
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const source = new ImageWMS({
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url: 'https://ahocevar.com/geoserver/wms',
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params: {'LAYERS': 'topp:states'},
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serverType: 'geoserver',
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});
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source.on('imageloadstart', function () {
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progress.addLoading();
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});
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source.on('imageloadend', function () {
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progress.addLoaded();
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});
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source.on('imageloaderror', function () {
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progress.addLoaded();
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});
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const map = new Map({
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layers: [new ImageLayer({source: source})],
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target: 'map',
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view: new View({
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center: [-10997148, 4569099],
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zoom: 4,
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}),
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});
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