Files
openlayers/examples/image-load-events.js
2022-03-19 10:50:04 +01:00

89 lines
1.7 KiB
JavaScript

import ImageLayer from '../src/ol/layer/Image.js';
import ImageWMS from '../src/ol/source/ImageWMS.js';
import Map from '../src/ol/Map.js';
import View from '../src/ol/View.js';
/**
* Renders a progress bar.
* @param {HTMLElement} el The target element.
* @class
*/
function Progress(el) {
this.el = el;
this.loading = 0;
this.loaded = 0;
}
/**
* Increment the count of loading tiles.
*/
Progress.prototype.addLoading = function () {
++this.loading;
this.update();
};
/**
* Increment the count of loaded tiles.
*/
Progress.prototype.addLoaded = function () {
++this.loaded;
this.update();
};
/**
* Update the progress bar.
*/
Progress.prototype.update = function () {
const width = ((this.loaded / this.loading) * 100).toFixed(1) + '%';
this.el.style.width = width;
};
/**
* Show the progress bar.
*/
Progress.prototype.show = function () {
this.el.style.visibility = 'visible';
};
/**
* Hide the progress bar.
*/
Progress.prototype.hide = function () {
const style = this.el.style;
setTimeout(function () {
style.visibility = 'hidden';
style.width = 0;
}, 250);
};
const progress = new Progress(document.getElementById('progress'));
const source = new ImageWMS({
url: 'https://ahocevar.com/geoserver/wms',
params: {'LAYERS': 'topp:states'},
serverType: 'geoserver',
});
source.on('imageloadstart', function () {
progress.addLoading();
});
source.on(['imageloadend', 'imageloaderror'], function () {
progress.addLoaded();
});
const map = new Map({
layers: [new ImageLayer({source: source})],
target: 'map',
view: new View({
center: [-10997148, 4569099],
zoom: 4,
}),
});
map.on('loadstart', function () {
progress.show();
});
map.on('loadend', function () {
progress.hide();
});