Select delayed features

by Vladimir Vershinin

HTML

<script src="https://unpkg.com/[email protected]/lodash.js"></script>
<script src="https://unpkg.com/vue@latest/dist/vue.min.js"></script>
<script src="https://cdn.jsdelivr.net/gh/openlayers/openlayers.github.io/en/v5.3.0/build/ol.js"></script>
<script src="https://unpkg.com/[email protected]/lib/index.umd.js"></script>
<link rel="stylesheet" href="https://unpkg.com/[email protected]/lib/style.css">
<div id="app">
  <vl-map ref="map" data-projection="EPSG:4326">
    <aside style="position: absolute; right: 0.75rem; top: 0.75rem; width: 320px; background-color: white; box-shadow: 1px 1px 2px rgba(0, 0, 0, 0.5); z-index: 1; padding: 0.75rem; border-radius: 0.25rem;">
      <form style="overflow: hidden;">
        <button @click.prevent="mode = 'draw'" :disabled="mode == 'draw'" style="width: 100%">Draw a point</button>
        <ul v-if="selectedFeatures.length > 0">
          <li v-for="feature in selectedFeatures" :key="feature.id">
            {{ feature.id }}
          </li>
        </ul>
      </form>
    </aside>
    <vl-view ref="view" :zoom.sync="zoom" :center.sync="center"></vl-view>
    <vl-layer-tile>
      <vl-source-osm />
    </vl-layer-tile>
    <vl-layer-vector>
      <vl-source-vector ident="draw-target" :features.sync="features" />
    </vl-layer-vector>
    <vl-interaction-select ref="interaction" v-if="mode === 'select'" :features.sync="selectedFeatures" @select="onSelect">
      <template slot-scope="select">
        <vl-style-box :z-index="1">
          <vl-style-stroke color="#423e9e" :width="7"></vl-style-stroke>
          <vl-style-fill :color="[254, 178, 76, 0.7]"></vl-style-fill>
          <vl-style-circle :radius="5">
            <vl-style-stroke color="#423e9e" :width="7"></vl-style-stroke>
            <vl-style-fill :color="[254, 178, 76, 0.7]"></vl-style-fill>
          </vl-style-circle>
        </vl-style-box>
        <vl-style-box :z-index="1">
          <vl-style-stroke color="#d43f45" :width="2"></vl-style-stroke>
         ...

CSS

html,
body,
#app {
  width: 100%;
  height: 100%;
  margin: 0;
  padding: 0;
}

#app {
  display: flex;
  flex-direction: column;
}

.vl-map {
  overflow: hidden;
}

JavaScript

new Vue({
  el: '#app',
  data() {
    return {
      zoom: 2,
      center: [0, 0],
      mode: 'draw',
      features: [],
      selectedFeatures: [],
      drawType: 'point'
    }
  },
  computed: {
    layerFeatureIds() {
      return this.features.map(f => f.id)
    },
    featuresState() {
      if (this.features.length) {
        return 'Loaded: ' + this.layerFeatureIds.length
      }

      return 'Loading....'
    },
  },
  mounted() {
    this.loadFeatures().then(features => console.log('loaded', features))
  },
  methods: {
    onDrawEnd(event) {
      this.mode = 'select'
			console.log(this.features.find(f => f.id === event.feature.getId()))
      this.$nextTick(() => {
        this.$refs.interaction.select(event.feature)
      })
    },
    onSelect(event) {
      console.log(event)
    },
    selectCondition: ol.events.condition.click,
    loadFeatures() {
      return new Promise(resolve => {
        setTimeout(() => {
          this.features = _.range(0, 100).map(i => ({
            type: 'Feature',
            id: 'point-' + (i + 1),
            properties: {},
            geometry: {
              type: 'Point',
              coordinates: [
                _.random(-50, 50),
                _.random(-50, 50),
              ],
            },
          }))

          resolve(this.features)
        }, 3000)
      })
    },
  }
})