Mobile Development with Ionic and Vue — Loading Indicators

If we know how to create Vue web apps but want to develop mobile apps, we can use the Ionic framework.

In this article, we’ll look at how to get started with mobile development with the Ionic framework with Vue.

Loading Indicator

We can add a loading indicator with Ionic Vue with the ion-loading component.

For example, we can write:

<template>
  <ion-button @click="presentLoading">Show Loading</ion-button>
</template>

<script>
import { IonButton, loadingController } from '@ionic/vue';
import { defineComponent } from 'vue';

export default defineComponent({
  props: {
    timeout: { type: Number, default: 1000 },
  },
  methods: {
    async presentLoading() {
      const loading = await loadingController
        .create({
          cssClass: 'my-custom-class',
          message: 'Please wait...',
          duration: this.timeout,
        });

        await loading.present();

        setTimeout(function() {
        loading.dismiss()
      }, this.timeout);
    }
  },
  components: { IonButton }
});
</script>

to use it.

The loadingController.create method creates the loading indicator.

The object has the cssClass property to set the CSS class.

message has the loading indicator message.

duration has the duration to show the loading indicator.

loading.present shows the loading indicator.

loading.dismiss closes the loading indicator.

Also, we can make the loading indicator dismissible:

<template>
  <ion-button @click="presentLoading">Show Loading</ion-button>
</template>

<script>
import { IonButton, loadingController } from "@ionic/vue";
import { defineComponent } from "vue";

export default defineComponent({
  props: {
    timeout: { type: Number, default: 1000 },
  },
  methods: {
    async presentLoading() {
      const loading = await loadingController.create({
        spinner: null,
        duration: this.timeout,
        message: "Click the backdrop to dismiss early...",
        translucent: true,
        cssClass: "custom-class custom-loading",
        backdropDismiss: true,
      });
      await loading.present();

      setTimeout(function () {
        loading.dismiss();
      }, this.timeout);
    },
  },
  components: { IonButton },
});
</script>

The spinner sets to null removes the spinner.

translucent makes the loading indicator container translucent.

backdropDismiss sets to true lets us dismiss the backdrop.

Progress Bar

We can add the progress bar with the ion-progress component.

For instance, we can use it by writing:

<template>
  <ion-progress-bar color="primary" value="0.5"></ion-progress-bar>
  <ion-progress-bar type="indeterminate" reversed="true"></ion-progress-bar>
</template>

<script>
import { IonProgressBar } from '@ionic/vue';
import { defineComponent } from 'vue';

export default defineComponent({
  components: { IonProgressBar }
});
</script>

We set the color with the color prop.

value has the progress value between 0 and 1.

type has the type of progress bar.

reversed changes the bar movement direction from right to left.

Skeleton Text

We can add the skeleton text loading indicator.

For example, we can write:

<template>
  <div>
    <ion-item>
      <ion-skeleton-text
        animated
        style="width: 27px; height: 27px"
        slot="start"
      ></ion-skeleton-text>
      <ion-label>
        <h3>
          <ion-skeleton-text animated style="width: 50%"></ion-skeleton-text>
        </h3>
        <p>
          <ion-skeleton-text animated style="width: 80%"></ion-skeleton-text>
        </p>
        <p>
          <ion-skeleton-text animated style="width: 60%"></ion-skeleton-text>
        </p>
      </ion-label>
    </ion-item>
  </div>
</template>

<script>
import {
  IonAvatar,
  IonIcon,
  IonItem,
  IonLabel,
  IonList,
  IonListheader,
  IonSkeletonText,
  IonThumbnail,
} from "@ionic/vue";
import { call } from "ionicons/icons";
import { defineComponent } from "vue";

export default defineComponent({
  components: {
    IonAvatar,
    IonIcon,
    IonItem,
    IonLabel,
    IonList,
    IonListheader,
    IonSkeletonText,
    IonThumbnail,
  },
});
</script>

The ion-skeleton-text to add the bars for the skeleton text display.

animated makes the bars animated.

The width style sets the width of the bar.

Conclusion

We can add various loading indicators with Ionic Vue.