Learn the steps to upload multiple images to Firebase realtime database with the help of Vuejs

Question

Learn the steps to upload multiple images to Firebase realtime database with the help of Vuejs

I am currently facing an issue with uploading multiple images to a real-time Firebase database. I have successfully managed to upload one image, but I am unsure how to handle multiple images at once.

This is the code snippet for uploading a single image:

<v-layout row>
          <v-flex xs12 sm6 offset-sm3>
            <!-- Using 'accept' attribute to only allow image files -->
            <v-btn raised @click="onPickFile">Upload image</v-btn>
            <input
              type="file"
              style="display:none"
              ref="fileInput"
              accept="image/*"
              @change="onFilePicked"/></v-flex
        ></v-layout>

In my data object, I have two properties: imgURL: "", image: null. The following method handles the file selection:

onFilePicked(event) {
  const files = event.target.files;
  let filename = files[0].name;
  if (filename.lastIndexOf(".") <= 0) {
    return alert("Please add a valid file!");
  }
  const fileReader = new FileReader();
  fileReader.addEventListener("load", () => {
    this.imgURL = fileReader.result;
  });
  fileReader.readAsDataURL(files[0]);
  this.image = files[0];
},

javascript firebase vue.js firebase-realtime-database

Answer 1

Answer №1

While this question may not be directly related to Firebase, I'll do my best to offer some assistance:

To enable selection of multiple files in an input tag, you should add the multiple attribute:

// BEFORE:
<input type="file" style="display:none" ref="fileInput" accept="image/*" @change="onFilePicked"/>
// AFTER:
<input type="file" style="display:none" ref="fileInput" accept="image/*" @change="onFilePicked" multiple/>

If you encountered an issue with a 'for-loop' for files, try using of instead of in to access the file itself instead of just the index:

I've separated key parts of your function and converted them into asyncronous Promises to prevent timing errors with addEventListener:

This is a basic implementation for uploading multiple files. It might be beneficial to include additional error handling:

new Vue({
  data: {
    blobs: [],
    images: [],
  },
  methods: {
    async onFilePicked(event) {
      const files = event.target.files
      this.images = []
      this.blobs = []
      for (let file of files) {
        this.images.push(file)
        let blob = await this.prepareImagesForUpload(file)
        this.blobs.push(blob)
      }
      this.uploadImagesToFirebase()
    },
    prepareImagesForUpload(file) {
      return new Promise((resolve, reject) => {
        let filename = file.name
        if (filename.lastIndexOf(".") <= 0) {
          alert("Please add a valid file: ", filename)
          reject()
        }
        const fileReader = new FileReader()
        fileReader.readAsDataURL(file)
        fileReader.addEventListener("load", async () => { resolve(fileReader.result) })
      })
    },
    uploadImagesToFirebase() {
      //... Perform firebase upload operations here:
      console.log(this.blobs)
      //...
    }
  }
})

Answer 2

While this question may not be directly related to Firebase, I'll do my best to offer some assistance:

To enable selection of multiple files in an input tag, you should add the multiple attribute:

// BEFORE:
<input type="file" style="display:none" ref="fileInput" accept="image/*" @change="onFilePicked"/>
// AFTER:
<input type="file" style="display:none" ref="fileInput" accept="image/*" @change="onFilePicked" multiple/>

If you encountered an issue with a 'for-loop' for files, try using of instead of in to access the file itself instead of just the index:

I've separated key parts of your function and converted them into asyncronous Promises to prevent timing errors with addEventListener:

This is a basic implementation for uploading multiple files. It might be beneficial to include additional error handling:

new Vue({
  data: {
    blobs: [],
    images: [],
  },
  methods: {
    async onFilePicked(event) {
      const files = event.target.files
      this.images = []
      this.blobs = []
      for (let file of files) {
        this.images.push(file)
        let blob = await this.prepareImagesForUpload(file)
        this.blobs.push(blob)
      }
      this.uploadImagesToFirebase()
    },
    prepareImagesForUpload(file) {
      return new Promise((resolve, reject) => {
        let filename = file.name
        if (filename.lastIndexOf(".") <= 0) {
          alert("Please add a valid file: ", filename)
          reject()
        }
        const fileReader = new FileReader()
        fileReader.readAsDataURL(file)
        fileReader.addEventListener("load", async () => { resolve(fileReader.result) })
      })
    },
    uploadImagesToFirebase() {
      //... Perform firebase upload operations here:
      console.log(this.blobs)
      //...
    }
  }
})

Learn the steps to upload multiple images to Firebase realtime database with the help of Vuejs

Answer №1

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