Guide to uploading files in Vue.js v3

Question

Guide to uploading files in Vue.js v3

I'm trying to implement file upload functionality using Vue.js version 3.

Although I have successfully imported ref, I am unsure how to utilize it for retrieving file data?

FileUploadTest.vue

<template>
<h1>File Upload</h1>
<div class="container">
    <div>
      <label>File
        <input type="file" id="file" ref="file" v-on:change="onChangeFileUpload()"/>
      </label>
        <button v-on:click="submitForm()">Upload</button>
    </div>
  </div>
</template>

<script src="./FileUploadTest.ts" lang="ts"></script>

FileUploadTest.ts

import { Options, Vue } from "vue-class-component";
import { ref } from 'vue';
import axios from "../../axios/index";

@Options({})
export default class FileUploadTest extends Vue {

    protected file: any;

    submitForm() {
        const formData = new FormData();
        formData.append('bytes', this.file);

        axios.post('https://localhost:44313/api/app/file/save',
            formData,
            {
                headers: {
                    'Content-Type': 'multipart/form-data'
                }
            }
        ).then(function (data) {
            console.log(data.data);
        })
        .catch(function () {
            console.log('FAILURE!!');
        });
    }

    onChangeFileUpload() {
        debugger;
        this.file = ref(["file"]).value; 
    }
};

The issue I am facing is that the actual file content is not being stored in the this.file variable

this.file = ref(["file"]).value;

typescript vue.js vuejs3

Answer 1

Answer №1

Here is a brief overview of the answer:

FileUpload.vue

<template>
  <div>
    <input
      type="file"
      @change="onFileChanged($event)"
      accept="image/*"
      capture
    />
  </div>
</template>

FileUpload.ts

import { defineComponent, ref } from "vue";

export default defineComponent({

    name: "FileUpload",

    setup() {
        const file = ref<File | null>();
        const form = ref<HTMLFormElement>();

        function onFileChanged($event: Event) {
            const target = $event.target as HTMLInputElement;
            if (target && target.files) {
                file.value = target.files[0];
            }
        }

        async function saveImage() {
            if (file.value) {
                try {
                // save file.value
                } catch (error) {
                    console.error(error);
                    form.value?.reset();
                    file.value = null;
                } finally {
                }
            }
        };

        return {
            saveImage,
            onFileChanged,
        }
    }
});

Answer 2

Here is a brief overview of the answer:

FileUpload.vue

<template>
  <div>
    <input
      type="file"
      @change="onFileChanged($event)"
      accept="image/*"
      capture
    />
  </div>
</template>

FileUpload.ts

import { defineComponent, ref } from "vue";

export default defineComponent({

    name: "FileUpload",

    setup() {
        const file = ref<File | null>();
        const form = ref<HTMLFormElement>();

        function onFileChanged($event: Event) {
            const target = $event.target as HTMLInputElement;
            if (target && target.files) {
                file.value = target.files[0];
            }
        }

        async function saveImage() {
            if (file.value) {
                try {
                // save file.value
                } catch (error) {
                    console.error(error);
                    form.value?.reset();
                    file.value = null;
                } finally {
                }
            }
        };

        return {
            saveImage,
            onFileChanged,
        }
    }
});

Answer 3

Answer №2

Utilizing the composition API in Vue3.js to upload files to a server

<template>
      <input ref="file" v-on:change="handleFileUpload()"  type="file">
</template>
<script>

import { ref } from "vue"

export default {
    name:'Add',

    setup() {
        const file = ref(null)

        const handleFileUpload = async() => {
           // debugger;
            console.log("selected file",file.value.files)
            //Upload to server
        }

        return {
          handleFileUpload,
          file
       }
    }
}

</script>

Answer 4

Utilizing the composition API in Vue3.js to upload files to a server

<template>
      <input ref="file" v-on:change="handleFileUpload()"  type="file">
</template>
<script>

import { ref } from "vue"

export default {
    name:'Add',

    setup() {
        const file = ref(null)

        const handleFileUpload = async() => {
           // debugger;
            console.log("selected file",file.value.files)
            //Upload to server
        }

        return {
          handleFileUpload,
          file
       }
    }
}

</script>

Answer 5

Answer №3

Here is a straightforward example of a component that can be used for file uploads using the options API without requiring a ref.

fileUpload.vue

<template>
    <input type="file" @change="onChange($event)">
</template>

<script>
export default {
    props: ['modelValue'],
    methods: {
        onChange(event) {
            this.$emit('update:modelValue', event.target.files[0]);
        },
    },
};
</script>
<p>Your component...</p>
<pre class="lang-vue"><code><template>
    <form novalidate @submit.prevent="onSubmit">
        <file-upload v-model="form.file"></file-upload>
    </form>
</template>

<script>
import fileUpload from 'fileUpload';
export default {
    components: { fileUpload },
    data: () => ({ form: { file: null } }),
    methods: {
        onSubmit() {
            console.log(this.form);
            // post the form to the server
        }
    }
}
</script>

Answer 6

Here is a straightforward example of a component that can be used for file uploads using the options API without requiring a ref.

fileUpload.vue

<template>
    <input type="file" @change="onChange($event)">
</template>

<script>
export default {
    props: ['modelValue'],
    methods: {
        onChange(event) {
            this.$emit('update:modelValue', event.target.files[0]);
        },
    },
};
</script>
<p>Your component...</p>
<pre class="lang-vue"><code><template>
    <form novalidate @submit.prevent="onSubmit">
        <file-upload v-model="form.file"></file-upload>
    </form>
</template>

<script>
import fileUpload from 'fileUpload';
export default {
    components: { fileUpload },
    data: () => ({ form: { file: null } }),
    methods: {
        onSubmit() {
            console.log(this.form);
            // post the form to the server
        }
    }
}
</script>

Answer 7

Answer №4

Exploring Vuejs 3 with TypeScript in 2023

In my latest project, I have embraced the

<script setup lang="ts">

feature to leverage the composition API in Vuejs 3. By using lang="ts", I am indicating that I am working with TypeScript instead of JavaScript.

<template>
    <main>
        <input ref="fileInput" type="file" @change="handleFileChange" />
        <button @click="doSomething">do something</button>
    </main>
</template>

<script setup lang="ts">
import { ref } from 'vue'

const fileInput = ref<HTMLInputElement | null>(null)
const files = ref()

function handleFileChange() {
    files.value = fileInput.value?.files
}

function doSomething() {
    const file = files.value[0]
    console.log(file)
    // and do other things...
}
</script>

What's Going On Behind the Scenes?

The ref attribute is a powerful tool that allows us to access references to DOM elements or components.

To make use of the ref within the template, we declare it in the script section with the same name like so:

const fileInput = ref<HTMLInputElement | null>(null);

The files variable serves as a container for multiple files. To retrieve the first or only file, you can access it by calling const file = files.value[0]. This retrieves the initial file object within files, giving you the flexibility to manipulate the file as needed.

If you wish to extract the filename:

file.name

Or the file extension:

file.name.split('.').pop();

Or just the filename without the extension:

file.name.substring(0, file.name.lastIndexOf('.'))

Answer 8

Exploring Vuejs 3 with TypeScript in 2023

In my latest project, I have embraced the

<script setup lang="ts">

feature to leverage the composition API in Vuejs 3. By using lang="ts", I am indicating that I am working with TypeScript instead of JavaScript.

<template>
    <main>
        <input ref="fileInput" type="file" @change="handleFileChange" />
        <button @click="doSomething">do something</button>
    </main>
</template>

<script setup lang="ts">
import { ref } from 'vue'

const fileInput = ref<HTMLInputElement | null>(null)
const files = ref()

function handleFileChange() {
    files.value = fileInput.value?.files
}

function doSomething() {
    const file = files.value[0]
    console.log(file)
    // and do other things...
}
</script>

What's Going On Behind the Scenes?

The ref attribute is a powerful tool that allows us to access references to DOM elements or components.

To make use of the ref within the template, we declare it in the script section with the same name like so:

const fileInput = ref<HTMLInputElement | null>(null);

The files variable serves as a container for multiple files. To retrieve the first or only file, you can access it by calling const file = files.value[0]. This retrieves the initial file object within files, giving you the flexibility to manipulate the file as needed.

If you wish to extract the filename:

file.name

Or the file extension:

file.name.split('.').pop();

Or just the filename without the extension:

file.name.substring(0, file.name.lastIndexOf('.'))

Answer 9

Answer №5

If you are utilizing the option API, there is no requirement for the ref attribute; simply access the file using this.$refs.file like so:

   handleFileSelection() {
        debugger;
        this.selectedFile = this.$refs.file[0]; 
    }

Answer 10

If you are utilizing the option API, there is no requirement for the ref attribute; simply access the file using this.$refs.file like so:

   handleFileSelection() {
        debugger;
        this.selectedFile = this.$refs.file[0]; 
    }

Answer 11

Answer №6

Even though it primarily functions as a frontend library, I still rely on the core JavaScript function to take control. By utilizing the onchange listener and its parameter that stores the entire element, I can easily access the file value once it's clicked.

<template>
  <form novalidate @submit.prevent="onSubmit">
    <input type="file" @change="addFile" />
  </form>
</template>

<script>
export default {
  name: "MyForm",

  data() {
    return {
      file: null,
    };
  },
  methods: {
    addFile(e) {
      this.file = e.target.files[0];
    },
    onSubmit() {
      console.log(this.file);
      // send the form data to the server
    },
  },
};
</script>


This method allows for customization or background uploading while you continue completing other sections of the form.

Answer 12

Even though it primarily functions as a frontend library, I still rely on the core JavaScript function to take control. By utilizing the onchange listener and its parameter that stores the entire element, I can easily access the file value once it's clicked.

<template>
  <form novalidate @submit.prevent="onSubmit">
    <input type="file" @change="addFile" />
  </form>
</template>

<script>
export default {
  name: "MyForm",

  data() {
    return {
      file: null,
    };
  },
  methods: {
    addFile(e) {
      this.file = e.target.files[0];
    },
    onSubmit() {
      console.log(this.file);
      // send the form data to the server
    },
  },
};
</script>


This method allows for customization or background uploading while you continue completing other sections of the form.

Answer 13

Answer №7

Ensure that there is no v-model attached to your file input element.

Answer 14

Ensure that there is no v-model attached to your file input element.

Answer 15

Answer №8

As an illustration You have the option to utilize v-file-input

<v-card-text>
    <v-container>
        <v-row>
            <v-col cols="12" sm="12" md="12">
                <v-file-input v-model="file" show-size label="Template input"></v-file-input>
            </v-col>
        </v-row>
   </v-container>
</v-card-text>

https://i.sstatic.net/d24D1.png

Answer 16

As an illustration You have the option to utilize v-file-input

<v-card-text>
    <v-container>
        <v-row>
            <v-col cols="12" sm="12" md="12">
                <v-file-input v-model="file" show-size label="Template input"></v-file-input>
            </v-col>
        </v-row>
   </v-container>
</v-card-text>

https://i.sstatic.net/d24D1.png

Guide to uploading files in Vue.js v3

Answer №1

Answer №2

Answer №3

Answer №4

Exploring Vuejs 3 with TypeScript in 2023

What's Going On Behind the Scenes?

Answer №5

Answer №6

Answer №7

Answer №8

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