CODEWITHSUNDEEP
vue.jsfilereaderexceljssheetjs
Kay Singian
Kay Singian

Reputation: 1381

VueJS FileReader

I'm trying to use ExcelJS in Vue and I need FileReader to read and parse the files but I'm getting errors. How do I use FileReader with VueJS?

Input Form

    <input type="file" 
        id="importProductionSchedule" 
        name="importProductionSchedule" 
        @change="checkFile($event)" 
        ref="importProductionSchedule"
    >

checkFile method

    checkFile() {
        let reader = new FileReader()
        let self = this

        reader.onload = (e) => {
            let bstr = e.target.result
            let wb = XLSX.read(bstr, {type:'binary'})
            let wsname = wb.SheetNames[0]
            let ws = wb.Sheets[wsname]
            let data = XLSX.utils.sheet_to_json(ws, {header:1})
            self.form.filedata = data
            self.cols = make_cols(ws['!ref'])
        }
        reader.onerror = (stuff) => {
            console.log("error", stuff)
            console.log (stuff.getMessage())
        }
        // reader.readAsArrayBuffer(event)
        reader.readAsBinaryString(event.target.files[0])
    },

First of all, logging event.target.files[0] in the console would return the file, but I'm testing both event and event.target.files[0] to make sure.

These are my errors:

    event = Uncaught Error: cannot read as File: {"isTrusted":true}
    event.target.files[0] = Uncaught Error: cannot read as File: {}

Upvotes: 1

Views: 21533

Answers (3)

Ashok Parmar
Ashok Parmar

Reputation: 408

<input class="patientPorting"
type="file"
@change="onFilePicked( $event )"/>

Create below method to get the file.

const onFilePicked = (event) =>{

        const fData = event.target.files[0];
        const reader = new FileReader();
        reader.readAsDataURL(fData);
        reader.onload = (event) => {
            fileData = event.target.result;
        };
        console.log(fileData);
        jsonObj = [];
        jsonObj.push({
            "fileData" : fileData,
            "fileName":fData.name,
            "fileSize":fData.size,
            "fileType":fData.type,
        }
       );
    }

Upvotes: 0

Ikram Ullah
Ikram Ullah

Reputation: 1

    methods:{
        uploadImage(event) {
        const image = event.target.files[0];
        const reader = new FileReader();
        reader.readAsDataURL(image);
        reader.onload = (event) => {
        this.previewImage = event.target.result;
       };
     }, 
 }

Upvotes: 0

Unknown
Unknown

Reputation: 436

you can use below method

createImage(file) {
    let reader = new FileReader()
    reader.onload = (event) => {
        this.product.image = event.target.result
    }
    reader.readAsDataURL(file)
}

Upvotes: 2

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