I have a component that should to handle the upload file. It holds a bootstrap vue progress component. I would to handle file loading of filereader. This is part of vue.js component:
<b-form-file accept=".jpg, .png, .gif, jpeg" v-model="file" size="sm" @change="fileUpload"></b-form-file>
<b-progress :value="progress" :max="maxvalue" show-progress animated></b-progress>
This is my data:
data () {
return {
...
file:null,
progress:0,
maxvalue:100
}
},
This is my code:
fileUpload(ev){
var files = ev.target.files || ev.dataTransfer.files;
const file=files[0];
var reader = new FileReader();
let _vue=this;
reader.onprogress=function(e){
let progress=Math.round((e.loaded / e.total) * 100);
if(progress<100){_vue.progress=progress;}
};
reader.onload = function(event) {
var dataURL = event.target.result;
let image=new Image();
if(file.size>3000000) {
_vue.form.file=null;
alert('Dimensioni file eccessive');
return;
}
image.onload=function(){
_vue.$refs.card.style.maxWidth='250px';
_vue.$refs.card.style.width=`${this.width}px`;
}
image.src=dataURL;
_vue.form.file=dataURL;
};
reader.readAsDataURL(file);
}
If I set an alert, I get the progress values else no. I noted if I setting two alert sequentially, I see the first alert for every value until the end and then the other one in reverse.
Sorry for my english