I have two component

My first component (parent component) like this :

<template>
    <div>
        ...
            <form-input id="name" name="name" v-model="name">Name</form-input>
            <form-input id="birth-date" name="birth_date" type="date" v-model="birthDate">Date of Birth</form-input>
            <form-input id="avatar" name="avatar" type="file" v-on:triggerChange="onFileChange($event)">Avatar</form-input>
            <form-input id="mobile-number" name="mobile_number" type="number" v-model="mobileNumber">Mobile Number</form-input>
        ...
    </div>
</template>
<script>
    export default {
        data() {
            return {
                name: null,
                birthDate:  null,
                mobileNumber: null
            }
        },
        methods: {
            onFileChange(e) {
                let self = this
                this.validate(e.target.files[0])
                .then(function(res) {
                    let files = e.target.files,
                    reader = new FileReader()
                    // if any values
                    if (files.length) {
                        self.removeErrorMessageUpload()
                        self.files = files[0]
                        reader.onload = (e) => {
                            self.updateProfileAvatar(e.target.result)
                        }
                        reader.readAsDataURL(files[0])
                    }
                })
                .catch(function() {
                    // do something in the case where the image is not valid
                    self.displayErrorMessageUpload()
                })
            },
            validate(image) {
                let self = this
                return new Promise(function(resolve, reject) {
                    // validation file type
                    if (!self.allowableTypes.includes(image.name.split(".").pop().toLowerCase())) {
                        reject()
                    }
                    // validation file size
                    if (image.size > self.maximumSize) {
                        reject()
                    }
                    // validation image resolution
                    let img = new Image()
                    img.src = window.URL.createObjectURL(image)
                    img.onload = function() {
                        let width = img.naturalWidth,
                            height = img.naturalHeight

                        window.URL.revokeObjectURL(img.src)

                        if (width != 100 && height != 100) {
                            reject()
                        } 
                        else {
                            resolve()
                        }
                    }
                })         
            },
        }
    }
</script>

From the parent component, it will call child component (form input component)

My child component are input type text, input type date, input type file and input type number. I combine all of them into 1 component

The child component like this :

<template>
    <div class="form-group">
        <label :for="id" class="col-sm-3 control-label"><slot></slot></label>
        <div class="col-sm-9">
            <input :type="type" :name="name" :id="id" class="form-control" :value="value" v-on:change="applySelected($event)" @input="$emit('input', $event.target.value)">
        </div>
    </div>
</template>

<script>
    export default {
        name: "form-input",
        props: {
            'id': String,
            'name': String,
            'isRequired': {
                type: Boolean,
                default: true
            },
            'type': {
                type: String,
                default() {
                    if(this.type == 'number')
                        return 'number'
                    return 'text'
                }
            },
            'value': {
                type: [String, Number]
            }
        },
        methods: {
            applySelected(e) {
                this.$emit('triggerChange', e)
            }
        }
    }
</script>

Because I merge into 1 komponent, I get a new problem

If I input the input type file, the value of file will show in the input type file

But if I input in the input type text, the value of input type file missing

Why the value of input type file missing?

Demo:

Vue.component('form-input', {
  template: "#form-input-tpl",
  name: "form-input",
  props: {
    'id': String,
    'name': String,
    'isRequired': {type: Boolean, default: true},
    'type': { type: String, default () {if (this.type == 'number') {return 'number'} else {return 'text'}}},
    'value': { type: [String, Number] }
  },
  methods: {
    applySelected(e) { this.$emit('triggerChange', e) }
  }
});

new Vue({
  el: '#app',
  data: {
    name: null,
    birthDate: null,
    mobileNumber: null
  },
  methods: {
    onFileChange(e) {
      // ...
    }
  }
})

<script src="https://unpkg.com/vue"></script>

<template id="form-input-tpl">
    <div class="form-group">
        <label :for="id" class="col-sm-3 control-label"><slot></slot></label>
        <div class="col-sm-9">
            <input :type="type" :name="name" :id="id" class="form-control" :value="value" v-on:change="applySelected($event)" @input="$emit('input', $event.target.value)">
        </div>
    </div>
</template>

<div id="app">
  <h3>Select a file, then type a name. The file will be reset.</h3>
  <div>
    <form-input id="name" name="name" v-model="name">Name</form-input>
    <form-input id="birth-date" name="birth_date" type="date" v-model="birthDate">Date of Birth</form-input>
    <form-input id="avatar" name="avatar" type="file" v-on:triggerChange="onFileChange($event)">Avatar</form-input>
    <form-input id="mobile-number" name="mobile_number" type="number" v-model="mobileNumber">Mobile Number</form-input>
  </div>
</div>