如何从外部 q-btn 触发隐藏的 Quasar q-file 输入？

Question

我有一个用于选择图像文件的q-file 元素和一个用于显示图像的q-img 元素。

我不喜欢q-file的输入样式，所以我想隐藏它并从外部q-btn触发图片上传。

但我不知道如何从外部q-btn 触发q-file。

const { ref } = Vue
const app = Vue.createApp({
  setup () {
  
    const image = ref(null);
    const imageUrl = ref('');
    
    const handleUpload = () => {
      if (image.value) {
        imageUrl.value = URL.createObjectURL(image.value);
      }
    }
    
    const handleUploadBtnClick = () => {
      // Somehow trigger the hidden q-file selection window
    }
    
    return {
      image, imageUrl, handleUpload
    }
  }
})

app.use(Quasar)
app.mount('#q-app')

<link href="https://fonts.googleapis.com/css?family=Roboto:100,300,400,500,700,900|Material+Icons" rel="stylesheet" type="text/css">
<link href="https://cdn.jsdelivr.net/npm/quasar@2.4.13/dist/quasar.prod.css" rel="stylesheet" type="text/css">
<div id="q-app">
  <div>
    <q-file
      style="display: none"
      v-model="image"
      @update:model-value="handleUpload()"
   ></q-file>
  </div>
  <div>
    <q-btn
      type="button"
      label="Upload Photo"
      @click="handleUploadBtnClick"
   ></q-btn>
  </div>
  <div>
    <q-img
      :src="imageUrl"
      spinner-color="white"
      style="height: 140px; max-width: 150px"
    ></q-img>
  </div>
</div>

<script src="https://cdn.jsdelivr.net/npm/vue@3/dist/vue.global.prod.js"></script>
<script src="https://cdn.jsdelivr.net/npm/quasar@2.4.13/dist/quasar.umd.prod.js"></script>

Answer 1

您可以创建 ref 到 q-file ，然后从 q-btn 使用 file.value.pickFiles() 调用它

const { ref, onMounted } = Vue
const app = Vue.createApp({
  setup () {
  
    const image = ref(null);
    const imageUrl = ref('');
    const file = ref(null)
    
    const handleUpload = () => {
      if (image.value) {
        imageUrl.value = URL.createObjectURL(image.value);
      }
    }
    
    const handleUploadBtnClick = () => {
      file.value.pickFiles()
    }
    
    return {
      image, imageUrl, handleUpload, handleUploadBtnClick, file
    }
  }
})

app.use(Quasar)
app.mount('#q-app')

<link href="https://fonts.googleapis.com/css?family=Roboto:100,300,400,500,700,900|Material+Icons" rel="stylesheet" type="text/css">
<link href="https://cdn.jsdelivr.net/npm/quasar@2.4.13/dist/quasar.prod.css" rel="stylesheet" type="text/css">
<div id="q-app">
  <div>
    <q-file
      style="display: none"
      v-model="image"
      @update:model-value="handleUpload"
      ref="file"
   ></q-file>
  </div>
  <div>
    <q-btn
      type="button"
      label="Upload Photo"
      @click="handleUploadBtnClick"
   ></q-btn>
  </div>
  <div>
    <q-img
      :src="imageUrl"
      spinner-color="white"
      style="height: 140px; max-width: 150px"
    ></q-img>
  </div>
</div>

<script src="https://cdn.jsdelivr.net/npm/vue@3/dist/vue.global.prod.js"></script>
<script src="https://cdn.jsdelivr.net/npm/quasar@2.4.13/dist/quasar.umd.prod.js"></script>

Answer 2

嗨 @TinyTiger 我正在使用 Script Setup 和 TypeScript 搜索相同的内容，并在 Yusuf Kandemir 的帮助下结束了它的实现。

<template>
  <q-card>
    <q-avatar
      color="red"
      v-on:click="selectFile()"
    >
      <q-img
        v-bind:src="img"
        v-bind:fit="'contain'"
        v-bind:ratio="1"
      />
    </q-avatar>

    <q-file
      ref="fileRef"
      v-model="fileModel"
      style="display: none"
      v-bind:max-files="1"
      accept="image/*"
      v-on:update:model-value="fileOnUpdate"
    />
  </q-card>
</template>

<script setup lang="ts">
import { Ref, ref, onUnmounted } from 'vue'
import { QFile } from 'quasar'

const fileModel = ref<File>()
const fileRef = ref() as Ref<QFile>
const img = ref<string>()

function selectFile() {
  fileRef.value.pickFiles()
}

function fileOnUpdate(selectedFile: File) {
  if (img.value) {
    URL.revokeObjectURL(img.value)
  }
  img.value = URL.createObjectURL(selectedFile)
}

onUnmounted(() => {
  if (img.value) {
    URL.revokeObjectURL(img.value)
  }
})
</script>