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我正在尝试通过 apollo-upload 使用 Quasar 的上传器上传图像。

<q-uploader multiple :url="url" :upload-factory="uploadFactory"/> This is 
how I implement the Uploader.

这是uploadFactory-Function：

uploadFactory (file, updateProgress) {

    return(

        this.$apollo.mutate({
        mutation: gql`
            mutation($file: Upload!) {
            uploadFile(file: $file) {
                filename
                }
            }
        `,
        variables: { file: file }
        })

    )
  return new Promise(resolve, reject);
},

在服务器端我得到了这个：

async uploadFile (parent, { file } ) {
    const { stream, filename, mimetype, encoding } = await file;

    var fs = require('fs');
    const id = 1;
    const uploadDir = __dirname;
    const path = `${uploadDir}/${filename}`
    var wstream = fs.createWriteStream(path);
    wstream.write(stream);
    wstream.end();


    return { stream, filename, mimetype, encoding };
  },
},

到目前为止，代码。如果我输入一个新图像并按下上传按钮，则uploadFactory 在file.__img 中有img-src。如果将数据发送到服务器，则 __img-Object 完全为空：{}。我尝试发送文件，只是文件.__img，尝试复制值，但每次都是空的。

有人实现了这一点吗？或者甚至有可能吗？

仅供参考：一些链接，如果您还没有听说过 quasar 或 apollo： Quasar Uploader， Apollo Upload

4

1 回答 1

1

我做了一个解决方法，但它可以满足我的需求。

客户：

<input-camera v-if="status=='S' && damage != null" ref="inputCamera" @photo="addFile" @popup="openPopup" @removePhoto="removeFile" v-bind:allowMultiple="true" v-bind:labelText="'Photos'" v-bind:id="id"/>

以上是我加载模块的方式。您需要处理包含模块的@photo 和@removePhoto。

这是我写的模块：

<template>
    <q-uploader v-bind:value="value" ref="uploader" inverted color="red-8" :float- 
    label="labelText" :multiple='allowMultiple' :url="url" hide-upload-progress send- 
    raw hide-upload-button class="col-3" @add="addFile" @remove:cancel="removeFile"/>
</template>

<script>
import { format } from 'quasar'

export default {
    name: "input-camera",
    inheritAttrs: false,
    data() {
        return {
            url: '',
            listenerIndex: null,
        }
    },
    props: { value: Boolean, allowMultiple: Boolean, labelText: String, id: String },
    methods: {

    addFile(file)
    {

    var resizedFile = null;
    file = file[0];
    var that = this;

    if(file.type.match(/image.*/)) {
        // Load the image
        var metaData = {};
        var reader = new FileReader();
        reader.onload = function (readerEvent) {
            var image = new Image();
            image.onload = function (imageEvent) {

                // Resize the image
                var canvas = document.createElement('canvas'),
                    max_size = 1024,                             // edit it, or get it from another param!
                    width = image.width,
                    height = image.height;
                if (width > height) {
                    if (width > max_size) {
                        height *= max_size / width;
                        width = max_size;
                    }
                } else {
                    if (height > max_size) {
                        width *= max_size / height;
                        height = max_size;
                    }
                }
                canvas.width = width;
                canvas.height = height;
                canvas.getContext('2d').drawImage(image, 0, 0, width, height);
                var dataUrl = canvas.toDataURL('image/jpeg');
                var type = 'image/jpeg';

                //choose one of the above
                resizedFile = dataUrl;

                var nextId = that.$refs.uploader._data.files.length;
                nextId = nextId - 1;

                //add image metadata
                metaData['lastModified'] = that.$refs.uploader._data.files[nextId].lastModified;
                metaData['name'] = that.$refs.uploader._data.files[nextId].name;
                metaData['size'] = that.$refs.uploader._data.files[nextId].size;
                metaData['type'] = type;

                //back to parent
                that.addNextListener();
                that.$emit('photo', resizedFile, that.id, metaData);

            }
            image.src = readerEvent.target.result;
        }
        reader.readAsDataURL(file);
    }

},
removeFile(file)
{
    var that = this;
    var toFind = file.name;
    var found = false;
    var tempL = null;

    for(let l = 0; l < this.$refs.uploader._data.files.length; l++)
    {
        if(this.$refs.uploader._data.files[l].name == toFind)
        {
            found = true;
            tempL = l;
            break;
        }
    }
    if(found)
    {
        if(tempL != null) that.removeNextListener(tempL);
        this.$emit('removePhoto', toFind, this.id);
    }
},
updateUploaderImages: function(id, index, image){

  // ToDo: below would work, but then we need other way to handle the original image
  // this.$refs.uploader._data.files[index]['__img'].src = image;

},
addNextListener(nextListener)
{

    var that = this;
    if(nextListener == null)
    {
      nextListener = this.$refs.uploader._data.files.length-1;
      const childs = this.$refs.uploader.$el.children[1].children[0].children[nextListener].children[0];
      childs.id = 'image'+nextListener;
      var selector = 'div#image'+nextListener;
      this.listenerIndex = nextListener;

      this.setListener(selector, 'click', that.openPopup, that.$refs.uploader.files[nextListener]);
    }else{
      for(let l = 0; l < nextListener.length; l++)
      {
        var listenerIndex = nextListener[l];
        const childs = this.$refs.uploader.$el.children[1].children[0].children[listenerIndex].children[0];
        childs.id = 'image'+listenerIndex;
        var selector = 'div#image'+listenerIndex;
        this.listenerIndex = listenerIndex;

        this.setListener(selector, 'click', that.openPopup, that.$refs.uploader.files[listenerIndex]);
      }
    }
},
removeNextListener(index)
{
    var that = this;
    var nextListener = index;
    var selector = 'div#image'+nextListener;

    this.removeListener(selector, 'click', that.openPopup, that.$refs.uploader.files[nextListener]);

},
openPopup(img)
{
    var that = this;
    img = img['__img'].src;
    this.$emit('popup', img , that.listenerIndex, that.id);
},
setListener(selector, event, callback, props)
{
    var that = this;
    var listenerElements = document.querySelectorAll(selector);
    if(listenerElements != null)
    {
        for(var le=0; le<listenerElements.length; le++)
        {
            listenerElements[le].addEventListener(event, function(evt) {
                if(callback != null) callback(props);
            });
        }
    }
},
removeListener(selector, event, callback, props)
{
    var that = this;
    var listenerElements = document.querySelectorAll(selector);
    if(listenerElements != null)
    {
        for(var le=0; le<listenerElements.length; le++)
        {
            listenerElements[le].removeEventListener(event, function(evt) {
                if(callback != null) callback(props);
            });
        }
    }
},
setImage(photos, id) {

    var that = this;
    var index = id - 1;
    var listenerIndexes = [];

    for(let l = 0; l < photos.length; l++)
    {

        var length = that.$refs.uploader._data.files.length;
        var img = new Image;
        // img.src = photos[l][id];
        img.src = photos[l][l+1];
        var metadata = photos[l].metaData;

        var imgObject = {};
        imgObject.lastModified = metadata.lastModified;
        var DateTime = new Date(metadata.lastModified);
        imgObject.lastModifiedDate = DateTime;
        imgObject.name = metadata.name;
        imgObject.size = metadata.size;
        imgObject.type = metadata.type;
        imgObject.webkitRelativePath = "";
        imgObject.__doneUploading = false;
        imgObject.__failed = false;
        imgObject.__img = img;
        imgObject.__progress = 0;
        imgObject.__size = (metadata.size / 1024)+" kB";
        imgObject.__timestamp = metadata.lastModified;
        imgObject.__uploaded = false;

        this.$refs.uploader._data.files[length] = imgObject;
        this.$refs.uploader.totalSize = this.$refs.uploader.totalSize + 
        imgObject.size;
        this.$refs.uploader.queue.push(imgObject);
        this.$refs.uploader.expanded = true;

        listenerIndexes.push(length);

    }

      setTimeout(function(){
        that.addNextListener(listenerIndexes);
      },50);

  },
},
computed: {
inputListeners: function () {
  var vm = this
  // `Object.assign` merges objects together to form a new object
  return Object.assign({},
    // We add all the listeners from the parent
    this.$listeners,
    // Then we can add custom listeners or override the
    // behavior of some listeners.
    {
      // This ensures that the component works with v-model
      input: function (event) {
        vm.$emit('input', event);
        //if(!isNaN(event)) vm.$emit('input', event.toString().replace('.',''))
        //else return event.slice(0, -1);
          }
        }
      )
    }
  },
}

</script>

它还包括缩小图像并为图像设置 Clicklisteners，因此您可以在弹出窗口中打开它。如果您从服务器取回图像，您可以通过 datauri 将图像插入回上传器。

然后我只需将 imageData 添加到 json-object 并将其发送到服务器，在那里进行处理。

希望它对您有所帮助。

PS：我禁用了上传按钮，因此每次添加时都会返回 photoData，然后我将其推入数组并开始在 UI 中的另一个按钮上发送数据。

于 2018-10-25T12:21:32.560 回答