Question

我正在尝试创建一个允许用户上传图像并使用React和Firebase在页面中显示图像的应用程序。

这是导致问题的代码部分：图片变量来自状态

const [image, setImage] = useState("");
const [caption, setCaption] = useState("");
const [progress, setProgress] = useState(0)

function handleChange (e){
    if  (e.target.files[0]){
        setImage(e.target.files[0]);
    }
}
function handleUpload(){
    const uploadTask =  storage.ref('images/${image.name}').put(image)
    uploadTask.on(
        "state_changed",
        (snapshot) => {
            const progress = Math.round(
            (snapshot.bytesTransferred / snapshot.totalBytes) *  100
             );
            setProgress(progress);

           },
           (error) => {
            console.log(error);
            alert(error.message);
            },
            () => {
                storage
                .ref("images")
                .child(image.name)
                .getDownloadURL()
                .then(url => {
                    db.collection("posts").add({
                        timestamp: db.FieldValue.serverTimestamp(),
                        caption : caption,
                        imgUrl: url,
                        userName: username
                    })
                            setProgress(0);
                            setCaption("");
                            setImage(null);
                })
            }

        )
  
}

，此错误将记录在控制台中：

Uncaught 

FirebaseStorageError {code_: "storage/invalid-argument", message_: "Firebase Storage: Invalid argument in `put` at index 0: Expected Blob or File.", serverResponse_: null, name_: "FirebaseError"}code_: "storage/invalid-argument"message_: "Firebase Storage: Invalid argument in `put` at index 0: Expected Blob or File."name_: "FirebaseError"serverResponse_: nullcode: (...)message: (...)name: (...)serverResponse: (...)__proto__: Object
    rethrowCaughtError @ react-dom.development.js:328
    runEventsInBatch @ react-dom.development.js:3336
    runExtractedPluginEventsInBatch @ react-dom.development.js:3537
    handleTopLevel @ react-dom.development.js:3581
    batchedEventUpdates$1 @ react-dom.development.js:21729
    batchedEventUpdates @ react-dom.development.js:798
    dispatchEventForLegacyPluginEventSystem @ react-dom.development.js:3591
    attemptToDispatchEvent @ react-dom.development.js:4311
    dispatchEvent @ react-dom.development.js:4232
    unstable_runWithPriority @ scheduler.development.js:659
    runWithPriority$1 @ react-dom.development.js:11077
    discreteUpdates$1 @ react-dom.development.js:21746
    discreteUpdates @ react-dom.development.js:811
    dispatchDiscreteEvent @ react-dom.development.js:4211

我尝试将put(image)更改为put(blob)，但没有用

Answer 1

该行：

const uploadTask =  storage.ref('images/${image.name}').put(image)

有错误，应该使用符号`（反引号/反引号）而不是单引号'：

const uploadTask =  storage.ref(`images/${image.name}`).put(image)

否则，您将创建对文字字符串images/${image.name}的引用，而不是image/value_of_variable_image.jpg创建更多有关模板文字的引用here

您还没有向我们展示image变量的内容，我从代码中可以看到，您正在一个似乎是回调的函数中调用setState，但是我看不到您从哪里打来，您可以通过这样的输入来做到这一点：

<input type="file" onChange={handleChange} />

如果您已经这样使用它，建议将console.log(image)添加到函数外部，以便在将变量发送到put()之前调试变量的内容。就像参考一样，console.log(image)的输出应该是File javascript API

的实例

尝试将图像上传到Firebase存储时出错

1 个答案: