Laravel 5.2 ajax上传进度条和VerifyCsrfToken.php第67行中的TokenMismatch

Question

我正在尝试集成图像上传进度条。当我用PHP提交表单时，我的代码运行良好，但当我在进度条中包含javascript时，我会收到错误"VerifyCsrfToken.PHP第67行中的TokenMismatchException"。这是我的表格：

{!! Form::open(array('files' => true, 'class' => 'form', 'route' => ['backend.posts.uploadimage', $post->id])) !!}
    <div class="form-group">
        {!! Form::file('image', ['id' => 'image']) !!}
    </div>
    <hr>
    <input type="button" value="Upload Image" class="btn btn-info btn-sm" onclick="uploadImage()">
{!! Form::close() !!}

此表单生成带有令牌的隐藏输入字段：

<input name="_token" type="hidden" value="jGQWC2GljiSeZrL8wvfMaH490xHOh727345U6HzK">

我的javascript代码是：

function uploadImage()
    {
        var file = document.getElementById("image").files[0];
        var id = {{ $post->id }};
        var formdata = new FormData();
        formdata.append("image", file);
        var ajax = new XMLHttpRequest();
        ajax.upload.addEventListener("progress", progressHandler, false);
        ajax.addEventListener("load", completeHandler, false);
        ajax.addEventListener("error", errorHandler, false);
        ajax.addEventListener("abort", abortHandler, false);
        ajax.open("post", "{{ route('backend.posts.uploadimage', $post->id) }}");
        ajax.send(formdata);
    }
    function progressHandler(event)
    {
        var percent = (event.loaded / event.total) * 100;
        document.getElementById("progressPercent").style.width = Math.round(percent);
    }
    function completeHandler(event)
    {
        document.getElementById("status").innerHTML = event.target.responseText;
        document.getElementById("progressPercent").style.width = 0;
    }
    function errorHandler(event)
    {
        document.getElementById("status").innerHTML = "Upload Failed";
    }
    function abortHandler(event)
    {
        document.getElementById("status").innerHTML = "Upload Aborted";
    }

在我的PostController中上传图像的方法是：

public function uploadImage(RequestsUploadImageRequest $request, $id)
    {
        $post = $this->posts->findOrFail($id);
        $image = $request->file('image');
        $imageName = $image->getPathName();
        $newImageName = $post->id . '-' . md5(microtime());
        $imageExtension = $image->getClientOriginalExtension();
        $imageFile = $newImageName . '.' . $imageExtension;
        $path = public_path();
        move_uploaded_file($imageName, $path . '/images/img_upload/' . $imageFile);
        $post->where('id', $id)->update(['image_name' => $newImageName, 'ext' => $imageExtension]);
        return view('backend.posts.uploadimage');
    }

我如何使用纯javascript从隐藏字段发布令牌，或者有其他解决方案来解决这个问题？请帮忙。

Answer 1

使用getElementsByName()获取输入字段的值。

var _token = document.getElementsByName('_token')[0].value;
//and append the value to form data
formdata.append("_token", _token);