用于MVC文件上载的Bootstrap进度条

Question

是否有一种简单的方法可以在加载文件时显示阻止的Bootstrap进度条？

当文件上传时，进度会显示在chrome的状态栏中：

我希望对话框看起来像this

我的行动看起来像这样：

 [HttpPost]
        public ActionResult Upload(UploadViewModel model)
        {
                using (MemoryStream uploadedFile = new MemoryStream())
                {
                    model.File.InputStream.CopyTo(uploadedFile);                            
                    uploadService.UploadFile(uploadedFile, model.File.ContentType)
                    return View();
                 }
         }

型号：

  public class UploadViewModel
    {
        [Required]
        public HttpPostedFileBase File { get; set; }
    }

查看：

@model Bleh.Web.Models.UploadViewModel

@using (Html.BeginForm("Upload", "Home",
  FormMethod.Post, new { enctype = "multipart/form-data", @role = "form" }))
{
   <div class="form-group">
    @Html.LabelFor(m => m.File)
    @Html.TextBoxFor(m => m.File, new { type = "file", @class = "form-control" })
    <strong>@Html.ValidationMessageFor(m => m.File, null, new { @class = "label label-danger" })</strong>
</div>

<div class="form-group noleftpadding">
    <input type="submit" value="Upload File" class="btn btn-primary" />
</div>
}

是否有一种简单的方法可以处理浏览器显示的百分比并将其应用到进度条？

Answer 1

ajax进度处理程序可以完成这项工作吗？

function uploadFile(){
    myApp.showPleaseWait(); //show dialog
    var file=document.getElementById('file_name').files[0];
    var formData = new FormData();
    formData.append("file_name", file);
    ajax = new XMLHttpRequest();
    ajax.upload.addEventListener("progress", progressHandler, false);
    ajax.addEventListener("load", completeHandler, false);
    ajax.open("POST", "/to/action");
    ajax.send(formData);
}

function progressHandler(event){
    var percent = (event.loaded / event.total) * 100;
    $('.bar').width(percent); //from bootstrap bar class
}

function completeHandler(){
    myApp.hidePleaseWait(); //hide dialog
    $('.bar').width(100);
}

注意：myApp.showPleaseWait();和myApp.hidePleaseWait();在OP提供的link中定义。

（编辑：formData和formdata以前不一致）

Answer 2

对于那些仍在寻找其他解决方案的人来说，它是：

function showPleaseWait() {

    if (document.querySelector("#pleaseWaitDialog") == null) {
        var modalLoading = '<div class="modal" id="pleaseWaitDialog" data-backdrop="static" data-keyboard="false" role="dialog">\
        <div class="modal-dialog">\
            <div class="modal-content">\
                <div class="modal-header">\
                    <h4 class="modal-title">Please wait...</h4>\
                </div>\
                <div class="modal-body">\
                    <div class="progress">\
                      <div class="progress-bar progress-bar-success progress-bar-striped active" role="progressbar"\
                      aria-valuenow="100" aria-valuemin="0" aria-valuemax="100" style="width:100%; height: 40px">\
                      </div>\
                    </div>\
                </div>\
            </div>\
        </div>\
    </div>';
        $(document.body).append(modalLoading);
    }

    $("#pleaseWaitDialog").modal("show");
}

/**
 * Hides "Please wait" overlay. See function showPleaseWait().
 */
function hidePleaseWait() {
    $("#pleaseWaitDialog").modal("hide");
}
 $('#load').click(function () {
    showPleaseWait();
});

并这样称呼它：

<button id="load">Load It!</button>

如果要隐藏它，请确保在成功后致电hidePleaseWait()。