没有AJAX的拖放文件上传，在前台同步？

I have a web site with a regular <input type="file"> file upload, POSTing the data to the backend when the form is submitted.

我有一个带有常规文件上传的网站,在提交表单时将数据发布到后端。

I would like to progressively enhance the form so that you can drop a file from outside the browser anywhere in the viewport (not just on the file input field, as built into some browsers) to upload it.

我想逐步增强表单,以便您可以从浏览器外的任何位置删除文件(不仅仅是在文件输入字段中,内置到某些浏览器中)来上传它。

Whether or not the form autosubmits isn't important. So if the drag-and-drop only selects the file in the file field, without starting an upload, that's fine. I don't need support for multiple files. I don't need to show upload progress, thumbnails or anything fancy.

表单自动提交是否不重要。因此,如果拖放只选择文件字段中的文件,而不开始上传,那就没问题。我不需要支持多个文件。我不需要显示上传进度,缩略图或任何花哨的东西。

I know there are JS libs that support drag-and-drop uploads, but they all seem to upload via AJAX. I could do that, but then I would need to modify the backend and frontend to handle upload errors, redirect and show the right messages on success and so on.

我知道有JS库支持拖放上传,但它们似乎都是通过AJAX上传的。我可以这样做,但后来我需要修改后端和前端来处理上传错误,重定向并在成功时显示正确的消息,等等。

I want a progressive enhancement that doesn't require any backend changes. It should happen synchronously using the form in the page. JS is fine, as long as the upload happens "in the foreground". Synchronous AJAX would not work, of course.

我想要一个不需要任何后端更改的渐进增强功能。它应该使用页面中的表单同步发生。 JS很好,只要上传发生在“前台”。当然,同步AJAX不起作用。

3 个解决方案

#1

Although not really "synchronous" (JavaScript execution won't actually halt), you can set the files selected by <input type="file"> programatically. In fact, such elements and dragging share their file backend implementation (File and FileList instances), so it's really straight-forward. What's more, due to both frontends using FileLists, dragging multiple files work just as seamlessly.

虽然不是真正的“同步”(JavaScript执行实际上不会停止),但您可以通过编程方式设置选择的文件。实际上,这些元素和拖动共享它们的文件后端实现(File和FileList实例),所以它非常简单。更重要的是,由于前端使用FileLists,拖动多个文件的工作方式同样无缝。

This works in Chrome (using jQuery): http://jsfiddle.net/qMmPr/.

这适用于Chrome(使用jQuery):http://jsfiddle.net/qMmPr/。

$(document).on("dragover drop", function(e) {
    e.preventDefault();  // allow dropping and don't navigate to file on drop
}).on("drop", function(e) {
    $("input[type='file']")
        .prop("files", e.originalEvent.dataTransfer.files)  // put files into element
        .closest("form")
          .submit();  // autosubmit as well
});

3 个解决方案

#1

更多相关文章

随机推荐