如何在grails 3中异步上传文件

Question

我是 grails 框架的新手，我遇到了以下问题：

我想上传包含文件和一些详细信息（如标题、说明）的项目，并且我有非常大的 stl 3d 文件。虽然文件上传需要时间，但我希望用户进入下一页并填写项目的其余详细信息，如标题描述等。

我不知道我将如何做到这一点..我看过 grails ynch 编程，但我不知道如何实现它。

如果有人对此提供指导，我将不胜感激

Answer 1

前段时间我制作了一个包含文件上传的表单，我希望它可以异步完成。这花了很多谷歌搜索，不幸的是我不记得我使用过的任何参考资料，但这就是我最终所做的。

I included an onchange attribute on the file input that, when a file was selected, would call a javascript function to validate and upload the file asynchronously.

文件输入：

<input type="file" name="uploadMedical" id="uploadMedical" onchange="validateAndUpload(this, $(this));" accept=".pdf,.jpg,.jpeg" multiple>

JavaScript （我已尽力去除与您的问题无关的代码，但仍留下足够的代码来帮助解决您的问题）：

function validateAndUpload(input, documentInput){
    var uploadForm = $("#uploadForm");

    // Stop the browser from submitting the form.
    uploadForm.submit(function(event) {
        event.preventDefault();
    });

    // Get the selected files from the input.
    var files = input.files;

    // Create a new FormData object.
    var formData = new FormData();

    // Loop through each of the selected files.
    for (var ii = 0; ii < files.length; ii++) {
        var file = files[ii];

        // Add the file to the request.
        formData.append('supportingDocumentation', file, file.name);
    }

    //Include ID of record to associate this upload with
    formData.append('id', getAppealId());

    // Submit the form using AJAX.
    $.ajax({
        type: 'POST',
        dataType : "html",
        url: url_str,
        data: formData,
        processData: false,
        contentType: false,
         beforeSend:function(){
            //indicate that the file is uploading
        },
        success:function(htmlData){
            //display the new list of files on the page
        },
        error:function(ee){
            //indicate that the upload failed
        },
        complete:function(){
            //reset the file input so more files can be uploaded
        }
    })
}

如何在grails 3中异步上传文件

How to upload file asynchronously in grails 3

multithreading

grails-controller

grails-3.0

asynccontroller