js实现多文件上传

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少说点话 2022-05-25 12:52:01 博主文章分类：前端 ©著作权

文章标签 html javascript jquery 文章分类 Java 后端开发

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<html>
<head>
    <title>Title</title>
    <script type="text/javascript" src="C:\Users\itw0001\Desktop\\jquery-3.4.1.min.js"></script>
</head>
<body>
<form enctype="multipart/form-data" id="form_example">
    <input type="file" id="file" multiple/><br/><br/>
    <input type="submit" value="提交"/>
</form>
 
<div id='file-list-display'></div>
</body>
</html>
<script type="text/javascript">
    $(document).ready(function () {
        var fileList = [];
        var fileCatcher = document.getElementById('form_example');
        var files = document.getElementById("file"), renderFileList;
        var fileListDisplay = document.getElementById('file-list-display'), sendFile;
 
        fileCatcher.addEventListener("submit", function (event) {
            event.preventDefault();
            //上传文件
            sendFile();
        });
 
        files.addEventListener("change", function (event) {
            console.log(file.files)
            for (var i = 0; i < files.files.length; i++) {
                fileList.push(files.files[i]);
            }
            renderFileList();
        });
 
        renderFileList = function () {
            fileListDisplay.innerHTML = '';
            fileList.forEach(function (file, index) {
                var fileDisplayEl = document.createElement("p");
                fileDisplayEl.innerHTML = (index + 1) + ":" + file.name;
                fileListDisplay.appendChild(fileDisplayEl);
            })
        };
 
        sendFile = function () {
            var formData = new FormData();
            var request = new XMLHttpRequest();
            //循环添加到formData中
            fileList.forEach(function (file) {
                formData.append('file', file, file.name);
            })
            request.open("POST", "http://***********/***");
            request.send(formData);
        }
    })
</script>