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Ajax實現上傳圖像功能的示例詳解
瀏覽：239日期：2022-06-12 09:41:49
最終效果展示
xhr發起請求
<!DOCTYPE html><html lang="en"> <head> <meta charset="UTF-8"> <meta http-equiv="X-UA-Compatible" content="IE=edge"> <meta name="viewport" content="width=device-width, initial-scale=1.0"> <title>Document</title> <link rel="stylesheet" rel="external nofollow" > <script src="https://cdn.staticfile.org/jquery/2.1.1/jquery.min.js"></script> <script src="https://cdn.staticfile.org/twitter-bootstrap/3.3.7/js/bootstrap.min.js"></script></head> <body> <!--1、文件選擇框 --> <input type="file" id="file1"> <!-- 2、上傳文件的按鈕 --> <button id="btnupload">上傳文件</button> <br/> <div><div id="precent"> 0%</div> </div> <!-- 3、img標簽 來顯示上傳成功以后的圖片 --> <img id="img" width="800"> <script> var precent = document.querySelector("#precent")var btnupload = document.querySelector("#btnupload")btnupload.addEventListener("click", function() { var files = document.querySelector("#file1").files if (files.length <= 0) {return alert("請選擇要上傳的文件") } var fd = new FormData() fd.append("avatar", files[0]) var xhr = new XMLHttpRequest() xhr.upload.onprogress = function(e) {console.log(e);if (e.lengthComputable) { var h = Math.ceil((e.loaded / e.total) * 100) precent.style.width = h + "%" precent.innerHTML = h + "%" console.log(h);} } xhr.upload.onload = function() {$("#precent").removeClass().addClass("progress-bar progress-bar-success") } xhr.open("post", "http://www.liulongbin.top:3006/api/upload/avatar") xhr.send(fd) xhr.onreadystatechange = function() {if (xhr.readyState == 4 && xhr.status == 200) { var data = JSON.parse(xhr.responseText) console.log(data); if (data.status == 200) {console.log("上傳成功");document.querySelector("#img").src = "http://www.liulongbin.top:3006" + data.url } else {console.log("上傳失敗"); }} }}) </script></body> </html>ajax發起請求
<!DOCTYPE html><html lang="en"> <head> <meta charset="UTF-8"> <meta http-equiv="X-UA-Compatible" content="IE=edge"> <meta name="viewport" content="width=device-width, initial-scale=1.0"> <title>Document</title> <script src="jquery.js"></script> <style>img { width: 50px; height: 50px; display: none;} </style></head> <body> <input type="file" id="file1"> <button id="btnupload">上傳文件</button> </br> <img src="5-121204193R5-50.gif" id="loading"> <script>$(function() { $(document).ajaxStart(function() {$("#loading").show() }) $(document).ajaxStop(function() {$("#loading").hide() }) $("#btnupload").on("click", function() {var files = $("#file1")[0].filesif (files.length <= 0) { alert("請選擇文件")}console.log("ok");var fd = new FormData()fd.append("avatar", files[0])$.ajax({ method: "POST", url: "http://www.liulongbin.top:3006/api/upload/avatar", data: fd, processData: false, contentType: false, success: function(res) {console.log(res); }}) }) }) </script></body> </html>到此這篇關于Ajax實現上傳圖像功能的示例詳解的文章就介紹到這了,更多相關Ajax上傳圖像內容請搜索以前的文章或繼續瀏覽下面的相關文章希望大家以后多多支持！
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