H5圖片上傳外掛
阿新 • • 發佈:2019-01-02
基於zepto,支援多檔案上傳,進度和圖片預覽,用於手機端。
(function ($) { $.extend($, { fileUpload: function (options) { var para = { multiple: true, filebutton: ".filePicker", uploadButton: null, url: "/home/MUploadImg", filebase:"mfile",//mvc後臺需要對應的名稱 auto: true, previewZoom: null, uploadComplete: function (res) { console.log("uploadComplete", res); }, uploadError: function (err) { console.log("uploadError", err); }, onProgress:function (percent) { // 提供給外部獲取單個檔案的上傳進度,供外部實現上傳進度效果 console.log(percent); }, }; para = $.extend(para, options); var $self = $(para.filebutton); //先加入一個file元素 var multiple = ""; // 設定多選的引數 para.multiple ? multiple = "multiple" : multiple = ""; $self.parent().append('<input id="fileImage" style="display:none" type="file" size="30" name="fileselect[]" ' + multiple + '>'); var doms = { "fileToUpload": $self.parent().find("#fileImage"), // "thumb": $self.find(".thumb"), // "progress": $self.find(".upload-progress") }; var core = { fileSelected: function () { var files = (doms.fileToUpload)[0].files; var count = files.length; console.log("共有" + count + "個檔案"); for (var i = 0; i < count; i++) { var item = files[i]; console.log(item.size); if (para.auto) { core.uploadFile(item); } core.previewImage(item); } }, uploadFile: function (file) { console.log("開始上傳"); var formdata = new FormData(); formdata.append(para.filebase, file);//這個名字要和mvc後臺配合 var xhr = new XMLHttpRequest(); xhr.upload.addEventListener("progress", function (e) { var percentComplete = Math.round(e.loaded * 100 / e.total); para.onProgress(percentComplete.toString() + '%'); }); xhr.addEventListener("load", function (e) { para.uploadComplete(xhr.responseText); }); xhr.addEventListener("error", function (e) { para.uploadError(e); }); xhr.open("post", para.url, true); //xhr.setRequestHeader("X_FILENAME", file.name); xhr.send(formdata); }, uploadFiles: function () { var files = (doms.fileToUpload)[0].files; for (var i = 0; i < files.length; i++) { core.uploadFile(files[i]); } }, previewImage: function (file) { if (!para.previewZoom) return; var img = document.createElement("img"); img.file = file; $(para.previewZoom).append(img); // 使用FileReader方法顯示圖片內容 var reader = new FileReader(); reader.onload = (function (aImg) { return function (e) { aImg.src = e.target.result; }; })(img); reader.readAsDataURL(file); } } doms.fileToUpload.on("change", function () { //doms.progress.find("span").width("0"); console.log("選中了檔案"); core.fileSelected(); }); console.log("初始化!"); //繫結事件 $(document).on("click", para.filebutton, function () { console.log("clicked"); doms.fileToUpload.click(); }); if (para.uploadButton) { $(document).on("click", para.uploadButton, function () { core.uploadFiles(); }); } } }); })(Zepto);
簡單講解:上傳還是得靠file元素,所以一開始就加了個隱藏的。然後通過file的change事件獲得需要上傳的檔案並放入formdata中,再使用xmlHttpRequest發請求。進度條是直接繫結的process事件。檔案預覽是filereader,另外需要注意的就是filebase引數,對應的是MVC後臺上傳方法的引數的名稱,如果不一致,後臺將獲取不到file。回撥函式就不說了。
[HttpPost] public ActionResult MUploadImg(HttpPostedFileBase mfile) { return UploadImg(mfile, "Mobile"); }
[HttpPost] public ActionResult UploadImg(HttpPostedFileBase file, string dir = "UserImg") { if (CheckImg(file, imgtypes) != "ok") return Json(new { Success = false, Message = "檔案格式不對!" }, JsonRequestBehavior.AllowGet); if (file != null) { var path = "~/Content/UploadFiles/" + dir + "/"; var uploadpath = Server.MapPath(path); if (!Directory.Exists(uploadpath)) { Directory.CreateDirectory(uploadpath); } string fileName = Path.GetFileName(file.FileName);// 原始檔名稱 string fileExtension = Path.GetExtension(fileName); // 副檔名 //string saveName = Guid.NewGuid() + fileExtension; // 儲存檔名稱 這是個好方法。 string saveName = Encrypt.GenerateOrderNumber() + fileExtension; // 儲存檔名稱 這是個好方法。 file.SaveAs(uploadpath + saveName); return Json(new { Success = true, SaveName = path + saveName }); } return Json(new { Success = false, Message = "請選擇要上傳的檔案!" }, JsonRequestBehavior.AllowGet); }
呼叫:
<div class="page" id="upload"> <h2>UploadImg</h2> <div id="dd" class="filePicker">點選選擇檔案</div> <div id="preview"></div> </div> <script> $.fileUpload({ filebutton: "#dd", previewZoom: "#preview" }); </script>
擴充套件到$物件而不擴充套件到$.fn,是因為zepto中繫結事件的時候後者不方便,傳遞id或樣式名容易繫結。手機端可以自動的調出相機和相簿。預設是不預覽的圖片的,需要制定預覽區域,進度條需要自己寫樣式,只返回了進度值。
同時傳2張的效果:
參考了兩篇部落格:
http://www.cnblogs.com/hutuzhu/p/5254532.html
http://www.lanrenzhijia.com/js/css3/2864.html