H5圖片上傳插件

時間 2019-11-18

標籤 h5 圖片上傳插件简体版

原文原文鏈接

基於zepto，支持多文件上傳，進度和圖片預覽，用於手機端。css

(function ($) {
    $.extend($, {
        fileUpload: function (options) {
            var para = {
                multiple: true,
                filebutton: ".filePicker",
                uploadButton: null,
                url: "/home/MUploadImg",
                filebase: "mfile",//mvc後臺須要對應的名稱
                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文件的上傳進度，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 = "";  // 設置多選的參數
            para.multiple ? multiple = "multiple" : multiple = "";

$self.css('position', 'relative');
$self.append('<input id="fileImage" style="opacity:0;position:absolute;top: 0;left: 0;width:100%;height:100%" type="file" size="30" name="fileselect[]" ' + multiple + '>');html

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 + "個文件");
                    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("選中了文件");
                core.fileSelected();
            });

            console.log("初始化!");
            //綁定事件

            $(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：上傳仍是得靠file元素，因此一開始就加了個隱藏的,簡單隱藏會有一些問題，有時候不能觸發file change事件。因此用了透明度,將父類設置爲相對位置。而後經過file的change事件得到須要上傳的文件並放入formdata中，再使用xmlHttpRequest發請求。進度條是直接綁定的process事件。文件預覽是filereader，另外須要注意的就是filebase參數，對應的是MVC後臺上傳方法的參數的名稱，若是不一致，後臺將獲取不到file。回調函數就不說了。css3

      [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 = "文件格式不對！" }, 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);// 原始文件名稱
                string fileExtension = Path.GetExtension(fileName); // 文件擴展名
                //string saveName = Guid.NewGuid() + fileExtension; // 保存文件名稱 這是個好方法。
                string saveName = Encrypt.GenerateOrderNumber() + fileExtension; // 保存文件名稱 這是個好方法。
                file.SaveAs(uploadpath + saveName);

                return Json(new { Success = true, SaveName = path + saveName });
            }
            return Json(new { Success = false, Message = "請選擇要上傳的文件！" }, JsonRequestBehavior.AllowGet);

        }

View Code

調用：mvc

    <div class="page" id="upload">
        <h2>UploadImg</h2>
        <div id="dd" class="filePicker">點擊選擇文件</div>
        <div id="preview"></div>

    </div>
    <script>
        $.fileUpload({ filebutton: "#dd", previewZoom: "#preview" });
    </script>