有人可以解釋如何實現jQuery文件上傳插件嗎?



Answers

我剛剛花了2個小時與jQuery Upload進行對抗,但由於依賴關係太多(我有13個JS文件包含了所有的鈴聲和口哨聲)。

我做了一些更多的搜索,發現了一個名為Dropzone.js的整潔項目,它沒有任何依賴關係。

作者還創建了一個受jQuery File Upload插件啟發的引導程序演示

我希望這能節省一些時間。

Question

編輯:

這似乎仍然是流量,所以我會解釋我最終做了什麼。 我最終通過遵循Subrat的教程獲得了插件,這是可以接受的答案。 然而,jQuery文件上傳是一個真正的麻煩,如果你正在尋找一個簡單的文件上傳插件,我會強烈推薦Uploadify (謝謝​​,CORSAIR!)。 答案指出,它僅供非商業用途使用。

背景

我試圖使用blueimp的jQuery文件上傳來允許用戶上傳文件。 按照設置說明, 開箱即可完美運行 。 但要在我的網站上實際使用它,我希望能夠做幾件事情:

  • 在我現有的任何頁面上添加上傳器
  • 更改上傳文件的目錄

插件的所有文件都位於根目錄下的文件夾中。

我試過了...

  • 將演示頁面移入根目錄並更新必要腳本的路徑
  • 按照here建議更改UploadHandler.php文件中的“upload_dir”和“upload_url”選項。
  • 更改演示javascript第二行中的URL

在所有情況下,預覽顯示,進度條運行,但文件無法上傳,並在控制台中出現此錯誤: Uncaught TypeError: Cannot read property 'files' of undefined 。 我不明白插件的所有部分是如何工作的,這使得它很難調試。

演示頁面中的JavaScript:

$(function () {
'use strict';
// Change this to the location of your server-side upload handler:
var url = 'file_upload/server/php/UploadHandler.php',
    uploadButton = $('<button/>')
        .addClass('btn')
        .prop('disabled', true)
        .text('Processing...')
        .on('click', function () {
            var $this = $(this),
                data = $this.data();
            $this
                .off('click')
                .text('Abort')
                .on('click', function () {
                    $this.remove();
                    data.abort();
                });
            data.submit().always(function () {
                $this.remove();
            });
        });
$('#fileupload').fileupload({
    url: url,
    dataType: 'json',
    autoUpload: false,
    acceptFileTypes: /(\.|\/)(gif|jpe?g|png)$/i,
    maxFileSize: 5000000, // 5 MB
    // Enable image resizing, except for Android and Opera,
    // which actually support image resizing, but fail to
    // send Blob objects via XHR requests:
    disableImageResize: /Android(?!.*Chrome)|Opera/
        .test(window.navigator.userAgent),
    previewMaxWidth: 100,
    previewMaxHeight: 100,
    previewCrop: true
}).on('fileuploadadd', function (e, data) {
    data.context = $('<div/>').appendTo('#files');
    $.each(data.files, function (index, file) {
        var node = $('<p/>')
                .append($('<span/>').text(file.name));
        if (!index) {
            node
                .append('<br>')
                .append(uploadButton.clone(true).data(data));
        }
        node.appendTo(data.context);
    });
}).on('fileuploadprocessalways', function (e, data) {
    var index = data.index,
        file = data.files[index],
        node = $(data.context.children()[index]);
    if (file.preview) {
        node
            .prepend('<br>')
            .prepend(file.preview);
    }
    if (file.error) {
        node
            .append('<br>')
            .append(file.error);
    }
    if (index + 1 === data.files.length) {
        data.context.find('button')
            .text('Upload')
            .prop('disabled', !!data.files.error);
    }
}).on('fileuploadprogressall', function (e, data) {
    var progress = parseInt(data.loaded / data.total * 100, 10);
    $('#progress .bar').css(
        'width',
        progress + '%'
    );
}).on('fileuploaddone', function (e, data) {
    $.each(data.result.files, function (index, file) {
        var link = $('<a>')
            .attr('target', '_blank')
            .prop('href', file.url);
        $(data.context.children()[index])
            .wrap(link);
    });
}).on('fileuploadfail', function (e, data) {
    $.each(data.result.files, function (index, file) {
        var error = $('<span/>').text(file.error);
        $(data.context.children()[index])
            .append('<br>')
            .append(error);
    });
}).prop('disabled', !$.support.fileInput)
    .parent().addClass($.support.fileInput ? undefined : 'disabled');
});

我對缺乏文檔感到驚訝; 它似乎應該是一個簡單的事情來改變。 如果有人能解釋如何做到這一點,我將不勝感激。




對於UI插件,使用jsp頁面和Spring MVC ..

示例html 。 需要位於具有fileuploadid屬性的表單元素中

    <!-- The fileupload-buttonbar contains buttons to add/delete files and start/cancel the upload -->
<div class="fileupload-buttonbar">
    <div>
        <!-- The fileinput-button span is used to style the file input field as button -->
        <span class="btn btn-success fileinput-button">
            <i class="glyphicon glyphicon-plus"></i>
            <span>Add files</span>
            <input id="fileuploadInput" type="file" name="files[]" multiple>
        </span>
        <%-- https://.com/questions/925334/how-is-the-default-submit-button-on-an-html-form-determined --%>
        <button type="button" class="btn btn-primary start">
            <i class="glyphicon glyphicon-upload"></i>
            <span>Start upload</span>
        </button>
        <button type="reset" class="btn btn-warning cancel">
            <i class="glyphicon glyphicon-ban-circle"></i>
            <span>Cancel upload</span>
        </button>
        <!-- The global file processing state -->
        <span class="fileupload-process"></span>
    </div>
    <!-- The global progress state -->
    <div class="fileupload-progress fade">
        <!-- The global progress bar -->
        <div class="progress progress-striped active" role="progressbar" aria-valuemin="0" aria-valuemax="100">
            <div class="progress-bar progress-bar-success" style="width:0%;"></div>
        </div>
        <!-- The extended global progress state -->
        <div class="progress-extended">&nbsp;</div>
    </div>
</div>
<!-- The table listing the files available for upload/download -->
<table role="presentation" class="table table-striped"><tbody class="files"></tbody></table>

<link rel="stylesheet" type="text/css" href="${pageContext.request.contextPath}/js/jquery-file-upload-9.14.2/css/jquery.fileupload.css">
<link rel="stylesheet" type="text/css" href="${pageContext.request.contextPath}/js/jquery-file-upload-9.14.2/css/jquery.fileupload-ui.css">

<script type="text/javascript" src="${pageContext.request.contextPath}/js/jquery-file-upload-9.14.2/js/vendor/jquery.ui.widget.js"></script>
<script type="text/javascript" src="${pageContext.request.contextPath}/js/jquery-file-upload-9.14.2/js/jquery.iframe-transport.js"></script>
<script type="text/javascript" src="${pageContext.request.contextPath}/js/jquery-file-upload-9.14.2/js/jquery.fileupload.js"></script>
<script type="text/javascript" src="${pageContext.request.contextPath}/js/jquery-file-upload-9.14.2/js/jquery.fileupload-process.js"></script>
<script type="text/javascript" src="${pageContext.request.contextPath}/js/jquery-file-upload-9.14.2/js/jquery.fileupload-validate.js"></script>
<script type="text/javascript" src="${pageContext.request.contextPath}/js/jquery-file-upload-9.14.2/js/jquery.fileupload-ui.js"></script>

<script type="text/javascript">
    $(document).ready(function () {
            var maxFileSizeBytes = ${maxFileSizeBytes};
        if (maxFileSizeBytes < 0) {
            //-1 or any negative value means no size limit
            //set to undefined
            //https://.com/questions/5795936/how-to-set-a-javascript-var-as-undefined
            maxFileSizeBytes = void 0;
        }

        //https://github.com/blueimp/jQuery-File-Upload/wiki/Options
        //https://.com/questions/34063348/jquery-file-upload-basic-plus-ui-and-i18n
        //https://.com/questions/11337897/how-to-customize-upload-download-template-of-blueimp-jquery-file-upload
        $('#fileupload').fileupload({
            url: '${pageContext.request.contextPath}/app/uploadResources.do',
            fileInput: $('#fileuploadInput'),
            acceptFileTypes: /(\.|\/)(jrxml|png|jpe?g)$/i,
            maxFileSize: maxFileSizeBytes,
            messages: {
                acceptFileTypes: '${fileTypeNotAllowedText}',
                maxFileSize: '${fileTooLargeMBText}'
            },
            filesContainer: $('.files'),
            uploadTemplateId: null,
            downloadTemplateId: null,
            uploadTemplate: function (o) {
                var rows = $();
                $.each(o.files, function (index, file) {
                    var row = $('<tr class="template-upload fade">' +
                            '<td><p class="name"></p>' +
                            '<strong class="error text-danger"></strong>' +
                            '</td>' +
                            '<td><p class="size"></p>' +
                            '<div class="progress progress-striped active" role="progressbar" aria-valuemin="0" aria-valuemax="100" aria-valuenow="0">' +
                            '<div class="progress-bar progress-bar-success" style="width:0%;"></div></div>' +
                            '</td>' +
                            '<td>' +
                            (!index && !o.options.autoUpload ?
                                    '<button class="btn btn-primary start" disabled>' +
                                    '<i class="glyphicon glyphicon-upload"></i> ' +
                                    '<span>${startText}</span>' +
                                    '</button>' : '') +
                            (!index ? '<button class="btn btn-warning cancel">' +
                                    '<i class="glyphicon glyphicon-ban-circle"></i> ' +
                                    '<span>${cancelText}</span>' +
                                    '</button>' : '') +
                            '</td>' +
                            '</tr>');
                    row.find('.name').text(file.name);
                    row.find('.size').text(o.formatFileSize(file.size));
                    if (file.error) {
                        row.find('.error').text(file.error);
                    }
                    rows = rows.add(row);
                });
                return rows;
            },
            downloadTemplate: function (o) {
                var rows = $();
                $.each(o.files, function (index, file) {
                    var row = $('<tr class="template-download fade">' +
                            '<td><p class="name"></p>' +
                            (file.error ? '<strong class="error text-danger"></strong>' : '') +
                            '</td>' +
                            '<td><span class="size"></span></td>' +
                            '<td>' +
                            (file.deleteUrl ? '<button class="btn btn-danger delete">' +
                                    '<i class="glyphicon glyphicon-trash"></i> ' +
                                    '<span>${deleteText}</span>' +
                                    '</button>' : '') +
                            '<button class="btn btn-warning cancel">' +
                            '<i class="glyphicon glyphicon-ban-circle"></i> ' +
                            '<span>${clearText}</span>' +
                            '</button>' +
                            '</td>' +
                            '</tr>');
                    row.find('.name').text(file.name);
                    row.find('.size').text(o.formatFileSize(file.size));
                    if (file.error) {
                        row.find('.error').text(file.error);
                    }
                    if (file.deleteUrl) {
                        row.find('button.delete')
                                .attr('data-type', file.deleteType)
                                .attr('data-url', file.deleteUrl);
                    }
                    rows = rows.add(row);
                });
                return rows;
            }
        });

    });
</script>

樣本上傳和刪除請求處理程序

    @PostMapping("/app/uploadResources")
public @ResponseBody
Map<String, List<FileUploadResponse>> uploadResources(MultipartHttpServletRequest request,
        Locale locale) {
    //https://github.com/jdmr/fileUpload/blob/master/src/main/java/org/davidmendoza/fileUpload/web/ImageController.java
    //https://github.com/blueimp/jQuery-File-Upload/wiki/Setup#using-jquery-file-upload-ui-version-with-a-custom-server-side-upload-handler
    Map<String, List<FileUploadResponse>> response = new HashMap<>();
    List<FileUploadResponse> fileList = new ArrayList<>();

    String deleteUrlBase = request.getContextPath() + "/app/deleteResources.do?filename=";

    //http://docs.spring.io/spring/docs/current/javadoc-api/org/springframework/web/multipart/MultipartRequest.html
    Iterator<String> itr = request.getFileNames();
    while (itr.hasNext()) {
        String htmlParamName = itr.next();
        MultipartFile file = request.getFile(htmlParamName);
        FileUploadResponse fileDetails = new FileUploadResponse();
        String filename = file.getOriginalFilename();
        fileDetails.setName(filename);
        fileDetails.setSize(file.getSize());
        try {
            String message = saveFile(file);
            if (message != null) {
                String errorMessage = messageSource.getMessage(message, null, locale);
                fileDetails.setError(errorMessage);
            } else {
                //save successful
                String encodedFilename = URLEncoder.encode(filename, "UTF-8");
                String deleteUrl = deleteUrlBase + encodedFilename;
                fileDetails.setDeleteUrl(deleteUrl);
            }
        } catch (IOException ex) {
            logger.error("Error", ex);
            fileDetails.setError(ex.getMessage());
        }

        fileList.add(fileDetails);
    }

    response.put("files", fileList);

    return response;
}

@PostMapping("/app/deleteResources")
public @ResponseBody
Map<String, List<Map<String, Boolean>>> deleteResources(@RequestParam("filename") List<String> filenames) {
    Map<String, List<Map<String, Boolean>>> response = new HashMap<>();
    List<Map<String, Boolean>> fileList = new ArrayList<>();

    String templatesPath = Config.getTemplatesPath();
    for (String filename : filenames) {
        Map<String, Boolean> fileDetails = new HashMap<>();

        String cleanFilename = ArtUtils.cleanFileName(filename);
        String filePath = templatesPath + cleanFilename;

        File file = new File(filePath);
        boolean deleted = file.delete();

        if (deleted) {
            fileDetails.put(cleanFilename, true);
        } else {
            fileDetails.put(cleanFilename, false);
        }

        fileList.add(fileDetails);
    }

    response.put("files", fileList);

    return response;
}

用於生成所需json響應的樣本類

    public class FileUploadResponse {
    //https://github.com/blueimp/jQuery-File-Upload/wiki/Setup#using-jquery-file-upload-ui-version-with-a-custom-server-side-upload-handler

    private String name;
    private long size;
    private String error;
    private String deleteType = "POST";
    private String deleteUrl;

    /**
     * @return the name
     */
    public String getName() {
        return name;
    }

    /**
     * @param name the name to set
     */
    public void setName(String name) {
        this.name = name;
    }

    /**
     * @return the size
     */
    public long getSize() {
        return size;
    }

    /**
     * @param size the size to set
     */
    public void setSize(long size) {
        this.size = size;
    }

    /**
     * @return the error
     */
    public String getError() {
        return error;
    }

    /**
     * @param error the error to set
     */
    public void setError(String error) {
        this.error = error;
    }

    /**
     * @return the deleteType
     */
    public String getDeleteType() {
        return deleteType;
    }

    /**
     * @param deleteType the deleteType to set
     */
    public void setDeleteType(String deleteType) {
        this.deleteType = deleteType;
    }

    /**
     * @return the deleteUrl
     */
    public String getDeleteUrl() {
        return deleteUrl;
    }

    /**
     * @param deleteUrl the deleteUrl to set
     */
    public void setDeleteUrl(String deleteUrl) {
        this.deleteUrl = deleteUrl;
    }

}

請參閱https://pitipata.blogspot.co.ke/2017/01/using-jquery-file-upload-ui.html




你可以使用uploadify這是我用過的最好的multiupload jquery插件。

實現很簡單,瀏覽器的支持是完美的。




使用dropper jquery插件檢查圖像拖放上傳器的圖像預覽。

HTML

<div class="target" width="78" height="100"><img /></div>

JS

$(".target").dropper({
    action: "upload.php",

}).on("start.dropper", onStart);
function onStart(e, files){
console.log(files[0]);

    image_preview(files[0].file).then(function(res){
$('.dropper-dropzone').empty();
//$('.dropper-dropzone').css("background-image",res.data);
 $('#imgPreview').remove();        
$('.dropper-dropzone').append('<img id="imgPreview"/><span style="display:none">Drag and drop files or click to select</span>');
var widthImg=$('.dropper-dropzone').attr('width');
        $('#imgPreview').attr({width:widthImg});
    $('#imgPreview').attr({src:res.data});

    })

}

function image_preview(file){
    var def = new $.Deferred();
    var imgURL = '';
    if (file.type.match('image.*')) {
        //create object url support
        var URL = window.URL || window.webkitURL;
        if (URL !== undefined) {
            imgURL = URL.createObjectURL(file);
            URL.revokeObjectURL(file);
            def.resolve({status: 200, message: 'OK', data:imgURL, error: {}});
        }
        //file reader support
        else if(window.File && window.FileReader)
        {
            var reader = new FileReader();
            reader.readAsDataURL(file);
            reader.onloadend = function () {
                imgURL = reader.result;
                def.resolve({status: 200, message: 'OK', data:imgURL, error: {}});
            }
        }
        else {
            def.reject({status: 1001, message: 'File uploader not supported', data:imgURL, error: {}});
        }
    }
    else
        def.reject({status: 1002, message: 'File type not supported', error: {}});
    return def.promise();
}

$('.dropper-dropzone').mouseenter(function() {
 $( '.dropper-dropzone>span' ).css("display", "block");
});

$('.dropper-dropzone').mouseleave(function() {
 $( '.dropper-dropzone>span' ).css("display", "none");
});

CSS

.dropper-dropzone{
    width:78px;
padding:3px;
    height:100px;
position: relative;
}
.dropper-dropzone>img{
    width:78px;
    height:100px;
margin-top=0;
}

.dropper-dropzone>span {
    position: absolute;
    right: 10px;
    top: 20px;
color:#ccc;


}

.dropper .dropper-dropzone{

padding:3px !important    
}

演示Jsfiddle




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