jQuery拖放图像上传功能

Question

我试图通过jQuery编写我自己的简单AJAX图像上传脚本.我找到了一些插件,但它们太过于根据需要进行定制,我无法让它们正常工作.

我只是想以某种方式检测用户何时将图像拖放到页面上.从那里我确定上传那些数据并进入/ cache /目录并允许更多选项并不困难.

但是现在我完全陷入了拖放功能.字面上不知道我应该如何处理这个问题.需要什么样的事件处理程序？我是否需要自定义自己的事件处理程序代码？任何建议都不仅仅是值得赞赏的

Answer 1

需要什么样的事件处理程序？

Drag'n'drop需要一个HTML5浏览器 - 但现在几乎所有这些都是.

我建议不要从头开始,因为需要相当多的代码 - 我非常喜欢这个将它实现为jQuery插件的包装器.

http://www.github.com/weixiyen/jquery-filedrop

使用类div在文档中定义元素后,可以初始化它以接受删除的文件:

function fileSetUploadPercent(percent, divID){

    var uploadString = "Uploaded " + percent + " %";

    $('#'.divID).text(uploadString);
}
function fileUploadStarted(index, file, files_count){

    var divID = getDivID(index, file);

    createFileUploadDiv(divID);     //create the div that will hold the upload status

    fileSetUploadPercent(0, divID); //set the upload status to be 0
}

function  fileUploadUpdate(index, file, currentProgress){

    //Logger.log("fileUploadUpdate(index, file, currentProgress)");

    var string = "index = " + index + " Uploading file " + file.fileName + " size is " + file.fileSize + " Progress = " + currentProgress;
    $('#status').text(string);

    var divID = getDivID(index, file);
    fileSetUploadPercent(currentProgress, divID);
}

function fileUploadFinished(index, file, json, timeDiff){

    var divID = getDivID(index, file);
    fileSetUploadPercent(100, divID);

    if(json.status == "OK"){
        createThumbnailDiv(index, file, json.url, json.thumbnailURL);
    }
}



function    fileDocOver(event){
    $('#fileDropTarget').css('border', '2px dashed #000000').text("Drop files here");
}
$(".fileDrop").filedrop({

            fallback_id: 'fallbackFileDrop',
            url: '/api/upload.php',
            //    refresh: 1000,
            paramname: 'fileUpload',
            //    maxfiles: 25,           // Ignored if queuefiles is set > 0
            maxfilesize: 4,         // MB file size limit
            //    queuefiles: 0,          // Max files before queueing (for large volume uploads)
            //    queuewait: 200,         // Queue wait time if full
            //    data: {},
            //    headers: {},
            //    drop: empty,
            //    dragEnter: empty,
            //    dragOver: empty,
            //    dragLeave: empty,
            //    docEnter: empty,
            docOver: fileDocOver,
        //  docLeave: fileDocLeave,
            //  beforeEach: empty,
            //   afterAll: empty,
            //  rename: empty,
            //  error: function(err, file, i) {
            //    alert(err);
            //  },
            uploadStarted: fileUploadStarted,
            uploadFinished: fileUploadFinished,
            progressUpdated: fileUploadUpdate,
            //     speedUpdated
        });

接受上传的网页位有此HTML.

<div class='fileDrop'>
Upload a file by dragging it.
<span id='fileDropTarget'/>

</div>

文件放置在外部<div>上工作但是很高兴做一个漂亮的大目标,即"DROP HERE",这样用户就不会对丢弃文件的位置感到困惑.