需要什么样的事件处理程序?
Drag'n'drop 需要 HTML5 浏览器 - 但现在几乎就是所有这些了。
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
在文档中用 div 类定义一个元素后,您可以初始化它以接受丢弃的文件:
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
});
接受上传的网页部分有这个HTML。
<div class='fileDrop'>
Upload a file by dragging it.
<span id='fileDropTarget'/>
</div>
文件放置在外部
上工作,但最好制作一个漂亮的大目标,上面写着“DROP HERE”,这样用户就不会对他们需要放置文件的位置感到困惑。